Is300 misfire under load. Normal driving no issues.
Is300 misfire under load 2000 LX470 Missing Under Load on Cold Start Only By Mattman615, September 1, 2020 misfire; cold start (and 2 more) Tagged with: 01 - 06 Lexus IS300 ; Random misfire cylinders 1-5 Theme . literally like no power under load I cant speed up hardly to get around someone now. Dan Siegel · Started 15 hours ago. 6 (Default) IPB 4. is300 is300 engine lexus misfire rough idle Jump to Latest 13K views 18 replies 7 participants last post by 01 SolarYellow Jul 7, 2022 2004 m3, did a full rebuild last year, and up until this point I've had no issues. 03' Black Onyx IS300 5SPD w/ LSD Yes the RA-10 is installed now. my 02 is misfiring on all cylinders after a timing and vvti rebuild. There aren’t usually any drivability issues associated with P0174. this old xs XS650 Enthusiast. to Lexus IS Enthusiasts. this happens Hello, I recently purchased a 383 stroker. I turn the truck off, allow it to sit for a few minutes, whip out the code scanner, only code that was there happens to be P0300. I also replaced spark plugs and valve cover gasket. i then switched the coil packs and drove. Slowly a cylinder 1 misfire has developed, but strangely it's only under certain load. In reading some of the posts here, I see alot of confusion about this subject. Possible code also- Code: 1153 - AF/ sensor bank 2 sensor 1. Check the connectors also. Anywhere out of that mph it runs completely fine. Jump to Latest 39K views 13 replies 7 participants last post by Rhotpursuit Oct 6, 2021. Happy to see the previous owners kept up on oil changes '97 Lada Niva with the GM monopoint system, sometimes runs great sometimes runs shit, misfires at idle/under load, throttle hesitation and bucking when accelerating, also down on power. A month later it comes back and engine runs rough, especially at startup. It gets more pronounced as the motor warms up, and can't seem to maintain speed @ 55 mph. They tested it and everything came back normal. OR. any idea? only less for test, test compression in the cylinder 3 and fuel presure, under load the electrical demand becomes higher and requires more volts to fire the plug. So all within the same fan cycle, I opened the hood, it stopped misfiring, I closed it without latching it, and it began to misfire again immediately, and the second lifted it back up the misfire stopped. No codes. 10. Sent to Micro Center support. As the revs increase the time Misfire DTCs Service Category Engine/Hybrid System MarketEngine Mechanical USASection 2019 GS300 VDS(s): BA1BL 2018 - 2020 IS300, NX300, RC300 VDS(s): AA1D2, AARBZ, AARDZ, BA1D2, BARBZ, DA1D2, DARBZ, GA1D2, GARBZ, GARDZ, HARBZ, HARDZ, JARBZ, JARDZ, SARBZ, SARDZ, YARBZ This repair is covered under the Lexus Powertrain Main issue: Stumbles/hesitates severely under load, especially with high throttle, below about 2-3k rpm (sorry no tach) Surges around 2-3k rpm; Normal power above 2-3k rpm; Car was left sitting for 6 months between problem starting and me getting it; Engine codes (KOEO 111 - normal, KOER 412 & 413 - idle low & idle high) Running 83lb holley injectors using a 6al box for the coil. I did a compression test and all cylinders are On start up, the car is throwing a Multiple cyl misfire, a random cyl misfire and a 1,2,3,4,6 cyl misfre(it wont throw the code right away, if i clear the ecu it takes about 5 cold starts) '02 Lexus IS300 MSM 5AT LSD - RIP '08 Chevy Silverado 4x4 LS2 Swap - SOLD '13 Subaru BRZ Limited 6 Spd - SOLD '11 Mercedes-Benz E350 Black - SOLD It ran great for a year, then just started to kind of drop power and misfire under load. E. Skip to main content. same 303 code again. If not, a local Lexus specialist can give you some options on repairing the cause of the misfire if it is caused by carbon buildup. Yesterday I had a misfire show up in cylinder 1 and others across the board. The truck will buck (misfire) when little to no throttle was applyed. 1251 posts · Joined 2009 Add to quote; Only show this user #1 · Sep 4, 2018. Tags leak load misfire oil. At some point a while back the car went into limp mode for a hot second and threw misfire codes for all cylinders BUT 4, along with 29F1, 2FBE and 2AAF. sec. 2004 GMC Sierra 2500 HD, 227,000 miles 6. PCM Diagnostics & Tuning - Bad misfire under load after warmup - I've been chasing a misfire for awhile now and need some more assistance please. 2610 posts · Joined 2009 Add to quote; Only show this user #1 · Sep 21, 2012. 5k for a few miles. 01 stock is 300 p0300 p0301 p0303 p0305 misfire codes please help detailed path I’ve taken so far in comments . Cylinder 1 misfire under load. Was hoping to throw a code but none. It would noticeably misfire, like stumble and back fire real bad as if it was out of gas (I just put in 1/2 a tank of gas yesterday). Typically, the first sign that anything is wrong is the check engine light. 53 g/rev. Often called the right side. With 245k on the coils I'd say you are way overdue. The problem with Lexus IS 300 P0174: Symptoms. Full Forum Listing. The only original parts in the engine bay are the inlet manifold, wiring loom and ECU. Would start and idle just fine, but would misfire under anything but a very moderate acceleration. 0 ZJ. Reactions: Adamc, JOHNDADDY, jaybar6 and 3 others. and #6 sit under the packs. It is a 540 BBC 13:1 on pump E85 IS300 help. It's got the 2. I know the following about the motor / set up: 383 stroker Scat crank Scat rods Hyper pistons Approx. After double checking all connections under the hood again (found one vacuum hose that wasn't connected, corrected that) and letting it run a bit more, P0303 decided to join the party. so I purchased a good quality code It's a safety mode the ECU goes into to protect the motor from further damage. Sort by Oldest first Oldest first Newest first Most reactions. Sep 20, 2024 #12 The full throttle miss is still there, but only just. Going down the electrical road,as mentioned above, the coil can break down under load if its faulty. I have been having issues with misfires under load and lack of power. P0306 - Cylinder misfire in cylinders 2, 4 and 6. Your subject line says misfire under light load, that's a classic symptom of a bad coil. C. When the check engine light came back on, it still gave misfire codes on all cylinders apart from cylinder 4 and lean codes. Joined I have a 2004 Hyundia Elantra gls that I'm an getting a misfire issue from. Idle is fine, running under load is fine. I have checked for fuel pressure (load and under load), replaced spark plugs OEM and swapped ignition coils (Denso) just for a test purpose and that did not fix anything so I installed the original back on the vehicle. I used NAPA Echlin part ECH MP833, which is the replacement for MOPAR part #56027023. so after getting the ignition misfire issue cleared for the most part after the cam install I drove the car and for an hour -90 min around town all was fine then i started feeling a sputtering like i was running out of fuel. Bank 1 the difficult side where the intake body is. I can just feel a slight misfire cruising down the motorway but it wont accelerate on the motorway as it should. It doesn't currently have the front facing camera mounted on the 01 is300 misfire, throttle bogging, and random shutdowns . Maybe plugs/wires/coil pack. Any I'm making this thread to help people and to seek help, as I've seen a few threads on this. Explore Our Forums. It has CSEFI. I thought I had the problem fixed, but I didn't. I fixed the hose, and it ran good again. Whenever I press my brakes fully down all cylinders start to misfire. then misfire same 303 code. O2 sensor light so replaced it The car Idles fine and I can hold it at 2500 rpm with no sputters or misfires. However I cant accelerate worth a **** due to this misfire/stumble/no power issue. It dynoed about 650hp at the tire and it does not feel anywhere close to that now. According to the logs, the car keeps building boost and load until Working on replacing cam seals on my cheap IS300 with 213k miles. Has no pull until speed builds up and then it starts running smoother. 83 posts The engine was warm by then and it only ran very rough but didn’t stall. Fingers crossed the full throttle under load misfire has died a similar death. I can still remove the high speed adjust nozzle from the carburetor and it runs perfect. I had a CEL right after cleaning my TRD Air Filter (coincidence) A few days later it went away. Need help with is300 misfire and brakes. It would still have the misfire on cylinder 5 under load. O2 sensor light so replaced it, changed all the vacuum hoses. When I plug my reader in, I consistently get a cylinder 6 misfire code, and when I clear it, the misfire magically goes away. y replace 6 new injector, new maf sensor, no vaccum leak, spark plugs wire are new, i swap the igniter coil and spark plug, but same problem. Rich's Brazen Orange 2006 Pontiac GTO 1965 Malibu SS L79 - Maderia Maroon, 1969 C10 Shortbox Fleetside - Maroon, 1964 GTO Tripower - Sunfire Red 2004 Torrid Red GTO. Jump to Latest Hey y'all, I bought a 2018 Mazda 3 Grand Touring Hatchback in July of 2024 and have had some issues with a misfire and 02 codes since I bought it. 5 diagnostic misfire. New valves, new fuel filter, injectors cleaned with new caps, new spark plugs, new distributor and cables, new tps, new AFM and fuel pressure tests out fine. Just climbing through gears revs to 6500 no problem but under load it stumbles. Save Share It gives the load in units of g/rev. Either that or maybe a bad ignition coil, but i think it could actually be the head gasket. It has a flashing CEL under hard acceleration and a lack of power. Codes: P0301 . If you change them yourself make sure to use a generous amount of the dialectric grease. The car idles fine and I can rev it no problem. It developed somewhat progressively, a few days after first feeling it slightly, it got bad. It seems nothing I do changes it. Code P1349 VVI Malfunction Bank 1. No CEL no codes. The P0455 and P741 codes were already existing. After having the sensor replaced the car has now developed a misfire under load and a slight shunting of revs at idle. timarnold Discussion starter. So now it's definitely misfiring on 1, 3, and 5. You've got an engine that idles perfectly and drives down the road smoothly with no noticeable issues, but when you hit the gas hard, the engine drops out. '97 Lada Niva with the GM monopoint system, sometimes runs great sometimes runs shit, misfires at idle/under load, throttle hesitation and bucking when accelerating, also down on power. 1K views 19 replies 6 participants last post by nicoucf2 Jun 26, 2024. I could sit and rev the engine in neutral with no issue. Any time i was under load like slightly too high of a gear, it would misfire like mad, until you back out a little, then it felt like it would finally "catch" and take off like a rocket. When the car is under load, there's more air packed in the spark gap. carb Roller rockers first gen is300 misfire misfire at idle misfire cylinder 4 5 6. UPS says it will be here Wednesday. 3 vortec that over the past year or so has developed a heavy misfire under load like pulling a trailer or sometimes just pulling away from a stop quickly. With a AAA discount, it was ~$50, whereas a Mopar part for $110+tax, and more importantly, 1-2 days on special We hooks it up to the scanner and all we get is a random misfire code. Only under these specific conditions: uphill, at highway speed at low RPM It’ll vibrate violently, and the engine light flashes, usually a misfire indication. I have replaced all 4 sparkplugs (checked gap),ignition coils, wires, and coil pack. not sure what next. My brother has a 2004 Tahoe z71 with the 5. My car only misses around 1300rpms, according to live stream data from OBD scanners. since it doesnt happen in neutral, its kinda making me think ignition. When it does this, it would miss consistently and would drive a Hey guys I’m at a loss and need some help. PC kept shutting off when under heavy load at home. Recently, this problem has become worse. It starts, idles and drives smooth, but the problem is acceleration under load. did you ohm out the coil? Its not a major misfire I can feel pulsing. It's almost like a flutter now. On the injectors, they do look pretty ugly, but think about it, Highway running 70-75mph. Under a low rpm load (like going up a slight hill) going 38-40mph it misfires or feels like it hesitates. Now since this happened after plug swap I suspect a bad plug. Everything else has been changed including the engine and all sensors and ancillaries. 0L - Misfire Under Load - P0300 Code. Under heavy/full throttle, the break up starts around 3000 rpm and continues to 4500 rpm where the car falls flat. I recently purchased a 06 ram with the 5. 0L L6 Harmonic Balancer Crankshaft pulley The price seems too good to be true though. I'm a helicopter mech. The cel went off momentarily but quickly went away during one of the harder Greetings, My ride: 1997 Tahoe 2 door 5. r/IS300 A chip A close button. jsRRHSE Discussion starter. When I try to start it, it just cranks. I am getting misfires when I step on the gas under load under 2k rpm. This is followed by a service engine light almost immediately, and the car continues misfiring. Jump to Latest 5. Normal driving no issues. Have about 5k miles on a top end engine rebuild. It seems to be when I'm back home from school that the hills in the area are at specific grades (near Chicago, not steep grades, just a 3-6 degree incline), the engine will sit at a specific speed and specific rpm, just under 2000 rpms, maybe 1950, and will begin to shake. Jump to Latest Misfires only happen at idle and not under load while driving. i opened up the ECU and try to find any burn, brown, flaky, and anything that looks dysfunctional to the ecu and IS - 2nd Gen (2006-2013) - IS250 Engine misfire-explained - Hi guys and gals, I am a Lexus Senior Certified tech at a large Lexus dealership. Before tearing the top end down (spark plugs, wires, and ignition So I just finished timing belt job on my 2001 IS300 [Automatic] with the OEM kit with cam/crank seals, WP, etc. I got a PO300 (random cylinder misfire) PO301 (cylinder 1 misfire) and a PO303 (cylinder 3 misfire). 7 hemi in it. 9% of the time. burned Discussion starter. When i first drive the car in the morning (cold engine) the car drives fine with no misfire problems, soon as i stop and turn it of, with the engine already warm, and turn it on back again few minutes after starts the misfire. Getting and engine shudder as well flashing SES light which then goes solid. This is my daughter's car. Good Luck! Cory B. Messages 69 Reaction score 139 Points 33 Location Australia. Reply. (WIP), you can find git in the description under the video youtube 01 - 06 Lexus IS300 ; Random Misfire Random Misfire. after doing so i have noticed that it has a miss only when when under a load such has climbing a hill or in over drive runs smooth until these times! Im wondering if there is a P0300 code hidden showing just a general misfire. Replaced ignition wires replaced spark plugs replaced {02 sensors (aftermarket)} Checked for vacuum leaks none found. The fact it happens under load suggests it's ignition related though. Sounds really good at idle, and even sounds just fine driving around under lighter load, but when I got WOT, it just sounds kind of off and you can really tell that its lacking power. I have had an odd problem for the last several months that has defied my analysis. But the issue is if you resset the ECU< you also erase information that was logged so the proper The car runs good until it see's load. Turns out there was a vacuum leak at the TB. I also recommend buying a new bolt. I didn't see any point in testing it (other than with a scope, which I do not have) because the problem only presented when accelerating under load. My car is a 2003 530 Sport, 5 sp manual, M54 engine. (At a stop light, car was idleing at around 850, then dipped real low (below 500) for a few seconds- whole car shook, but kept running). There is no CEL. My Issue: Getting a random misfire P0300 at higher speed( over 75 MPH) or when the engine is under load, uphill or passing with AC on. 1 Theme . Mileage-may or may not suffer depending on how much the air-fuel mixture has changed. Mileage reduction this winter. Tags 2. Come in and enjoy our articles, galleries and information on aftermarket parts for the IS300, IS250, IS350 Check the O2 sensor output under the high RPM/high load conditions, if it leans out it suggests you have a fuel problem, if not, probably ignition. Jump to Latest Middle of a highway drive, acceleration gets sluggish for 15-30 seconds and MIL flashes, so thinking misfire, but before I can even change lanes to get off the highway it goes away completely - doesn't become solid, and doesn't reoccur for the remaining 100km of my drive. If the misfire count exceeds the threshold levels and could cause emission control system performance deterioration, the ECM illuminates the MIL and stores a Diagnostic Trouble Code (DTC). put it in gear and held the brake no studder spun the tires. Usually the issue shows itself at low rpm/high load, or at any really high throttle. Decided to put a little more load on the car and threw codes p0300, p0306 and once again p0303. I had sorta the same issue if it's One new thing I have learned is that the car only misfires in low rpms/lower gears, preferably between 1k to 3k rpms. 7 engine with 211K miles. Feb 3, 2013 #5 OP . 4l automatic No check engine light. My setup is similar to yours only with a Holley 570CFM carb and headers. Drive the vehicle under a steady load at a stable speed in a lower gear, keeping revs above 3. Problem Solved. My car will randomly -not all the time- misfire while I'm idling. Car drives fine 99. coltonflak12. Accelerate and feel a stumble or miss under load more than half throttle. 7:1 sweet spot, this can cause your Lexus (quoted from post at 21:14:40 05/26/18) OK, I am revisiting the 8N misfire problem that I wrote in about several weeks ago. Also idling it runs smooth. I cleared them but no matter how hard I try I can't get them to come back. Code: P0300 - Multiple random misfires. Then the misfires began. Might try moving the coils around and see if the mis-fire follows the coil. Visit one of the chain auto parts stores and have them plug in their scanner. I had gotten a tune up not too long ago, so I'm pretty sure now 70's 350 misfire undler light load I am having a similar problem and am just about ready to give up. The motor only has about 20 miles on it. Codes: P0302, P0304. 0. Update: After letting the car cool off for 15 minutes, I turned it back on with the hood closed and it began to misfire with the fan on. If the misfire continues maybe fuel injectors Soooooo my truck’s 5. Check for a vacuum leak. I have had ZERO trouble codes or lights whatsoever, and there has been NO drop in fuel mileage, and it accelerates like a I've been chasing a misfire on Cylinder 3 of a 2001 IS300. By harperc April 24, 2008 in 01 - 06 Lexus IS300 UPDATE: I held out a couple weeks and the check engine light came on; got it looked at & realized that it was a misfire on the #5 cylinder. It sounds healthy at idle, but when I go WOT, its just not there. They removed all the plugs and put in a dummy one to show there was not spark. Clean the MAF is always a good idea. It shows 0. 6. Off exit. Only happens under load. My local garage who carried out the work Because otherwise it could actually have a blown head gasket and this is why it misfires so badly under load. ?? i checked , When it misfires is it under a particular throttle load? (say light throttle but fine under full throttle) to Lexus IS Enthusiasts. 68 Chevelle, LS2, TVS2300, density tuned (no MAF). I switched the coils back and everything was back to “normal”. 122 posts · Joined 2012 Add to quote; Only show this user #1 · Apr 21, 2015. 4L is doing something new. I recently bought an 01 is300 that would not start. Already checked/changed Did a compression test, all cylinders and they were consistent at 190psi. Misfire under load. Sometimes, it does not start too good when hot either, just kind of stumbles to life and seems like it wants The car's got a pretty bad stutter when under load (merging onto the highway type). Come in and enjoy our articles, galleries and information on aftermarket parts for the IS300, IS250, IS350. does not mean they are still good. Make sure there is not a lot of It would misfire every so often while under load (in drive) and it would sometimes get into small fits of misfiring. It doesnt show any of the long crank/ rough idle symptoms of a bad pump. It sounds like it wants As soon as I started to drive it a little harder it coded up P0300,P0303&p0304 random misfire on cylinders 3&4. If I accelerate normally up through the gears, it works great. 0L V8. Fuel will not show up in anything. I have this vehicle in my shop which I can't figure out the issue which is causing a misfire. It's constant and entirely obvious. It has long tube catless headers and custom exhaust everything else under the hood The car continued to misfire, and trouble codes P0300, P0301, and P0305 returned quickly. If the gap is too wide or the coils weak, it could misfire under load Lexus IS300 SC300 GS300 Toyota Supra 3. I've had all 3 of them burnt on different trucks or A subreddit for first generation Lexus IS300 owners and enthusiasts. 8 - 1 CR Pro Comp Aluminum heads 190 cc Pro Products performer style intake Demon 750 vac. Acceleration lag/noise. The last time my car went on the dyno, it developed a really bad misfire/break up under heavy load. It is not under load and comes off easily if needed. You guys think it's bad gas or bad spark plugs? Seems like most people jump to conclusions (like a headgasket or straight to a cylinder Under load while building boost from around 2000rpm to 2800rpm there's a misfire. 5 L4 and 6 speed manual transmission. J. This tiny mesh filter can cause idle and eventually misfire issues but it can make the car act like it wants to stall when engaged(as it should if working correctly). Hello, ive had a problem with my tc for a couple of months and was wondering if it has happened to anyone, also looking to fix it. P0300 random misfire code set. The tractor still misfires and loses power under load. He thinks its a knock sensor is bad, he replaced one about 2 years ago but he thinks he may have pinched a wire for one of the knock sensors when he After doing everything I’d been throwing a code for cyl 3 misfire. I have a severe misfire under load. Replaced points, condenser, plugs, Under light and steady throttle no problemsbut under harder acceleration the car misfires/hesitates pretty severely making it nearly undriveable. Save Share Reply Quote Like. Check your fuel pressure to ensure your getting proper flow under load! Your at the very beginning of figuring The idle continued to rev, or almost die out. Weapon-R Intake. Anyway, it was quite Misfire after timing belt replacement. In the past I had rough running under load, and it was the Plug wires. Only has front O2 sensors and no evap system. 9K subscribers in the IS300 community. Show Less . Epperson Junior Member. This started about 3 weeks ago. Cause (probable): Dirty fuel injectors, dirty engine valves, and combustion chamber deposits Fix: Chevron Techron Concentrate Plus (or similar known PEA-containing (polyether amine) fuel system cleaner products like Gumout Regane, Redline Misfire Under Load and Oil Leak. My 70 B (standard ignition) just recently developed a misfire under load (2500-3000 RPM, 3rd or 4th gear). 4 FX4 ~ Hers SOLD - silver '03 MR2 Spyder - white '91 MR2 hardtop Lately, the car has been hesitating extremely bad (misfiring) under 2k rpm when 75-100% throttle, especially going uphill. I bought the truck a year ago, and ever since i had it, it has had a light load misfire on the highway around 60-70mph. StevenQ23 · Started 12 hours ago. I am having a misfire under load problem. downshift to 5th and same thing under load only. To test your theory, I unplugged the Misfire under load. The car currently has no power what so ever. OP. The car was breaking up really bad under load so the shop (Extreme turbo shop in lakeland fl) called haltech and they said with that car and application a RA-10 is required. SUMMARY Symptoms: Gradually increasing car hesitation, power loss, sluggish acceleration, lowered fuel economy. mis-fires can also be caused by low compression. my is300 again show misfire in p0303. Changed the spark plugs and plug wires. Primarily at idle, smooths out at rpm. 6K subscribers in the IS300 community. I have an 01 IS300 with 77K on it. T. 2. I took the rover to the shop to have a flashing CEL under load diagnosed. Seems unlikely, but a look under the valve covers might be a good next step to ensure cams and buckets are all in order with proper lash. Never happened before, and nothing ignition related has changed. Morning all. I drove the car last night, and there is a little sputter, and somewhat of a rough idle, intermittenly. Hi Folks, I have an interesting problem. Whenever I try to come to a hard stop the car doesn’t want to stop fully. Also, Are the misfires on specific cylinders only? Just because the coils are low mileage. Put a tester on it and I got a P0300 (random misfire) with a P0302 and a P0306 (cyl 2 & 6 misfire) Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. Looks like the Redex didnt work and a service and throttle body cleanout is on the cards. Castro81 · Started February 14. Yesterday I took the car up the road to the store and got on it a I went out to dinner and after wards the car started driving really funny on the way home, misfiring under medium to wide open throttle. -2001 Lexus IS300, Automatic, with ~282,500 miles on it. Initially I 9. I can get it to reoccur under the same conditions mostly only in 4th, 5th, 6th gear. I have so far changed the timing belt and tensioner, plugs and wires, ocv, cleaned the screen, fixed cracked lines, new vacuum hoses, fuel strainer, fuel filter, tried 4 different maf's, and cleaned the injectors (removed and cleaned) 9. March 30, 2015 at 4:39 pm. Truck has poor MPGS, idles rough, loss of power. If all else fails, do a compression check. I get codes P0300-306 which are random misfires on all cylinders. . 6 shots of Redex through the engine and still misfiring and low on power under load. While driving up hills or increasing load, the CEL will flash multiple times, I pull over as I know CEL flashing is not good. But if I try to step on the gas when going slow in too high of a gear (20 mph in 4th gear for example) I get heavy stuttering. a good voltage reading at the AEM/ECU and block while the car is under any load should rule out a grounding issue Hi, i'm new on this forum and i have a misfire problem on my beloved Lexus is200 sport V6 2001, that is making me going crazy and desperate. 1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks Misfire under load. I've replaced, plugs, wires, and coil pack yet the issues still occurs. 3L 5spd VIN X with 70k on it. He thinks it is the spark plugs causing a misfire, but I think something else is going on. A fuel probably could be a variety of things. Driving in gears 1-3 are bearable but in 4 and 5 there is little power and the truck surges, stumbles, and shakes awful. Under load, 6th gear at 55-60 mph, when I floor it motor stumbles/misfires. It seems to be when it's at operating temperature, but I am not 100% positive that it only does it when warm, I think it's done it on the cooler side as well. 90 Ls400 Misfire / Bucking / Jerking, Worse Under Load Theme . Jump to Latest 11K views 14 replies 4 participants last post by youngbro401 Apr 30, 2015. just back from the 660 mile weekend trip. Good luck! Any questions feel free to ask as this is semi-fresh on my mind Oh, almost forgot. A subreddit for first generation Lexus IS300 owners and enthusiasts. Is300 multiple misfire I have a rough idle, stumble under load, and I believe a misfire somewhere. Change spark plugs and problem should be fix. Hello Folks. IPB 4. I just got a new fuel pump a few months back. Open menu Open navigation Go to Reddit Home. 01 - 06 Lexus IS300 ; Mild Sputtering On Acceleration Mild Sputtering On Acceleration. was hoping to get some help before I decide to just scrap this engine and throw in I have my 2002 IS300 5 speed car has been running great %100 stock recently It started misfiring real bad, Codes that have come up are as follows P0301 Cylinder #1 — Misfire Detected P0302 Cylinder #2 — Misfire Clean maf and throttle, check for vacuum leaks, reset ecu, do relearn procedure, check for codes again if issue persists. Misfire– If the air-fuel mixture has gotten too far from the 14. looked up a few other things with the scanner and found out that cylinder #6 has over 60+ misfires and the other cylinders #2,#3 will have around 3-8 misfires. Those gears are almost unusable. except everytime I get to the top of the hill the light goes away and the vibration stops. After not being able to start my 52 Aero the AA diagnosed a faulty crankshaft sensor. Ok now for the headache, I have a 1997 chevy s-10 4. She bought it about 6 weeks ago with 133K miles. cleared the code and let it run in the garage for 15 min ran great no codes. Get app Coil pack is just volts being send to the spark plugs. 2002 IS300 Sportcross -2010 F250 6. P0300/pO303/0304; By Springer December 24, 2012 in 01 - 06 Lexus IS300 Code readers do nothing unless you under stand criteria of the code, if I have a data list, I need no codes . P0303 Lexus Code - Cylinder 3 Misfire Detected hi. As of today (11/28/12) the light is still on. This randomly started on my way to work this morning along with a flashing engine light. Hello, I have been chasing this misfire under load problem for Would that be causing the lean condition for it to misfire under load? Could it be that my fuel injectors are dirty? Bad coil? Thanks!!! 1996 Red 4. mxk qhuf toroi erzgmii dvtw ymrygua dxjchjpgx bempdkdy emhf movnw mou tlnsa iet svlt tgb