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P0300 Diagnostic Trouble Code Discussion for May 2008

Multiple Misfire Detected


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Trouble Ticket Help Requests for DTC P0300
Help Request Posted
1998 Jeep Wrangler Sport 4.0L MIL Lamp on VIN: 1J4FY19SXW
P0300: Multiple Cylinder Misfire Detected. ... wrangler 4.0 L. with a MIL on and codes P0304, P0305 and P0306. no complaints of poor performance. We tuned this complete with wires and also a motor vac. Light came back on after highway drive. After research we found a TSB about valve springs. We pulled ...
May 01, 2008
1999 Suzuki Grand Vitara JLX 2.5L MIL Lamp on VIN: JS3TD62V5X
P0300: Multiple Cylinder Misfire Detected. Hello, Thanks ahead for all the brain busters help. Customer does not seem to be getting satisfactory help from closest Suzuki dealer. We told them that Suzuki offered an updated computer to correct for this false misfire codes. So they took it to dealer 3 ti...
May 01, 2008
2002 Volkswagen Passat GLX 4 Motion 2.8L Poor Idle Quality VIN: WVWYH63B92
P0300: RANDOM MISFIRE - intermittently and CEL has never come on. This vehicle has a mild shake at idle but no other driveabilty issues. We've changed the plugs, wires and valve cover gaskets (leaking oil onto spark plug boots). Everything scans well, but we noticed on a compression test that the left bank took 7 turn overs ...
May 01, 2008
2004 Chevrolet Colorado LS 3.5L Misfire, MIL Lamp on VIN: 1GCDT13624
P0300: Engine Misfire Detected. swapped coils ,new spark plugs no change smooths out above idle, compression the same on all cylinders injector almost impossible to get but it is clicking like the others, no vaccum leaks found must be a common problem because we have another truck with the s...
May 02, 2008
1998 Oldsmobile Intrigue GL 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3WS52K4W
P0300: Engine Misfire Detected. hey all. my son has a 98 intrigue 3.8. at idle the misfire counter starts rapidly counting. at about 1500 rpms the misfires stop. runs great on the highway. not good at idle. the engine was replaced about 3000 miles ago with a 50k mile used part. ran great unt...
May 02, 2008
1999 Suzuki Grand Vitara JLX 2.5L MIL Lamp on VIN: JS3TD62V5X
P0300: Multiple Cylinder Misfire Detected. Hello, Thanks ahead for all the brain busters help. Customer does not seem to be getting satisfactory help from closest Suzuki dealer. We told them that Suzuki offered an updated computer to correct for this false misfire codes. So they took it to dealer 3 ti...
May 02, 2008
2003 Chevrolet Express 3500 6.0L Misfire, MIL Lamp on VIN: 1GCHG35U43
P0300: Multiple Cylinder Misfire Detected. Hey Gm fans got a good one here, this 2003 g-van has a miss tech2 says number 6 cyl, fuel pressure ok, we have swaped ignition coils, fuel injectors, checked fuel rail for debries, none replaced upper intake gaskets, have spark and injector pulse at cyl 6 vacu...
May 06, 2008
2000 Dodge Intrepid 2.7L rich, -25% fuel trim VIN: 2C3HH46R9Y
P0300: Multiple Cylinder Misfire Detected. ... engine! Now its my turn. This vehicle came in with the mil illuminated, a stumble and rough run on cold mornings. I checked the code, a P0300 random misfire code, and it does misfire on cold start up but as soon as it goes into closed loop it smooths out...
May 06, 2008
2001 Mitsubishi Eclipse GT 3.0L Misfire, MIL Lamp on VIN: 4A3AC54H01
P0300: Random Misfire Detected. we then sent vehicle to dealer. mitsubishi had car for 4 months and came up with this...we need to replace the engine due to a variance in the crankshaft due to a rod knock. this is turn is telling the pcm to shut down injector to cylinder 1. going back to ori...
May 07, 2008
1999 Toyota Solara SE 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2T1CF22P4X
P0300: Multiple Cylinder Misfire Detected. Hi everyone: this 99 solara misfires on cyls. 2,4,6 always. we checked timing marks twice and they are perfect. the other shop tried two used ecms. The spark is clean and strong on all six cylinders. The main thing we found is that the front injectors sound d...
May 08, 2008
2002 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54KX2
P0300: Multiple Engine Misfire Detected. Hey Guys I have good one. this Lesabre miss's and sounds to be popping back threw the intake, only when hot and under heavy load. When it is missing the 18X signal looked funny and replced the CKP sensor, no change. The o2's go dead lean. ( fuel pump wave look...
May 09, 2008
1999 Toyota Solara SE 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2T1CF22P4X
P0300: Multiple Cylinder Misfire Detected. Hi everyone: this 99 solara misfires on cyls. 2,4,6 always. we checked timing marks twice and they are perfect. the other shop tried two used ecms. The spark is clean and strong on all six cylinders. The main thing we found is that the front injectors sound d...
May 09, 2008
2003 Chevrolet Blazer LS 4.3L Misfire, MIL Lamp on VIN: 1GNDT13X23
P0300: Multiple Cylinder Misfire Detected. HEADACHE!!. owner of vehicle is a friend of shop. came in, service engine soon light on. scanned- po300. cyl. #4 misfire. decided he wanted to tune it up himself. replaced fuel filter, cap, rotor, plugs and wires(with quality products). came back, same problem...
May 12, 2008
2003 Chevrolet Blazer LS 4.3L Misfire, MIL Lamp on VIN: 1GNDT13X23
P0300: Multiple Cylinder Misfire Detected. HEADACHE!!. owner of vehicle is a friend of shop. came in, service engine soon light on. scanned- po300. cyl. #4 misfire. decided he wanted to tune it up himself. replaced fuel filter, cap, rotor, plugs and wires(with quality products). came back, same problem...
May 13, 2008
2003 Chevrolet Express 2500 6.0L Misfire VIN: 1GCGG25U33
P0300: Multiple Cylinder Misfire Detected. hi every one, truck came in with engine misfire, run scanner and found code po300 random misfire, #6 misfire, truck never had tune-up, so replace spark plugs, wires, gas and air filter, after tune-up. started van and runs great, test drove and came back to sho...
May 14, 2008
2003 Chevrolet Express 2500 6.0L Misfire VIN: 1GCGG25U33
P0300: Multiple Cylinder Misfire Detected. hi every one, truck came in with engine misfire, run scanner and found code po300 random misfire, #6 misfire, truck never had tune-up, so replace spark plugs, wires, gas and air filter, after tune-up. started van and runs great, test drove and came back to sho...
May 15, 2008
2000 Dodge Intrepid 2.7L rich, -25% fuel trim VIN: 2C3HH46R9Y
P0300: Multiple Cylinder Misfire Detected. ... engine! Now its my turn. This vehicle came in with the mil illuminated, a stumble and rough run on cold mornings. I checked the code, a P0300 random misfire code, and it does misfire on cold start up but as soon as it goes into closed loop it smooths out...
May 15, 2008
2000 Ford Excursion XLT 6.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FMNU40S1Y
P0300: Random Misfire Detected. ... with codes p0174,p0306,p0307 and runs rough cold or hot, in and out of gear. Using the ford scanner and watching the power balance graph, cylinders 6,7,8,9,10 all have slight misfires 6 and 7 being the worst. my fuel pressure is 29psi(within spec). smoke t...
May 15, 2008
2003 Chevrolet Silverado 2500 6.0L Misfire, MIL Lamp on VIN: 1GCHK23U63
P0300: Multiple Engine Misfire Detected. Hello everyone, this truck we put a used Transmission in it did not do anything around the engine Trans did not go in reverse, after replacing the trans we have a miss in the # 7 and 8 cylinders.Any ideas or anyone have seen this I would appreciate it fuel tri...
May 16, 2008
2002 Mitsubishi Montero Limited 3.5L Misfire VIN: JA4MW51R2J
P0300: Random Misfire Detected. ... misfiring for few seconds on cold start up with code p0300. i changed plugs +wires + valve cover gaskets because oil was getting on spark plugs through the spark plug holes. few days later, the truck came back with the same code. I'm stuck, i heard about m...
May 20, 2008
2001 Chevrolet Express 3500 5.7L No Start, MIL Lamp on VIN: 1GAHG39R11
P0300: Multiple Cylinder Misfire Detected. this came in as no start - bad ignition coil- installed coil/spark plugs/ignition wires as there was multi misfire in computer. Vehicle will start but very very hard but runs fine once started.The only reliable way to start it is shoot a little 2+2 in intake t...
May 21, 2008
2002 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 3GNEK13T02
P0300: Multiple Cylinder Misfire Detected. this customer came in saying-- i replaced engine and it is still "skipping",(used engine). i had felt the misfire, but had also found that the injector o-ring on the #1 cylinder was sucking air. the o-rings were recommended for replacement before going...
May 21, 2008
2000 Mitsubishi Galant DE 2.4L Surge VIN: 4A3AA96GSY
P0300: Random Misfire Detected. vehicle came in with obvious miss, found spark plug holes full of oil, r&r valve cover & resealed replaced plugs & wires & insulators, miss is gone but on acceleration @ 3 grand it act's just like a rev limiter runs good up to 3ooo rpm. any ide...
May 27, 2008
2004 Chevrolet Classic 2.2L Surge, Misfire, MIL Lamp on VIN: 1G1ND52F64
P0300: Multiple Engine Misfire Detected. Have a Malibu here that has a rough Idle and misfire on all cylinders at Idle. Misfire will almost go away above 1500 rpm. Plugs are clean and dry. Injector flow test was from 52psi and droped to 40psi and all cylinders. Tested the MAP with a vacuum pump and l...
May 29, 2008
2004 Chevrolet Aveo 1.6L MIL Lamp on VIN: KL1TD52674
P0300: Engine Misfire Detected. thanks for any and all help on this one. orginially came in with po300 and po1781. changed plugs and wires. no help, can find no intermitten miss. tested po1781 tcm sending engine speed info to pcm false. test called for checking voltage on c.a.n system from p...
May 30, 2008