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P0300 Diagnostic Trouble Code Discussion for November 2009

Multiple Misfire Detected


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Trouble Ticket Help Requests for DTC P0300
Help Request Posted
1998 Chevrolet Cavalier 2.2L Poor Idle Quality, Surge, Cuts out, Stall, Misfire
P0300: Multiple Engine Misfire Detected. This car came from another shop, see related repair history and I'm loosing it on this quad 4. Idle it runs rough,engine bucking back and forth. Misfires on all cylinders and just of idle, misfires do not show on misfire graph but can see the engine still rock...
November 01, 2009
2006 Chevrolet Uplander 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDV23L86
P0300: Multiple Engine Misfire Detected. This van has a misfire at idle when warmed up. Scan tool shows cylinder #6 misfiring when problem occurs. sparkplug replaced, wires swapped, fuel injector checked for resistance & spray pattern. scoped all injectors with low amps probe - all show good! Vac...
November 03, 2009
2003 Land Rover Discovery HSE 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: SALTY16443
please help. we have replaced camshaft,lifters,timing chain and spark plugs. we have good spark,fuel and valves seem to no be sticking,good compression and does not drop. what would be your next step? fuel trim all reads negative by the scan tool.
November 03, 2009
2004 Maserati Coupe GT 4.2L Misfire, MIL Lamp on VIN: ZAMBC38A43
I have misfires on bank 5-8 sometimes on all 4 cylinders, sometimes only 5,7 & 8. I've moved around the spark plugs, moved around the ignition coils and the misfire hasn't alternated cylinders. I've checked for power and ground at all the connectors and ev...
November 03, 2009
2001 Oldsmobile Intrigue GLS 3.5L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on, no start VIN: 1G3WX52H41
P0300: Multiple Cylinder Misfire Detected. ... was flooded removed plugs and found soaked in gas.replaced started but ran rough misfiring on 2/3/4/5/removed fuel rail and vis checked inj looked ok checked fuel pressure ok removed and swapped coil packs no change.sprayed with water no change.checked dat...
November 03, 2009
1999 Volvo S80 T6 2.8L Hesitation, Misfire, MIL Lamp on VIN: XV1TS90D4X
P0300: random missfire. Car will start and run, idle a bit rough, check engine light on. Poor acceleration, be do not feel a missfire all of the time, but on accasion it will bump like a plug or coil?? We did test both of the front o2'S, and tested bad. replaced both with no good res...
November 03, 2009
1999 Ford Explorer XLT 4.0L Misfire, MIL Lamp on VIN: 1FMZU34E8X
P0300: random miss fire. Misses bad on cylinders 1-2-3, so far I have switched up and down stream O/2 Sensors and that didnt change a thing. I checked for vaccum leaks around intake and doesnt seem to be any, Some things I have noticed is a wierd almost "chirping" sound in the...
November 04, 2009
1998 Mercury Villager (Van) LS 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 4M2ZV1114W
P0300: Ramdom misfire. Well I have this van than is giving me a headache, It has been having a misfire intermediate from time to time maybe every 2 months for a couple of weeks, but now is pretty much all the time, specially after warm up, running really rich, I try 2 reman. distrib...
November 04, 2009
2001 Oldsmobile Alero GL 3.4L Misfire VIN: 1G3NF12E41
P0300: Multiple Cylinder Misfire Detected. hi i got the cylender 2 misfire and i changed spark plugs wires fuel injecter ignition coil module
November 04, 2009
2007 Chevrolet Silverado 1500 Classic LS 4.3L Misfire VIN: 1GCEK14X87
P0300: Multiple Cylinder Misfire Detected. hi everyone,this truck misfires at 1500 rpms faithfully the fuel trim no. are not high.it acts like a lean condition caused by a egr but there is no valve.only thing i see is the cam retard is a -7 degrees.would a ign module cause this?any help would be great,...
November 05, 2009
2003 Land Rover Discovery HSE 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: SALTY16443
please help. we have replaced camshaft,lifters,timing chain and spark plugs. we have good spark,fuel and valves seem to no be sticking,good compression and does not drop. what would be your next step? fuel trim all reads negative by the scan tool.
November 05, 2009
2000 Volkswagen Jetta GL 2.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 3VWSC29M2Y
P0300: Random Misfire. Howdy Techs, here is a weird German VW problem, When cylinder # 4 was misfiring, fuel pump relay would click rapidly causing multiple misfires. Pin testing relay socket no problems found. Has anyone come across this ? Want to ship the vehicle out. Have driven ...
November 05, 2009
2006 Chevrolet Silverado 1500 LT 5.3L Poor Idle Quality, Misfire VIN: 2GCEK13T76
P0300: Multiple Cylinder Misfire Detected. ... check engine light. P0300. Tuned up the truck and ran much better. New A/C Delco plugs, wires, fuel filter, and air filter was nearly new. Came back with a P0300 code again. With scanner hooked up, we can watch #5 cylinder misfire quite often but not all t...
November 06, 2009
1996 Jeep Grand Cherokee Limited 5.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1J4GZ78Y3T
P0300: Multiple Cylinder Misfire Detected. This vehicle belongs to a friend of mine.He says the problem started when he left the engine idling one day he had visited a friend.When he came out the engine was misfiring.It will misfire at idle or at highway speeds.When I got the vehicle I pulled the spark...
November 06, 2009
2000 Volkswagen Jetta GL 2.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 3VWSC29M2Y
P0300: Random Misfire. Howdy Techs, here is a weird German VW problem, When cylinder # 4 was misfiring, fuel pump relay would click rapidly causing multiple misfires. Pin testing relay socket no problems found. Has anyone come across this ? Want to ship the vehicle out. Have driven ...
November 06, 2009
1999 Volvo S80 T6 2.8L Hesitation, Misfire, MIL Lamp on VIN: XV1TS90D4X
P0300: random missfire. Car will start and run, idle a bit rough, check engine light on. Poor acceleration, be do not feel a missfire all of the time, but on accasion it will bump like a plug or coil?? We did test both of the front o2'S, and tested bad. replaced both with no good res...
November 06, 2009
1998 Mercury Villager (Van) LS 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 4M2ZV1114W
P0300: Ramdom misfire. Well I have this van than is giving me a headache, It has been having a misfire intermediate from time to time maybe every 2 months for a couple of weeks, but now is pretty much all the time, specially after warm up, running really rich, I try 2 reman. distrib...
November 07, 2009
2006 Chevrolet Silverado 1500 LT 5.3L Poor Idle Quality, Misfire VIN: 2GCEK13T76
P0300: Multiple Cylinder Misfire Detected. ... check engine light. P0300. Tuned up the truck and ran much better. New A/C Delco plugs, wires, fuel filter, and air filter was nearly new. Came back with a P0300 code again. With scanner hooked up, we can watch #5 cylinder misfire quite often but not all t...
November 09, 2009
1999 Pontiac Firebird Trans Am 5.7L Misfire, MIL Lamp on VIN: 2G2FV22G8X
P0300: Multiple Engine Misfire Detected. car came to us friday with steady miss on # 6 cyl and heavy white smoke from tail pipes. Does not smell like coolant burning and radiator is full. Thought maybe diesel fuel but cust is sure thats not it as proble has been intermittant since august. Replace all...
November 09, 2009
2005 Acura RL 3.5L Misfire VIN: JH4KB16505
P0300: Random Misfire Detected. help!!! this car came from another shop. when you first start the car it runs rough and mis-fires. when you give it gas, it sputters then revs ok and then idles ok. if you drive it up the road easily, it is ok, but under a load it mis-fires. we have check fue...
November 11, 2009
2003 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNEK13T13
P0300: Multiple Cylinder Misfire Detected. Complaint is missing at idle, with check engine light on & flashing @ times. Scan tested with tech2 & seen #8 misfiring bad under 1200 rpm, & #7 about 1/2 misfires of #8. All other cylinders ok. Spark is excellant to cylinders(tried 2 diff plugs, c...
November 11, 2009
2003 Jeep Grand Cherokee Laredo 4.0L Surge, Misfire, power loss VIN: 1J4GN48S53
P0300: Multiple Misfire Detected. Sometimes this Jeep will run normally at in-town speeds. It often looses power on the highway and won't go faster than 100 km/hr. It doesnt want to rev much past 3200. If you mash the gas pedal, it will bog severely and refuse to go past 4000 rpm and the CEL f...
November 11, 2009
2001 Oldsmobile Alero GL 3.4L Misfire, MIL Lamp on VIN: 1G3NL52E61
P0300: Multiple Cylinder Misfire Detected. This car misfires after sitting for a while, but only on cyl #1 and only for 10-30 seconds or so then it smoothes right out. I have swapped plug and wire with others to see if the miss moves, but it does not. I removed upper intake and fuel rail, pressured up ...
November 11, 2009
1997 Chevrolet Blazer LS 4.3L Hesitation, Cuts out VIN: 1GNDT13W0V
P0300: Multiple Cylinder Misfire Detected. Hmm, need some help here guys- got a drivability problem that seems unusuial. When cold first up in the morning- vehicle hesitates when leaving a stop light on a light acceleration. If i accelerate hard it will not do it. Once the vehicle is completley warmed ...
November 12, 2009
2000 Chevrolet Silverado 1500 5.3L Poor Idle Quality VIN: 2GCEK19T9Y
P0300: Multiple Cylinder Misfire Detected. ... one. I am working on a 2000 Silverado with a 5.3. The truck Idles very rough on cold start but clears up fairly quickly. Had code P0300 stored in computer but light was not on (customer states that it came on briefly). Fuel pressure is 56-58 KOEO which is ...
November 12, 2009
2001 GMC Savana 2500 5.0L Misfire VIN: 1GTFG25M11
P0300: Multiple Cylinder Misfire Detected. need help truck came in with misfire and extend crank hard start. could smell the fuel while it ran. performed complete tune since wires were worn through againt dog house. fuel filter still said gm on it etc.. also replaced injector assm with updated design. ...
November 12, 2009
2001 Oldsmobile Alero GL 3.4L Misfire, MIL Lamp on VIN: 1G3NL52E61
P0300: Multiple Cylinder Misfire Detected. This car misfires after sitting for a while, but only on cyl #1 and only for 10-30 seconds or so then it smoothes right out. I have swapped plug and wire with others to see if the miss moves, but it does not. I removed upper intake and fuel rail, pressured up ...
November 12, 2009
1997 Chevrolet Blazer LS 4.3L Hesitation, Cuts out VIN: 1GNDT13W0V
P0300: Multiple Cylinder Misfire Detected. Hmm, need some help here guys- got a drivability problem that seems unusuial. When cold first up in the morning- vehicle hesitates when leaving a stop light on a light acceleration. If i accelerate hard it will not do it. Once the vehicle is completley warmed ...
November 13, 2009
2003 Jeep Grand Cherokee Laredo 4.0L Surge, Misfire, power loss VIN: 1J4GN48S53
P0300: Multiple Misfire Detected. Sometimes this Jeep will run normally at in-town speeds. It often looses power on the highway and won't go faster than 100 km/hr. It doesnt want to rev much past 3200. If you mash the gas pedal, it will bog severely and refuse to go past 4000 rpm and the CEL f...
November 13, 2009
2004 Toyota Sienna LE 3.3L MIL Lamp on VIN: 5TDZA23C84
P0300: Multiple Cylinder Misfire Detected. ... MIL light on drives good. pull code p0300 thru p0306. replaced all coils oem. shipped now back same codes . this so called misfireing only happens at 60+mph speeds and will flash the MIL light, but on test drive watching mi...
November 13, 2009
2002 GMC Sierra 1500 SL 5.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 2GTEK19T42
P0300: Multiple Cylinder Misfire Detected. wiil not accept cam and crak relearn
November 14, 2009
2000 Chevrolet Blazer LS 4.3L Misfire VIN: 1GNCT18WXY
P0300: Multiple Cylinder Misfire Detected. vehicle missfires on heavy acceleration. very intermittant and seems to only misfire on cyl 4 and 3
November 17, 2009
2003 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNEK13T13
P0300: Multiple Cylinder Misfire Detected. Complaint is missing at idle, with check engine light on & flashing @ times. Scan tested with tech2 & seen #8 misfiring bad under 1200 rpm, & #7 about 1/2 misfires of #8. All other cylinders ok. Spark is excellant to cylinders(tried 2 diff plugs, c...
November 17, 2009
2001 Mercedes-Benz S600 5.8L Poor Idle Quality, MIL Lamp on
P0300: random cyl misfire. head work done 5 months ago.car ran great.now that tech is gone & car dumped in my lap.sorry for crying.always misfires at idle only on driver side bank only,which led me to believe it was the coil assemly.but of course you can't test.it reduced misfires o...
November 18, 2009
1999 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEC13R6X
P0300: Multiple Cylinder Misfire Detected. This tahoe has had new plug's ,wire's cap&rotor by the owner to try to correct the problem. The misfire is on cyl's 3&5,I can not find any vacuum leak's ,I have changed the injectors {suggested by another shop} for those cyl's with no change.The spark ...
November 19, 2009
2005 Chevrolet Silverado 1500 LS 5.3L Poor Idle Quality, MIL Lamp on VIN: 1GCEK19B95
P0300: Multiple Cylinder Misfire Detected. ok guys this one is driving me crazy 2005 silverado w/5.3l. vehicle came in with complaint of running rough when cold. scanned vehicle and found misfires on #3 and 4 cylinders. checked compression on every cylinder and found 160lbs on all. checked for injecto...
November 20, 2009
2006 Dodge Ram 1500 Truck ST 4.7L Excessive Emissions, Cuts out, Misfire, MIL Lamp on VIN: 1D7HA18N96
P0300: Multiple Misfire Detected. hey guys, got this dodge pick up that a friend of mine has in his shop. customer was having problems with it and decided to fix it himself. he was having misfire and hesitation issues with it and decided to throw new plugs and all new coils at it. my friends s...
November 20, 2009
2006 Dodge Ram 1500 Truck ST 4.7L Excessive Emissions, Cuts out, Misfire, MIL Lamp on VIN: 1D7HA18N96
P0300: Multiple Misfire Detected. hey guys, got this dodge pick up that a friend of mine has in his shop. customer was having problems with it and decided to fix it himself. he was having misfire and hesitation issues with it and decided to throw new plugs and all new coils at it. my friends s...
November 21, 2009
2004 Dodge Durango Limited 5.7L Misfire VIN: 1D4HB58D24
P0300: Multiple Misfire Detected. Truck is misfiring, random misfire code P0300 is the only code that comes up. Data shows misfires on cylinders 1, 3, 5, and 7. Thought this was a no brainer and removed bank 1 converter. Started it up, still misfiring same as befor on same cylinders. I have no...
November 24, 2009
1998 Saturn SC2 1.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G8ZG1278W
P0300: Random Misfire Detected. hey people i have this saturn that has a miss on 2and 3 on accel and 4 on deccel, it has new plugs wires and good module, has good fuel pressure and no leak down the fuel trims are out to lunch (-30%) could any body tell me if the 02 is capable of causeing thi...
November 26, 2009
1999 Chrysler LHS 3.5L No Start, Stall VIN: 2C3HC56G0X
P0300: Multiple Cylinder Misfire Detected. ... hot only when cust. is driving . Of course by the time car is towed , will start and run well . While charging my scope battery , I decided to look at freeze frame . Showed p0300 , 0 RPM , minus -40 deg. coolant and negi...
November 27, 2009
2001 Mazda Protege ES 2.0L Misfire, MIL Lamp on
P0300: Multiple Misfire Detected. ... of town customer leaving me no time to diagnose. Two months ago the vehicle had P0420 another tech suggest cat replacement and the 96k service, also replaced o2 sensors as well as cat. Now customer returned with P0300 an...
November 27, 2009
2002 Oldsmobile Alero GL 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3NK52F32
P0300: Multiple Cylinder Misfire Detected. When this car idles it shows missfires on all cyclinders. #2 and #4 are the worse. Engine idles a little rought but does not backfire or pop. Above idle car runs fine. Will only set po300 code. Have clean throttle body, iac ports, replaced ignition system as a...
November 29, 2009
2000 Ford Taurus SE 4-Valve 3.0L Misfire, MIL Lamp on VIN: 1FAFP56SXY
P0300: misfire. Hello This Taurus runs good 90% of the tine. Then it will develop a severe lack of power, as it runs on 3 cylinders. It runs on only 1,2,and3 when it messes up. The engine light will flash, suddenly it straightens out and runs great. It has COP, and when it w...
November 30, 2009
2002 Oldsmobile Alero GL 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3NK52F32
P0300: Multiple Cylinder Misfire Detected. When this car idles it shows missfires on all cyclinders. #2 and #4 are the worse. Engine idles a little rought but does not backfire or pop. Above idle car runs fine. Will only set po300 code. Have clean throttle body, iac ports, replaced ignition system as a...
November 30, 2009