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P0300 Diagnostic Trouble Code Discussion for September 2006

Multiple Misfire Detected


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Trouble Ticket Help Requests for DTC P0300
Help Request Posted
1997 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP52K3V
P0300: Engine Misfire Detected. We have swapped injectors, coils, plugs and wires. Running compression shows around 80 psi on good cylinders, only 50 psi on affected cylinders. I'm leaning towards a cooked engine, but others remain unconvinced. Any ideas would be appreciated.
September 01, 2006
1999 Chevrolet Express 3500 5.7L Misfire VIN: 1GCHG39R9X
P0300: Multiple Cylinder Misfire Detected. truck came in with an engine missfire both at idle and under load. Secondary ignition was worn out so we did a maintenance tune up on the truck including cap, rotor, plugs, wires and filters. After tune we still had idle miss and fuel trim was high on right ba...
September 01, 2006
1997 Buick Park Avenue Ultra 3.8L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G4CU5212V
P0300: Engine Misfire Detected. ... ENGINE LIGHT ON AND NO POWER. HAD A P0300 SET WITH MISFIRES RECORDED ON ALL CYLINDERS. DURING A ROAD TEST UNDER HARD ACCELERATION THE ENGINE WOULD PING SO BAD IT SOUNDED LIKE IT WAS COMING APART. THE FIRST THING I FOUND WAS A MASSIVE VACUUM LEAK AT THE REA...
September 02, 2006
1998 Buick LeSabre Custom 3.8L Poor Idle Quality VIN: 1G4HP52K4W
P0300: Engine Misfire Detected. Hi, this car has a high idle. Previously at another shop, upper intake was replaced due to over heating and white smoke coming from tailpipe. Customer comes to us two days later for a high idle. After checking codes all it showed was a cyl 1 misfire. Check for...
September 04, 2006
2000 Mercedes-Benz ML320 3.2L Hesitation, Misfire, MIL Lamp on VIN: 4JGAB54E6Y
P0300: Random misfires. Car came in with cylinders 4, 5, 6 catalyst damaging misfires. Will only occur cold and during post start but not when warm. When accelerating from a stop either with light pedal pressure or WOT, check engine light comes on and flashes, engine runs very rough....
September 06, 2006
2002 Chevrolet Silverado 3500 8.1L Hesitation, Misfire VIN: 1GCJC39G32
P0300: Multiple Cylinder Misfire Detected. Hi everyone, thanks for taking the time to help me out. This truck is primarily used to tow RV's all over the country. This thing will exhibit a misfire under load at or above 3500 rpm. When this occurs, the motor makes a vibration noise similar to a heat shie...
September 07, 2006
2002 Chevrolet Silverado 3500 8.1L Hesitation, Misfire VIN: 1GCJC39G32
P0300: Multiple Cylinder Misfire Detected. Hi everyone, thanks for taking the time to help me out. This truck is primarily used to tow RV's all over the country. This thing will exhibit a misfire under load at or above 3500 rpm. When this occurs, the motor makes a vibration noise similar to a heat shie...
September 08, 2006
1998 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 3G2JB1246W
P0300: Multiple Engine Misfire Detected. Good Day, Folks! While idling in the shop and watching the scan tool data, the injector pulse width intermittantly will jump up to over 8ms, (from around 2.5ms @ normal idle) This occurs WITH NO CHANGE IN ALL OTHER DATA such as MAP, ECT, TPS etc. This naturall...
September 08, 2006
2003 GMC Yukon XL 1500 SLE 5.3L Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on, spark knock VIN: 1GKFK16Z43
P0300: Multiple Cylinder Misfire Detected. vechicle came in for at with 60794 miles on it for a maintnece flush on trans and fuel filter replacement, oil change and balance of tires. after the truck left the customer drove a few short miles and the check engine lgith came on and started to missfire. he...
September 11, 2006
1997 Chevrolet K1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 2GCEK19R7V
P0300: Multiple Cylinder Misfire Detected. This truck has a misfire under light load, usually when going up a slight grade, when rpm is between 1500 and 2000. According to my Snap-On Solus, cylinder #5 is misfiring. Although they have been replaced I tried swapping the spark plug and wire, no change. F...
September 12, 2006
1997 Chevrolet K1500 5.7L Cuts out, Misfire, MIL Lamp on
P0300: Multiple Cylinder Misfire Detected. vehidle came in for fuel pump did that it runs fine untill it is put under a load like climbing a hill on the interstate. Then it starts misfireing on all cylinders number 4 and 8 mis most. cap rotor plugs wires all new coil checks out ok runs fine on flat gro...
September 12, 2006
2001 Dodge Intrepid SE 2.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 2B3HD46RX1
P0300: Multiple Cylinder Misfire Detected. This car came to my shop with check engine light on . complaint of misfire runs rough at idle and upon accelleration and surge when running down the road at cruise speeds. I hooked scanner to the car found code po355 coil #5 cyl. coil current problem. I ran cu...
September 12, 2006
2002 Mazda MPV LS 3.0L Misfire, MIL Lamp on VIN: JM3LW28A42
P0300: Multiple Misfire Detected. Have an 02 mpv with a misfire , under load w/brake torque will miss and backfire . Have good fuel pressure , compression, all coils scope good , replaced plugs , read all previus posts on subject , checked for bad harness out of pcm , idles like a kitten , eve...
September 12, 2006
1997 Saturn SL2 1.9L Surge VIN: 1G8ZJ5272V
P0300: Random Misfire Detected. Found POS battery cable loose, causing a no crank/no start. Cleared codes and drove for 15 mi no codes came back. Car has flat spot/ EGR surge when EGR is opening about 1/4 to 3/4 throttle, EGR voltage and % match on scanner.When I unplug EGR car runs good. Ha...
September 12, 2006
2000 Buick Regal LS 3.8L Misfire, MIL Lamp on VIN: 2G4WB55K02
P0300: Engine Misfire Detected. ... this miss fire code, but,,, p0300 ignition miss fire is cylinder number 4 only. client came from the gm dealer they installed new wires and plugs, did not cure the problem. now i have the car. miss fire data is literally off the chart for cylinder 4. swapp...
September 13, 2006
2002 Chevrolet Tahoe LS 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEK13ZX2
P0300: Multiple Cylinder Misfire Detected. ... dealer. The MIL is on with a P0300 random missfire code. Scan data shows cylinder 3 to be missfiring badly and cylinder 1 occasionlly. Cylinder #1 seams to only miss when cold but #3 missfires almost all the time. I swapped the plug, wire, and coil with cy...
September 13, 2006
2000 GMC Jimmy Diamond Edition 4.3L Excessive Emissions, Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GKDT13WXY
P0300: Multiple Cylinder Misfire Detected. Hello all. This Jimmy is trying my patiance. It will start & idle normal for the first 2-3 min then B1 O2 heads towards it comfort zone of 3mv with no movement and ST fuel trim goes to 192. B2 is going a little lean to compensate ST FT 117. B1 is dumping f...
September 13, 2006
1999 Oldsmobile Aurora 4.0L Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G3GR62C5X
P0300: Multiple Cylinder Misfire Detected. ... months ago for a miss. found to be cylinder #6. replaced the spark plugs and did a motor vac. the car ran fine. previous to us someone else had replaced the wires and we could see where one was burn on the valve cover at #6. car came back last week for sta...
September 13, 2006
2002 Saturn Vue 3.0L MIL Lamp on VIN: 5GZCZ63B32
P0300: Random Misfire Detected. This Saturn was a drive by scanning with an appointment for next monday. I am writing because this is the first time I have encountered this engine and do not know a lot about it. The customer stated that about 1.5 years ago the pcv hose froze up and caused th...
September 13, 2006
2000 Daewoo Lanos SX 1.6L MIL Lamp on VIN: KLATC5263Y
P0300: Random misfire. ... repair road-test, MIL illuminates and sets a P0303. Upon clearing code, P0300 illuminates. These codes will alternate. They will only set when vehicle is accelerated hard. If the code is cleared and the vehicle is only acce...
September 14, 2006
2003 Mitsubishi Lancer ES 2.0L Poor Idle Quality, Misfire, MIL Lamp on
P0300: Random Misfire Detected. ... Rally Edition. Car originally came in for a MIL light on and engine rpm would sometimes roll up and down. Found 3 codes. P0335 crankshaft position sensor. P0340 camshaft position sensor. P0300 Random/multiple misfire detected. Used vantage pro to verify ca...
September 14, 2006
1998 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 3G2JB1246W
P0300: Multiple Engine Misfire Detected. Good Day, Folks! While idling in the shop and watching the scan tool data, the injector pulse width intermittantly will jump up to over 8ms, (from around 2.5ms @ normal idle) This occurs WITH NO CHANGE IN ALL OTHER DATA such as MAP, ECT, TPS etc. This naturall...
September 14, 2006
1997 Chevrolet S10 2.2L Poor Idle Quality VIN: 1GCCS1445V
P0300: Multiple Engine Misfire Detected. ... I have the NAPA delivery truck that was towed in for a no start a few weeks ago. It was out of time so I removed the front timing cover and the chain was broken. replaced the chain and gear set. The truck started but ran very poorly at idle. The engine had...
September 15, 2006
1996 Chevrolet S10 LS 4.3L Excessive Emissions, Misfire, MIL Lamp on VIN: 1GCCS14X6T
P0300: Multiple Engine Misfire Detected. been to 2 different shops and here we are. when first started engine is somewhat smooth for about 10 seconds and then it picks up a multiple cylinder missfire. under a load it becomes real bad on cylinders 3,4,and 6.the only code showing up is po300. all tune ...
September 18, 2006
1996 Chevrolet S10 LS 4.3L Excessive Emissions, Misfire, MIL Lamp on VIN: 1GCCS14X6T
P0300: Multiple Engine Misfire Detected. been to 2 different shops and here we are. when first started engine is somewhat smooth for about 10 seconds and then it picks up a multiple cylinder missfire. under a load it becomes real bad on cylinders 3,4,and 6.the only code showing up is po300. all tune ...
September 20, 2006
1996 Saturn SL 1.9L Misfire, MIL Lamp on VIN: 1G8ZF5281T
P0300: Random Misfire Detected. Seemed pretty straight forward, have seen numerous misfire codes on dohc 1.9's but this is the first sohc. customer let car sit for 3 years! Wants to bring it back to life. Found bosch platinium plugs, replaced with ngk. Replaced wires as well (delco). I have ...
September 20, 2006
2000 Saab 9-5 2.3t 2.3L Long Cranking VIN: YS3ED48E8Y
P0300: without check engine light only on the last visit. was not stored on the 1st visit. ... car. No rough idle or running problems. Complaining of intermittent long cranking (5 seconds or longer) mostly on first start of the day but also acts-up after it is sitting for many hours. We had the car in for 3-4 days and were able to confirm this. S...
September 24, 2006
2001 Chevrolet Express 1500 5.0L MIL Lamp on VIN: 1GBFG15M41
P0300: Multiple Cylinder Misfire Detected. Please help me! van came in from a side of the road car lot where one of their guys replaced the following to get rid of #4 cylinder misfiring. plugs,wires,#4 fuel injector from advaced auto, fuel filter, and the cam sensor. When I got it the distributor was...
September 25, 2006
1996 Pontiac Sunfire SE 2.2L Misfire, MIL Lamp on VIN: 3G2JB5240T
P0300: Multiple Engine Misfire Detected. ... motor in a 96 sunfire. After replacement, the SES light comes on and either code P0300 or P0335 when ever the engine is accelerated. There is no detectable misfire but the scanner confirms misfires on cys 1 and 4 as the eng...
September 26, 2006
2002 Porsche 911 Carrera 3.6L Poor Idle Quality, MIL Lamp on VIN: WP0CA29922
P0300: Misfire detection. This car idles rough but is smooth above idle. There was fluid spiting from the rh (cyl 1-3) exhaust and it had a strong (hot) coolant smell when it first came back. I did not drive this car before the clutch work so of course Customer says it was fine before....
September 26, 2006
2001 Chevrolet Silverado 1500 5.3L Misfire, MIL Lamp on VIN: 2GCEK19TX1
P0300: Multiple Cylinder Misfire Detected. Vehicle has an intermitting misfire on cylinder #7. Replaced plugs and wires. Still had misfire #7 via scan tool readings. Replaced #7 coil, still had misfire. The only thing adnormal I can see about my scope pattern is a slightly high firing line on #7. The c...
September 27, 2006
1998 Chevrolet Cavalier LS 2.4L Poor Idle Quality, Surge, Misfire VIN: 1G1JF52T9W
P0300: Multiple Engine Misfire Detected. Well here goes, I received this vehicle with a blown engine, I procured enough new engine parts to build a new engine, slapped it in and here we are. The engine has a rough idle the MAP is 42-48 kPa hot with misfire occurring on all cylinders. Since I didn't h...
September 28, 2006
2001 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Misfire VIN: 1GCHK24U11
P0300: Multiple Cylinder Misfire Detected. this truck is only used about twice a month. one day it started running poorly after sitting for a week. i replaced worn plugs and wires, fuel filter, and flushed fuel injectors and rail. the fuel trims are all within 2% of 0, there are no cylinders that seem ...
September 28, 2006
2005 Mercury Sable GS 3.0L Limp Mode VIN: 1MEFM50U15
P0300: Random missfire. Went to another shop and borrowed MATCO scanner, Codes above. Cleared codes and then test drove. Runs great, but only 1st. Back at my shop, X-ray works "no codes", snappy "no comm." So I try again with X-ray "P0606 controller/PCM failure...
September 28, 2006
2000 Chevrolet Express 2500 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCFG25R2Y
P0300: Multiple Cylinder Misfire Detected. Engine continues to misfire and set the P0300 DTC. Cylinder four misses the most then cylinder eight then cylinder two and then cylinder six. Misfires are only on bank two. Check for vacuum leaks and repaired a 7/32 line on bank one at PCV valve. No other vacu...
September 29, 2006