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P0300 Diagnostic Trouble Code Discussion for October 2010

Multiple Misfire Detected


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Trouble Ticket Help Requests for DTC P0300
Help Request Posted
2004 Mazda B4000 4.0L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 4F4YR46E54
P0300: Multiple Misfire Detected. Hi fellow Mazda techs. MIL flashing when vehicle came in. Hooked up IDS and found those codes. Data logger shows O2 precat fluctuating OK, O2S12 .91V steady and O2S22 .75V steady. LTFT bank 1 -15% and LTFT bank 2 25%. And then all of a sudden all lines on IDS ...
October 01, 2010
2001 Volkswagen Passat GLS 1.8L Misfire, cold 30sec to 1 min VIN: WVWVD63B81
P0300: randim miss. miss wene cold for 30sec to one min thene runs good no miss rr coils and plugs. ect and maf is good! ecu? or ecu reflash is need??
October 01, 2010
1999 Saab 9-5 3.0L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: YS3EF48Z8X
P0300: Random misfire detcted. Hi everybody and thanks in advance for your help. This vehicle has 2 problems, first one, car came in blowing smoke like crazy I mean a huge cloud behind it and second problem rough idle with MIL on. So I found out that the turbo was leaking oil really bad not...
October 05, 2010
2001 Chevrolet Silverado 1500 4.3L Misfire, MIL Lamp on VIN: 1GCEC149W1
P0300: Multiple Cylinder Misfire Detected. Guys this one is driving me nuts. I have good fuel presure I think. My guage is bad but reads about 50lbs at idle, I know its supposed to be 60 but thats not that short. I have smoke tested this thing for vacuum leaks and didnt find any. I have a missfire on c...
October 06, 2010
2003 Chevrolet Silverado 2500 HD 6.0L Stall, Misfire, MIL Lamp on VIN: 1GCHK23U43
P0300: Multiple Engine Misfire Detected. Intermittent stall. Have been unable to duplicate customer complaint at various speeds, decel, loads, etc. O2 sensor is indeed very lazy, only occasionally will it vary from 450mV, even with butane enrichment or simulating lean condition. Fuel regulator not le...
October 06, 2010
1999 Volkswagen Beetle GL 2.0L Poor Idle Quality, Hesitation, Misfire VIN: 3VWCC21C4X
P0300: Randon misfire. Car came in barely running, with multiple misfire codes. Has codes for all cyl misfiring. Champion spark plugs that were replaced 50 miles ago fouled out. Ign coil also tested bad.we replaced plugs with ngk platinums, and ign coil. Cleared codes, but after run...
October 06, 2010
2001 Chevrolet Silverado 1500 4.3L Misfire, MIL Lamp on VIN: 1GCEC149W1
P0300: Multiple Cylinder Misfire Detected. Guys this one is driving me nuts. I have good fuel presure I think. My guage is bad but reads about 50lbs at idle, I know its supposed to be 60 but thats not that short. I have smoke tested this thing for vacuum leaks and didnt find any. I have a missfire on c...
October 07, 2010
1999 Lexus ES300 3.0L MIL Lamp on VIN: JT8BF28G6X
P0300: Multiple Cylinder Misfire Detected. ... P0302 P0300 MISFIRE CODES SPECIFIC TO CYLINDERS P0125 ERROR CODE P0120 TPS CODE. We replaced the coils (all six) and plugs. After the road test the Car recoded with a P0125. This is NOT a coola...
October 07, 2010
1997 Chevrolet S10 4.3L Excessive Emissions, Poor Idle Quality, Stall, Misfire, Poor Fuel Economy VIN: 1GCDT19XXV
P0300: Multiple Engine Misfire Detected. ... motor. 4 months ago i did plugs wires cap and rotor. the truck has a bad misfire at idle and almost is undrivable it stalls all the time. i checked codes and had a p0300 and a p0337 for crank sensor so i changed the crank sensor. the truck idle better but ...
October 09, 2010
2000 Chevrolet Express 2500 5.0L Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on
P0300: Multiple Cylinder Misfire Detected. ... engine soon light on. Codes were p0300 and p0306. The plugs, wires, cap, rotor, were replaced. Checking misfire data on my scan tool afterwards cyl. 6 still would misfire when van ran under 1000 rpm all fuel inj was repl...
October 11, 2010
1998 Mercedes-Benz ML320 3.2L Misfire VIN: 4JGAB54E5W
P0300: Multible Missfires. When testing, right now the only thing I find wrong is that injector Cyl 3 and Cyl 6 are not fired by the ECU. There is power at both of these injectors. The question is why are these 2 Injectors shut off. I understand that the ECU can selectively shut down an...
October 11, 2010
2001 Chevrolet Silverado 1500 4.8L Misfire, MIL Lamp on VIN: 1GCEK14V0I
P0300: Multiple Cylinder Misfire Detected. Vehicle was driven into shop. Customer states CEL comes on for short periods intermittently. Used SOLUS-PRO Scanner to retrieve codes. I believe Mis-Fire & EGR Codes are a separate issue. Could a faulty EGR be the cause of an engine Mis-fire? The Scan tool...
October 12, 2010
2001 GMC Savana 1500 5.7L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GTFG15R9Y
P0300: Multiple Cylinder Misfire Detected. Engine missing at Idle. cylinders 7 and 3. Not loaded and high RMP's engine runs fine. On Hwy under load occasonal loss of power seems to run better with heater on high. Fuel ECO Sucks Codes were: Bank 2 Lean Cylinders 7 and 3 misfire No Intake leakes teste...
October 12, 2010
1998 Mercedes-Benz ML320 3.2L Misfire VIN: 4JGAB54E5W
P0300: Multible Missfires. When testing, right now the only thing I find wrong is that injector Cyl 3 and Cyl 6 are not fired by the ECU. There is power at both of these injectors. The question is why are these 2 Injectors shut off. I understand that the ECU can selectively shut down an...
October 12, 2010
1997 Chevrolet S10 4.3L Excessive Emissions, Poor Idle Quality, Stall, Misfire, Poor Fuel Economy VIN: 1GCDT19XXV
P0300: Multiple Engine Misfire Detected. ... motor. 4 months ago i did plugs wires cap and rotor. the truck has a bad misfire at idle and almost is undrivable it stalls all the time. i checked codes and had a p0300 and a p0337 for crank sensor so i changed the crank sensor. the truck idle better but ...
October 13, 2010
2001 Chevrolet Silverado 2500 HD 6.0L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCHK29U81
P0300: Multiple Cylinder Misfire Detected. Current problem is missfire cylinder # 1&5 and 4&8 at hwy speeds between 80km-100km under load. Fuel pressure is 60 p.s.i. Switched coils and still had the same cylinders missfire.
October 13, 2010
2008 Ford E-350 Super Duty 5.4L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FDSF31588
P0300: Random multiple misfire. Hi we have this truck we have changed the fuel rail pressure sensor and catalytic converters both with oe parts and we have bog down when accelerator pedal is to floor if you let up 1/2 inch it runs fine however you have no pass gear
October 13, 2010
2006 Chevrolet Silverado 2500 HD LT 6.6L Poor Idle Quality, Misfire VIN: 1GCHK23276
P0300: Multiple Engine Misfire Detected. Hi every one i have this daramax that runs very poor.i do not know the daramax very well my bal rate for each cyl is #1 -4.7 #2-4.0 #3 12.3 #4 12.0 #5 -2.9 #6 -4.0 #7 2.5 #8 -4.0 at idle it smokes and beraly runs if anybody can help i thankyou and have a good ...
October 14, 2010
2005 Chevrolet Silverado 2500 HD 6.0L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCH1629VX
P0300: Multiple Engine Misfire Detected. Hello techs, I have a problem that I'm pulling my hair out and could use your help with. This chevy pick up misfires intermittently on cylinders 2,4, and 8. When looking at misfire graph with the tech 2 it mostly misfires on 8 and 4 most of the time intermitte...
October 15, 2010
1996 GMC Safari SL 4.3L Misfire, MIL Lamp on
P0300: Multiple Cylinder Misfire Detected. Thanks for any replies in advance. I have this GMC Safari thats killing me. At idle this van will show misfires counting on cylinder #5 sometimes. When the rpm hits about 1800 cylinder 5 stops misfiring then all other cylinders start missing. Checked fuel pres...
October 15, 2010
2000 GMC Sierra 1500 SLT 5.3L Misfire VIN: 1GTEK19T1Y
P0300: Multiple Cylinder Misfire Detected. ... flashing previously but not now). Road tested and light misfire under load at 2500+ rpm's. Fault code p0300 and misfires on #5 and #8 cylinders but only at 2500 rpm or more. Truck runs fine. good power, highway drive is fine, etc... Swaped #1 & #3 pl...
October 15, 2010
1997 Chevrolet Camaro 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2G1FP22K3V
P0300: Multiple Engine Misfire Detected. ... vehicle came in barely running and missing terribly. Would die randomly. Only code in PCM was P0300. First thing was to check coil output and injector pulse. Both were good. Pulled plugs and found #4 plug tip missing and electrode gone. Also found two plug...
October 18, 2010
2000 Chevrolet Astro 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCDM19W6Y
P0300: Multiple Cylinder Misfire Detected. hi all tech. this car came in poor idling.but accelerate is fine no misfire . code p 300 random misfre. check monitor number 3 and 6 misfire. comression ok,no vacumn leak. i had replace evrything and rand out of idea. please help i appreciate. thanks
October 18, 2010
2005 Chevrolet Silverado 2500 HD 6.0L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCH1629VX
P0300: Multiple Engine Misfire Detected. Hello techs, I have a problem that I'm pulling my hair out and could use your help with. This chevy pick up misfires intermittently on cylinders 2,4, and 8. When looking at misfire graph with the tech 2 it mostly misfires on 8 and 4 most of the time intermitte...
October 18, 2010
2002 Mazda Protege ES 2.0L Misfire, MIL Lamp on VIN: JM1BJ22572
P0300: Multiple Misfire Detected. ... random, while driving the vehicles does not jerk backfire or do any normal misfire tactics, nor at idle with brake on and in gear accel pedal to floor no misfire from engine. the code reappears while driving, but no noticeable misfire occurs, or shudder/sh...
October 18, 2010
1997 Chevrolet Camaro 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2G1FP22K3V
P0300: Multiple Engine Misfire Detected. ... vehicle came in barely running and missing terribly. Would die randomly. Only code in PCM was P0300. First thing was to check coil output and injector pulse. Both were good. Pulled plugs and found #4 plug tip missing and electrode gone. Also found two plug...
October 19, 2010
2000 Audi A6 Quattro 4.2L Misfire, MIL Lamp on VIN: WAUZL54B3Y
P0300: Random cyl. misfire detected. ... Intermittent (getting more frequent) vehicle will run very rough after starting, MIL flashing, will set P0303, and sometimes will be accompanied by P0300. #3 coil replaced, have swapped injector, swapped new coil to other bank, swapped spark plug, to no av...
October 20, 2010
2002 Mazda Protege ES 2.0L Misfire, MIL Lamp on VIN: JM1BJ22572
P0300: Multiple Misfire Detected. ... random, while driving the vehicles does not jerk backfire or do any normal misfire tactics, nor at idle with brake on and in gear accel pedal to floor no misfire from engine. the code reappears while driving, but no noticeable misfire occurs, or shudder/sh...
October 20, 2010
2003 Audi A6 Quattro 4.2L Poor Idle Quality, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: WAUML64B03
P0300: Random Misfire. ... battery, upon start up engine had noise, appears to come from inside the intake. After the chain tensioners and valve cover gaskets, no codes but cam crank correlation and misfire p0300-p0303 pu...
October 21, 2010
2002 Dodge Caravan SE 3.3L Misfire, MIL Lamp on VIN: 1B4GP25302
P0300: Multiple Cylinder Misfire Detected. Vehicle came in with a head gasket leak. We sent heads to machine shop where they milled and vacuum tested the heads. We replaced the gaskets, and due to the misfires in cylinders 1 and 5, we have replaced all spark plugs, ignition wires, and coil. Where do we...
October 21, 2010
2000 Audi A6 Quattro 4.2L Misfire, MIL Lamp on VIN: WAUZL54B3Y
P0300: Random cyl. misfire detected. ... Intermittent (getting more frequent) vehicle will run very rough after starting, MIL flashing, will set P0303, and sometimes will be accompanied by P0300. #3 coil replaced, have swapped injector, swapped new coil to other bank, swapped spark plug, to no av...
October 22, 2010
2003 GMC Yukon Denali 6.0L Misfire VIN: 1GKEK63U03
P0300: Multiple Cylinder Misfire Detected. came in with poor power complaint test and replaced bank 1 rear o2 sensor , Vehicle ran perfect for 2 days. Customer complained of no power towed in to shop, scaned computer and miss fire was on pass bank 2468 cylinders Good spark , injector pulse with , good ...
October 22, 2010
2003 Toyota Prius 1.5L Hesitation, Misfire, MIL Lamp on VIN: JT2BK18U13
P0300: Multiple Cylinder Misfire Detected. Hey out there in IATN land, My one hybrid customer is elderly and came in all upset that her 'triangle of death' was on along with the CEL and the car was lacking power and started hard. I found the po300 and the code cleared and the car started up normally an...
October 25, 2010
1999 Chrysler Sebring JXi 2.5L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Misfire, MIL Lamp on VIN: 3C3EL55H9X
P0300: Multiple Cylinder Misfire Detected. Greeting fellow techs. I have here a troublesome vehicle. It has been deteriorating gradually for the last 6 months. When you first start the car in the morning it runs like a top! smooth idle smooth power on the road. After 10 minutes the engine begins to mis...
October 27, 2010
2006 Kia Sedona LX 3.8L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: KNDMB23386
P0300: Multiple Misfire Detected. Hey guys, got a 2006 Kia Sedona van here. Came in with 9 total codes stored, most for lean running conditions on both banks due to a ripped air intake boot. I have cleared codes and replaced the boot, but I have an interesting problem. I'm getting a cam/crank ...
October 27, 2010
1994 Oldsmobile 88 Royale 3.8L Misfire VIN: 1G3HY521LR
P0300: 3 6 coil not firing at idle but at high rpm coil starts working all other coils working all the time crank sensor and ignition module have been replaced. The coil for #3 & #6 not working at idle, both other coils working, coil will start to work at high rpm's, igniton module and crank sensor have been replaced.
October 27, 2010
1997 Chevrolet K1500 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEK1973V
P0300: Multiple Cylinder Misfire Detected. Truck came in with customer complaint of long crank time to start engine.Fuel pressure was 52 psi cranking, scoped pump current,pump pattern was aweful and pump was running 2100 rpm, replace fuel pump with a new Delphi pump and strainer, also replaced main fue...
October 30, 2010
2001 Chevrolet Suburban 1500 LT 5.3L Misfire VIN: 3GNFK16T81
P0300: Multiple Cylinder Misfire Detected. Vehicle came to shop engine light on dtc po300 random misfire replace all plug and short plugs wire also ckecked missfire dta # 6 and # 8 high miss fire count replace coils on # 6 and # 8 took care prblem ran compression reading # 6 showing 5o psi engine runni...
October 30, 2010
2001 Chevrolet Malibu 3.1L Poor Idle Quality, Hesitation, Misfire VIN: 1G1ND52J21
P0300: Multiple Cylinder Misfire Detected. I tore it down to cylinder heads-found intake gaskets bad. purchase upper set & replaced head gaskets, valve stem seals, intake gaskets. Upon initial start-up 1 rocker was noisy. Had to install Healy coil. Car drove great for 1 week. Filled up gas tank and...
October 30, 2010
1997 Chevrolet K1500 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEK1973V
P0300: Multiple Cylinder Misfire Detected. Truck came in with customer complaint of long crank time to start engine.Fuel pressure was 52 psi cranking, scoped pump current,pump pattern was aweful and pump was running 2100 rpm, replace fuel pump with a new Delphi pump and strainer, also replaced main fue...
October 31, 2010