Join Now
International Automotive Technicians Network

P0300 Diagnostic Trouble Code Discussion for November 2005

Multiple Misfire Detected


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0300
Help Request Posted
1997 Lexus ES300 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: JT8BF22G8V
P0300: Multiple Cylinder Misfire Detected. Customer brought vehicle in for a maintenance timing belt and water pump. After completion vehicle was test driven and returned to customer. The customer returned 2 days later complaining of a check engine light. Codes were pulled and sure enough all the cylin...
November 01, 2005
1997 Chevrolet Express 1500 LS 4.3L MIL Lamp on VIN: 1GNFG15W4V
P0300: Multiple Cylinder Misfire Detected. ... week ago the service engine soon light came on and the vehicle began to run a bit rough and then it ran fine but the light stayed on. Our initial testing shows a code P0300, and vehicle tests drives fine. I double checked the tune up parts and ignition ca...
November 02, 2005
1997 Pontiac Bonneville SE 3.8L Misfire, MIL Lamp on VIN: SVH2144671
P0300: Engine Misfire Detected. any body out there ran into this before ,please help gm tech.
November 02, 2005
2002 Acura MDX Touring 3.5L Misfire, MIL Lamp on VIN: 2HNYD186X2
P0300: Random Misfire Detected. Good evening, The customer complaint is intermittant misfire, mostly in the AM, pointing downhiil in his steep driveway. When it happens, the MIL and VTM lights come on, and multiple codes set.(see code descriptions) We have not been able to experience this ye...
November 03, 2005
1997 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1G4HP52K3V
P0300: Engine Misfire Detected. ... & surging when cold with the MIL lite on. Customer brought vehicle to a "tune-up" shop and they installed AC Delco 14 plugs and new wires. Vehicle still missfiring when cold and has codes P0171 and P0300. I found cylinders 2 and 4 ramping up m...
November 03, 2005
1996 Pontiac Bonneville SE 3.8L Misfire, MIL Lamp on VIN: 1G2HX52K5T
P0300: Engine Misfire Detected. Hello once again. I have this bonniville here and it won't pass emission because there is a misfire code. I originally had this car in for the upper intake leaking to the point that when they shut it off and tried starting it later it was locked up. Replaced i...
November 07, 2005
1997 Pontiac Trans Sport 3.4L Misfire VIN: 1GMDX03E5V
P0300: Multiple Cylinder Misfire Detected. Customer complains @ times on mostly cold starts, the SES light comes on and Definite Engine Misfire felt/detected. PO300 is the only DTC found, but this feels like it drops 2 or 3 cylinders w/SES on! After driving about 6 blocks SES out but can still feel a l...
November 07, 2005
1997 Buick Park Avenue 3.8L No Start VIN: 1G4W52K0V4
P0300: Engine Misfire Detected. Since then have substituted known good ign module, coils, cam, and crank sensor. Scoped cam, 3X and 18X crank signals.At times it sound as if the timing is off (backfiring in intake). Looking for any information known related to problems with the 3.8L . or ele...
November 08, 2005
2002 Chevrolet Suburban 2500 LT 6.0L No Start, Stall, Misfire, MIL Lamp on VIN: 3GNGK26U62
P0300: Multiple Cylinder Misfire Detected. upon initial inspection,found fuel pressure below specs @ 20psi.fuel gauge is reading 3/8 of a tank.when ignition is cycled there is batt voltage @ main fuel pump,pump runs,although there isnt enough pressure.droped main fuel tank,to visually check fuel level,...
November 08, 2005
1996 Chevrolet Tahoe LS 5.7L Misfire, MIL Lamp on VIN: 1GNEK13RXT
P0300: Multiple Cylinder Misfire Detected. It's Baaaack! Once again, #3 cycles, but does not flow! The poppet does not appear to be crudding up, and I checked for a poor connection at the CMPI plug by checking resistance between ECU 1 fuse and ECU connector C-1. (only .3 ohms above injector spec, and c...
November 10, 2005
1998 Chevrolet Blazer 4.3L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNT13W4W2
P0300: Multiple Cylinder Misfire Detected. Truck came in codes PO171, PO131,PO300, PO1870, and running rough. Found bank 1 sensor 1 dead and all plugs on that bank black. Replaced HO2S and did a major tune-up truck ran great. Came back 1 week later HO2 sensor dead again and plugs fouled. Replaced HO2S ...
November 14, 2005
1996 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5279T
P0300: Random Misfire Detected. ... It came to the shop and I found the missfire codes P0300 and P0303. I found the #3 spark plug tube full of oil. Replaced wires and plugs. When I erased the DTC memory, now the service light went on. Is this light the same...
November 14, 2005
1998 Chevrolet Blazer 4.3L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNT13W4W2
P0300: Multiple Cylinder Misfire Detected. Truck came in codes PO171, PO131,PO300, PO1870, and running rough. Found bank 1 sensor 1 dead and all plugs on that bank black. Replaced HO2S and did a major tune-up truck ran great. Came back 1 week later HO2 sensor dead again and plugs fouled. Replaced HO2S ...
November 15, 2005
1998 Dodge Ram 2500 Truck 5.9L Hesitation, Stall, Misfire VIN: 1LO552L521
P0300: Multiple Cylinder Misfire Detected. first test drive had ramdom misfire. Check fuel pressure and vacuum and volume,motor has slight misfire, no indication of secondary problem. After clearing codes had customer test drive and light came on , found number 6 misfire, than number 1, than number 5,k...
November 16, 2005
1996 Buick Regal Custom 3.8L Misfire, MIL Lamp on VIN: 2G4WB52K6T
P0300: Multiple Cylinder Misfire Detected. Hello fellow GM techs. I have this car that came into my shop yesterday with the SES and miss. Scan test found random misfire on #5 cylinder. Tested firng and does miss on #5. Test injectors with both amp tester and balance tested injectors-good, tested spark ...
November 17, 2005
2003 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Misfire VIN: 1GCHC29U33
P0300: Multiple Engine Misfire Detected. Got a strange one here. This 6.0 truck has a very rough idle and will even sometimes die. Missfires build up on all cylinders while idling but go away once you reach anything over 1400 rpm. The truck has plenty of power and drives fine off idle. We have repl...
November 18, 2005
2002 Nissan Sentra CA 1.8L Misfire, MIL Lamp on VIN: 3N1CB51D22
P0300: Multiple Misfire Detected. ... we check car over before purchase & noted check engine light not working, checked codes p0051, p0335 & p0300. customer decide to purchase vehicle, car lot was supposed to fix check engine light & codes, which t...
November 18, 2005
1996 Buick Regal Custom 3.8L Misfire, MIL Lamp on VIN: 2G4WB52K6T
P0300: Multiple Cylinder Misfire Detected. Hello fellow GM techs. I have this car that came into my shop yesterday with the SES and miss. Scan test found random misfire on #5 cylinder. Tested firng and does miss on #5. Test injectors with both amp tester and balance tested injectors-good, tested spark ...
November 21, 2005
1998 Cadillac Seville SLS 4.6L Misfire, MIL Lamp on VIN: 1G6KS54Y1W
P0300: Engine Misfire Detected. Hello All and thanks in advance for any help, I have found Iatn very helpful. I have this vehicle that has an ignition missfire on $1 cyl.(sorry no. sign key is bad). I have done what I think to be the preliminarys IE; swapped coils, comp. test, swapped inject...
November 21, 2005
2003 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Misfire VIN: 1GCHC29U33
P0300: Multiple Engine Misfire Detected. Got a strange one here. This 6.0 truck has a very rough idle and will even sometimes die. Missfires build up on all cylinders while idling but go away once you reach anything over 1400 rpm. The truck has plenty of power and drives fine off idle. We have repl...
November 21, 2005
2003 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 2GTEC19T23
P0300: Multiple Cylinder Misfire Detected. Truck came in running horrible. one of my techs looked at it for 2 hrs and gave up...it acts like a intake gasket leak or a stuck open egr valve, but has no egr valve. LT FUEL TRIM B1 11% & LT FUEL TRIM B2 -25%--misfires on cylinders 2,4,6,8---4 and 6 bein...
November 21, 2005
2000 Volkswagen Passat GLS 1.8L Misfire, MIL Lamp on VIN: WVWMA63B9Y
P0300: random missfire. help? ithink that i covered all bases. i have swapped injectors, injector wiring, new coils & plugs & swapped holes with each,put new fuel in tank,and all listed before. this car has a miss on #1. what am i missing? any help would be appreciated, and i...
November 21, 2005
1998 Chrysler Town & Country (Van) LXi 3.8L Misfire, MIL Lamp on VIN: 1C4GP64L4W
P0300: random misfire. ... on steady at idle. intermittently the light will flash while cruising or under load. scanned for codes and found p0300 random misfire. customer replaced plugs and wires before problem started. while watching scan data, we monitored misfire data and saw mis...
November 22, 2005
2000 Mazda Miata 1.8L Misfire, MIL Lamp on VIN: JM1NB3532Y
P0300: Random Misfire Detected. ... and 'check engine' came on . Code p0300 ,p0420. Misfire occured after hot soak(it act up to me once and I see no spark at coil on # 1 cyl ). I replaced a set of wire due to burn at cyl# 4. Gave car back to customer and he came back 4 weeks later with same ...
November 22, 2005
2000 Chevrolet Express 2500 5.0L Misfire VIN: 1GCFG25M0Y
P0300: Multiple Cylinder Misfire Detected. Hello all and thanks for the help. I have this van here with a misfire on #3 and #5. No spark on these 2 cylinders. Tune up parts were all original, distributor cap showed signs of carbon tracking, so I replaced plugs, cap, rotor and wires. Still no spark on 3...
November 23, 2005
1997 Mercedes-Benz C230 2.3L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 2020262F65
P0300: Random Missfirs. Hello, I hope someone can help or has seen this problem before. The car came in with what appeared to be all the indicators of an air mass sensor, based on fault codes. Replaced the plugs based on milage. Fitted new sensor - no better.Fault code #'s PO302 &...
November 23, 2005
2000 Volkswagen Passat GLS 1.8L Misfire, MIL Lamp on VIN: WVWMA63B9Y
P0300: random missfire. help? ithink that i covered all bases. i have swapped injectors, injector wiring, new coils & plugs & swapped holes with each,put new fuel in tank,and all listed before. this car has a miss on #1. what am i missing? any help would be appreciated, and i...
November 24, 2005
2001 Saturn L200 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G8JU52F21
P0300: Random Misfire Detected. Hello, I hope you can help. Vehicle was dropped off, with a rough idle, like it wants to stall. No cel @ this time. Checked for vacuum leak, found none. Inspected spark plugs, ignition system for signs of prob's, found none. the wierd thing is, the cooling fan...
November 25, 2005
2002 Jeep Grand Cherokee Laredo 4.0L Stall, Misfire, MIL Lamp on VIN: 1J4GW48S52
P0300: Multiple Cylinder Misfire Detected. Deer hunting season. My time off. So, my wife's car has the check eng light come on and then it starts flashing. Towed to shop (8 miles away) Test drive seems ok. erase codes. start up, codes don't reset. Replace plugs(original) with autolights gapped at 35 Al...
November 27, 2005
1997 Infiniti Q45 4.1L MIL Lamp on VIN: JNKBY31D7V
P0300: Multiple Misfire Detected. This one is very intermittant , the last time the light came on was 6 mo. ago . same codes . the light was on so i cleared the codes and test drove it several times under varying conditions and it runs great . never missfired or hesitated. tried cold and hot ....
November 28, 2005
2002 Chevrolet Express 1500 5.7L Misfire, MIL Lamp on VIN: 1GBFG15R72
P0300: Multiple Cylinder Misfire Detected. van is in with miss cylinders #6,5,7 checked fuel presure ok koeo62 koer 55. We took compression test ok 150 psi. replaced all 8 injectors and same problem. new fuel filter. when engine is running there is no ticking noise or any noise in engine. just miss. ca...
November 29, 2005
2002 Chevrolet Express 3500 LS 5.7L Misfire, MIL Lamp on VIN: 1GAHG39R82
P0300: Multiple Cylinder Misfire Detected. ... send a request, but when the chips are down you've got to call in for the big guns. The problem that I've been fighting has apparently been going on for about 6 months the cutomer just doesn't bring it back right away. Thje vehicle sets the ses light and...
November 30, 2005