Join Now
International Automotive Technicians Network

P0304 Diagnostic Trouble Code Discussion for December 2005

Cylinder 4 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 P0304
Help Request Posted
2001 Ford Windstar SE Sport 3.8L Misfire VIN: 2FMZA57451
P0304: Misfire. Check engine light on - when starts missing will have hissing almost like vacuum leak around rear of engine - have run injector balance test - have installed smoke tester for vacuum leaks - inspect ignition components - when straightens up will stop hissing
December 02, 2005
1996 Ford Taurus SHO 3.4L Stall, Misfire, MIL Lamp on VIN: 1FALP54N3T
P0304: misfire 4. car was towed in put on computor and codes were misfire all the cly that are mising are on one bank.the one next to fire wall. the car will start but is hard to keep runing. has anyone seen this before.have not run any test yet.those back cly hard top get to.w...
December 05, 2005
1999 Volkswagen Jetta GLS 2.0L Hesitation, Cuts out, MIL Lamp on, LOW POWER VIN: 3VWSC29M5X
P0304: cylinder 4 mis fire. heres what we have, this thing will idle good, and will drive okay once speed is obtained. on acceleration this thing will bog almost to a stop, rpm will not go over 1500 rpm. in nuetral it will rev on light acceleration but during wot it will bog, backfire th...
December 05, 2005
1995 Dodge Neon 2.0L Misfire, MIL Lamp on VIN: 1P3ES47C4S
P0304: 4 misfire. This neon has a cyl going dead randomly. It only happens to cyl. 1 & 4. Not at the same time. It seems to happen on throttle tip in and sometimes at idle. Car will work fine under heavy acceleration. Have read old archives about problems with the wiring ha...
December 06, 2005
2001 Ford Windstar SE Sport 3.8L Misfire VIN: 2FMZA57451
P0304: Misfire. Check engine light on - when starts missing will have hissing almost like vacuum leak around rear of engine - have run injector balance test - have installed smoke tester for vacuum leaks - inspect ignition components - when straightens up will stop hissing
December 07, 2005
1999 Volkswagen Jetta GLS 2.0L Hesitation, Cuts out, MIL Lamp on, LOW POWER VIN: 3VWSC29M5X
P0304: cylinder 4 mis fire. heres what we have, this thing will idle good, and will drive okay once speed is obtained. on acceleration this thing will bog almost to a stop, rpm will not go over 1500 rpm. in nuetral it will rev on light acceleration but during wot it will bog, backfire th...
December 08, 2005
2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNCS18W6Y
P0304: Cylinder misfire 4. Vehicle was brought in for running rough and failed emissions. Upon looking at the vehicle I found that it still had all the original tune-up parts so they all got replaced ie... Plugs, wires, cap and rotor. After futher testing I also found that the Spider In...
December 12, 2005
2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNCS18W6Y
P0304: Cylinder misfire 4. Vehicle was brought in for running rough and failed emissions. Upon looking at the vehicle I found that it still had all the original tune-up parts so they all got replaced ie... Plugs, wires, cap and rotor. After futher testing I also found that the Spider In...
December 13, 2005
1999 Subaru Forester L 2.5L Misfire, MIL Lamp on VIN: JF1SF6352X
P0304: Cylinder 4 Misfire Detected. ... running/MIL light on complaint. It was not symptomatic at the time, the above codes were stored (P0303, P0304). Freeze data showed a warm engine, ~1200 rpm, STFT 6%, LTFT 11%, closed loop, TPS 22%. We found original spark plugs and wires, and replaced them...
December 14, 2005
1999 Subaru Forester L 2.5L Misfire, MIL Lamp on VIN: JF1SF6352X
P0304: Cylinder 4 Misfire Detected. ... running/MIL light on complaint. It was not symptomatic at the time, the above codes were stored (P0303, P0304). Freeze data showed a warm engine, ~1200 rpm, STFT 6%, LTFT 11%, closed loop, TPS 22%. We found original spark plugs and wires, and replaced them...
December 15, 2005
2001 Lincoln LS 3.9L Misfire, MIL Lamp on VIN: 1LNHM87A61
P0304: Cyl. 4 misfire detected. Customer complaint was "low speed miss". Took for test drive and found a shake at idle and seemed down on power at wot. Scanned and found fuel trims whacked out and P304 stored. Checked mode $06 data and cyls. 1,2 with slight misfires, #4 was maxed out...
December 23, 2005
2001 Lincoln LS 3.9L Misfire, MIL Lamp on VIN: 1LNHM87A61
P0304: Cyl. 4 misfire detected. Customer complaint was "low speed miss". Took for test drive and found a shake at idle and seemed down on power at wot. Scanned and found fuel trims whacked out and P304 stored. Checked mode $06 data and cyls. 1,2 with slight misfires, #4 was maxed out...
December 26, 2005
1998 Chevrolet S10 LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCDT19X5W
P0304: Cylinder 4 Misfire Detected. thank you in advance. vehicle came to us with a miss at idle on #4 cylinder occasionally on #6. off idle the miss goes away. short term fuel trim seems to be taking away fuel neg 9 to neg 21. that threw out theory for vacuum leak but still tested for vac leak ...
December 28, 2005
1996 Ford Windstar GL 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2FMDA5145T
P0304: Misfire 4. I need some thoughts on this. If this van is allowed to sit in the shop running until the fan cycles at least twice, then shut off and allowed to heat soak over 10 minutes it will run poorly with multiple cylinder misfires. The fuel trims will increase to 25% ...
December 28, 2005
2001 Honda CR-V EX 2.0L MIL Lamp on VIN: JHLRD18641
P0304: Cylinder 4 Misfire Detected. ... came in with a P0505 idle system malfunction. This was pretty straight foward. I removed the idle motor and found the screen completely plugged. I cleaned the screen cleared the code and that's when it got weird. After the code was cleared it idled for a c...
December 31, 2005
2001 Ford Windstar SE Sport 3.8L Misfire VIN: 2FMZA57451
P0304: Misfire. Check engine light on - when starts missing will have hissing almost like vacuum leak around rear of engine - have run injector balance test - have installed smoke tester for vacuum leaks - inspect ignition components - when straightens up will stop hissing
December 02, 2005
1996 Ford Taurus SHO 3.4L Stall, Misfire, MIL Lamp on VIN: 1FALP54N3T
P0304: misfire 4. car was towed in put on computor and codes were misfire all the cly that are mising are on one bank.the one next to fire wall. the car will start but is hard to keep runing. has anyone seen this before.have not run any test yet.those back cly hard top get to.w...
December 05, 2005
1999 Volkswagen Jetta GLS 2.0L Hesitation, Cuts out, MIL Lamp on, LOW POWER VIN: 3VWSC29M5X
P0304: cylinder 4 mis fire. heres what we have, this thing will idle good, and will drive okay once speed is obtained. on acceleration this thing will bog almost to a stop, rpm will not go over 1500 rpm. in nuetral it will rev on light acceleration but during wot it will bog, backfire th...
December 05, 2005
1995 Dodge Neon 2.0L Misfire, MIL Lamp on VIN: 1P3ES47C4S
P0304: 4 misfire. This neon has a cyl going dead randomly. It only happens to cyl. 1 & 4. Not at the same time. It seems to happen on throttle tip in and sometimes at idle. Car will work fine under heavy acceleration. Have read old archives about problems with the wiring ha...
December 06, 2005
2001 Ford Windstar SE Sport 3.8L Misfire VIN: 2FMZA57451
P0304: Misfire. Check engine light on - when starts missing will have hissing almost like vacuum leak around rear of engine - have run injector balance test - have installed smoke tester for vacuum leaks - inspect ignition components - when straightens up will stop hissing
December 07, 2005
1999 Volkswagen Jetta GLS 2.0L Hesitation, Cuts out, MIL Lamp on, LOW POWER VIN: 3VWSC29M5X
P0304: cylinder 4 mis fire. heres what we have, this thing will idle good, and will drive okay once speed is obtained. on acceleration this thing will bog almost to a stop, rpm will not go over 1500 rpm. in nuetral it will rev on light acceleration but during wot it will bog, backfire th...
December 08, 2005
2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNCS18W6Y
P0304: Cylinder misfire 4. Vehicle was brought in for running rough and failed emissions. Upon looking at the vehicle I found that it still had all the original tune-up parts so they all got replaced ie... Plugs, wires, cap and rotor. After futher testing I also found that the Spider In...
December 12, 2005
2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNCS18W6Y
P0304: Cylinder misfire 4. Vehicle was brought in for running rough and failed emissions. Upon looking at the vehicle I found that it still had all the original tune-up parts so they all got replaced ie... Plugs, wires, cap and rotor. After futher testing I also found that the Spider In...
December 13, 2005
1999 Subaru Forester L 2.5L Misfire, MIL Lamp on VIN: JF1SF6352X
P0304: Cylinder 4 Misfire Detected. ... running/MIL light on complaint. It was not symptomatic at the time, the above codes were stored (P0303, P0304). Freeze data showed a warm engine, ~1200 rpm, STFT 6%, LTFT 11%, closed loop, TPS 22%. We found original spark plugs and wires, and replaced them...
December 14, 2005
1999 Subaru Forester L 2.5L Misfire, MIL Lamp on VIN: JF1SF6352X
P0304: Cylinder 4 Misfire Detected. ... running/MIL light on complaint. It was not symptomatic at the time, the above codes were stored (P0303, P0304). Freeze data showed a warm engine, ~1200 rpm, STFT 6%, LTFT 11%, closed loop, TPS 22%. We found original spark plugs and wires, and replaced them...
December 15, 2005
2001 Lincoln LS 3.9L Misfire, MIL Lamp on VIN: 1LNHM87A61
P0304: Cyl. 4 misfire detected. Customer complaint was "low speed miss". Took for test drive and found a shake at idle and seemed down on power at wot. Scanned and found fuel trims whacked out and P304 stored. Checked mode $06 data and cyls. 1,2 with slight misfires, #4 was maxed out...
December 23, 2005
2001 Lincoln LS 3.9L Misfire, MIL Lamp on VIN: 1LNHM87A61
P0304: Cyl. 4 misfire detected. Customer complaint was "low speed miss". Took for test drive and found a shake at idle and seemed down on power at wot. Scanned and found fuel trims whacked out and P304 stored. Checked mode $06 data and cyls. 1,2 with slight misfires, #4 was maxed out...
December 26, 2005
1998 Chevrolet S10 LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCDT19X5W
P0304: Cylinder 4 Misfire Detected. thank you in advance. vehicle came to us with a miss at idle on #4 cylinder occasionally on #6. off idle the miss goes away. short term fuel trim seems to be taking away fuel neg 9 to neg 21. that threw out theory for vacuum leak but still tested for vac leak ...
December 28, 2005
1996 Ford Windstar GL 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2FMDA5145T
P0304: Misfire 4. I need some thoughts on this. If this van is allowed to sit in the shop running until the fan cycles at least twice, then shut off and allowed to heat soak over 10 minutes it will run poorly with multiple cylinder misfires. The fuel trims will increase to 25% ...
December 28, 2005
2001 Honda CR-V EX 2.0L MIL Lamp on VIN: JHLRD18641
P0304: Cylinder 4 Misfire Detected. ... came in with a P0505 idle system malfunction. This was pretty straight foward. I removed the idle motor and found the screen completely plugged. I cleaned the screen cleared the code and that's when it got weird. After the code was cleared it idled for a c...
December 31, 2005