4th cylinder misfire code Help needed - 2003-04 Mach 1 Registry Owners Club

03INCT · 04-19-2014, 05:52 PM

Took car out of storage last week. Cleaned engine with s100.
Must have got too much water on it (stupid)

Car was running rough on the load. Friend had a meeter and said I had a mis fire on the 4th cylinder.

Took off coil covers and there was water.

Blew it out but it coded again.

Took out all eight coil tubes and reset the code by disconecting battery.

Car runs 100 x better but still "dogs" when I try to bang of 2nd.

Any suggestions???

BTW 28k mileage

4a7191a · 05-09-2014, 01:26 AM

Could be a bad coil , I've had several go out over the ten years dealing with these cars.

SGT GIPP · 05-09-2014, 03:28 AM

The coils and/or plugs could still have moisture on them. You would be amazed by how much water a coil pack can hold. If that doesn't work, troubleshoot by changing the plugs and purchasing one or more coils, until the misfire under acceleration stops. It happened to me a few times, as a result of cleaning my engine. It would clear up after a few days. Last month, the problem persisted, so I swapped coils with a fellow Mach owner, and the car ran like new. So I replaced them all..Gas mileage increased also.

4a7191a · 05-09-2014, 04:03 AM

If you have to replace them all, go stock most would say. I gave the msd coils a shot and have no complaints. Seemed to idle better when I installed them at the time.

Mach828 · 05-09-2014, 09:05 AM

I'd just pull the coils out and let things dry out for a few days first

04-19-2014, 05:52 PM	#1
03INCT Registered User Join Date: Mar 2009 Location: Brookfield, CT Posts: 145	4th cylinder misfire code Help needed Took car out of storage last week. Cleaned engine with s100. Must have got too much water on it (stupid) Car was running rough on the load. Friend had a meeter and said I had a mis fire on the 4th cylinder. Took off coil covers and there was water. Blew it out but it coded again. Took out all eight coil tubes and reset the code by disconecting battery. Car runs 100 x better but still "dogs" when I try to bang of 2nd. Any suggestions??? BTW 28k mileage

05-09-2014, 01:26 AM	#2
4a7191a Registered User Join Date: Jun 2004 Location: beaumont texas Posts: 1,344	Re: 4th cylinder misfire code Help needed Could be a bad coil , I've had several go out over the ten years dealing with these cars. __________________ 2004white mach1 2001 svt lightning 2011 Mitsubishi Evo X 1999 F250 7.3L

05-09-2014, 03:28 AM	#3
SGT GIPP Registered User Join Date: Mar 2010 Location: Macon,Ga Posts: 220	Re: 4th cylinder misfire code Help needed The coils and/or plugs could still have moisture on them. You would be amazed by how much water a coil pack can hold. If that doesn't work, troubleshoot by changing the plugs and purchasing one or more coils, until the misfire under acceleration stops. It happened to me a few times, as a result of cleaning my engine. It would clear up after a few days. Last month, the problem persisted, so I swapped coils with a fellow Mach owner, and the car ran like new. So I replaced them all..Gas mileage increased also.

05-09-2014, 04:03 AM	#4
4a7191a Registered User Join Date: Jun 2004 Location: beaumont texas Posts: 1,344	Re: 4th cylinder misfire code Help needed If you have to replace them all, go stock most would say. I gave the msd coils a shot and have no complaints. Seemed to idle better when I installed them at the time. __________________ 2004white mach1 2001 svt lightning 2011 Mitsubishi Evo X 1999 F250 7.3L

05-09-2014, 09:05 AM	#5
Mach828 Dark Knight Join Date: Nov 2009 Location: Albuquerque, NM Posts: 5,759	Re: 4th cylinder misfire code Help needed I'd just pull the coils out and let things dry out for a few days first __________________ Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage

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