misfire codes after coil swap

O_Dogg · **Posted:** Thu Mar 29, 2007 2:06 pm

you may remember i was having a cyl 6 misfire. well i swapped the #6 coil and #2 coils and i still have a cyl #6 misfire code after i reset the 'puter. any ideas as to what it may be now???

O_Dogg · **Posted:** Fri Mar 30, 2007 1:48 pm

myjeepwalks · **Posted:** Fri Mar 30, 2007 9:52 pm

Did you try swapping the spark plugs in both of those cylinders also? Could even be a bad injector, put a screw driver up against the injector and put your ear up against the handle of the screw driver it should be ticking with the vehilce running. If not you have a bad injector or wiring. Check the wiring going to the coil, make sure that it is firing also. If all that checks out good do a compression test.

Is it a dead miss, random, only at idle, or under load/accel?

Jeepjeepster · **Posted:** Fri Mar 30, 2007 10:05 pm

How many miles?

If you cannot figure it out after checking the obvious, check the compression on that cylinder. Ive been reading about valve springs breaking and causing a misfire. Get it checked out before something worse happens.

O_Dogg · **Posted:** Fri Mar 30, 2007 10:54 pm

just over 36,000 plugs changed 2,000 ago or so. i know it isnt the coilpack now so ill have to see if i can get ahold of my friends comp guage

Jeepjeepster · **Posted:** Fri Mar 30, 2007 11:08 pm

O_Dogg wrote:

just over 36,000 plugs changed 2,000 ago or so. i know it isnt the coilpack now so ill have to see if i can get ahold of my friends comp guage

I wouldnt be to worried about the valve spring then. I was thinking more around 100k+..

Youve got plenty of Power train warranty left anyway.

O_Dogg · **Posted:** Fri Mar 30, 2007 11:20 pm

yeah i got the five star pre-owned so i got till 2011 or 80,000 miles just dont have the spare $100 for the deductable yet

LiLredLibby · **Posted:** Sat Mar 31, 2007 10:59 am

O_Dogg wrote:

just over 36,000 plugs changed 2,000 ago or so. i know it isnt the coilpack now so ill have to see if i can get ahold of my friends comp guage

I think what you need to do ,is buy a spark tester to plug into #6 wire while engine is running to verify a no spark condition.If all wiring and connectors are good to coil,and the tester does'nt show spark,you could be looking at a driver problem in the ECM.As you probably already know,don't remove this plug from engine while testing,you can get a spark tester for just a few dollars,and will use it alot in the future.

Ron

O_Dogg · **Posted:** Sat Mar 31, 2007 1:39 pm

ill have to look into one of those and keep it in the '79 ford after i figure the problem on the lib. cause i know the ford has some spark issues.

thanks

misfire codes after coil swap

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