1997 markviii running really bad..

I assume you also replaced the boots?

Go to the auto box store and rent a noid light to try and track down your miss.
 
hey guys still havnt found the problem .the parts store would only take the cops back for a new set of accles so i put a new set in today still acting funny .well on a side note got my new GENISYS TOUCH yesterday so i hooked that up and seems like with this scan tool the o2 that was not showing any mv is showing 617mv just like the other side now funny huh . the new scan tool did show that the #2 cyl had 4,986 miss fires while all the others had none . anyone got anything .
 
87TTOPGT420 said:
ya look at cylinder number 2...spark fuel....compression test

try swapping coil and see if missfire follows coil location
Click to expand...

why cyl number 2 i dont understand.is there something that im missing.
i did put a coil that i had laying in the garage that i do kno is good drove the car for drive cycle and there was no missing or anythat the scanner picked up on.
 
87TTOPGT420 said:
you said cylinder 2 showed almost 5000 on misfire.....check that cylinder
Click to expand...

yea i seen that sorry i miss typed cyl #5 . sorry i was usein the GENISYS TOUCH to type all that.since my last post i took the coil off of cyl #5 and put one of my old ones that was still good on cyl #5 ,also i reset that kam and drove the car for 15-20 miles on the freeway ,then i drove the car for 10-15 miles in the city .checked the missfire count there were none . so as of now everything is acting as it should the motor also runs great so far.
 
Could have excessive carbon buildup on the valves of that cylinder or on the piston.
 
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