[rocksarntpeople]

Title says it all...persistent misfire code on cylinder 5 and just trying to figure out why...below is the list of the things I have replaced in the order they were done and mileage...stock tune and car currently has 61,500 miles:

Plugs: OEM - 59500
Coils: OEM Eldor - 59500
Walnut Blasting: 59800
Replace all Oil Gaskets (oil filter housing, valve cover, oil pan, front and rear main) Coolant, Oil and Filter: 60000
Full OEM Turbo Replacement all lines, etc: 60500
PCV and Catch Can: 60500
VRSF Charge Pipe and Tial BOV: 60500
6 OEM Index 12 Injectors/Decouplers: 61000
Both Precat O2 sensors: 61500

[NoQuarter]

I put in a brand new coil, still got a misfire.

Replaced the new coil with another new coil - misfire gone.

[rocksarntpeople]

Originally Posted by NoQuarter

I put in a brand new coil, still got a misfire.

Replaced the new coil with another new coil - misfire gone.

Good to know...gonna try and move the plug and coil from cylinder 5 around and see if it follows.

[mxchris727]

If the misfire remains, than you might have a bad MOSFET in the DME for that one cylinder. Other than that, it would have to be mechanical.

[homemade_f81]

What is the exact code that you're getting?

[rocksarntpeople]

So an update....I moved the plug from cylinder 5 to cylinder 1 and the coil from cylinder 5 to cylinder 2...cleared the misfire code and everything seems ok minus a bit of stumbling at idle but no codes even under WOT...when I floor it in lower gears there is a slight hesitation so I filled up with 93 Sunoco and ran some Techron through it to see if it clears up...next step might be clean both MAP and TMAP sensors??


***Both Plugs and Coils looked normal...slight gas smell, but nothing out of the ordinary...not wet or black***

[rocksarntpeople]

Another thought: What is the proper way to reset all the adaptations and learned values? INPA? ISTA? Flash a tune on it? Perhaps there are still some out of whack due to the various parts that were replaced?