• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Weird Issue



I just noticed that the vacuum line to the evap canister is missing that couldn't cause a misfire could it? And where the heck is the evap canister at anyway, I couldn't find it.
 
evap canister sits behind the blower.. its pointless bull****... but id fix teh vac leak.. doubt its the misfire cause but i could be wrong.
 
Something real similar to this happened to my friend just recently, he had a miss on cyl #5 and replaced everything and couldn't figure it out for a long time. It turns out in the end that his fuel trims were bad. We then Put the stock PCM back in an it ran perfect.
 


So I drove the car halfway across the state for work, then scanned it when I got home, now its putting up the code P0300 random multiple cylinder missfire. So I am more convinced that it is indeed a bad ICM.
 
Well a little update on this here is a list of things I have replaced/removed trying to figure out wtf is going on.
  • Checked 800 times for vacuum leaks
  • New Autolite 104's gapped at .055
  • New Premium Wires
  • Swapped out all the coils twice
  • Swapped out the icm twice
  • Removed the cat
  • Removed Egr
  • Swapped injectors around
  • Replaced all the orings
  • Replaced new Powerbond SFI Harmonic Balancer
  • Replaced Crank Position sensor
Still have random multiple misfires.

This screen shot is from the car idling after a 15 min cruise down the highway. I tried to get a scan but when I opened the file it was blank :confused:
screenshotivf.jpg
 


Replaced Cam Position sensor today and still random multiple missfires........ that leaves only 2 more things that could be wrong the computer is bad or I have multiple chipped pistons.
 
Went for a cruise down the highway for about 15 min, and my Timing Advance is all over the place while cruising its anywhere from 0* to -29.5* LTFT1 was pretty constant at -8.53975% had a short blip for a few seconds to -7.8125%
 


Even with that thumbnail post I can still see the damage. So you just noticed this recently?
 
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