Originally Posted by
Hellbilly
I cant figure out the ignition issue... when it first starts up the advance is normal. As it starts to warm up and lower RPM, it starts flashing back and forth between normal and over 23000 degrees advance. By the time it gets up to normal temp, it never shows a normal advance. I've tried replacing distributor with the one out of my old engine and also the original coil. I've reburned chips, even tried the original calibration with nothing changed except engine constants. I checked for spark at each cylinder, and put fresh plugs in. I'm running out of ideas. When it shows a normal advance value, it runs pretty decent, but once the advance goes haywire, it starts missing and backfiring if you try to give it throttle to fast or Rpm go above 3000. Both the old, Known good parts and the brand new parts act the exact same way. I do have a knock sensor fault but I think it might be the wrong one... if you look it up on Summit, it shows like 3 different ones and doesn't say what the difference is. I can swap that out with my old one but I don't see a knock sensor causing this problem. I can try another temp sensor, but temps seem to be working correctly. No other data is going haywire like advance is so I'm at a loss with what would cause this. The PCM shouldn't even be able to calculate that range, right?
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