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Originally Posted by JustJeff
check timing,
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I think I forgot to address this, but...
Ignore the trailing mark for now.
I believe the trailing ignition timing is dependent on the boost sensor signal, so that's why it's not doing the proper 15-degree split.
As long as the leading is spot on...
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As a general overview, I think I have some fundamental wiring issues going on. My AEM gauge will spontaneously show way over boost/vac. The last time it did it 5psi boost was the reference point during it's shutdown procedure. On startup and shutdown it will generally go to it's baseline then either dropdown and start operating, or shutdown. I didn't look when I first started up the engine but saw it while driving. When I turned the engine off the closing ceremony had it reference to 5psi.
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This sounds like it's isolated to the aftermarket boost gauge itself?
If so, then it has nothing to do with your engine running problems...
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Also my aftermarket alarm was so out of sorts that I disconnected the alarm cpu entirely. I didn't have constant power going to it at all and when I started disconnected negative wiring at the battery my alarm siren starts going off very faintly. Very strange in that the alarm should not have been getting any juice at all. When I reconnected the ground wire for the siren (connected directly to the battery sidepost) my siren starts going off full blast...again without having constant power to the alarm cpu.
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This is a classic case of a ground loop circuit.
Like the above, this should not have anything to do with your engine running problems...
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My wideband should be here tomorrow. Hoping to have it up and running this weekend. Maybe afr will shed some light on whatever is going on?
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I doubt it.
I still have my money it's the TPS or related...
-Ted