So with all of your help I got my timing belt lined up and the engine ran.


I let it go for a day or two and came back and it ran but this was the first time I ran it for a longer period and it didn't seem to idle well then after 3-6 minutes of idling it would stall out.

I ran it like that for 5-6 times to confirm my AMM was getting learned by the ECU.

I've just put this engine in recently so I have a clean throttle body, new plugs, new RPM sensor, clean flame trap, and associated plastic box under flame trap, injectors are all clicking and fuel pumps are working.

After checking the compression I noticed all 5 new spark plugs I had installed were now blackened with a dry black soot.

I assume this is from running rich - is that a good assumption?

I've already swapped in an AMM I had that was marked "known good" and disconnected battery so computer would relearn it.

Still no change

I know some things I need to check but what order should I check the following items in:

ECT sensor
ECU
FPR
Fuel pressure (I need to figure out what adapters I need to attach the tester)
TPS

So far no CEL unless I unplug the AMM

Any other things I should check?
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2 1990 Volvo 240s - 1 is my son's sedan the other my 245 in restoration, 1 1999 S70 is my current daily driver until I can get back into the 245!