Originally Posted by
sone
I seen many and done many with the same problem. I don't think spark or spark timing cause it run fine after warm up. If it is spark or timing it would run bad all the time.
Usually thats right. However in this case it seems like its going to be a ground or a sensor or the ecu.
Last time I had the issue i had a plug in one of the plug wires and grounded to the manifold. When I was able to start it by giving it alot of gas and hold it at 2000 rpm you could see that the spark was yellow and weak and very erratic......then the motor smoothed out (as good as it could for three cylinders) the spark went to bright blue and in perfect time. I Put that plug wire back on and confirmed the motor was running fantastic. So I have seen visual evidence of what I suspected. Spark being weak and out of time.
So my guess is still some sensor, ecu or ground
I appreciate all the input. Ill get it eventually...I still have a list of things to check. I just wanted to run all this by you guys. Typically the users know the high fail items.
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