Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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as far as the timing, when you re connect the timing wire with engine running, the timing does not change until you turn it off and re start. then the timing should go back to the control of the ignition module.
have you had the timing chain checked for slack??? this will cause your hesitation
ok, good information thanks
as far as the cold running, that is controlled by the ect. that is a temp sensor that sends the temp to the ecm which adjusts fuel mixture. that in itself could be a problem as they were common failures along with the connector in the past.
did you ever check the actual fuel pressure??
no, O2 sensor will not do it. it would code if there was an issue
same with tps. it sounds like you have a basic engine issue at this point.
no, it should retain some pressure for the next start up.
what was the actual pressure??
12 lbs is good. with key off, it should be around 4-5 lbs.
how high does the temp go when hot???
the hooter the temp shows, the leaner the ecm will make the engine run
yes, check the temp when the motor is hot.
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all those readings look good. it looks like it could be a mechanical problem, not a control problem.
I would start by removing the valve covers and watching the rocker arm movement while running to see if one may not be moving the same as the others
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ok, let me know
you can even back off the valves to 0 plus 1/2 turn. it will give you better low end performance.
all valves should have good oil pressure through the push rods. how many miles on this motor???
have you ever done a compression test???
back to your original question, does the timing advance with the connector attached??
yes, that is normal. but the dropping to 0 concerns me. I suspect the ignition module not working correctly.
yes, I think thats a good idea. that is what controls the timing.
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I have attached a picture of a knock module, I just need to know if your vehicle has this module. It is next to the throttle body on a bracket.