Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
was everything done to correct this issue ?
NO vacuum leaks at all ?
when its skipping at idle if you remove one plug wire at a time off the cap do any you unplug make NO difference in the idle ?
ok but at idle will any wires you unplug off the cap NOT make a difference in the idle ?
just be sure there are NO vacuum leaks
with it setting a 300 code the crank sensor is reading a misfire
usually when all the cylinders will make a difference in the idle when removing spark plug wire and a brand new injection set up these issues come down to a bad crank sensor or the bottom distributor gear worn down enough to change the timing
pull out the distributor and be sure the bottom gear is not worn down at all
any signs of that change the gear or the distributor
if its not worn or was worn and you fixed that and it still does this i would try a new GM crank sensor
not really due to the signal is puts out to the computer
the power and ground should be good to it since the engine will run but its acting like the timing is off and when that happens its the distributor gear or the crank sensor
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I have read the back and forth. I think Gary was on the right direction. Have you pulled the distributor and inspected or replaced the drive gear?
It didnt have a sharp edge? Sometimes the wear is not obvious. It can look OK and be worn.
The scan tool should have had a CMP offset reading. Do you know what that value was?
Have you cleaned the mass air flow sensor?
Do you have a vacuum gauge?
The gauge is the only way to test vacuum. I would clean the mass air flow sensor with brake clean. A piece of fuzz will make it run funny.
No usually the crank sensor will prevent starting
It is only computer controlled from where you set it. That is why I asked about CMP Offset
Pulsating is an indication of a broken valve spring or burned valve. Not a good sign.