Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi there, I am Cam, Can I get your first name? Also can you tell me if the check engine light is on? The crank relearn is only initiated with a scanner. It then asks the driver to rev the engine quickly to a preset value, usually around 4000 rpm. It would set a code suggesting that the relearn needs to be done.
Attached is the document outlining that.
Is it always at higher RPM or does it do this only if you rev it higher faster? How does it drive? Also does it do this if you unplug the EGR? Mass Air Flow sensor (MAF)? Map sensor? Without codes it does make this a bit more difficult to find.
Also prior to the replacement of the parts you listed, is this the same reaction it had/
OK, so in park I am not as concerned but does it drive then now Scott? And if not then lets look at the position of the crank sensor. Is there a chance the balancer is hitting it? Wires chaffed? If no then it may simple be that the new sensor is not good. It happens.
Ok so then it did not do this before the belt/balancer/sensor replacement so it stands to reason that one of those is bad. Belt I doubt, sensor possible but if the balancer is out or the reluctor is not aligned properly it would cause this. Myself I would take the sensor and put the original back in and try that. IF it does not change then I would consider calling the balancer you got bad.
Ok so then we need to see what the fuel pressure is doing, I am surprised there is no check engine light. Can you see when the last fuel filter was replaced, consider taking it off and checking it and even replacing it? Also unplug the map, Mass Air Flow sensor (MAF) in turn and see what that does.
Scott, I am stepping away from my computer for a bit, I will check in with you in an hour or sooner.