I have a 2001 GMC Jimmy 4x4 (T15) with a 4.3L v6 auto 149,000 miles. Just replaced the lower intake manifold gasket the other week, so had to remove the distributor (relocated by scratch marks in same location it was). When the throttle is goosed it pops like the timing is off, but if I advance timing by the distributor 1 gear, it wont run and the other way, it wont even idle. The truck is throwing P0336 code referring to CKP sensor 'A' circuit problem but it only throws the code if the engine reaches above 2000 RPMs for three ignition cycles in a row. It also begins running rough and the tach jumps up and down above 2000 RPMs. I backprobed the CKP and CMP sensors, replaced the CKP and distributor (CMP built in, but did dist because the shaft was a little worn) and it made no difference. Found no problems in the wiring. When I run the computer on it, the ECM is picking up up to 12,000 RPM spikes, but it has no problems as long as it stays below 1900RPMs.
have the same problem?
Friday, November 16th, 2007 AT 6:43 PM