Question about 2002 Pontiac Grand Prix
I had a mechanic take a look and he said it was the PCM so we got it replaced. Still have the same problem so we unhooked the Mass Airflow Sensor and it runs fine.
It sounds like the crankshaft position sensor has gone bad or either the wires to it.The sensor is located to the side of the harmonic balancer. I would suggest that you would take to an experienced mechanic to replace as the sensor has to be indexed to the balancer(set in a certain place).
Posted on Jul 02, 2009
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Posted on Jan 02, 2017
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Oct 07, 2016 | 2001 Pontiac Grand Prix
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.
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