Question about Pontiac Grand Prix
Any fault code there? I know you stated the Check Engine Light is not on, but have you checked it for stored fault codes anyway? Many fault codes are type B and type C fault codes, which means they can set and not turn the light on. If you do have any, please let me know.
The reason i ask, is that its very common for the Crank Position sensor to fail in the 3.8L engines, especially of that year range. Sometimes, they will set a P0336 fault code, which usually isolates the Crank Sensor, however the lack of that code does not give the crank sensor a clean bill of health. I would still suspect it.
Usually, the best way to spot one, is to watch engine RPM while cranking. Sometimes that works for the Tachometer but some cars, the gauges don't work while cranking, so you may need to watch Engine RPM on the scantool while cranking. If it says 0 (or a number less than 20; sometimes the scanner will show like 4RPM without the car running). So basically no change in RPM from Key-On to cranking leads to a bad crank sensor.
Also, about your low RPM's, its possible that you have any problem with the Torque Converter, first, check level fluids and fine wokr of solenoids.
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Posted on Jul 08, 2010
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Posted on Jan 02, 2017
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