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1998 Grand Prix SE 3.1 Question. Idle problems

2 messages,  Last post on Oct 30, 2009 at 3:22 PM

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#1 of 2 1998 Grand Prix SE 3.1 Question. Idle problems by esone Oct 06, 2009 (10:48 pm)
Hello everyone. First off, thanks for taking the time to read my post.    I have recently bought a 1998 Pontiac Grand Prix SE 3.1 for $600. When I purchased it, it had the Low Coolant light on, and check engine light on. I knew right off the go what the coolant light was. Damage to the intake manifold gasket due to the DexCool that was in the cooling system. I had that replaced. The Low Coolant light is still blinking, I'm thinking it is a bad sensor because I had also just replaced the radiator cap and upper hose, no further leaks are found in a pressure test. Oil was changed when intake was replaced as to get out all the coolant/water from the engine oil. This is not my main problem.    The main problem is the car has a somewhat of a rough idle. More now than before.When you start the car (It starts fine by the way) the RPMs fluctuate from 500 RPM - 1000 RPM. It doesn't die out, but sounds sluggish. It is fine while moving, and when it slows back down to idle, it fluctuates only minorly. The Check Engine light I am getting is for a Camshaft Positioning Sensor. I know where it is, and how to change it. But, would this be the reason of why it is acting so strangely? Replies to this message: eefy (Oct 30, 2009 3:22 pm)
#2 of 2 Re: 1998 Grand Prix SE 3.1 Question. Idle problems [esone] by eefy Oct 30, 2009 (3:22 pm)
Replying to: esone (Oct 06, 2009 10:48 pm) Yes, a faulty camshaft position sensor will cause engine to run erratic, eventually it will cause the engine to not start. I am in the process of replacing the head gaskets on mine but dont know the head bolt torque settings, can you help?

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