1989 pontiac bonneville le 3800 MAP sensor location and pcv valve - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat


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Old 07-08-2018, 04:24 AM   #1  
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Default 1989 pontiac bonneville le 3800 MAP sensor location and pcv valve

I am having issues locating my MAP sensor and pcv valve. I have replaced the crankshaft sensor, camshaft sensor, EGR valve, harmonic balancer, MAF sensor, downstream o2 sensor, but the car idles roughly still and is throwing a code 41 still. so moving on to the pcv valve and MAP sensor. the car stalls when I put any type of load on it for example if I have the a/c running and take it out of park and put it in reverse it dies or if I have to make a hard stop it stalls out. acceleration is also quite poor. and it stutters when the vehicle shifts but if I give it gas or let of the gas it corrects its self.
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Old 07-08-2018, 08:22 AM   #2  
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I don't believe the car has a map sensor, but code 41 alone can cause the issues you are describing.

Code 41 sets when the ecm isn't receiving the cam signal. It uses this to set sequential fuel injection timing. Otherwise, the computer guesses, assumes cylinder 1 is firing, and start the sequential fueling based on no real reference point, leaving it with a 1 in 6 chance of getting it right.

The most common cause is a failed interrupter magnet. You can check this by removing the cam sensor, and look in the hole for the magnet on the cam shaft. You may have to rotate the engine until you see it using an inspection mirror. If it'* intact, it will look like a little top hat. If it'* broken out, you will see pieces of what remains.
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