Question about 1990 Pontiac Grand Prix
It could be either a clogged catalytic converter, or a mass air flow sensor. One way to check the cat is to let the car run for about 10 minutes and look at the underside of the car to see if anything is glowing, or check it after a very short drive. To check the Mass airflow sensor locate it and unplug it while the car is running and see if it clears up.
Posted on Feb 05, 2010
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Posted on Jan 02, 2017
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First off, is a check engine lite on,if so do you know the codes?It does have a cam sensor,the cam sensor malfunction gives a code reading,in general fuel probs do not give a code this is done bymanually checking fuel press ect....the module does give specific codes as well...I have seen a cam sensor give the prob. you list, BUT TEST BEFORE YOU BUY,you can get your own codes from the a.l.d.l connector,under dash...take a coated jumper wire and push one end into the g .circuit ,the other into the b terminal and watch the lite flashig in the dash,,ie, 2 flashes...pause then 4 flashes is an example....wilf
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