Question about 2000 GMC New Sierra 1500

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Engine runs rough, while running if the MAP sensor

1991 GMC 1500; V-8: Engine runs rough, while running if the MAP sensor is disconnected the engin shuts off.

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Then map is working, have you tried tune up?

Posted on Jun 09, 2010

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Can a MAP sensor just be faulty?


try this, disconnect map sensor while running. if it runs a lot worse or rough. map is ok. but if it does not make a difference the way the engine runs it is bad. if disconnected the engine may shut off. this tells you the sensor is doing its job. yes they can go bad!

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Huh??? Why change the Knock Sensor? The Knock Sensor is not going to cause your engine to shut down. Sounds like a Cam Sensor or MAP Sensor problem to me. Is the computer setting any codes?

Sometimes you can diagnose a messed-up MAP sensor by unplugging it and starting the engine. If the MAP is causing your problem, it will start and run. (It won't run very good, but it should idle OK)

If you have a 4.3L engine, I have seen Cam Sensors cause a start and stall condition. (part of the distributor assembly)

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Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.

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