Question about 1999 Chevrolet Tahoe

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Mass air flow and cam position sensor?

I replaced both of them and the car still has a light on.ran good for about 20 mins and then the light came back on with the same codes.replaced the cap and rotor oil in the anti freeze or vice versa.i sprayed all around the intake no smoothing out.what the heck next????

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What codes are you getting? If you post them here I can try to help you narrow down the problem. What symptoms are you seeing in the car's operation?

Posted on Oct 23, 2008


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I would check for vacuum leaks. And clean the mass air flow sensor and the throttle body. (use break clean) spray the sensor and use a toothbrush on the throttle plate and as far as you can reach in it. I would also replace the air and fuel filters if you haven't done this with in a year.

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Your problem was (most likely) the mass air-flow sensor. Try disconnecting the sensor, the car should run at default values. This will turn on your check engine light on again but it will indicate that the sensor should be replaced. You can clear the light with a scanner or disconnect the battery again.

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Bucking engine

Check the fuel pressure,also change the fuel filter.check the crankshaft sensor,or replace.It sounds more like the tps sensor(throttle position sensor).It is mounted in line with the throttle axle,on the throttle horn.Of course .with out being there and checking I am just guessing.But map sensor or mass air flow sensor could also cause this.Have you checked the air filter?This will cause the problem,if it is stopped up restricting air flow to engine and mass air flow.,map sensor,and vacuums needed to run the car.If I can help,let me know.

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