Start the car idles fine for about 30 seconds then starts to sputter and has a bad odor coming out of the tail pipe. Ran a computer check and it said it was the MAP sensor. Replaced the MAP sensor but still does the same thing. If the MAP sensor is unplugged the car will idle fine, but of course it doesn't run well down the road that way.
I usually want to check sensor wiring circuits before replacing anything. As you can see, the map sensor shares ref voltage and ground with others. Orange wire with black tracer is signal return. The gray wire should be ref voltage 5 volts. The signal wire should be lite green. Vacuum for the map sensor is also important. What was actual trouble code was it two digit code or five?
SOURCE: what is going on idle fine an then
Bad distributor and/OR coil, I can guess, or the computer.
SOURCE: I have a 96 cavalier z24. when I start it up the
See if there is a code in the computer and work from there. Find someone with an OBD2 code reader. If I'm not mistaken an OBD2 code reader works on 1996 and newer models. Could be a bad coil and you don't notice it when you first start it until it idles down, to check for that, while the engine is running, pull each wire off the spark plug, Each time you do that you should hear the engine struggle. Then pick back up once you plug it back to the spark plug. If you pull one and nothing happens to the engine, that could be all or part of the problem. Hope this helps.
SOURCE: when i plug in maf sensor camaro idles from 500 to
Check all the vacuum lines for leaks, and also the timing, make sure its right.
SOURCE: 1994 chevy with 5.7 L
Sounds like you have a vacuum leak. When the engine is cold the leak is there but as the engine warms up the parts start to expand thus closing the gaps and sealing the leak. I had this problem on my personal vehicle and it turned out to be lower intake gaskets.
SOURCE: 2002 impala 3.8L 180,000kms. Having
it is possibly the throttle position sensor(tps) malfunctioning. basically the computer or "brain" of the car thinks the throttle is in a different position than it really is and automatically makes adjustments to fuel, air ect.... based on these false readings from the sensor thus causing the engine to react a little different when you expect to have power.
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