Posted by jimg.allentown on June 05, 2016 at 19:30:31 from (108.2.196.109):
In Reply to: Any GM Mechanics? posted by Steve@Advance on June 04, 2016 at 12:07:12:
MAP sensor is a mixture control device. It "measures" the amount of air going into the engine based on the vacuum reading. Sensitive, but less accurate than a MAF sensor. MAF sensor measures the rate of air entering the engine based on the current it takes to keep the "hot wire" up to a specific temperature. Much m0ore accurate, and replaces the MAP sensor. You may still have a BARO sensor.
Your symptom seems to point more to a TP sensor or a gas pedal sensor. A scanner may give you some indication of a problem, but more likely you are getting a "dirty" signal. That is, the signal from the sensor is not a good clean DC voltage signal. The only way to verify that would be with a scope. Also, since you have a "fly by wire" throttle control, you have a sensor in the gas pedal as well as one on the throttle body.
Also, keep in mind that a Mass Air Flow sensor will NOT set a code unless it is a major failure of that sensor. It can go "out of calibration" and cause the mixture to get too rich or too lean.
Timing is another potential problem. Timing is continually varied by the PCM, and a CKP or CMP giving a "dirty" signal can also be a source of trouble. Maybe check that the connectors are clean and tight on them.
As a BTW, by law, emission control systems are covered by a 5 year/50,000 mile warranty. The entire engine control system from the PCM to the lowliest sensor are part of that emission system. A trip to the dealer with your complaint may be in order. They have diagnostic equipment that dwarfs anything that either a mechanic or a third party shop may have.
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