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Re: 96 z24 cavalier idle problem 2.4
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Originally Posted by msca
but found out the car idles good when i disconnect the vacum line that goes from the throttle body threw the fire wall to the heater controls that blows my air threw my vents.
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That shouldn't be... There's nothing in the vacuum portion of the HVAC system that would affect how the engine runs. Check the vacuum hose that goes to the MAP sensor. They deteriorate for some reason and will leak. The only thing I can think of is that the MAP hose is leaking and the sensor is reading less vacuum than there is, and disconnecting the HVAC vacuum drops the vacuum just enough. Did you check for codes and check the spark plugs?
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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