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1990 c1500

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by bwilkes, Feb 18, 2012.

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  1. bwilkes

    bwilkes New Member

    I keep getting a code 32, 33, 34 it runs good and as is warms up it runs worse andworse. I changed out the Map sensor, inspected all of the vacuum lines and wiring. It all looks ok to me.

    I am stuckand am not sure where to look next.

  2. chevynut1

    chevynut1 New Member

    This is what I found out. Hope it helps. 32= EGR solenoid-wiring,poor connection,EGR valve,ECM
    33= MAP sensor voltage high-wiring,hose blocked/leaking,map sensor,ECM
    34= MAP sensor voltage low-wiring open circuit/short circuit to ground,map sensor,ECM.
    again, hope this helps.


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