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More EGR trouble

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Adub, Dec 27, 2002.

  1. Adub

    Adub 1/2 ton status

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    Old Problem: SES throws code 32 on highway
    Replaced EGR Valve, solenoid, and vacuum lines. Check EGR passages with valve off, passages are open.

    Truck runs great for 2 weeks, now running like crap again.
    Throws code 32 when driving around town, light stays on for 5 minutes or so, then goes off, truck still runs like crap. All lines are properly connected. I am clueless, could the valve have gone bad already?
    Thanks
    Aaron
     
  2. Adub

    Adub 1/2 ton status

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    ????
     
  3. YtseJam

    YtseJam 1/2 ton status

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    Check to make sure that the egr isn't actually hanging open. Make sure manifold vacuum is present at the inlet of the sol and not on the other side at idle. check to see if the egr is actually hanging open by working the plunger up and down, If that is ok I would take it off and inspect the mounting gasket and the egr passages.
     
  4. SickboySS

    SickboySS 1/2 ton status

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    mabey its the IAC valve
     
  5. 87sm465np208

    87sm465np208 1/2 ton status

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    yea id check the Idle Air Control too, at least take it out spray it down with C&C cleaner and put it back in, or if you wanna spend more money, go and get another IAC. /forums/images/graemlins/thumb.gif

    /forums/images/graemlins/usaflag.gif /forums/images/graemlins/truck.gif
     
  6. Adub

    Adub 1/2 ton status

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    If it was the IAC, why would it still throw code 32?
    Aaron
     
  7. Thunder

    Thunder 3/4 ton status

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    Ah the notorious code 32.
    If the EGR stuff is all new and the passages and vacune lines are ok then about the only thing I can think of is it is possible the MAP sensor is not working right.
    A code 32 is set by: EGR open command did not change MAP sensor signal. Normal EGR flow should cause slight decrease in manifold vacuum which would change MAP sensor signal.
    It could be the MAP sensor is just working enough not to set a code 33 or 34 but is malfunctioning enough to set a 32.
    A bad MAP sensor will also make your truck run like crap.
    Also check the vacume line to the MAP sensor.
    The MAP sensor has a direct affect on the EGR system because it is one of the sensors that the ECM uses to monitor EGR fonction.

    Heres some good info on EGR problems and operation: EGR Tech stuff
    Hope it helps
     

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