92 SL2 Rough Idle, No Codes

Discussion in 'Saturn S-series' started by the_brewmaster, Jul 8, 2004.

  1. I recently replaced the EGR soleniod in my 92 SL2 to try and fix the
    trouble codes 26 and 32 stored on the PCM. I have been driving the car
    for three days and no codes have been reset however my car has started to
    occasionally idle rough, surge while at a stop light, and seems to coast
    like I have cruise control when my foot is off the gas pedal. Any
    suggestions as to what could be causing this? Can it be the EGR valve
    without setting a trouble code?
     
    the_brewmaster, Jul 8, 2004
    #1
  2. the_brewmaster

    Blah blah Guest

    Sounds like a vacuum leak.
     
    Blah blah, Jul 8, 2004
    #2
  3. I just drove the car again and noticed that when the car is decelerating
    the gears seem to shift a little rough (I have an automatic) and if I take
    my foot off the gas pedal at around 10-15 mph the rpm doesn't change and
    the car just coasts at the same speed.
     
    the_brewmaster, Jul 8, 2004
    #3
  4. I was sitting in the driveway with the car in park and the engine was
    idling around 1000-1100 rpm. Once the engine cooling fan kicked on the
    rpm dropped to around 600 and the engine seemed to be running as it had
    before I did anything to it. I checked the vacuum hoses and couldn't find
    anything leaking. Thanks for anyones help in advance.
     
    the_brewmaster, Jul 8, 2004
    #4
  5. Or maybe a stuck EGR valve?
     
    Philip Nasadowski, Jul 8, 2004
    #5
  6. the_brewmaster

    Blah blah Guest

    I thought that but I couldnt remember how exhaust gas effects the idle.
    It might even be trying to re-learn idle control.
     
    Blah blah, Jul 8, 2004
    #6
  7. From the Chilton's I've scanned, a stuck open EGR valve will basically
    cause everything to go wrong. A stuck closed one causes you to fail the
    smog test.

    As a quick aside, anyone know what that funny pump thing under the
    driver's side area of late model Trailblazers is? It's near the ABS (?)
    pump, but has two thick hoses going off to the engine somewhere. I'm
    guessing it's an electric smog pump of some sorts?
     
    Philip Nasadowski, Jul 9, 2004
    #7
  8. the_brewmaster

    Napalm Heart Guest

    If the EGR is stuck open, the engine can't create enough vacuum for
    the engine to start easy or run at idle very well. Huge vacuum leak
    at that point.

    Ken

    <snip>
     
    Napalm Heart, Jul 9, 2004
    #8
  9. Thanks everyone. After a couple empiric tests, it seems that the EGR valve
    is stuck open. Just put an order in for a new one.
     
    the_brewmaster, Jul 9, 2004
    #9
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