1991 SL2 Low RPM Rough and Stall problem

Discussion in 'Saturn S-series' started by Rob, Oct 11, 2005.

  1. Rob

    Rob Guest

    I have a 1991 SL2 that idles very rough when at low rpm, even to the point
    of stalling. The rpm will fluctuate between 500 and 1500. When I put it
    into neutral it does not do this. I have gotten a 26 diagnostic code and
    replaced the PCM and the throttle position sensor, to no avail.

    I would appreciate and ideas on what this may be.
     
    Rob, Oct 11, 2005
    #1
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  2. Rob

    Bob Shuman Guest

    You do not offer much additional information here beyond the symptoms to go
    on: What is the mileage of the vehicle? What is the condition of the
    plugs, wires, ignition tower cap? When was the throttle body and AIS last
    thoroughly cleaned with a good TB cleaner? Was the EGR ever replaced and if
    so at what mileage and age? Is the Coolant Temperature Sender (CTS)
    original equipment? have you looked to make sure all vacuum hoses are
    connected and none are cracked/leaking? These are all things that can
    impact engine idle

    Bob
     
    Bob Shuman, Oct 11, 2005
    #2
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  3. Rob

    Rob Guest

    What is the mileage of the vehicle? 136,500 I have only had it about 2,000
    miles

    What is the condition of the plugs, wires, ignition tower cap? Appear to be
    good

    When was the throttle body and AIS last thoroughly cleaned with a good TB
    cleaner? Unknown, but I am get cleaner fluid.

    Was the EGR ever replaced and if so at what mileage and age? Unknow, but I
    have ordered a new through NAPA.

    Is the Coolant Temperature Sender (CTS) original equipment? Unknown but I
    got a new one today.

    have you looked to make sure all vacuum hoses are connected and none are
    cracked/leaking? All appear to be good.

    I replaced the alternator, which did not work at all, as well as the fuel
    filter, PCM and throttle position switch.

    These are all things that can impact engine idle
    Thank you for the suggestions.

    Rob
     
    Rob, Oct 12, 2005
    #3
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