Thread: Code 34 in my 92 GP (3.1)

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  1. #1 Code 34 in my 92 GP (3.1) 
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    Hello everyone,

    Coming home on Wednesday when I turned right onto the last road the car stalled. It started right back up but ran with a slight misfire the rest of the way home. The misfiring got worse as I went up my driveway (500 feet at 6% grade). Checked the code and it is 34.

    From what I have read (on another site) code 34 is usually caused by a bad IAC. Thing is, I just replaced the IAC about 30k ago and it has been running fine since (until Wednesday).

    Is there any way to rule out the IAC as the problem? I would hate to think that they only last 30k miles.

    I would also appreciate any suggestions as to what else might be the problem.

    Thanks for your help.
    I am not really a Geologist, well not YET anyways.
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  2. #2 Re: Code 34 in my 92 GP (3.1) 
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    Just to edit the original post:

    While shopping for a new IAC it came to my realization that I actually replaced the EGR valve 30k miles ago, and NOT the IAC.

    I will pick up a new IAC on payday and update if that was the problem.

    Thanks for your time.
    I am not really a Geologist, well not YET anyways.
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  3. #3 Re: Code 34 in my 92 GP (3.1) 
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    Well I said I would update if the IAC was the problem but it was not the problem. After extensive work I finally fixed the code 34. Here is a list of what I did in order, followed by the results:

    Replaced the IAC: code 34 in <20 miles
    Removed and thoroughly cleaned the throttle body: code 34 in <20 miles
    Replaced the air filter: code 34 in <20 miles
    Replaced TPS: code 34 in <20 miles
    Replaced any vacuum lines that looked suspicious: code 34 in <20 miles
    Replaced MAP sensor: no codes in over 1000 miles.

    So apparently, sometimes a code 34 can actually be a faulty MAP sensor.

    Hopefully this saves someone a bit of troubleshooting, since I was unable to find any real help on the internet.
    I am not really a Geologist, well not YET anyways.
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