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Code 34 in my 92 GP (3.1)

G

Geologist

New member
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.
 


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.
 
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.
 
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