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Old 08-06-2012, 02:41 PM   #1
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2005 jeep wrangler unlimited automatic high rev then stalling

Hi everyone, my car is currently at the shop and I wanted to see if anyone else has had a similar problem. (btw I have searched the forums already). This first started two days ago, I was driving and went into stop and go traffic where it stalled and I pulled off to the side and thought that I might have a faulty fuel indicator light, I went and got some gas filled it up after about 30 minutes of walking to a gas station. Jeep started up fine and was perfect all the way to my next destination. After about an hour I got back in thinking that I had solved the problem. When I started the vehicle it would rev up to 2500rpms then down to 200rpms and then die. I could keep the rpms up if I applied the gas pedal but wouldn't idle long enough to stay running. I was told that the computer might be the problem so I reset the computer. That seemed to solve the problem... I was able to get it back home that night. The morning I got in the car and same problem with the high revving and then dying. I had it towed over to a mechanic who proceeded to replace my idle speed control motor, throttle position sensor, and idle air control valve. They told me they had test driven it and that it was running fine. I went over there payed for the repairs and when i started it I noticed that it was revving to about 2200rpms and going to about 500rpms on idle which seemed a little low for when it was running well before this. I thought that it was just because I had it worked on and still needed to be worked in. I drove it about 6mi from the shop before I stopped at a stop light and it stalled. Now it is back at the same mechanic where he told me the "new" IAC he had installed was faulty and got a new one put in. However he sees that it is still having the same problems and thinks that the PCM might be faulty and needs replacement. This has already been very expensive repair thus far, do any of you have any idea what exactly could be wrong that that has not been looked into yet?

Please help

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Old 08-08-2012, 11:01 AM   #2
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bump... really need help with this. They still have it in the shop and are now replacing the entirety of my throttle body just to check to see if the computer is bad. I said it would be cheaper to replace the computer but they "assure" me that it would be easier to replace the throttle body because they would have to reprogram the computer, which apparently takes longer and is more expensive...
I feel I am really getting screwed over here. Can anyone help me?

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Old 08-08-2012, 11:07 AM   #3
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This is one of those times when an actual dealership might have been more helpful...

There shouldn't be anything wrong with the throttle body, all it is is a piece of metal that holds the sensors essentially. What your experiencing sounds like an electrical issue, which means bad sensors, or a faulty computer.
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Old 08-08-2012, 11:25 AM   #4
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I would look into the opda. 05 and 06 had a TSB for it. Do a search. Any weird noises coming from under the hood?
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Old 08-08-2012, 11:37 AM   #5
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Vacuum leak? Did you check the breathers and grommets on the valve cover and the associated hoses?
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Old 08-08-2012, 12:07 PM   #6
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Quote:
Originally Posted by Mctim35 View Post
Vacuum leak? Did you check the breathers and grommets on the valve cover and the associated hoses?
Only noise I could hear was after they returned my jeep to me the first time I could hear a high pitched whistle whenever I started the jeep. I told them when I brought it back to the shop that there was a whistling noise from the engine that was probably a vacuum leak. I have never heard of the OPDA problem but I have been at the shop most of today and just made them aware of the possible problem. They are looking into it but assure me it is most likely an electrical problem.
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Old 08-08-2012, 12:09 PM   #7
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I had an old mazda that had similar issue it ended up being the fuel pump. Are you sure it's not a fuel issue? And you could always take tow it to another mechanic. Call AAA

I don't think it'd be the OPDA.
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Old 08-08-2012, 05:51 PM   #8
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Update: After installing a new throttle body and a new IAC there is an apparent loss of power somewhere between the ignition module, the computer, and the IAC. They told me that they have wiring charts and are looking into finding the source of the power loss. My question is why wouldn't they know it was a power problem before replacing all of these parts?
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Old 08-08-2012, 07:26 PM   #9
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Dude...pull the opda and inspect. That is your ignition module. The symptoms you describe are common of a failing opda.
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Old 08-30-2012, 03:36 PM   #10
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Ok everyone, I have a conclusion to this terrible story. I got the car back from the shop and they couldn't fix the problem. They didn't charge me anything for their unsuccessful repairs and let me keep the new parts they installed. I took it to a dealership and they had it for 2 days, called and told me that some of the wires out of my PCM had been chewed, they "pig-tailed" and covered those wires. Then they said the PCM was bad and had to replace that. After replacing the PCM all the problems seemed to have stopped. I have had the Jeep for a week or so since then and no problems with it thus far. I wanted to tell everyone that I appreciate all the help you have given me. Hopefully after all this I can stop repairing things and find things to add to it!

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