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Old 06-02-2009, 08:45 PM   #1
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Hesitation and then dies

My 91 2.5 cylinder w/175K started hesitating and idling rough. After it gets warm and the RPMs approach about 2500 it starts sputtering and then dies. If it sits a few seconds it will start right up but continue more of the same shortly after. It back-fired the first two times and hasn't since but it "diesels" now a little when it dies. Any suggestions? The plugs and wires are only a couple of months old and they check fine. I was thinking timing chain, but wouldn't that cause more obvious idling problems?

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Old 06-02-2009, 09:15 PM   #2
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checked codes

By the way...I checked the codes and got a 14 (MAP sensor?0. What and where is the MAP sensor? The code book says that with that code I should be getting a check engine lamp, but I am not.

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Old 06-02-2009, 09:19 PM   #3
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map sensor is the sensor on firewall above valvecover that has a vacum line or two attached to it. make sure you dont have a vacuum leak.
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Old 06-02-2009, 09:22 PM   #4
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Replace the EGR valve? Sorry, that's my shot in the dark.
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Old 06-02-2009, 10:14 PM   #5
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I thought vacuum leak at first too but I have checked every connection and everything seems tight. At cold start it idles fine and doesn't start the hesitation until it warms up (about 4-5 minutes into driving).

I have read similar folks issues and they found the crank sensors and MAP sensor to be the fault. Anybody had similar experience that can advise me? Thanks for all your input.
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Old 06-03-2009, 07:47 PM   #6
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Replace the MAP sensor and it still stalls out when it warms up. I have checked all the vacuum lines and they seem tight without leaks. I put a gauge to the fuel pressure and it stays at 35, so I don't think that it is fuel related. The codes still give me the MAP sensor. I have also noticed the timing chain slapping more, but it could be because I am spending more time listening to the engine. Anybody have any suggestions? Could it be the crank sensor?
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Old 06-04-2009, 03:14 PM   #7
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Now I have replaced the MAP, coolant temperature, and the crank sensors and still no difference. It is weird that it starts right up, but idles rough after it gets warm. It also studders and when driving and has a noticeable loss of power. Any advice on where to go from here?
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Old 06-04-2009, 07:39 PM   #8
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Had something similar happen to a Durango. Changed the fuel filter and all was well.

Good luck!
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Old 06-04-2009, 09:01 PM   #9
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Fuel filter is new and the fuel pressure stays the same even when it begins studder. Anybody know anything about timing?

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