miss at 2500 rpm - JeepForum.com
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post #1 of 7 Old 04-28-2007, 09:55 PM Thread Starter
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miss at 2500 rpm

Well I got a solid week of normal operation after my tranny rebuild and new clutch.

A new problem now, my Jeep (1995 2.5 stick) has a miss at 2500 rpm and a whirring sound is coming from the engine compartment at speeds over 35 mpd but only when I feather the gas. If I'm off the gas it stops and if I'm on the gas it stops it only happens between those times and only while driving. The noise started before the misfire problem. I can't get it to miss revving it in the driveway, it only happens while driving. It sounds great at other rpm. I did a search and found a thread about a bad TPS but I had replaced mine about 3,000 miles ago. I have checked the plugs, wires and cap and I have a fairly new coil.

The whirring noise is similar to the noise the exhaust makes when the cat is broken- up. Before you ask I just replaced the cat and cleaned the old remnants out of the exhaust. I get no codes from the computer.

I know others have experienced the "hard to diagnose problems" that Chrysler has so graciously provided us. I guess it gives me something to do other then drive the Jeep, keeps the miles low.

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post #2 of 7 Old 04-28-2007, 11:34 PM
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I feel your pain, I'm having similar "hard to diagnose Chrysler problems"

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post #3 of 7 Old 04-29-2007, 12:43 PM
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Fuel Pump!!!
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post #4 of 7 Old 04-29-2007, 12:46 PM
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my 2.5 was doing the same
Ended up being the Fuel Pump
Now runs like a charm
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post #5 of 7 Old 04-29-2007, 01:08 PM Thread Starter
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Got new fuel pump and filter a little while ago while trying to figure out an intermitent no start / engine shut off problem. The pump was weak. I reset the computer last night, I'll try driving it again and see if it changes. I'm thinking maybe a vacume leak?

When I figure it out I'll post the answer as I'm sure it is happening or will happen to others. I'm just trying to avoid going to the dealer and getting into the, "lets change this part and see", cycle.
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post #6 of 7 Old 04-29-2007, 04:51 PM
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I once had a random miss, with some bucking of the jeep. It turned out to be a bad TPS. You would know if it was something pluged in the exhaust because you would lose a noticiable power loss.

I would start with checking some of the basics. Make sure all your ignition wires a solidly pluged in. Also pop off the distributor and make sure all of the contacts are clean and not corroded.

Since it only happens at a cretain RPM, I would suspect a bad sensor of some sort. If not the TPS, maybe the MAP?

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post #7 of 7 Old 05-04-2007, 12:38 AM Thread Starter
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It turned out to be the MAT sensor, it ended up showing a check engine light after a couple days (code 23, MAT sensor). I pulled the sensor from the intake and found it was crusted with debris. I cleaned it with carb cleaner, put it back in and my mysterious miss at 2500 rpm is gone. I will be replacing it with a new one soon. I hope this helps someone.
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