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HRDRCKN 11-02-2010 09:52 PM

Help! I am pulling my hair out with my jeep's engine cut-off problem
I am hoping that some of you jeep brainiacs out there can help with a suggestion of the problem with my 1992 Jeep Wrangler 4.0 hi-output. Symptoms: backfire from time to time....cuts off when driving, cuts off when idling low (like at stoplights)...however, will start up pretty much immediately after it cuts off. Very slow driving speed seems to avoid the cutoff problem (like 10 to 15 mph).
Since this problem starting about 4 weeks ago, we have put new parts in for: distributor, magnetic pick up, crank shaft sensor, and the ignition switch. The ignition switch was replaced yesterday and I had a full day of excellent ++ engine performance, and today, it began the same problem...cutting off when I was driving, and at intersections when engine slows. Just before cutting off, it "burps" like rough engine performance, and then dies.....any help out there...PLEASE!!

Fweaky 11-02-2010 10:03 PM

Backfire usually means rich fuel mixture is igniting in exhaust system. Could be O2 sensors or maybe TPS.

HRDRCKN 11-02-2010 10:07 PM

I was just advised about the TPS today-- although the backfiring seems to be a side-issue with the cutoff problem being my main focus. We did replace the O2 sensor as well. thanks.

444 11-02-2010 10:27 PM

Does it do it at will or only after the engine's good and warmed up and everything under the hood is nice and heat soaked? I've also heard of a fuel pump causing a similar issue. Dying pump or intermittant power/ground to the fuel pump could cause that type of behavior.

HRDRCKN 11-02-2010 10:35 PM

Yesterday morning, we replaced the ignition switch and it ran great all day-- up to this afternoon. Today, the engine was fairly cold, in that it had not been started for at least a couple of hours. I was only about 2 blocks away from home when it started acting up again.

HRDRCKN 11-02-2010 10:35 PM

We did test the fuel pressure and there seems to be plenty of pressure.

damacct 11-03-2010 12:52 PM

TPS corrected all my cranking and shutoff issues.

Seinb 09-08-2011 12:47 PM

could be a wiring issue had some thing like that happen to my ford threw parts at it.
follow and check your wiring harness and all plugs look for chafing and broken plugs or lose wires in plugs. can be time consuming but better than wasting money on parts.

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