'92 Jeep Wrangler problems

EVILWOMAN

MEMBER
1992 CHRYSLER 300

Greetings to all! I am new to this forum. I need some advice, please!
My son has a '92 Jeep YJ Renegade, 4.0L/6Cyl, "S" VIN, 150K miles. The Jeep is hard to start, has a continuous "miss" at 2000 to 3000 rpm's, and has lost power. It idles fine, and does not overheat. The battery is okay.
The parts that have been changed are: fuel filter, fuel pump and sending unit, fuel pressure regulator, spark plugs and wires, distributor and cap, rotor and cap, thermostat, all gaskets from the head up, oil pan gasket set, coil, loom, starter, fuel injector cleaner has been added (Sea Foam) and God only knows what else. I told my husband that I could smell fuel inside the cabin, and outside of the Jeep. He can't smell fuel. Could it be that it needs a new O2 sensor?
The engine trouble (idiot lights) do not come on to alert us of any problems with it. We don't know if we may have a bad fuel injector, timing belt may be loose, if we should replace the MAF, EGR valve, or the MAP sensor? My husband wanted to take it in for a diagnostic, but I've heard that with a vehicle that old; the new computers may not be able to detect much at all. Should my husband run another pressure test since changing the head gasket set, and also check the fuel pressure? We are at a told loss.
Thanks! :Shock:
Rose
San Antonio, TX

3 Replies

PALOMA PAUL

MEMBER
14 POSTS

I hope you know the acronym for JEEP stands for Just Empty Every Pocket. It sounds like you have done just that. Jeeps are notorious for wiring going bad. Yous may have a short somewhere in the wiring harness or who knows where. The ECU (engine control unit) may have a bad wiring pin connection at any rate I think its time to take it to a pro. You have probably spent more than it would have cost to have it diagnosed. Those years Jeep have a self diagnosis as well. Buy a shop manuel or better yet a CD off EBay it will tell you how to do the diagnosis and what the codes mean.

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Monday, January 16th, 2006 AT 8:58 PM

EVILWOMAN

MEMBER
5 POSTS

Yes, we have just about emptied every pocket, and then some. This morning, my husband tried to start the Jeep and it would not turn over. No spark so he suspects a bad coil. He replaced with a new one on 12/01/05. New cap and rotor, too. I will have him check for any cracks in the cap.
He ran the battery down this morning as he tried to get it started. The Jeep now needs a new battery. I heard my husband trying to get it started, and I thought, "Man, you are gonna kill that battery!"
We also suspect the Jeep may have a bad cylinder, or a bad fuel injector. I will tell him to check the wiring, too.
My husband bought a Chilton's Manual and that is how he is able to do repairs on the Jeep. Someone suggested a Factory Service Manual. They are about $40 I think. I will check into the E-Bay thing. Thank you very much for responding to my post. God Bless! :Wink:

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Tuesday, January 17th, 2006 AT 10:13 AM

EVILWOMAN

MEMBER
5 POSTS

I was reading up on O2 sensors and such when I stumbled upon a site about possible start-up problems, i.E. No spark. They mentioned the culprit in a lot of cases is a Car Alarm! I lay in bed last night thinking that this may well be a possibility, so early this morning, I called a Car Alarm place. The salesperson told me that the alarm that I have - the Viper, has the ability to kill the alternator, so no spark.
I went outside, pressed the button on the key fob to disable the alarm, it beeped three times. Apparently, it armed itself. When I tried to open the door, the alarm went off. I pressed the button again, got in the car, and tried to start it. If I had any juice in the battery, it should have started up. I am having someone uninstall the alarm system. It's so old, that it may have shorted out and is now malfunctioning. :Roll:

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Wednesday, January 18th, 2006 AT 3:11 PM