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Unread 04-05-2005, 12:05 AM   #1
THEKEEB17
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Sick TJ

Hello All,

This is my first real post, so I'm hoping my questions wont be too stupid.....
I've tried using the search, but none of the prior topics seemed to match my problems. If I have missed something, please point me in the right direction....

Anyhow,

A couple of months ago the Jeep started to run really bad. The symptoms were a really rough idle, it would almost stall while at a stop, there was a huge loss of power, and frequently while hitting the gas to accelerate, the Jeep would jerk forward (almost like dumping the clutch) and then lose power all together, going nowhere. Turns out it was a massive crack in the manifold, and I had it replaced.

After getting the manifold replaced, it ran great. In the last couple weeks however, the same symptoms as before have started to come back - though not as bad. It still idles rough, and I still get the same jerking and loss of power when I accelerate. Along with the jerking/power loss is a loud clicking noise. (Its a really vague description, but its the only way I can describe it)

Could this be the 02 Sensor that needs to be replaced? The guy at my local 4x4 shop told me that I would probably need to get the 02 Sensor replaced after fixing the manifold, as well as possibly getting the computer adjusted. But, being on a college budget, I put this off until I had more money........(I know, I'm a moron for putting this off)

Also, whenever I take my foot off of the gas -at any speed- theres a rough jolt/thud that follows. Could this be the motor mounts that need to be replaced?

By the way, dont know if it helps, but I have a '97 Wrangler 4.0L, 80000 miles, no engine mods - only a Flowmaster exhaust. The Jeep has a 3.5 lift and is running 33's.

I'm taking it into the dealership sometime this week, but would appreciate any help/advice/suggestions I can get. Please pardon my ignorance as I'm relatively new to Jeeps and am slowly learning about mechanics etc.

Thanks in advance for any help !

Take it easy

(Sorry for such a long post!)

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Unread 04-05-2005, 06:55 AM   #2
championofblue
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well, i can't really say whats wrong w/ your jeep (not a mechanic myself). But do yourself a favor, if you need a new o2 sensor, replace it yourself, you'll save yourself tons of money (and its really easy, im actually guessing that you know how to do it). Hope all goes well at the dealership, dont let them jip you
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Unread 04-05-2005, 10:25 AM   #3
BNovak
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Have you had the codes pulled by any chance?

Autozone will do it for free. I was having similar issues with jerking and bucking and it turns out it was the throttle position sensor. It went for months before the light ever came on.

Have it checked. It's an easy $30 fix.

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Unread 04-05-2005, 12:01 PM   #4
jackal
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IMO i would go ahead and do a FULL-tune up...YOURSELF!! Replace all o2 sensors, replace spark wires, spark plugs, distributor cap AND rotor, and also get a new TPS (Throttle Positioning Sensor). I have a 97 and it turned out that when I did all of the following fixes, it ran like new....literally. Hope this helps...all of those mods you CAN do yourself.

JackaL
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Unread 04-05-2005, 12:11 PM   #5
Jerry Bransford
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We'll need your TJ's diagnostic codes that are stored in the computer. Turn the ignition key on-off-on three times within five seconds (but not all the way to the Start position) and wait for them to start displaying in the odometer display. It will take several seconds for them to start displaying so be patient. If you did it right, you will at least get a '55' code which is not a trouble code, '55' just indicates no more codes follow. Give us the codes that display and then maybe we can point you in the right direction.
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Unread 04-05-2005, 12:13 PM   #6
THEKEEB17
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Hello all,

Thanks a lot for all the feedback/advice. I really appreciate it.

I havent had the codes pulled yet, but I'm planning on doing it before I take it into the dealership.

I think I'll try getting the codes pulled first, and seeing if its something that I can fix myself, before taking it into the dealership and costing myself a fortune.

I'm not all that familiar with mechanics, but I'm a fast learner and have plenty of people who can help me out, so its worth a try.

Thanks again for the help! Any additional input/advice is greatly appreciated!

Take it easy
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Unread 04-05-2005, 12:16 PM   #7
THEKEEB17
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Quote:
Originally Posted by Jerry Bransford
We'll need your TJ's diagnostic codes that are stored in the computer. Turn the ignition key on-off-on (but not all the way to the Start position) three times within five seconds and wait for them to start displaying in the odometer display. It will take several seconds for them to start displaying so be patient. If you did it right, you will at least get a '55' code which is not a trouble code, '55' just indicates no more codes follow. Give us the codes that display and then maybe we can point you in the right direction.

Thanks Jerry,

I'm in class right now and wont have a chance to do it for the next couple of hours, but I'll try to do ASAP and will post the codes later this evening.

Thanks a lot for your help!

Take it easy
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Unread 04-05-2005, 12:26 PM   #8
Icedfire02
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I'd second a tune up, but I would also check the codes first. I had some of the same problems before on my trans am and it turned out to be a vaccum hose was off. Just a suggestion. Codes will help the most though.
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Unread 04-05-2005, 04:43 PM   #9
THEKEEB17
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Code

Ok,

So I've done the ignition switch toggle thing......

The only number that shows up in the odometer after I toggle the ignition is the number "12". The "Check Engine" light flashes at the same time as well.

Is this a correct code? Or am I doing something wrong?

Any help is appreciated.

Thanks a lot !

Take it easy.
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Unread 04-05-2005, 08:53 PM   #10
THEKEEB17
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Well, I thought that I may have done the ignition switch thing wrong, so I've tried it again... Its still shows the number "12" in the odometer when I toggle the ignition.

Is this a valid code?

Any help on what the code means or where I can find out what it means would be appreciated.

Thanks!
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Unread 04-05-2005, 09:05 PM   #11
ponq
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This should help:

http://www.jeepforum.com/forum/showt...threadid=23788
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Unread 04-05-2005, 09:06 PM   #12
ponq
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12 Direct battery input to PCM was disconnected within the last 50 Key-on cycles.

Actually I don't know if that helps.
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Unread 04-05-2005, 09:13 PM   #13
THEKEEB17
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Quote:
Originally Posted by ponq

Pong,

Thanks a lot for the link. Right before you posted, common sense hit me and I realized that I should probably look it up myself and not waste other peoples time. Thanks a lot for helping me out though.

The Code "12" says that "Direct battery input to PCM was disconnected within the last 50 Key-on cycles.", which is weird because I havent disconnected the battery lately..... (Maybe this has nothing to do with me disconnecting the battery...)

Anyways, if anyone has any other ideas as to what may be wrong, I'd appreciate the input. I'll try a tune up myself first, then take it into the dealership if that doesnt fix it.

Thanks!

Take it easy.
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Unread 04-05-2005, 09:22 PM   #14
Stu Olson
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While a tune up may be in order or the TPS could be getting flakey, I would not waste good money on O2 sensors at this point in time. Your O2 sensors are completely monitored via the engine computer. It can determine if their response time is too sluggish or if there is some other type of problem with them. Any problem with them will illuminate the check engine light and will throw a trouble code. Given the other more probable things that could be happening, I would look into those first.
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