Jeeps running like its out of gas. Please help! - Page 2 - JeepForum.com
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post #16 of 28 Old 09-09-2011, 10:12 PM Thread Starter
steve20
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1994 YJ Wrangler 
 
Join Date: Mar 2010
Location: west chester, pa
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Do you guys think a bad tps could be making it act this way?


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post #17 of 28 Old 09-09-2011, 10:14 PM Thread Starter
steve20
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Quote:
Originally Posted by notmyj View Post
Because of the noise you originally described, I'm still willing to bet its an ignition misfire. Dont forget to replace the wires with the cap and rotor.
Ill be doing the wires too tomorow. I hope your right haha.

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post #18 of 28 Old 09-11-2011, 01:25 PM
Que89YJ
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If it's backfiring then its either the map sensor or something is wrong with the distributor.
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post #19 of 28 Old 09-12-2011, 05:33 PM Thread Starter
steve20
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Still waiting on the correct rotor, apparently jeep decided to use two different types of rotors in 94. I need the gray one with the "wing" everyoe else has the black one with the "slot". Going to quadratec tomorow to hopefully pick it up since they are 2 miles from my house haha, lucky me.

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post #20 of 28 Old 09-13-2011, 09:42 PM Thread Starter
steve20
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Today put in a new cap, rotor, wires, and an air filter. Didn't help my problem at all but the jeep does idle better now. Still getting codes 21 and 52. Hopefully I can get this figured out soon.

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post #21 of 28 Old 09-14-2011, 06:18 AM
oldtime_ironman
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According to my Haynes manual, both codes 21 and 52 are O2 sensor.

.
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post #22 of 28 Old 09-14-2011, 07:18 AM
thunderdan2000
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I had a big problem with hesitation on my jeep for quite a while. I replace a bunch of parts and got nowhere. Just a few days ago I unplugged my front(Upstream?) o2 sensor and it runs like a dream now. The sad part is I am getting better gas mileage. I think it was feeding to much into the engine. I never had an O2 sensor code pop up either.
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post #23 of 28 Old 09-14-2011, 10:12 AM
Que89YJ
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Steve you are blowing O2 faults. It means the gas in the exhaust is more or less then it's expecting. TPS is a possibility but what is most likely is an exhaust leak. Check your exhaust header and manifold. It doesnt take much. A slight crack(Check real close around the collection tubes, missing/loose bolts(especially in the rear by the fire wall) its a common problem. Also, a bad O2 sensor from stock. I would measure that O2 sensor just to be sure. Too many of us here have gotten bad sensors right from the parts store. I mentioned earlier the map as a possible issue. Check the vacuum lines.
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post #24 of 28 Old 09-14-2011, 11:10 AM
thunderdan2000
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Quote:
Originally Posted by Que89YJ View Post
Steve you are blowing O2 faults. It means the gas in the exhaust is more or less then it's expecting. TPS is a possibility but what is most likely is an exhaust leak. Check your exhaust header and manifold. It doesnt take much. A slight crack(Check real close around the collection tubes, missing/loose bolts(especially in the rear by the fire wall) its a common problem. Also, a bad O2 sensor from stock. I would measure that O2 sensor just to be sure. Too many of us here have gotten bad sensors right from the parts store. I mentioned earlier the map as a possible issue. Ckeck the vacuum lines.
Yeah I just noticed after doing an oil change today that I have a giant dent in my exhaust pipe just past my manifold. Explains why I didn't get an O2 code. Check the cheap stuff first.
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post #25 of 28 Old 09-14-2011, 01:38 PM Thread Starter
steve20
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Ok well just went out looked all over for cracks didnt find any. Then is went and tightened every bolt one was loose but still snug so i tightened it. Then I started the jeep and sprayed soapy water on every joint and I didnt get any bubbles. The only possible places for a crack to be present is underneath the collection tubes because i cant see down there. Im gonna go get a piece of small tubing to try and listen through for exhaust or vacuum leaks next. While im working on it I'll Take the throttle body off and clean it up some.

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post #26 of 28 Old 09-14-2011, 03:46 PM Thread Starter
steve20
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Coudln't hear any leaks at all. Cleaned the throttle body and the ais motor. The cleaning helped a little but the problem is still there. Also, when i checked the codes this time 52 came before 21 not sure if that makes any difference.

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post #27 of 28 Old 09-14-2011, 03:53 PM
oldtime_ironman
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Time to measure the O2 sensor, in my opinion.
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post #28 of 28 Old 09-19-2011, 06:22 PM Thread Starter
steve20
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Sorry about taking so long to update. The o2 sensor was bad already. Thanks everyone for your help.

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