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Old 06-25-2013, 07:12 PM   #1
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Tj wrangler not running right help!!!!!

I have a 1997 tj wrangler. It doesn't do this all the time but some it will idle up to almost 2000 rpms and it will do it in park and at red light. It will then act like its running out of gas and sometimes chock off. The oil pressure gauge will also not show hardly any pressure sometimes. Then other times its great. What is wrong!!!

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Old 06-25-2013, 07:19 PM   #2
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First off, welcome to the forum!

Normal idle is right around 750, so yes, 2000 is very high.

This along with it dying, screams out that your idle air control valve is going bad. It sometimes gets stuck open(2000 rpm) or closed (dying) if it is worn out.

The oil pressure sending unit may be bad. When is "sometimes"? after start up? is it at the same time every time? or does it randomly work then not work?

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98 TJ sport 4.0L I6 356,000 miles.
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Check out my 5.3 swap in progress here!
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Old 06-25-2013, 09:20 PM   #3
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Thanks man! And yes the oil pressure gauge does this randomly. How much and how hard is that air idler control valve to put In. What does that air idle control valve do and why would it make it cut off?
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Old 06-25-2013, 09:37 PM   #4
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Well, the idle air control(sorry i said air idle control earlier) valve is an electric "valve" that keeps the throttle open enough for the engine to idle. Without this, the engine would, as you have experienced, die without you pressing the gas. This is the problem correct?

see this thread.
http://www.wranglerforum.com/f5/very...dle-52192.html

this is a drawing of it. Over time they get clogged with crap and dirt and lose their ability to open and close. (high idle and low/dying).

The oil pressure gauge, i wouldnt really worry about. Its not a necessity, many newer cars now a days don't even come with an oil pressure gauge.

If you feel the need to make this gauge operate properly, it's most likely the oil pressure sending unit, which sends the electric version of your oil pressure to your gauges.
This is ~$50 from the dealer. You want to buy this part from the dealer because many after market ones from autozone or advanced tend to go kaput after a short time, or even run backwards. Heck, it may even be a loose wire that's your culprit.
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98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
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Old 06-25-2013, 09:45 PM   #5
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Ok last question do u know how hard it is to change the control
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Old 06-25-2013, 09:49 PM   #6
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Sadly, i do not. If i had to guess, it is a torx bit or two holding it down. Im sure its only one or two screws max. I myself have never replaced one. try cleaning it first as jerry suggested in the above thread that i linked you. It might save you $30 and he knows a good deal more about those particular things. Sorry I couldn't be of any more assistance!
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98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
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Old 06-25-2013, 09:57 PM   #7
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Thanks so much for your help buddy
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Old 06-25-2013, 10:01 PM   #8
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I will let you know what I find out!!
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Old 06-26-2013, 05:31 AM   #9
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Sure thing!

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98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
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