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Old 02-11-2013, 03:18 PM   #1
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TJ won't start

I've got a problem my tj will not start. Two things to take into consideration is that if throttle is applied it will turn over, but if the throttle is released the engine will stall and is did start twice before this. I talked to my brother and together we think that it could be fuel, spark, compression, or the throttle. I would really appreciate any suggestions to what the problem is. Thanks.

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Old 02-11-2013, 03:23 PM   #2
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So, it will start and run if you apply some throttle, but dies when you let off the throttle?

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Old 02-11-2013, 05:20 PM   #3
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Yes, thats it exactly.
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Old 02-11-2013, 05:30 PM   #4
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Originally Posted by tjag99 View Post
I talked to my brother and together we think that it could be fuel, spark, compression, or the throttle.
The throttle has nothing to do with spark and compression and very little to do with fuel. If your engine won't run at idle, I would suggest looking at the idle air control valve.
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Old 02-11-2013, 05:45 PM   #5
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Where would that be located?
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Old 02-11-2013, 05:55 PM   #6
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It's bolted to the throttle body in the same general area the throttle position sensor is.

The point of it is to allow some air into the engine when you are off the gas. It's worth replacing since you say it won't run unless you step on the gas.
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Old 02-11-2013, 05:58 PM   #7
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either that or your carb is bad
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Old 02-11-2013, 06:05 PM   #8
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Get some throttle body cleaner and clean the throttle body and be sure to clean the IAC valve. It's probably just stuck.
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Old 02-11-2013, 06:59 PM   #9
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either that or your carb is bad
Just curious…has your TJ ever experienced a carburetor problem?
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Old 02-11-2013, 07:56 PM   #10
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I haven't had a single carburetor related issue since I sold my Dauntless powered Jeep and bought the TJ.
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Old 02-11-2013, 08:32 PM   #11
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either that or your carb is bad
Never know TJs had carbs.......
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Old 02-11-2013, 10:40 PM   #12
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Never know TJs had carbs.......
Always believe everything you read on the internet. Especially on automotive forums and dating sites!!!
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Old 02-11-2013, 11:03 PM   #13
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Do TJ's have throttle positions sensors? I figure they do, I just don't want to leave my Lazy boy to verify... If so, grab a ohm meter and check yours. You're looking for a smooth sweep with no dead(high ohm or short) spots.
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Old 02-11-2013, 11:04 PM   #14
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Out of curiosity, did you verify that the battery is putting out enough voltage to run the fuel pump, injectors, etc., AND turn the starter too?

I only ask because that was the first issue I experienced with my TJ and it was battery related.
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Old 02-11-2013, 11:04 PM   #15
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Always believe everything you read on the internet. Especially on automotive forums and dating sites!!!
Genius
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Old 02-11-2013, 11:11 PM   #16
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Do TJ's have throttle positions sensors? I figure they do, I just don't want to leave my Lazy boy to verify... If so, grab a ohm meter and check yours. You're looking for a smooth sweep with no dead(high ohm or short) spots.
Yes. It's more accurate to measure voltage output though, rather than resistance. Maximum and especially minimum (since the TPS generally sees more usage at lower/ closed throttle) voltage are as important as a linear output.
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Old 02-11-2013, 11:14 PM   #17
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Always believe everything you read on the internet. Especially on automotive forums and dating sites!!!
Makes me think of this commercial.
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Old 02-11-2013, 11:25 PM   #18
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just had this problem with my 93 wrangler this morning.... it started but had to rev to keep running then it just died and wouldnt start... waited a half hour and it started only to do the same thing... i replaced all of my vaccum lines even the ones that looked good and started up it sat there and ran better than ever... when you give it gas do you get alot of black smoke, also is it fuel injected?
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Old 02-11-2013, 11:26 PM   #19
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also is it fuel injected
LOL, yes, all TJ's are fuel injected
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Old 02-11-2013, 11:47 PM   #20
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, also is it fuel injected?
All Wranglers 91 and newer are fuel injected.
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Old 02-12-2013, 05:08 PM   #21
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Ok, problem fixed. Turns out that it was a malfunctioning IAC valve.

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