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Unread 10-18-2010, 10:28 AM   #31
creepyjeep420
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1998 TJ Wrangler 
 
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mine was doing that and i replaced the throttle position sensor. helped me.. if you have a check engine light on go to a mechanic and get them to run a diagonistic that should tell you exactly what it is

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Unread 10-20-2010, 06:04 PM   #32
twanger1994
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Quote:
Originally Posted by creepyjeep420 View Post
mine was doing that and i replaced the throttle position sensor. helped me.. if you have a check engine light on go to a mechanic and get them to run a diagonistic that should tell you exactly what it is

I don't have a cel on and I'm sure it lights
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Unread 03-20-2013, 02:40 PM   #33
Erhmagerdjerp
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1997 TJ Wrangler 
 
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I had this same issue on my 97 tj. I replaced the Iac and the tps I replaced the vacuum line (from this fuel rail to the throttle body) I wa at a loss...just for fun I sprayed a little throttle body between the intake manifold and the block. It made the engine stumble and sputter...turns out the bolts holding the intake on were loose...it works fine now so try it out
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Unread 03-20-2013, 02:58 PM   #34
Jerry Bransford
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Thanks for the help, though note the post you responded to was nearly three years old. A big welcome to JF, good to have you here!
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Unread 05-27-2014, 08:06 AM   #35
Bullethead
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Quote:
Originally Posted by Erhmagerdjerp View Post
I had this same issue on my 97 tj. I replaced the Iac and the tps I replaced the vacuum line (from this fuel rail to the throttle body) I wa at a loss...just for fun I sprayed a little throttle body between the intake manifold and the block. It made the engine stumble and sputter...turns out the bolts holding the intake on were loose...it works fine now so try it out
I have replaced my IAC, cleaned the TB 3x and still nothing. I did notice that upon spraying Carb cleaner at the line from the PCV elbow to the Intake Manifold there was a stutter.

Could you show me the bolts you are referring to? I am not sure if I need to replace the vacuum line or what. I am one weekend away from just taking this to the mechanic and washing my hands of this issue. Should I look into replacing the TPS as well? because a new IAC didn't do a darn thing but make it worse.
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Unread 10-18-2014, 11:05 PM   #36
BLAKESTER
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Man this sucks I put a new exhaust my 1999 jeep wrangler , unhooked all the electrical , pulled the manifold to the side replaced the exhaust. put everything back, started it now its full throttle wide open, can some one please help me out on this . THX BLAKESTER
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Unread 10-19-2014, 12:37 AM   #37
Knuckelhead
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Sounds like you didn't get the intake manifold installed properly on the alignment dowel pins. Check the link below... HTH

http://www.jeepforum.com/forum/f9/in...ectly-1045108/
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Unread 10-19-2014, 12:39 AM   #38
Jerry Bransford
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The intake manifold is leaking where it bolts to the head from not having been seated properly.
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Unread 10-23-2014, 08:56 PM   #39
BLAKESTER
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Just wanted to say think's for the help "work's great " took it off an put it back on
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Unread 12-16-2014, 10:01 AM   #40
jtleitner
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High Idle @2000 RPM and a whine like it's sucking air

My 99 TJ 4cyl started to slowly increase the RPM.

First it would (periodically) crank but not start. I had a mechanic replace the Crank sensor and when I got it back, it seemed to work ok. Then a day or so later, I turned a corner a little fast and everything seemed to shut off. I had been having this increasing idle issue and thought I had a vacuum leak. So I finally reached around back of the throttle body (while it was running) and messed a little with the wires. I did this actually looking for a vacuum leak. I must have moved the connections to the throttle body and the thing stopped running and picked back up as I wiggled the wires around.

I pulled the airbox off and discovered the plastic connector lock was broken off both connections. The essence of why my Jeep wouldn't start and more recently stopped running when making a turn. Basically I wasted a lot of money having a crank sensor replaced when all along it was these two loose connector blocks on the back of the throttle body. Arggghhhh.

So that being fixed, I still have an issue with the whistle I'm now getting and the high idle. Reading this thread, I'm thinking it's either loose manifold, broken vacuum line or the Throttle Air motor. I'm taking the thing to a mufflr shop today because the whistle I'm getting started happening around the same time as the higher idle. If that diagnosis doesn't indicate an obvious repair, I'll look into the Throttle Air sensor. I'll let you all know what I find.
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