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Starts-goes right to Wide open throttle

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Old 03-25-2012, 07:26 AM
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Default Starts-goes right to Wide open throttle
I installed a new header,cat, O2 sensors and muffler. When I started it up, the idle scream like it's at WOT but I'm not touching the pedal. Any ideas?
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Old 03-25-2012, 07:31 AM
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Your throttle cable is pinched or something.

If its not the throttle cable pull off the intake and look at the butterfly valve in the throttle body.
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Old 03-25-2012, 07:33 AM
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X2 is your throttle plate closed?
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Old 03-25-2012, 07:37 AM
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Throttle cables are clear- moving normal. I'll have to check the throttle plate. As soon as I start it it goes right to 4000 RPM, ist's strange.
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Old 03-25-2012, 07:39 AM
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It could possibly be a sticking IAC.

When was the last TB cleaning?
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Old 03-25-2012, 07:42 AM
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It's been a while. I tried tapping it to see if it would help but didn't help. I'll remove it and see.
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Old 03-25-2012, 07:46 AM
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Originally Posted by Gee oh Dee
It could possibly be a sticking IAC.

When was the last TB cleaning?
^^What I was gonna suggest^^ It's probably pretty dirty, I also had the same thing happen where the IAC froze this last winter..
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Old 03-25-2012, 07:46 AM
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Intake seated against head? This is a common problem, some headers require the intake to be ground a little.
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Old 03-25-2012, 07:46 AM
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Oh man. I used to have to do that all the effing time! It eventually just stopped, and I completely forgot I used to do that. Funny.
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Old 03-25-2012, 07:49 AM
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Originally Posted by Gee oh Dee


Oh man. I used to have to do that all the effing time! It eventually just stopped, and I completely forgot I used to do that. Funny.

Yeah it's weird some XJ's I've had I never needed to keep cleaning it but on my wifes TJ I swear I do it once if not twice a year....
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Old 03-25-2012, 07:51 AM
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Can it be cleaned with out removing it?
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Old 03-25-2012, 07:52 AM
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Obviously my laziness paid off since it fixed itself.

Buuut since I said this it'll start doing so the next time I start it.
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Old 03-25-2012, 07:54 AM
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It's an APT header, seem to fit good, actually fit really good for a header. I'l tkae a closer look.
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Old 03-25-2012, 07:56 AM
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I had a 89 XJ that would do this once in a while. I would just tap the sensor and it would stop. Tried that on this one and it didn't help.
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Old 03-27-2012, 07:30 AM
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It was teh header hitting the manifold. A little dremel work and she's running great.
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