LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

When car is warm, TB blades stick open a tad...

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Old 09-22-2003, 12:57 AM
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When car is warm, TB blades stick open a tad...

Why is that? How can I stop it??? I noticed my car idles slightly high, sometimes even at 1100 on my autometer tach when it's warm. Is that normal? Today when it idled high I popped my hood and the TB was not resting on the stop screw so I knew it had not closed all the way, I pushed it back it idled normally at 925 or whatever it is.

Could it be an IAC problem? I really don't know. The TB is only a couple months old and it's a nice piece by NOMAD.

Also, it might just be me, but since I had the TB it seemed like when I went to press the gas it would stick a little before it moved, like when it's at 0% throttle and I try to move the TB by hand it feels like there is a small resistance to overcome that goes away once they are cracked. It's weird... I would think that the stop screw is not out far enough but it can't be because it idles high when the blades don't close fully and if I press the blades back manually the idle goes down. How can I fix this??

Also (last thing), is there a way to test the TPS to make sure it working as it should? Sometimes crusing at light throttle it sometimes bucks, out of that sometimes it's usually a very very discrete buck that only I can usually feel but sometimes it bucks noticeably.
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Old 09-22-2003, 11:37 AM
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ttt
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Old 09-22-2003, 12:17 PM
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I know on mine it was sticking. I removed it and cleaned it, there was a ton of carbon on the back side that i could not see when it was installed. This did the trick for me.
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Old 09-22-2003, 04:32 PM
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TTT I clean all that stuff regularly so it is not able to get dirty. I will try it just incase when my engine cools doubt but I highly doubt that to be the problem.

EDIT: After a highway ride to school I noticed when I got off that the throttle was stuck barely open... if that helps anybody.
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Old 09-22-2003, 04:46 PM
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It's gotta be some kind of physical obstruction or linkage problem. It's not the IAC because its not physically attached to the throttle plates. Maybe there is a minor defect in the throttle body that is hard to see.
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