LT1-LT4 Modifications 1993-97 Gen II Small Block V8

idle very high, help.

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Old Aug 25, 2008 | 09:59 PM
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Default idle very high, help.

my idle is very high, my engine was ran through water a few weeks ago and it all got fixxered, but theres a couple things i need to replace and idk what they are..

my car starts up at 2500rpm..than goes back down to about 1500, which is still very high, and when i put it in drive it will idle at 900-1100....my car will basically drive itself to about 40. my car only runs good when i have the bottom two 02 sensors unplugged. if they are plugged in, it will run very rich. from what ive noticed, it seems like my car is getting too much oxygen...but idk. help me please.

thank you
Evan
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Old Aug 25, 2008 | 10:03 PM
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Can you log your car?
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Old Aug 25, 2008 | 10:05 PM
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if you mean loog like...get into the computer, no..i was thinking about getting a new computer, because mine was wet from the accident. i recently dried it off, but before i took a bunch of pictures to show the insurance, but they wouldnt pay for it.
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Old Aug 25, 2008 | 10:23 PM
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BUMP, i want to try to figure this out before tomorrow so i can get it done early and quick.
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Old Aug 25, 2008 | 10:28 PM
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It seems like it would throw codes. If you cant log it I would say something is wrong. Is the SES light on? It sounds like it could be a pcm problem. Especially if it got wet or do you mean submerged in water? That woudnt be good but if it got rained on I dont think that would be a big deal. There is a way to test to see if your pcm is bad. Turn the car on and let it idle. Gently yet firmly tap the pcm with a screwdriver if the car idle surges it usually means a bad pcm.
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Old Aug 25, 2008 | 10:33 PM
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ill do that now.
but if not, what do you think is the next thing i should look at? it wasnn't submerged under water, but it did have water in it, and when i turned it upside down and shook it, a bit of water dripped out of it.
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Old Aug 25, 2008 | 10:36 PM
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Checking the TPS voltage would be where I'd start.
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Old Aug 25, 2008 | 10:39 PM
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i replaced my tps the other day..
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Old Aug 25, 2008 | 10:51 PM
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Did you set the voltage on the tps or did you just bolt it on. If you didnt and you need to know how I can look in my manual let me know. TPS would cause it to idle like crap through.
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Old Aug 25, 2008 | 11:11 PM
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pm sent, im about to go to bed so if you dont get back to me before...thanks for your input, i will look into it.
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Old Aug 25, 2008 | 11:52 PM
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my car with bad o2's idle'd while driving, at 2200 rpm........ put some new o2's amd it fixed the problem....... i could also idle my car at about 40mph
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Old Aug 26, 2008 | 08:09 AM
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yeah? think if i disconnect all the 02's it will test that? cuz with all 4 o2's in, the car spits out gas like crazy.
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Old Aug 26, 2008 | 09:16 AM
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dont forget about the IAT as well. Thats what went bad on my car and it had the same symptoms.
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Old Aug 26, 2008 | 09:33 AM
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where is the IAT located?
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Old Aug 26, 2008 | 10:21 AM
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IAT is in your intake lid right before the mass air meter.
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Old Aug 26, 2008 | 11:07 AM
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intake lid... right before the MAF sensor? i'm not familiar with a mass air meter? could you explain a little further?
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Old Aug 26, 2008 | 12:21 PM
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It would be after the MAF headed towards the intake, its a small 2 post sensor on the left side of the rubber elbow.

Your problems sound TPS/IAC related.
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Old Aug 26, 2008 | 12:52 PM
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Clean the IAC and see where that gets you.
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Old Aug 26, 2008 | 01:12 PM
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Damn im sorry I sounded like an idiotttt that is on my car(ls1) sorry. But if you messed with the tps it very well could be it. Maybe you got a bad tps thats why checking the voltage is a good idea. Checking all of these is a good idea. They all tie into the idle. Here is the big question when did it start? right after you put on the tps or has in been doing this before?

Last edited by cammedss2000; Aug 26, 2008 at 01:22 PM.
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Old Aug 26, 2008 | 11:39 PM
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it was doing it before, but before it would search for an idle like go up n down a bit all the time, now it doesnt do that as much, but it idles very high...i doubt i put it on the wrong way...went to the junkyard today, and they close at ******* 4:30...BS but..ill get off early one day and get the 02 sensors.
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