high idle issue

[dirtybird]

i replaced the destroyed passenger head gasket on my 95 lt1 m6 formula the weekend before the M&G. ever since then it idles around 1500 at start up then calms to about 1000 when it warms up, which is still high. it's throwing the SES light, which im supposed to be able to read with my laptop and mdi from work with the tech 2 software DL, but it's a PIA and wont work. im gonna try taking it over to one of the local chevy dealers to read it this week. anyone know what this could be tho? i did the vacuum leak test and it passed, im thinking IAC valve but not sure. help?

[SOPES]

everything is plugged in ? the DTC would help in what it is, could be a stuck throttle plate, usually that wont set a ses light though. Maybe the intake has a crack somewhere ?

[meissen]

High idle could be a vacuum leak. If you're sure everything is plugged in, have you tried spraying some carb cleaner around the side you were working on and see if the idle changes?

[dirtybird]

I found a broken wire to the tps, just ordered a new connector pigtail at oriellys, it'll be in I'm the morning, I'll put it on when i get home from work tomorrow. I have a feeling it's the main problem

[dirtybird]

[MENTION=259]BP_Z28[/MENTION]

Rolo recommended i tune my flux capacitor down to about 15-18 jigawatts and it should fix my problem. does anybody closer to me have a tuner i can borrow for the day? im in roseville. mines running 26 at startup and drops to 22-23 when warm, causing my high idle. im assuming it should fix my 88 mph shake too. any thoughts?

[thisisthewayilive]

High idle could be a vacuum leak. If you're sure everything is plugged in, have you tried spraying some carb cleaner around the side you were working on and see if the idle changes?

^ what he said. Had the same problem when I changed my intake. Used the carb cleaner to figure out that it was a vacuum leak, pulled the intake off and rebolted it. Problem solved.

[dirtybird]

i did that test, it passed so no leak. i found a broken wire going to the throttle position sensor so im replacing that pigtail today after work. (the wire was broken 1/2" from connector)

[SOPES]

Sounds like thats the issue, when you do that make sure you clean out the throttle body so it will relearn its idle better

[dirtybird]

Got the new connector on and it idles perfectly! The ses light shut off aswell. I cleaned out the tb as best i could with the tools i had. Next thing now is the oil pressure sensor connector. I have it ordered, but i can't find the other two wires that go to it. I figured the single brown wire i felt poking out of the wire harness was it, but after investigating the open pressure sensor and seeing it had 3 prongs rather than 1, i have to rethink this. What colors are the 3 wires going to the sensor on your guys' cars?

[hoogiesngrinderz]

If I remember right, some years had a single wire and others had 3 wire. Single wire being a sender, 3 wire being a sender and a switch. Pretty sure brown is the wire color for the oil pressure gauge.

[dirtybird]

Well all I have is a brown wire, which prong would i connect it to tho?

[hoogiesngrinderz]

Center wire. 3 wire pigtail should fit the single wire sender. Wire is light brown/tan. They do have single wire pigtails though

[dirtybird]

Awesome thanks. I bought the single wire one first but it didn't fit, so i went and ordered the three prong one. I'll hook it to the center wire tomorrow

[SOPES]

I will look it up tomm when I get to work, I may be able to find it in the GM archives lol

[dirtybird]

That'd be great.