high idle

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Jul 25, 2003 | 12:45 PM

atotalnincompoop

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Race Director

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high idle

just when i thought that i had replaced every part on my pos '85, i found another, this time it is the air idle motor.
i have changed it and it idled down fairly well, however now it keeps jumping back up to 1800 to 2100 rpm's at idle, occasionally it idles back down to 1000rpm.
wtf??

did i mention how much i hate this car?
thanks Greg :cheers:

Jul 25, 2003 | 01:18 PM

Alcee1

Melting Slicks

Joined: Jul 2003

Posts: 2,719

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From: Los Angeles Ca

Re: high idle (atotalnincompoop)

I had this problem awhile back, I didn't know WTF was going on, took it to my mech. He accessed the computer and found that a sensor that send a signal telling the computer that the car is cold was bad. I forgot which one. Mine would run fine then it would idle up and then down again, I would be at a light and all of a sudden it would go up. Sometimes I would hit a bump in the road and it would go down. Once the sensor got replaced everything was fine. Check it out :seeya

Jul 25, 2003 | 01:25 PM

atotalnincompoop

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Re: high idle (Alcee1)

Quote:

this all sounds familiar :yesnod:
anybody know what sensor it is?

Jul 25, 2003 | 01:31 PM

scorp508

Team Owner

Joined: Mar 2000

Posts: 83,381

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From: Boston, MA

Mine does this now and then. Does turning the car off for 10 seconds and back on fix it? I'm suspecting a failing TPS.

Jul 25, 2003 | 02:58 PM

atotalnincompoop

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Re: (scorp508)

i have a brand new tps, i will try shutting it down and waiting 10 seconds as soon as the rain stops :sad:

Jul 25, 2003 | 06:11 PM

Fast_vette89

Pro

Joined: Oct 2002

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From: tampa fl

Re: high idle (atotalnincompoop)

"did i mention how much i hate this car?"... Dude, I feel/felt the same way. these early C4's can put you in the poor house and then the nut house. I've been F'n with a F'd up idle for MONTHS. Come to find out it's the dam TPS that was "intermitenly" bad. I posted on here, i did this, vacum checks, finally i was scanning it while it was acting up.... TPS V: .33V. !!!! DING !!!
That was it. TPS V was low or hi, or F'd up. Replaced it, reset the idle setting like GM says... the 500RPM in D ...(must do it!!).. runs great now. I was about to beat the poopie out of this thing. relax, step back.... and look again. sometimes the answer is there, but not when we're looking....
:banghead: I know how you feel man. Get a scanner, a must need for these cars.

Jul 25, 2003 | 06:59 PM

Ramanstud

Melting Slicks

Joined: Oct 2002

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From: Cincinnati Oh

Re: high idle (Fast_vette89)

Quote:

Get a scanner, a must need for these cars.

Which one??? They sell cheap-o's at Autozone to check error codes, but what kind of scanners are you talking about?

Jul 25, 2003 | 07:07 PM

ittlfly

Safety Car

Joined: Feb 2002

Posts: 4,212

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From: Sun City West Az

Re: high idle (Ramanstud)

It sounds like your mech was talking about the CTS (coolant temp sensor) located on the front of the water pump.

As far as scanners go, I have the auto xray that I bought @ Kragen same as Schuks (sp). It works well enough but has some limitations. However for the $150 I spent for it, it has paid off.