2000 5.7 GSI 1000 rpm idle hunt

homelite

homelite

Petty Officer 2nd Class
Joined
Aug 13, 2002
Messages
156
My above engine idles fine and runs fine. Just off idle, like 900 to 1200 rpm in gear or in neutral, i get a small idle up and down hunt. Timing is correct at 8deg with engine in proper mode for setting timing. No vac leaks. It is slight and a lot of people would never notice, but I do. Hit 1300 rpm and higher it's gone. It's like in that range the IAC doesn't quite know where it wants to be. There no trouble codes either. Just a normal code 12. Any help will be apprecated. Perhaps it can't be fixed.
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 2000 5.7 GSI 1000 rpm idle hunt

Disconnect the throttle cable and see if it slows down. it should be idling at 650 rpm. You won't have a drive long shifting at 11 or 1200 rpm.
What is the full model number (all the letters) or the serial number for your engine?
 
homelite

homelite

Petty Officer 2nd Class
Joined
Aug 13, 2002
Messages
156
Re: 2000 5.7 GSI 1000 rpm idle hunt

I'm sorry Don. When I said idles fine, I meant the speed. It's 600 to 650 and it does not hunt at idle at all. It only hunts a bit just above idle as discribed. I don't have all the numbers off the engine but it is a 5.7 GSI PEFS "charcoal" engine. GM TBI. DP-S drive. It runs perfect and this is very slight. Like I said, most would never notice.
 
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