Adjusting idle speed?
Thread Starter
Heel & Toe
Joined: Sep 2009
Posts: 19
Likes: 1
From: Tonga, south pacific! far from parts!!
Adjusting idle speed?
My idle is to low at 400-500 rpm how can adjust the idle to 600-700 rpm?
Its a 86 with 145K
Its a 86 with 145K
Last edited by Left Hand Drive; Jul 27, 2010 at 08:27 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
http://www.corvetteactioncenter.com/...and+Idle+Speed
Yours the only C4 in Tonga?
Not too many roads for doing 150mph on ?
Racer
Joined: Apr 2010
Posts: 285
Likes: 0
From: New Prague MN
Idle speed is set by the computer but you can cheat
http://www.corvetteactioncenter.com/...and+Idle+Speed
Yours the only C4 in Tonga?
Not too many roads for doing 150mph on ?
http://www.corvetteactioncenter.com/...and+Idle+Speed
Yours the only C4 in Tonga?
Not too many roads for doing 150mph on ?
The Tonga Corvette Club sounds mighty small.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
If it's an 86 with the original automatic trans, it will jerk into gear at that speed. the 500 is a good number if the idle air control valve is good.
To test the idle air control valve, start the car, let it idle. wait til it lowers the idle to 500 after the self tests are over.
now turn on the air conditioning.......500 RPM's........turn off the air conditioning........500 RPM's.
Turn on the air conditioning.......500 RPM's.....put the car in gear.............500RPM's.
all is good.
If you get 500 RPM's and turn on the air conditioner and the engine dies, the idle air control valve is not working. If you put the car in drive and the engine lopes or dies, it's the IAC again.
To test the idle air control valve, start the car, let it idle. wait til it lowers the idle to 500 after the self tests are over.
now turn on the air conditioning.......500 RPM's........turn off the air conditioning........500 RPM's.
Turn on the air conditioning.......500 RPM's.....put the car in gear.............500RPM's.
all is good.
If you get 500 RPM's and turn on the air conditioner and the engine dies, the idle air control valve is not working. If you put the car in drive and the engine lopes or dies, it's the IAC again.
Team Owner
Joined: Jul 2004
Posts: 28,422
Likes: 3,275
From: Hartford WI
If I wanted to change the idle speed for some reason, I would get the guy who programmed my chip to do that. By cheating and forcing it into the speed you want, all you are doing is eliminating the IAC altogether. Fine if you don't have varying conditions.
Why do you want a higher idle? All that does is slam the gear harder.
Why do you want a higher idle? All that does is slam the gear harder.
