Setting minimium idle speed?
Thread Starter
Safety Car
Joined: Sep 2001
Posts: 4,154
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From: Glenbeulah Wi
Setting minimium idle speed?
I am attempting to set my minimium idle speed and I am having some problems. I want my minimium idle speed at 600 RPM to keep the car from stalling when I put it into gear at idle when the engine is hot (when the car is cold it is fine). When the car is warm the engine dies before the IAC has time to react. If I rev the engine slightly and then put it into gear the IAC has enough time to react and the car keeps idleing. The problem I am having is that the minimium idle speed is very touchy. After I ground the diagonistic connector and unplug the IAC I can get the car to idle only by opening the throttle until the idle is at 1000 RPM. When I reduce the minimium idle speed screw to set the idle at 600 RPM the idle speed becomes very sensitive to small changes. The car will be idleing at 800 RPM and a small 1/8 turn of the minimium idle speed screw will drop the idle to 600 RPM and it becomes rough ( I am assuming the cam is causing this, the TPS is fine). I will then reconnect the IAC and let the computer control the idle at 800 RPM. The problem is that it will still stall if I put it into drive at idle? I cannot seem to get the correct setting. Maybe I need a custom chip to compensate for the cam? Maybe I need to disconnect my ignition advance before I attempt to set the minimium idle speed. The ignition advance may be effecting the idle speed more the the IAC causing it to stall. What are your opinions?
Thanks
[Modified by bjankuski, 4:07 AM 1/13/2003]
Thanks
[Modified by bjankuski, 4:07 AM 1/13/2003]
Le Mans Master
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From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
Cruise-In II Veteran
Re: Setting minimium idle speed? (bjankuski)
Yes, disconnect the EST wire after you disconnect the IAC and before you start the engine. I would get a chip anyway with that list of mods. :thumbs:
Team Owner
Joined: Dec 2000
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From: SE NY
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Re: Setting minimium idle speed? (bjankuski)
The metod for setting TPS & min idle is on my site.
Did you clean the IAC and the TB internals? Carbon buildup around the throttle plates could account for the sensitivity at low idle; dirt on the IAC bore could account for slow idle speed response.
With a base idle of 450rpm it should idle at about 800rpm in park and 600-700 in drive.
Before you spend $$ on a chip, add an AFPR to tune fuel to air flow at WOT.
Did you clean the IAC and the TB internals? Carbon buildup around the throttle plates could account for the sensitivity at low idle; dirt on the IAC bore could account for slow idle speed response.
With a base idle of 450rpm it should idle at about 800rpm in park and 600-700 in drive.
Before you spend $$ on a chip, add an AFPR to tune fuel to air flow at WOT.
