1989 Idle Speed
Thread Starter
Intermediate
Joined: May 2008
Posts: 49
Likes: 0
From: Binghamton NY
1989 Idle Speed
OK, I hear that the idle speed is not supposed to be adjustable in teh 1989 LT1 350.
Just replaced the throttle body with a 52 mm one with the air foil and the lowest RPM I can get it to is 800 with the idle set screw just contacting the throttle linkage plate. Also adjusted the throttle valve to .54 volts.
Does anyone know of a way to lower the idle speed? I read that 450 rpm is the correct speed.
Just replaced the throttle body with a 52 mm one with the air foil and the lowest RPM I can get it to is 800 with the idle set screw just contacting the throttle linkage plate. Also adjusted the throttle valve to .54 volts.
Does anyone know of a way to lower the idle speed? I read that 450 rpm is the correct speed.
Intermediate
Joined: Jun 2008
Posts: 49
Likes: 0
From: Schwarzenau / Austria
It´s a special procedure to set the base rpm of 450. It is discribed in the service manual. Do you have it?
As long the idle air valve is connected it trying to keep the rpm up to 8-900.
As long the idle air valve is connected it trying to keep the rpm up to 8-900.
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From: Pearland Texas
Team Owner
Joined: Jan 2003
Posts: 20,322
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From: Summerland B.C. Canada
If it is a L98 check this tip out : https://www.corvetteforum.com/techti...D=55&TopicID=2
Check it out. Lars's write up doesn't mention to disconnect the EST wire, but it should be done for best results. Here's a blurb from the manual. http://members.shaw.ca/agent86/TB-TPS%2bMin-Idle.pdfThe tan/stripe EST wire/connector is beside the brake booster (engine side)
