1990 idle issue
Thread Starter
Heel & Toe
Joined: Jul 2009
Posts: 22
Likes: 0
1990 idle issue
I have a 90 Vette with 92k original miles. Out of the blue it started giving me idle issues once it warms up. I checked spark plugs, sparkplug cables, vaccume lines, ignition and injectors and yet no joy. Anybody know of what else to check. It idles great until it warms up.
Instructor
Joined: Jun 2008
Posts: 138
Likes: 0
From: Bridgewater Ma.
I have a 90 Vette with 92k original miles. Out of the blue it started giving me idle issues once it warms up. I checked spark plugs, sparkplug cables, vaccume lines, ignition and injectors and yet no joy. Anybody know of what else to check. It idles great until it warms up.
The easiest way to diagnose driveability issues is with the use of a datalogging program. That way you can observe / monitor certain sensors under operating conditions.
Did you ohm your injectors hot & cold?
O2 sensor been replaced?
Fuel pressure?
Le Mans Master
Joined: Jan 2010
Posts: 8,553
Likes: 3
In front of your TB, there's a little hole in the middle on the bottom. VERY easy to get too.
With car running, spray some carb cleaner in the little hole, rev engine, repeat 4-5 times.
Your engine will bog down while doing this, no problem
You're cleaning your IAC.
If this impproves your idle, replace your IAC, or keep it clean.
With car running, spray some carb cleaner in the little hole, rev engine, repeat 4-5 times.
Your engine will bog down while doing this, no problem
You're cleaning your IAC.
If this impproves your idle, replace your IAC, or keep it clean.
Thread Starter
Heel & Toe
Joined: Jul 2009
Posts: 22
Likes: 0
while cold it idles very smooth as soon as it heats up the engine starts to shake like if it was some elcetrical problem or like when you have a carburated car and you have more air than fuel. Just not idling good
Pro
Joined: Feb 2009
Posts: 541
Likes: 60
From: Auburndale Florida 1990 Vert, 6 speed
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