Home page

Topic: Idle Speed Control

in Forum: C4 Fuel, Emission Control, and Exhaust Systems

Idle Speed Control (1/4)
 5/7/16 3:27pm
JonJon
Standard Member
Send Private Message

Verona, KY - USA

Vette(s):
'86 Coupe Silver/Grey Manual Trans


Joined: 12/27/2015
Posts: 21

Hey Gang
'86 L98 manual trans.
 
I replaced the worn-out throttle body w/ a BBK 52mm body.  The throttle shaft and bushing hole are worn and the throttle wants to stick at 13-1400RPM.
 
I have the base timing set at 9BTDC and minimum airflow set at 400RPM per the book.  Min TPS is set at 0.5V.
 
When I come to a stop, the idle settles at 1000-1100RPM for 5-7seconds then drops to 6-700RPM. Is this normal for these engines or is the IAC motor a bit slow to drop the idle speed?
 
 
Jonathan.....


|UPDATED|5/7/2016 1:27:55 PM (AZT)|/UPDATED|


______________
Our Sponsors help support C4VR
Re: Idle Speed Control (2/4)
 5/8/16 7:07am
Atchafalaya
Standard Member
Moderator
Send Private Message

Atchafalaya Basin, LA - USA

Vette(s):
Black 1979 L-82 Black 1996 LT1 Black 1999 Coupe


Joined: 3/20/2009
Posts: 571

I have a 96 that does the same thing.....seems normal.
Re: Idle Speed Control (3/4)
 5/9/16 11:28am
cco
Standard Member
Send Private Message

Joined: 8/16/2013
Posts: 191

My '94 LT1 is similar: rpm holds at about 1100 until completely stopped then settles to about 800.
C.
Re: Idle Speed Control (4/4)
 5/13/16 6:57pm
JonJon
Standard Member
Send Private Message

Verona, KY - USA

Vette(s):
'86 Coupe Silver/Grey Manual Trans


Joined: 12/27/2015
Posts: 21

Sounds good.
 
It runs beautiful and pulls stronger with the new throttle body.  Fuel mileage is a bit better also.
 
 
Jonathan.....


______________
Our Sponsors help support C4VR