tbi idle

Reply Subscribe

Thread Tools

Search this Thread

Aug 23, 2004 | 12:17 PM

blackrock68

Thread Starter

Junior Member

Joined: Aug 2004

Posts: 4

Likes: 0

tbi idle

I replaced my battery on my 1988 tbi 305 transam. now the idle is like 200rpm higher than before.Is there a procedure to set it?

Aug 23, 2004 | 01:26 PM

dimented24x7

Supreme Member

iTrader: (2)

Joined: Jan 2002

Posts: 9,962

Likes: 5

From: Moorestown, NJ

Car: 88 Camaro SC

Engine: SFI'd 350

Transmission: TKO 500

Axle/Gears: 9-bolt w/ 3.23's

The idle is non-adjustable. If your voltage was really low due to a bad battery and non-functioning alternator then there is the possibility that the IAC was disabled. How high was it before?

Aug 23, 2004 | 02:01 PM

blackrock68

Thread Starter

Junior Member

Joined: Aug 2004

Posts: 4

Likes: 0

tbi idle

600rpm

Aug 23, 2004 | 02:34 PM

90FormulaWS6

Senior Member

Joined: Feb 2003

Posts: 556

Likes: 0

From: Edison, NJ

Car: 1991 Camaro RS

Engine: 305 TBI

Transmission: WCT5

Quote:

Originally posted by dimented24x7
The idle is non-adjustable. If your voltage was really low due to a bad battery and non-functioning alternator then there is the possibility that the IAC was disabled. How high was it before?

on my TBI i have an idle adjustment... i poped off a little cap and behind it was a hex head screw that i could adjust my idle with

Aug 23, 2004 | 03:11 PM

dimented24x7

Supreme Member

iTrader: (2)

Joined: Jan 2002

Posts: 9,962

Likes: 5

From: Moorestown, NJ

Car: 88 Camaro SC

Engine: SFI'd 350

Transmission: TKO 500

Axle/Gears: 9-bolt w/ 3.23's

Re: tbi idle

Quote:

Originally posted by blackrock68
600rpm

thats where its supposed to be.

That scew is for the min idle adjsutment. Opening it more will just cause the ecm to command fewer IAC counts. Not necesarily a bad thing but none the less itll still idle the same as long as the iac counts are >0

Aug 23, 2004 | 08:13 PM

FirebirdBrtha90

Junior Member

Joined: Mar 2004

Posts: 24

Likes: 0

From: Somewhere just below the Mason/Dixon Line, MD

Engine: 383 stroker in the works

Can anyone give me suggestions about why my '90 TBI Formula idles rough at only 500 rpm? Tune up was performed lest than 3k miles ago. Any help would be greatly appreciated.