94 lt1 timing/idle
Thread Starter
Instructor
Joined: Nov 2018
Posts: 120
Likes: 25
From: NJ
94 lt1 timing/idle
My '94 idles right at about 1000rpm. Seems like it could be advanced somewhat? It seems to have a rich smell while driving it, not sure if its possibly due to the timing being advanced or the muffler deletes.
seems like I should be idling a little less than 1000rpms though, thoughts ?
seems like I should be idling a little less than 1000rpms though, thoughts ?
Thread Starter
Instructor
Joined: Nov 2018
Posts: 120
Likes: 25
From: NJ
So a vacuum leak could cause idle to run a little high ? According to the tach it sits right at about 1000rpm and then some at idle.. were should any LT1 (94) generally sit at ? I would think a little under 1000rpm..
Last edited by Brooks94Z07; Dec 3, 2018 at 10:30 AM.
Pro
Joined: Aug 2007
Posts: 668
Likes: 38
From: Austin TX
The idle is dictated by the ECM computer.
My 92 LT1 idles around 800rpms when warm and at a dead stop.
It hangs around 1000rpms when warm and the car is rolling.
It idles at around 1000rpms when cold at a dead stop or rolling.
My 92 LT1 idles around 800rpms when warm and at a dead stop.
It hangs around 1000rpms when warm and the car is rolling.
It idles at around 1000rpms when cold at a dead stop or rolling.
Le Mans Master
Joined: Aug 1999
Posts: 7,339
Likes: 137
From: WilkesBarre PA
Normal Idle should be under 800. With a scanner you should be able to see desired idle, then check from there. Could be leaking thru throttle shaft, cracked vac line, pcv hose, ect. Could be sticking IAC?
Pro
Joined: Aug 2007
Posts: 668
Likes: 38
From: Austin TX
When I thought I had a vacuum leak, I built a homemade vacuum tester made out of a quart can, aquarium pump and a cigar. I got the plans from https://www.r3vlimited.com/board/sho...74418&t=274418
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Melting Slicks
Joined: Oct 2016
Posts: 2,024
Likes: 363
From: Central Alabama
Mt 92 was idling around 1200. I ran it with turner pro on my laptop and it indicated a bad IACV. STEP count was off.
Replaced the IACV and that brought it to 1000.
At some point the DAG coating had been removed from the throttle plates and I had bypass air was getting by. Replaced the throttle body and idle is around 800 at warm idle in neutral. between 625 and 650 in drive.
Replaced the IACV and that brought it to 1000.
At some point the DAG coating had been removed from the throttle plates and I had bypass air was getting by. Replaced the throttle body and idle is around 800 at warm idle in neutral. between 625 and 650 in drive.