Is the ECM adding to much timing at idle?
Thread Starter
Joined: Jul 1999
Posts: 876
Likes: 2
From: St. Louis
Car: RS
Engine: LS1
Transmission: T56
Axle/Gears: 9" for the ladies
Is the ECM adding to much timing at idle?
I set base timing at 4-6* advanced. Reconnected the EST wire and the ECM added 20* or more on top of that. That can't be right can it, at only ~1000RPM's
Would it do this if it detected a lot of extra fuel?
Or it probably would do this if the TPS sensor was reading to high. Right?
Would it do this if it detected a lot of extra fuel?
Or it probably would do this if the TPS sensor was reading to high. Right?
Supreme Member
Joined: Apr 2001
Posts: 1,049
Likes: 0
From: Garland, TX, USA
Car: 1992 Camaro RS & 1992 Camaro RS
Engine: 3.1 L v6 & 305 (5.0L) v8
Transmission: 4L60 Auto
Did you disconect the white wire when you did the timing and when and if you did, did you disconnect the battery to reset the computer memory.
Supreme Member
Joined: Jul 1999
Posts: 5,183
Likes: 42
From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
That may be about right at 1000rpms, once the EST is reconnected the computer will advance timing to the best possible place for complete combustion.
FWIW, with my EST connected at 725-750rpms, my timing is around 14-16*BTDC.
FWIW, with my EST connected at 725-750rpms, my timing is around 14-16*BTDC.
Supreme Member
Joined: Sep 1999
Posts: 3,197
Likes: 10
From: Manassas VA
Car: 04 GTO
Engine: LS1
Transmission: M12 T56
Yeah thats about right, the PROM has about 20' of timing on top of the initial in the idle region. It's completely normal.
...ed
------------------
Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-
- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die
...ed
------------------
Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-
- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die
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