EST question
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Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
EST question
I have a small light tan wire right near my coil. When I disconnected it , my tach stopped working. There is also a darker tan wire with a black stripe near my a/c stuff/black box . Which one is the EST wire? I disconnected the one near the coil last time and reset my timing. WTF?
Joined: Sep 2003
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: EST question
the one near your ac box stuff which is darker tan with black wire should be EST wire. thats used to set base timing.
The other wire is the tach signal wire and hence why it stopped working when unplugged
The other wire is the tach signal wire and hence why it stopped working when unplugged
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Supreme Member
iTrader: (2)
Joined: May 2009
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From: Delaware
Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: EST question
So, then what did I set my timing too then? I definately moved the distributor and it runs fine.
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Supreme Member
iTrader: (2)
Joined: May 2009
Posts: 3,371
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From: Delaware
Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: EST question
I know that. I thought at the time i set it to 6 degrees. Then i reconnected that "wrong" wire". LOL. So, it runs better ,but where do you think i actually set it to?
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: EST question
Given the year, total timing at idle is usually around 20 deg. 6 is usually the base. With 6 deg total timing WITHOUT the EST disconnected, then actual base now is probably 14 deg less than 6 
I'd reset it. I wouldnt expect it to run better with that little timing

I'd reset it. I wouldnt expect it to run better with that little timing
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