Need help locating EST for 90 IROC
Joined: Sep 2003
Posts: 25,895
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Need help locating EST for 90 IROC
only places i know of are behind the passenger side strut tower, or behind the intake manifold near the distributor, more on the drivers side or so.
Look there and see what you can find
Look there and see what you can find
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Joined: Jan 2007
Posts: 684
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From: Mesa AZ
Car: 87 Firebird, 90 bird coming soon
Engine: 355 Chevy Vortec Heads TPI, LT1 inj
Transmission: 700r4
Axle/Gears: 2.77 posi 9-bolt
Re: Need help locating EST for 90 IROC
It's the flat module that is with your relays on the driver side. It bolts to the bracket and has about 4-6 wires coming out of it. It's flat and the mounting screws are off-set.
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I was under the impression that the speed density TPI had the EST built into the ECM - but, I could be wrong.
Senior Member
iTrader: (1)
Joined: Jan 2007
Posts: 684
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From: Mesa AZ
Car: 87 Firebird, 90 bird coming soon
Engine: 355 Chevy Vortec Heads TPI, LT1 inj
Transmission: 700r4
Axle/Gears: 2.77 posi 9-bolt
Re: Need help locating EST for 90 IROC
You could be right. I forgot that year was speed density. Haven't worked with many of sd systems.
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Joined: Sep 2007
Posts: 322
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From: Bastrop, Tx
Car: 87 Iroc-Z
Engine: 305 tpi
Transmission: 700-r4
Axle/Gears: 3.42
Re: Need help locating EST for 90 IROC
if the module dies it will crank like crazy but you wont hear it try to fire. It sounds real smooth when cranking and cranks a bit faster.
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