ecm control?
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Senior Member
Joined: Apr 2016
Posts: 733
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Car: 1991 base firebird
Engine: tbi 305
Transmission: 700r4
ecm control?
i have a 91 305 throttle body injected car. im about to start my engine swap. im changing the injection type and will be using a holly HP ecm. my understanding is that the factory ECM only controls the fuel injection. i want to verify this so i can simply remove the ecm and factory wiring completely and replace it with my new setup.any suggestions from experienced engine swappers is welcome.
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Joined: Mar 2002
Posts: 18,432
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: ecm control?
Fuel injection, spark timing (distributor), emissions equipment (AIR, EGR, CCP, closed loop), fuel pump, and the TCC lockup.
RBob.
RBob.
Member
Joined: Aug 2021
Posts: 418
Likes: 66
From: Central Michigan
Engine: SBC Dart 400 Holley 750 Carb
Transmission: 700R4
Axle/Gears: 28 spline 323 gears
Re: ecm control?
The ecm does a few things. It controls the TCC lockup. The coolant sensor by the thermostat is connected to the ecm to turn the fan on. It might do more.
Joined: Dec 2004
Posts: 16,774
Likes: 1,002
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: ecm control?
tbi ecm doest’t have fan control. There is a cylinder head temp switch on passenger side head that controls the ground side of the relay .
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