I'd like to figure out what car my ECM came from, because I'm sure it is not original (my engine is not). My car originally came with a v6, and someone swapped in a 305. Then the previous owner swapped in a 350, and I want to know if the ECM is hurting my performance. All of the past engines were carbed, and so is the current 350. I found two numbers on the ECM: one said "serv. no. 1227169" and the other was "16048241". If this is a computer from an LG4 (which i think it is) what can I do to upgrade to something better for a 350 carbed engine. I know that this combo never came stock in a thirdgen, but maybe I could use an ecm from another model car or program it somehow. Thanks for any info.
John

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84 Firebird with Trans am ground effects- 350 4bbl GM crate motor (LM1), T-Tops, automatic, K&N filter, 180* thermostat, ram-air hood scoop, flowmaster muffler, Accel cap & rotor, MSD Super Conductor Wires. Coming soon: new interior (grey), rear end work, subframe connectors, polyurethane bushings

 

A performance PROM for the spark curve & the correct jetting / metering rods in the carb should do the job, since the ECM only controls part throttle mixture ratio. Call the local parts dealer & ask them about the ECM part number.

Tim

 

Thanks Tim. So if it does turn out to be an LG4 ECM then I should buy a performance chip for that motor (305 4bbl) and that'll help with my motor, right? (and I should make sure my carb is set up correctly)
John

[This message has been edited by johns84bird (edited October 15, 2000).]

 

That should do it.......

Tim