5.7 tbi swap ecu chip

[jossaavedra82]

I have a 1991 Chevy c1500, originally a 4.3tbi, however I recently swapped to to a 5.7tbi junkyard engine. So far I have got it running and everything seems to be working okay other than it smelling like it is running really rich. From other post I have read about this swap everyone recommends to replace the PROM chip.

My question is if anyone here knows someone who could either program me a chip, or has one that will fit my truck. The truck has a manual 5 speed transmission and the ecu service number is 16144288. I have looked all over ebay and all the PROM chips seem to be for the 4l60 or 4l80 or they seem to be for a different ecu.

 

[PlayingWithTBI]

My question is if anyone here knows someone who could either program me a chip, or has one that will fit my truck. The truck has a manual 5 speed transmission and the ecu service number is 16144288.

According to this, your ECM is for 4.3L engines only.
www.gearhead-efi.com/Fuel-Injection/showthread.php?379-16144288-ECM-Information-AO

You need one like the 1227747 which will run 5.7L as well...
www.gearhead-efi.com/Fuel-Injection/showthread.php?304-1227747-ECM-Information-42

 

[jossaavedra82]

Would you happen to know if it is plug and play. After i get the PROM chips for the 1227747?

 

[PlayingWithTBI]

Would you happen to know if it is plug and play. After i get the PROM chips for the 1227747?

I don't know, I'm not familiar with the 4.3L (or that ECM). You'll have to check the wiring diagrams and, possibly re-pin some. That's no big deal.

It may be time to upgrade your ECM, you'll need the 1227747 and send it in, he'll upgrade it and, with a lot of documentation, you can tune your on your own.

Here it says yours is compatible and may only need one pin moved.

www.dynamicefi.com/EBL_Flash.php