hello first timer nice to meet you all. can anyone confirm if the esc is built in to the ecm in a 1991 camaro tpi or is it external as i cant locate it. i read some where that it was built in and i was getting a code 43. this car is a 305 car but has been converted to a 350 i also read when you convert that you have to replace the ecm and knock sensor which i thought could have been causing the code. i just replaced the knock and ecm with the ones for a 350 but i seem to have lost some performance and i still got my service engine light coming on anyone have any ideas? thanks for any input

 

My esc module was in the engine bay( before I moved it,,, follow the wire from the knock sensor and it will lead you right to it. IIRC mine was next to the brake booster on the firewall.

 

thanks for the reply i will try that and prove it once and for all

 

The ESC module on a '90 - '92 TPI cars is in the ECM. It is the white board on the MEMCAL. See the sticky above for a picture.

RBob.

 

thanks i definatly have the memcal one. i appreciate the assist