There is a metal box under my dash wired and next to my ECM. It is about half the size of my ECM about 3x5x1". It is silver and has a sticker on it that says BOSCH and has some other numbers on it. Anyone know what this is? Is it my ESC module? I have a 1985 TPI wiring harness on a 350.

 

That's for the Mass Air Flow Sensor burnoff circuit. Basically, after you shut off your car, it supplies 12 volts to the heated wire in the sensor to burn-off any contaminants that may have gotten on it while the car was running. On my 1985 TPI, you can hear a click a few seconds after I shut the car off, signalling that the relay is off.

Kev

 

Ah, thanks. Is there any way to test it with my multimeter because I never hear it do anything when I turn off my car...

 

maybe, but i'm not sure. if it don't set a code, then it should be ok


kev

 

Thats funny, I got one of those boxes off a 91RS parts car that had a 305tbi in it.

Steve