Thread: Chevette blues

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The only adjustment is the throttle stop screw.

The computer controls the mix through duty cycle at a fixed frequency.

Compression checked good.

It runs good at higher rpm, dies if under 1/4 throttle.

I understand the cars reputation, but this used to be a very reliable great running car.

Originally Posted by firebird77clone

The computer controls the mix through duty cycle at a fixed frequency.

That SOUNDS impressive, but WHAT computer? The Chevette didn't come with any type of computer that I recall, just an ECM and it didn't control mixture. I'd put a kit in the old, OEM carb and put it on the Chevette.

Ok, much reading and I finally found in the factory manual that indeed the mixture control solenoid functions at 10HZ controlling fuel air mixture.

Also the ECM has a PROM chip, and is part of what the manual calls the computer command control.

it functions largely on closed loop reference to the 02 sensor. At WOT the throttle position sensor which is a rheostat overrides all input and sets run mode to full rich.

oh, also this vette is an 87.