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Cam timing this is on my 1991 5.7 small block chevy I can set the timing to zero but when I connect the advance connector it jumps off the timing scale.

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It is should advance when you put the vacuum hose back on the dist. It is advancing the dist. Does the engine perform if so it is good.

Posted on Apr 29, 2017

Testimonial: "there is no vacuum on this model its electronic it's tan and black wire coming from dist i c m and goes back to the cpu. but it should not be advanceing off the degree scale"


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Did you set the computer to Diagnostic Mode by using a paper clip or scan tool connected to the ALDL connector underneath the steering column? Most GM's 1981 and later may need to short pins A & B to set the timing as well as disconnecting the vacuum advance.

See here for ALDL diagram:

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