Where do i set the ignition timing for my 1991 chevy 4.3L

Asked by jeeper51 May 09, 2012 at 09:37 PM about the 1991 Chevrolet Astro

Question type: Maintenance & Repair

My Dad built a jeep and put a chevy 4.3 out of a 1991 chevy astro van in it. I am trying to set the timing
but i cant find what degree (in relation to TDC) to set it at. Everything says to check the Emission control
information label for the answer. Can you help me out?

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Kevin answered 12 years ago

most of those are set at zero and thenthe computer did the advanceing as needed while driving

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Bluvnit34 answered 6 years ago

At the front bottom of thr engine you have your harmonic balancer. This has a pretty noticeable groove in it (there's actually 2 of them). On the block in the the same area there's a protruding mark that you line that groove up with. The other groove will be at the 1 o'clock or two o'clock position. Once you have that lined up, the metal strip on the distributor rotor should be pointing at a small #6 on the distributor housing when the cap is off. If it's off just a bit, you have to go under the vehicle again and rotate the harmonic balancer one full time and line the marks up again and you will be in timing.

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