Question about 1991 Chevrolet C1500

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How do i set the distributor timing?

I Change the timing Gear and chain, but i dont know how to put or set the bypass mode so i can set to #1

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Hi stevens-jr,
Make sure that the crank shaft and the cam are both on their respective timing marks....Retention the chain....Once you've done that, check again to make sure that they are still synchronised....If your dealing with coil ignition it's fixed and will be automatically set once the valve timing is set....Any minor adjustments must be made electronically.... If you have a distributor, follow below:-

Once you're sure of the valve timing, set the engine to TDC with number one piston, on the ignition or power stroke... (inlet and exhaust valves both closed) and fit the distributor, so that the rotor is facing the place on distributor where number one plug is situated on the cap....If need be, fit the cap to see the relative position of number one plug....That should give you the relative firing point....Set the distributor by turning it, so that the edge is just stepped away from the pick up coil....the spark takes place as the rotor moves away and breaks the magnetic field between the two....This should happen at about eight degrees before TDC....Once the engine has started, set it with a strobe light...

Best of luck

Regards Johngee10

Posted on Aug 31, 2008

Do not unplug the four wire harness at the distributor.There should be a brown with black tracer wire either behind the t shaped cover on passenger side firewall or under the glove box.Just disconnect the wire to set timing and replug when you got her.

Posted on Nov 04, 2008

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There should be a label under the hood that tells you how to set your timing. Generally, you would disconnect the four-wire connector at the distributor to "bypass" the ECM control. Set your idle and timing.

Posted on Aug 31, 2008

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not sure if #1 cylinder is on the front right or front left. Call a dealer.
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Installation
Before installing distributor , visually inspect distributor . Inspect the O-ring. It should fit tightly and be free of cuts. The drive gear should be free of nicks, cracks and excessive wear. Rotate distributor drive shaft. It should move freely, without binding.
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  1. Install distributor hold-down clamp and bolt. Tighten bolt, but leave it loose enough to rotate distributor .
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