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What is the correct timing for a 1990 Chevy pickup 4x4 5.7 engine?


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2007-03-20 15:44:22
2007-03-20 15:44:22

18436572 0 degrees BTDC The base timing must be set to 0 degrees with the timing connector conduit disconnected to bypass automatic timing. With timing set to 0 degrees, reconnect the conduit and the computer controles the timing. This conduit is located on the wiring harness on the right side of the firewall, under a Y shaped plastic cover. It is a one wire connection that protrudes from the wiring harness. It is a tan/black stripe wire.


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First place there is no need to set the timing if the distributor has not been moved. And there is no wire to unhook.The ignition timing is controled by the ECM / engine control module. If the timing is off you will have a check engine light on. If the light is not on, then the timing is correct. No need to bother, The computer is taking care of it.You have to have a OBD II engine scanner to set the timing.

A 1976 Chevy did not have a points ignition, but that has nothing to do with the correct timing. You will find that the engine runs best with about 8-12 degrees BTDC.

YES!!! The pistons WILL contact the valves and destroy the engine if the timing is not correct.

This should use a crank sensor- so the timing is controlled by the computer and no adjustment provisions are there.

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separate a timing connector on the firewall in engine bay which allows you to time the engine,then adjust the distributor.The connector is on the drivers side below the cowl and when separated the engine will run differently.

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i needi have an 87 4 +cylender 2.5 Chevy s10 pickup and need the timing diagram in order to get it running. can you help?

There is no way to tell you, because the timing is controled by the computor. You can not use a timing light. It requires an OBD2 engine scanner to set the timing to specs.

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There is no timing ajustment, Its controled by ECM- Computer.

does not have a timing belt it has a chain

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It is bolted into the passenger side of the timing cover that's on the front of the engine. Behind the front bottom pulley/ harmonic balancer on the front of the engine.

1986 should be carburatored and it is not required. That would only apply to a fuel injected engine.

You can not set the timing with a timing light on that year engine. The timing is controlled by the PCM./ Power train control module. You must have an oBD2 engine scanner to set the timing. If the timing is off then the check engine light will be on.If you have not removed the distributor are moved it around for any reason then the engine timing is correct already. No need to adjust it. Computer does it.

The 1.8L engine uses a timing belt, while the 1.4L engine uses a timing chain.

You don't. The timing is adjusted thru the ECM.

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It does not have a timing belt, That engine has a timing chain and gears and they normally last the life of the engine.

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