I recently needed to check/adjust timing on the same model you have, and had the same question since the service manual (Haynes) gave a location description completely at odds with what I was encountering. A Chevy expert said it was a tan wire with a black stripe located under the dash on the passenger side close to the heater and next to but separate from a larger wire bundle. He was spot on. With the connector unplugged, and engine idling, set the distributor for zero degrees. After locking distributor and a final check, reconnected timing wire and was good to go.
The timing is set on a 98 Chevy Silverado 1500 5.7L by aligning the cam sprocket with the timing chain markings. The engine's computer will then make adjustments on the fly for any additional timing changes needed.
The timing on that year engine is computer controlled. It requires an engine scanner to set the timing. YOU CAN NOT USE A TIMING LIGHT.
That requires a OBDII engine scanner. You can not use a timing light. The timing is computer controlled.
It has a timing chain for sure.
timing chain
It has a timing chain and gears.
You need to disconnect the timing plug for the computer, then time it to zero degrees. Once you plug the timing plug back in, the computer will self time the motor from there.
Yes it will if you know how to use the scanner.
That year did not have one because the timing is computer controlled and can be only adjusted with a Engine SCANNER.
What all does the ECM computer control on my 2006 Chevy k1500 Silverado
It does not have a timing belt. It uses a chain.
It should be 6 degrees before tdc, just make sure you disconnect the distributor's computer control wiring harness before you adjust, and check the timing with a timing gun.