Question about 1992 GMC G2500

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When you put timing on 4 degrees as the label on the motor says it does not run power. What should the correct timing be for a 92 GMC 6.0 liter motor

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The correct timing would be what the sticker says. However, if there is considerable mileage on the timing chain then your timing would be off even when set with a timing light because the chain will stretch with usage. The more miles on the engine, the more stretch in the chain. To myknowledge there is no formula to determine how much extra advance to use to compensate for that stretch. Advance your timing a couple of degrees at a time until you can find a satisfactory amount of power and still have the engine start easily. If it starts to turn over hard,especially when hot you have gone too far, back your timing off a little. Or you could replace the timing chain and gears as a set. Hopethis helps.

Posted on Oct 07, 2009

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Im trying to time a 350 engine. it has two marks on it and im trying to time it at 34 degrees. One mark is 0 and one is 36 im pretty sure, but they are not labeled. So my question is which mark is which...

You paint or chalk the crank damper grouve first

Then you disconnect & plug the dist vacuum hose

Then you will see the grouve move up on the timing
tab as you turn the dist

Your setting the initial timing,not 34 on the tab

Don't forget the cam turns twice as fast as the crank
& thus the dist & then you add vacuum advance

Your setting the timing somewhere around 8 to 12 degrees
The correct setting should be on the radiator support

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Here is the procedure for setting the timing:
1991-92 Vehicles

See Figure 2
When adjusting the timing, refer to the instructions on the emission control sticker inside the engine compartment. If the instructions on the label disagree with the procedure listed below, follow the instructions on the label.
  1. Locate the timing marks on the crankshaft pulley and the front of the engine.
  2. Clean off the marks and coat them with white paint or chalk, if necessary, so that they may be seen.
  3. Run the engine until it reaches normal operating temperature, then shut off the engine.
  4. With the ignition OFF , connect a tachometer to the distributor, and the pickup lead of an inductive timing light to the No. 1 spark plug wire. Connect the timing light power leads according to the manufacturer's instructions.

WARNING Never pierce a secondary ignition wire in order to connect a timing light. A pierced wire may lead to engine misfiring and driveability problems.

  1. Start the engine. With the engine running at normal operating temperature and all accessories OFF, disconnect the EST bypass connector.

An ECM code will be set when the EST bypass connector is disconnected.
  1. Aim the timing light at the timing mark. The line on the balancer or pulley will line up with the timing mark. If a change in timing is necessary, loosen the hold-down clamp bolt at the base of the distributor. While observing the timing mark, rotate the distributor slightly until the line indicates the correct timing. Use the timing specification on the emission control label in the engine compartment. If this label is missing or damaged, refer to the Tune-Up Specifications chart in this Section.
  2. Tighten the distributor hold-down bolt and recheck the ignition timing to make sure the distributor was not moved when the bolt was tightened.
  3. Turn the engine OFF and remove the timing light and tachometer. Reconnect the number 1 spark plug wire, if disconnected.
  4. Connect the EST bypass connector, then check for and clear the ECM code by disconnecting the negative battery cable for at least 30 seconds.

To prevent ECM damage, the key must be in the OFF position when disconnecting or reconnecting battery cables.


Fig. Fig. 2: EST bypass connector

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