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 correctly.....no 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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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
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Your setting the initial timing,not 34 on the tab

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

0900c1528008e3bd.jpg

Fig. Fig. 2: EST bypass connector

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