Question about 1990 GMC Sierra

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Timing, 89 GMC Ignition timing connector. I disconnected my timing bypass connector. to time my truck. Set Timing to 4 degrees btdc. When I reconnected my bypass connector the mark on my damper should have move dramatically, IT DID NOT MOVE AT ALL. what would cause this to happpen?

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Set it at 12 degrees btdc where it should be
If it has electronic timing it will advance /retard from that point and not as you expect to go to the correct setting

Posted on Mar 07, 2018

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SOURCE: 89 gmc

I time these engines at 4 to 6 degrees BTDC. If there is timing chain wear or if it has higher mileage, I go to 8 BTDC. The extra degrees help with the timing chain stretch.

Posted on Jun 20, 2008

Molson02536

Harvey N Tawatao

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SOURCE: Were is the connector to disconnect for ignition

You have to disconnect the brown wire thats on the firewall. It disables the computer controlled advance and allows you to set the base timing. Disconnect SET TIMING connector (tan/black wire) located in harness close to distributor. DO NOT disconnect 4 wire connector at distributor.
Thank you for using fixya and good luck, set timing is O".

Posted on Jul 17, 2010

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Need spark plugs gap setting and timing setting for 1976 GMC C2500 sierra pickup truck


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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.

0900c1528008e3bd.jpg

Fig. Fig. 2: EST bypass connector

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1 Answer

Were is the connector to disconnect for ignition timing 89 gmc sierra


You have to disconnect the brown wire thats on the firewall. It disables the computer controlled advance and allows you to set the base timing. Disconnect SET TIMING connector (tan/black wire) located in harness close to distributor. DO NOT disconnect 4 wire connector at distributor.
Thank you for using fixya and good luck, set timing is O".

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If you are trying to set the BASE timing, you probably need to connect the orange/red and green/white wires of the blue service check connector with a jumper wire. The blue service check connector is located on passenger side under the dashboard.

The timing mark for this vehicle is on the flexplate / flywheel, and is usually located by removing a little rubber stopper or lifting off an inspection cover.

The timing is PROBABLY 15 degrees BTDC +/- 2 degrees. Be aware that many hondas PRIMARY ignition mark IS 15 degrees BTDC, NOT ZERO... so when you line the pointer and the flash up with the line, it is properly adjusted.

DISCLAIMER: I am (clearly) not a certified auto mechanic. Go check out and read a service manual from your local library. Your mileage may vary...

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89 gmc


I time these engines at 4 to 6 degrees BTDC. If there is timing chain wear or if it has higher mileage, I go to 8 BTDC. The extra degrees help with the timing chain stretch.

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