the connector is on the right side kick panel behind the cover.
electronic spark timing connector
the location of the connector for setting the timing is located behind the glovebox on this truck not on the firewall as with older efi trucks
your truck does not have a bypass connector
On GM trucks, you need to look under the glove compartment for the wiring harness. look for a single wire with a brown tracer that has a black connector. This is the electronic timing connector. Start the truck, unplug connector, set the distributor timing at zero, tighten distributor, reconnect wire.
The timing spec for that truck is 10-degrees BTDC (with the shorting bar removed from its connector, as shown in illustration 13.4).
That year did not have a EST/ electronic spark timing connector. The timing is controlled by the PCM / Powertrain Controll Module. It requires a engine scanner to ajust the timing. You can not use a timing light.
8 degrees btc Timing should be at 0 degrees ATDC that is factory XXXXXXXXXXXXXXXXXXX You need to set the base timing on any car/truck that has a distributor. There is a tan/black wire that is usually under the dash down low on the passenger's side. This is the Electronic spark timing and the connector has to be apart to set the timing. That will put the computer offline while you set the timing to the specifications. There is usually a decal under the hood. Once the timing is set then reconnect the connector The base timing is set NOW the computer will take over from there
0deg with ESC (tan/black) wire unplugged, on trucks its under the black plastic housing on firewall passenger side of engine compartment, black/tan wire with connector in middle......... unplug wire connector, start truck, set timing to 0deg, shut truck down reconnect wire........done
it is behind the black cover on the fire wall passenger side top it is a one wire connector protruding throught the wiring harness and taped to it. it has one wire tan with black tracer. hope this helps
* Start the engine and run it at high idle until the coolant temperature reaches normal operation temperature on the dash gauge. Turn off the engine and disconnect the timing connector. The timing connector on the C and K series trucks is located on the passenger side of the firewall breaking out of the main wiring harness and is a single wire connector with a tan wire with a black stripe. * Connect the timing light to the battery. The red cable goes to the positive post, and the black cable goes to the negative post. Attach the timing pick-up to the number one spark plug wire. Number one is the front plug on the drivers side. Start the engine, and aim the light at the timing marks while pulling the trigger on the light. The timing on the 89 Chevy truck is 0 degrees with the timing connector disconnected. If the two timing marks you marked with white crayon do not line up, adjust the timing. * Set the timing by loosening the distributor slightly, and turning the distributor while observing the timing marks. When they line up, tighten the distributor. Turn off the engine and reconnect the timing connector, remove the timing light, and test drive to verify the repair.
you don't the ECM will do it for you. xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx You need to set the base timing on any car/truck that has a distributor. There is a tan/black wire that is usually under the dash down low on the passenger's side. This is the Electronic spark timing and the connector has to be apart to set the timing. That will put the computer offline while you set the timing to the specifications. There is usually a decal under the hood. Once the timing is set then reconnect the connector The base timing is set NOW the computer will take over from there.
there is a timing connector, this is usually a tan wire with a black tracer..it is usually located under the carpeting close to the heater cox on the passenger side of the truck