How do you set the timing on a 1988 chevy scottsdale c1500 305eng
Ok they say there is a single wire by the distributor that is tan with a black stripe but the only tan and black wire i found is hooked up on a four wire prong that goes on the dis i know you have to remove the wire to set the timing but i cann't find it can anybody help?
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To set the ignition timing you will need to disconnect the electronic timing control. It is usually a dark brown and black wire located on the passenger side foot wellwhere the carpet meets the firewall. Once the wire is disconnected, loosen the distributor and set the timing with a timing light. If you have an automatic transmission, I think the timing is 6deg BTDC. Tighten the distributor down and connect the ETC wire.
THE FIRING ORDER IS AS FOLLOWS : 1-6-5-4-3-2.
CYLINDER NUMBERS (front-to-rear) :
LEFT (driver side) 1-3-5
RIGHT (passenger side) 2-4-6
To set ignition timing, ensure that engine is at operating temperature, (190 degrees or above), bypass EST (electronic spark timing) by unplugging the single tan wire with a black stripe from the distributor. Ignition timing should be set at 0 degrees or TDC (top dead center). If not, loosen distributor hold down bolt and adjust, then retighten.
Disconnect SET TIMING connector: The location of the set timing connector is inside the cab where the heater box and the carpet meet on the passenger side floor. Pull carpet back to expose the single wire and connectors on the outside of the control module harness. The wire colors are tan with a black stripe. DO NOT disconnect 4 wire connector at distributor.
Note: The Timing Connector breaks out of the engine wiring harness conduit adjacent to the distributer. It is a single wire sealed connector that has a tan with black stripe lead. Note: Timing specifications are listed on the Vehicle Emissions Control Information label under the hood. Always follow the Vehicle Emissions Control Information label procedures first before using the following procedure.
PROCEDURE: Set timing under the following conditions:
Normal operating temperature.
Air cleaner installed.
Transmission in neutral.
Disconnect SET TIMING connector (tan/black wire) located in the harness close to the distributor. DO NOT disconnect the 4 wire connector at the distributor.
Connect timing light and adjust as necessary by loosening hold down bolt and rotating distributor.
Base Timing, with Manual and Automatic Transmissions: 00(TDC)
Tighten hold down and recheck the timing.
Stop the engine and connect SET TIMING connector.
Clear ECM trouble code by disconnecting ECM power source.
Is this tbi? I'll have to look it up but it should be set at zero degrees with the timing connector unplugged, I think. The timing connector is under the plastic relay cover on the passenger side firewall. It is a single wire plug that the wire is tan with a black tracer. With this unplugged you set the timing mark to the large gap on the timing tab.
If the distributor hasn't been taken out, the timing can be set manually but you have to disconnect the distributor wire behind the glove box inside the cab. Tan wire with white tracer it is taped up to the a multi wire harness but is the only one with a single plug. Disconect the plug and use your timing light on the timing mark to set timing per specs. Rotate the distributor as needed to advance or retartd as required for the correct setting. tighten the dizzy clamp and plug the tan wire back together. The computer will now be fooled asd to what the base timing is and advance from there.
Contrary to popular belief, 96' and up do not have this wire. Timing has to be done with a programmable scanner.
Hope this helps.
There are two plugs which are plugged into the distributor one is a two wire and one is a four wire.
the two wire has a pink wire on terminal A and a white wire on terminal B these two wires go to the remote coil black plug
The four wire has a black wire with a red trace on terminal A
A tan with black trace on terminal B
A purple with white trace on terminal C
A white wire on terminal D