Where is the ignition timing bypass connector on a 1994 Chev. Silverado CK2500? After putting in a new distributor, now trying to set the timing. Need to find the bypass connector in order to override computer and set timing manually. HELP!?!?

the book shows chev 4.3 L is a v6 chain driven and the valve timing is correct when the two dots line up with each other
if it is the ignition timing that you are talking about you are probably 180 degrees out in the distributor setting
no 1 piston firing lines the rotor button up at no one HT lead and not no 6
all engines regardless are timed of no piston tdc and chev engines are around the 12 degrees btdc for operation

backfiring is ignition when there is a inlet valve open. check for incorrect firing order or HT leads touching each other.. Check for dirt and carbon tracks inside the distributor cap or cracks in the cap.

-Sounds like bad igniter. But make sure check fuel pressure as well.

Good luck

Mai

Look under the dash on the passenger side. It should be near the firewall. Tan wire with a black tracer.

it might be that when you reassembled it that something is wrong with the lifters.. did you label everyone and put it exactly in the original position? very critical that this be done because of the different wear on the camshaft lobes. all components should be put in exactly in there original positions. this is just a thought.. maybe someone else can come up with an easy fix for you.

WITH ENGINE OFF,LOCATE TIMING BYPASS CONNECTOR,TAN WIRE WITH BLACK STRIPE.IT WILL BE LOCATED ON PASSENGER FIREWALL OR PASSENGER SIDE UNDER DASH IN FRONT OF OR BESIDE BLOWER MOTOR.DISCONNECT WIRE.START ENGINE AND SET TIMING TO O DEGREES BY LOOSENING AND TURNING DISTRIBUTOR AND USING TIMING GUN.RETIGHTEN DISTRIBUTOR AND DOUBLE CHECK TIMING.IF STILL GOOD ,SHUT OFF MOTOR AND RECONNECT TIMING BYPASS CONNECTOR.DRIVE TRUCK AT PARTIAL THROTTLE AND LET OFF BACK TO IDLE TO TEACH COMPUTER.IF YOU DO NOT KNOW HOW TO USE A TIMING GUN YOU ATTACH TIMING WIRE TO #1 CYLINDER WHICH IS DRIVER SIDE FRONT.HOOK POS AND NEG WIRES OF GUN TO BATTERY MAKING SURE TIMING WIRE ON GUN IS FACING TO THE SPARK PLUG. HOPE THIS HELPS

First you have to find the connector that is near the distributor that is close to the firewall. (It could be taped to the outside harness.) What this does is that it puts the computer into base timing mode. Unplug this connector. Once that's done, then you set the timing just like any other vehicle, with a timing light. After timing is set, reconnect the connector and the computer takes over.
Question: was there engine work done to it or is this a high miler and you just changed the timing chain and gears?

PUT THE CRANKSHAFT PULLEY ON THE 0 DEGEES TIMING MARK.IF THE DISTRIBUTOR ROTOR IS NOT POINTING AT THE #1 CYLINDER ELECTROD IN THE CAP U HAVE A BAD TIMING CHAIN.IF IT IS LINED UP CHANGE THE CRANKSHAFT SENSOR.

try timing i set mine at 4 degrees btc,dont forget to unhook your distributor bypass located behind your distributor

on the fire wall pass side or under the heater box along the carpet on the pass side there is a single wire connector you disconnect that.. is the spout timing connector .. that wil put the engine at base timing .. use timing light to see timing and turn the distributor after its loostened if nescessary to adjust it then retughten and turn off engine then reconnect the spout connector you disconnected earlier.. restart and it will be all set the code generated during the disconnection of the spout will not keep the engine light on once its been reconnected and engine restarted....