Timing trouble on 94 Chevy.

[94whitechevy]

I have a 94 Chevy truck with a tbi 350 engine with shorty headers,Edelbrock intake, Holley unit, MSD coil and aftermarket cam shaft. The problem that i am having is the timing. Have set the timing to 0 degrees top dead center on the compression stroke. the problem i have is that i am getting a back fire coming through the tbi unit. Then when i retard the timing by turning the distributor. i get a sputter in the exhaust. I looked on YouTube for a video how to set then timing. they are talking about removing a chip before setting the timing. I am wondering were that maybe. The guy on the video said that it was located were the fuel pump really is and it is not there. Any help would be grateful.

 

[1997chevydriver]

You are looking for a black wire with a brown trace (or brown with black tracer) on your truck it's inside the cab by the blower motor. Unplug it, start truck, set timing with light, shut off truck, plug it back in, and enjoy

 

[OlSmokie]

On my '90, the wire is in the engine compartment behind a plastic cover over the bus-bar.

 

[1997chevydriver]

On my '90, the wire is in the engine compartment behind a plastic cover over the bus-bar.

On 94s it's inside the cab

 

[94whitechevy]

@1997chevydriver thanks i will try that tomorrow. Hopefully that works because i have tried everything else.

 

[94whitechevy]

So i found the white wire and is on the wire coming from the ecm harness. Going to the coil and there is nothing plugged into to it. Was wondering what happens when there is nothing plugged into it.

 

[94whitechevy]

And what should be plugged into it?

 

[kyviabama]

I have the same white wire on my 94 it is just taped to the ignition and tach wires, not plugged in. Although, I'm not sure what it's for either.

the est timing wire (tan/black) is behind the glove box. Don't remove the dash, just the glove. Mine was easy to spot, not wrapped in the bundle. It has plastic connectors on it.