Thread: timing

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i am new on here and i just did the headgaskets on my truck, its a 89 chevy stepside with a 350 tbi in it. its backfiring when you start it so everyone is saying timing and i have no idea how to set it can anyone help me???

thanks ryan

can anyone tell me how to set the timing on a 89 chevy 350 tbi??

Originally Posted by physco_28

can anyone tell me how to set the timing on a 89 chevy 350 tbi??

It's been awhile....

If I remember right, there is an orange?? wire under the glove box on the passenger side that has to be unplugged. You then set the timing on -0- with a light. Lock it down and plug the wire back up, computer does the rest.

obviously you'll need a timing light
hook it up to the battery and put the inductive pickup (no idea if thats the right name im mad tired) on the #1 plug wire. start the truck and shoot the light at the harmonic balancer and the timing marks should line up. then you can unbolt the distro and turn it to advance or retard the timing.
and these are off the FSC forums,
"Some '87's had TBI, and maybe those had no vacuum advance, like my '88. These would also have the computer wire (at the passenger's side firewall, brown w/ black stripe, I think) that needs to be disconnected at the connector. It's a black connector about the size of a AA battery, that comes out of the wiring harness at the top of the firewall.
Is this a TBI?
The connector you speak of is on the driver's side, runs in conjunction with another harness just under the brake booster. it's a single wire plug. just unplug it to bypass computer's adjustments, set timing to 0 degrees, plug it back in, and you're good to go."
i personally didnt have to anything like that with my TBI 262 when i replaced my distro.
hope this helps man

Originally Posted by camaro_fever68

It's been awhile....

If I remember right, there is an orange?? wire under the glove box on the passenger side that has to be unplugged. You then set the timing on -0- with a light. Lock it down and plug the wire back up, computer does the rest.

damn i just wasted 20 minutes

Does it run or just backfire?

it backfires when you try to start it, but when it does start it still backfires

thank you very much i appreciate it

Are you sure your plug wires are on right? You may have a couple wrong.

usually when it still back fires after it is started its because the plug wires are not in the correct firing order,