350TBI timing

[89k5]

Hopefully somebody remembers, cause I don't, the proper wire to disconnect to check the base timing on the fuel injected engines. I remember that it is usually brown with a black tracer. I haven't crawled in there yet to check for it, anybody know?

[slammed s10 87]

Originally Posted by 89k5

Hopefully somebody remembers, cause I don't, the proper wire to disconnect to check the base timing on the fuel injected engines. I remember that it is usually brown with a black tracer. I haven't crawled in there yet to check for it, anybody know?

ITS A BROWNISH WIRE UNDER THE GLOVEBOX...ITS THE ONLY ONE WITH A CONNECTOR ON IT-LEE

[BlazerLT]

Originally Posted by slammed s10 87

ITS A BROWNISH WIRE UNDER THE GLOVEBOX...ITS THE ONLY ONE WITH A CONNECTOR ON IT-LEE

What he said!^^^^

[quaddriver]

full size blazer/tahoe or the s10 blahzer? s10s are almost always under the blower duct tucked under the carpet, the bigger stuff differs year to year and is sometimes under the hood by the power distribution center on the passenger firewall

[89k5]

Thanks for the help, I will go check shortly and let you know how it turns out.

[89k5]

O.K., on my fullsize 89 blazer, with 350TBI, 700R4, the brown wire with black tracer is under the hood. The wire is on the driver side, by the firewall, and there is about six inches of wire with a connector sticking out of the wiring loom that comes thru the firewall. I disconnected it and checked my timing, it was about 20 degrees advanced!!! I changed it to the factory stated 0 degrees, tightened the clamp, rechecked it, then shut it down. Disconnecting the wire made the check engine light come on while the engine was running, but after turning off the engine, reconnecting it, and starting it back up all was good. I lost the stumble at about 2800 RPM, but it has a slight cough leaving the stop light, sometimes. Thanks for the help guys.

[BlazerLT]

Yea, you were running really lean there.

The timing wire is for the spark advance and you just reset your timing to zero so it could properly advance the timing.

This would have led to your overheating like you have talked about in the other thread.