89' 350 tbi timing drops back to 0

Schurkey · Jun 7, 2024

lemccullough said:
89' chevy truck 350 tbi completly stock,

lemccullough said:
I have new plugs, wires, sensors, fuel pump, filter, rebuilt tbi and regulator, distributer, coil, knock sensor and timing chain, cam looked good.

"New" distributor? Did you get the CORRECT knock sensor?

lemccullough said:
i am told a scanner for this year vehicle probably wont tell me much.

Common misconception. A proper scan tool will verify EVERY sensor, and computer output.
Here's a thread describing a proper scan tool connected to an '88 K1500. Posts 14 and 15, but the whole thread is somewhat entertaining.

94 k2500 no low end power and horrible fuel mileage - Automotive Forums .com Car Chat

94 k2500 no low end power and horrible fuel mileage C/K

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lemccullough · Jun 8, 2024

Thanks guys, I feel silly mentioning this, but I was unplugging the wrong wire plug that was further down on the wire loom, the wires are dirty and hard to tell their color. I discovered the ecu bypass tan and black wire/plug under the tee-shaped cover on the firewall. All is good now

someotherguy · Jun 9, 2024

lemccullough said:
Thanks guys, I feel silly mentioning this, but I was unplugging the wrong wire plug that was further down on the wire loom, the wires are dirty and hard to tell their color. I discovered the ecu bypass tan and black wire/plug under the tee-shaped cover on the firewall. All is good now

You might feel silly but that's a whole lot better outcome than it being some other cause.

Richard

89' 350 tbi timing drops back to 0

Schurkey

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94 k2500 no low end power and horrible fuel mileage - Automotive Forums .com Car Chat

lemccullough

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someotherguy

Even more awesome in person

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