Author Topic: 87 350 tbi 700r04 timing question (Read 1827 times)

Jerr-conn · « **on:** October 16, 2017, 05:55:40 PM »

I want to check the initial timing on my 87 350 tbi. I have read there is a tan/black stripe wire
Near th brake booster that needs to be unplugged before ck' ing timing. I have looked all over
Mine and have only found a tan/ white stripe wire that can be unplugged. Did GM change the
Color code for 87 or do I have to look harder? This wire is located in the area where a clutch
Pedal would be.

bd · « **Reply #1 on:** October 16, 2017, 06:41:28 PM »

Look again. The EST bypass connector on V8 applications breaks out of the engine compartment harness a few inches away from the firewall bulkhead connector just to the left of the brake vacuum booster. It is a single wire Weatherpack connector.

Smitty31 · « **Reply #2 on:** October 17, 2017, 02:39:24 PM »

I know on some models it's under the carpet on the passenger side. Also if you have a vaccum advance you won't have this wire. Just simply unplug the hose and plug. Then set or check timing

Jerr-conn · « **Reply #3 on:** October 22, 2017, 03:47:23 PM »

Found the EST wire. Disconnected it re-set timing. Could not spin tires before, but it sure lights
Them up now. Timing was so retarded. Set it at 2 degrees BTDC. Happy now , except it's almost
Time to put it away for the winter.

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Author Topic: 87 350 tbi 700r04 timing question (Read 1827 times)

Jerr-conn

87 350 tbi 700r04 timing question

bd

Re: 87 350 tbi 700r04 timing question

Smitty31

Re: 87 350 tbi 700r04 timing question

Jerr-conn

Re: 87 350 tbi 700r04 timing question