Question about 1986 Oldsmobile Cutlass Supreme

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1986 olds 307 timing

What do I disconnect to get my timing to show on my car

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  • meckaneck101 Aug 27, 2008

    I have an 84 olds 307, where do you set the distributor an the crank to set the timing? For your info, I am building a trike using a 307 and am ready to set the dist and carb, almost ready to crank up but I need this infor to go further.

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Hi Too Fast 442!

The factory manual states:

1.on the 5.0L VIN (_F_) put EST into by-pass mode by unplugging "set timing" timing connector. Connector is a Tan/Black wire in the harness near the distributer. Set timing and reconnect "set timing" connector.

2. on the 5.0L VIN (_G&H_)
Unplug 4-wire connector at distributor. Set timing and plug in 4-wire connector.

3. on the 5.0L VIN (_Y_) the tune-up decal states to ground C-3*** diagnostic lead. Set timing then remove ground from C-3 diagnostic lead.

*** The location of the C-3 diagnostic lead seems to be a mystery, but I've been told that jumpering the A & B pins on the OBD connector (under dash) will accomplish the same purpose.

Disconnecting the ECM (4-wire connection at distributor) is generally a universal given for that era 307.

I used to have a shop where trick Olds motors were one of my specialties, and I love 'em. I built high performance 350s, 403s, 425s and 455s. An interesting fact is that ALL Olds V-8s share the same engine mounts, and big block motors are only 1/2 inch wider than small blocks... That means that you can fit any Olds motor where your 307 now resides.

I have tuned and rebuilt carbs on several 442 307s, and if attention to detail is observed, they run great!

Hope this is illuminating, good luck, and let us know if you have other questions or comments.

Thanks!
WildBill

Posted on Jun 17, 2008

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