Question about 1986 Oldsmobile Cutlass Supreme

1 Answer

1986 olds 307 timing

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

Posted by on

  • 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.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 97 Answers

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.


Posted on Jun 17, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My parisienne back fires in the engine sometimes when I am quick accelerating the engine. what causes this?

it can be ignition timing off a little, it could be lack of fuel under acceleration, worn timing chain, EGR valve opening too soon causing a lean condition.

Jul 28, 2015 | 1986 Pontiac Parisienne

1 Answer

Ignition timing

What's the problem?

Sep 19, 2012 | 1986 Buick Regal

1 Answer

I have a 1986 cutlass with a 307 I'm trying to

Yes there is a bolt and a clamp. Follow the distributor shaft donw to the block and you should find it.

May 14, 2011 | 1986 Oldsmobile Cutlass Supreme

2 Answers

What motor is in a 86 cutlass supreme 4dr sedan

They had several available for that year it looks like a V-6 model and several V-8 models. I have attached the link for your review. Either copy the link or paste it into your web browser. Here is the link:

I hope this helps you out and if it does please give me a YES on the web page you just received my response on. Thank you

Apr 12, 2011 | 1986 Oldsmobile Cutlass Supreme

1 Answer

What plugs are proper for a 1986 olds cutlass 305

AC Delco plug# 41-630 is the OEM plug for your 307 V8 Cultass Supreme.

Jan 18, 2011 | Oldsmobile Cutlass Cars & Trucks

1 Answer

Can u tell me what engine goes in my 86 olds cutlass supreme?

mines is a its a 5.0 liter 307..u can tell on ur vin number should have an h or y check ur manuel for the complete list...

Aug 06, 2010 | 1986 Oldsmobile Cutlass Supreme

1 Answer

Timing mark

Go to and register for full free online repair manual with everything you should ever need.

Sep 16, 2009 | 1986 Oldsmobile Cutlass Supreme

1 Answer

Fuel tank size 1986 cutlass supreme brougham


Sep 11, 2009 | 1986 Oldsmobile Cutlass Supreme

1 Answer

Carb loading up and engine surges at idle

I called an old mechanic friend who confirmed what I suspected. The engine control module which controls timing was the culprit. I replaced the defective unit, and the car runs like new.

Nov 17, 2008 | 1986 Oldsmobile Cutlass Supreme

3 Answers

1986 cutlass supreme brougham

my signal lights (all 4) quit working, hazards still work, changed relay for hazards, didn't fix problem. checked bulbs, all good??? anyone have an idea

May 20, 2008 | 1986 Oldsmobile Cutlass Supreme

Not finding what you are looking for?
Cars & Trucks Logo

1,376 people viewed this question

Ask a Question

Usually answered in minutes!

Top Oldsmobile Experts


Level 3 Expert

77932 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8830 Answers

Are you an Oldsmobile Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides