1981 Starts missing after it warms up

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Aug 14, 2012 | 04:06 AM

nipski8771

Thread Starter

5th Gear

Joined: Aug 2012

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1981 Starts missing after it warms up

Hello all. New to these boards though I have used valuable info on here in the past. Here is my problem and I am pretty much at a loss. My 81 runs great when cold but after driving it 20 miles or so it starts to miss or backfire badly under load and idle rough. I am getting no codes from the ecm and no check engine light. Carb was rebuilt about a year ago. Newer plugs, wires, and cap. New 02 sensor and new egr valve. I know how to do the basic stuff but I am not an expert by no means. Any suggestions would be helpful and appreciated.

Aug 14, 2012 | 05:56 AM

74modified

Burning Brakes

Joined: Oct 2008

Posts: 1,037

Likes: 14

From: Mobile Alabama

Quote:

Originally Posted by nipski8771

Sounds like HEI module. You can pull it and have it checked, but I always keep a spare and just swap it out. Couple of screws, couple of min.

Aug 14, 2012 | 07:06 AM

nipski8771

Thread Starter

5th Gear

Joined: Aug 2012

Posts: 5

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Quote:

Originally Posted by 74modified

Sounds like HEI module. You can pull it and have it checked, but I always keep a spare and just swap it out. Couple of screws, couple of min.

I will give it a try, thank you

Aug 14, 2012 | 07:07 AM

Marlin

Drifting

Joined: Aug 2005

Posts: 1,372

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From: Springfield VA

Yea you can get them tested, or use to, at Advance and autozone. Make them run the test at least 2 times. I have seen them test good on 1 cold test but bad on a 2nd.

Aug 14, 2012 | 07:24 AM

nipski8771

Thread Starter

5th Gear

Joined: Aug 2012

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Just to make sure I have this right...this is the coil "block" on top of the distributor cap. Correct?

Aug 14, 2012 | 08:45 AM

wajulia

Instructor

Joined: Aug 2010

Posts: 233

Likes: 18

From: Monrovia Md

no
It is inside the distributor cap. Take the cap off and you will see it. A boomerang shaped gizmo that connects to the external connector on the distributor.