The Ford Barn - Checking Spark

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Cape Codder

08-09-2018 08:38 PM

Checking Spark

I have seen several times on this Forum to pull the coil wire out to check for a Spark. They usually go on to say you should have a nice blue spark approx. 1/2" long. So my question is if I don't have a strong spark should the Coill be changed or........?

Thanks for any advice or help!

1955cj5

08-09-2018 09:48 PM

Re: Checking Spark

I had also read about checking the coil...

I finally got around to checking it and my old coil had a weak yellow spark barely 1/4" long..

I replaced the coil and re-tested and I had a hot blue 1/2" or greater spark...big difference.

I think it runs much better now.

I only changed the coil, everything else remained the same.

The old coil is now my spare....

BILL WILLIAMSON

08-09-2018 10:48 PM

Re: Checking Spark

You need to study the BASIC, SIMPLE ignition system to UNDERSTAND HOW it works, then you can do basic, simple tests.
Bill W.

Chuck Sea/Tac

08-09-2018 11:59 PM

Re: Checking Spark

Quote:

Originally Posted by 1955cj5 (Post 1661379)

I had also read about checking the coil...

I finally got around to checking it and my old coil had a weak yellow spark barely 1/4" long..

The old coil is now my spare....

Toss it and buy a new good one, they are cheap. Your old one is failing and may not even get you a few miles down the road.
A bad condenser can have the same symptoms.

old31

08-10-2018 05:08 AM

Re: Checking Spark

x2 with chuck

A few weeks a go I had the same symptoms, changed the condenser and it was fixed.

BILL WILLIAMSON

08-10-2018 09:15 AM

Re: Checking Spark

One of our Guys has a GREAT website for learning. I "think" it's MODELABASICS.COM
Bill W.

katy	08-10-2018 09:24 AM

Re: Checking Spark

Quote:

Originally Posted by BILL WILLIAMSON (Post 1661403)

You need to study the BASIC, SIMPLE ignition system to UNDERSTAND HOW it works, then you can do basic, simple tests.
Bill W.

Ditto

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