Spark color

[Eccentric Old Guy]

From what I understand, a spark at the plug should be a blue color. What I'm getting is a yellow color.

What can I deduct from the yellow color, and is it a problem?

Thanks
EOG

[Patrick L.]

Ah, that just means you're color blind.

Just kidding.

As long as it seems like a good strong spark you good to go.

[wwirz]

Make sure your point gap is correct.

[CT Jack]

A number of conditions can affect the color the plug spark or discharge. The normal color of a spark plug arc should be bluish white. A yellow colored arc could be the result of one or more of the following:
Incorrect electrode gap
Bad coil (secondary shorting internally)
Poor ground to coil
Weak condenser (capacitor)

[eagle]

How far will the spark jump when holding the coil wire from a head bolt? That'll tell you more than color.

[Eccentric Old Guy]

Sponsored Links (Register now to hide all advertisements)

Originally Posted by CT Jack

A number of conditions can affect the color the plug spark or discharge. The normal color of a spark plug arc should be bluish white. A yellow colored arc could be the result of one or more of the following:
Incorrect electrode gap
Bad coil (secondary shorting internally)
Poor ground to coil
Weak condenser (capacitor)

Originally Posted by eagle

How far will the spark jump when holding the coil wire from a head bolt? That'll tell you more than color.

Thanks for these suggestions.

Sparkplug gap is correct, and new plugs....but, will look into these other things....

eog

[Bob Bidonde]

A yellow spark is indicative of a fault in the hi-voltage side of your ignition. The spark color should be violet / purple.
> Check that the coil hookup is correct and all gaps are correct: Plugs 0.035"; Points 0.18" to 0.022"; Rotor 0.010" to 0.15";
> Check that all of the plastic parts (Coil; distributor body; cap; rotor) are clean and there are no sparks / carbon tracks visible;
> Make sure that the distributor body is well grounded
> If the problem continues, try a new condenser;
> Check that the carbon button on the distributor cap is present;
> Also try a new rotor.