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MG MGA - Spark plug better picture

p parmenter

Not having any luck with photo

p parmenter

Think that's it
p parmenter

I would say too lean on the carbs. Should be a slight tan color.
George G.

As George says and/or timing out?

Steve
Steve Gyles

I have found that with the current unleaded fuel in Australia that spark plug and exhaust pipe colour are unreliable indicators of fuel mixture.
I always use a wide band Lambda sensor to analyse the exhaust gas.

MIck
M F Anderson

Phil,
Definitely too weak, plus our cars need to run richer on today's ethanol fuels too, to avoid overheating.
Regards
Colin
Colin Manley

Hi - thanks for the comments. What effect could the timing have on the spark plug colour? If it was too far advanced could this be the cause?

Phil
p parmenter

Burning too lean. Could burn a valve or worse. Needs to be a light tan or brownish color.

Black is too rich = sooty deposits

Cheers

Gary
79 MGB
gary hansen

Definitely lean.
Bill Haglan

This thread was discussed between 28/12/2015 and 29/12/2015

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