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TR2 & TR3 Forum

fouling spark plug

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tucsontr3 D. Nic Arrieta
Tucson, AZ, USA   USA
59 TR3a -An guide on a continual fouling of No. 2 spark plug. Does not matter if it Is clean, dirty or new - after a few miles will foul.

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TR3driver Randall Y
Confusion, Los Angeles, USA   USA
Some more information might help, like what does the fouling look like.

If it looks like dry "fluffy" carbon, you've got a mixture problem (which in turn could be caused by a valve problem) or possibly an ignition problem (cracked wire, etc).

But if it looks wet (oily), then you've got oil control problems, like maybe a broken ring.





Randall
56 TR3 TS13571L daily driver
71 Stag LE1473L awaiting engine rebuild
7? Stag awaiting gearbox rebuild

Karls59TR Karl Sisson
Winnipeg,Manitoba,Canada, Canada   CAN
Isn't it true that the plugs will have some some fluffy black carbon when you shut the motor off so it's better to do a plug check by driving the car up to speed put car in neutral,shut off ignition and coast to a stop. That way way you get a plug check without the carbon fouling from slow driving or idling speeds. Different if it's massively fouled as Randall points out.

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