59 pontiac fouling plugs

[Madandy]

I have a 59 Pontiac Bonneville tripower,  all original.  Keeps fouling plugs. I am using 93 octane with a 108 octane boost to eliminate pinging, but it fouls plugs. Any ideas on how to make my classic car operate correctly?

[TerryB]

Gas fouling or oil?  Do you get black smoke out the exhaust?  How long does it take to foul the plugs? All plugs fouled?  Lots of info needed to attempt a diagnostic.  

[John348]

All of the plugs? What plugs are you using? Are they wet? A picture od the plugs will help.

[Marty Roth]

Are you getting smoke out the tailpipe?

 

Blue smoke after warm-up indicates oil getting past the piston rings and/or valve stem seals

 

Black smoke after warm-up indicates incorrect carburetion with a "Too-Rich" mixture - possibly a stuck or mis-adjusted choke, or blocked air cleaner/carb passages

 

Wet spark plugs may mean too much fuel into the cylinders, but if the plugs are oily, that is a separate issue

[GARY F]

first what kind and number do you have in the car.  I only use A/C in both my Pontiacs.

[rocketraider]

The lead additive may be causing it esp if you're seeing heavy white or grayish deposits on the electrode and insulator.

 

I have a 1963 Oldsmobile Tech Bulletin addressing spark plug lead fouling on Starfire engines. To wit: Starfire engines normally came with AC R43 plugs which are a little on cold heat range side. If these engines were subjected to a lot of low speed operation, the 43 had a tendency to lead foul. Factory recommendation for this condition was to use AC R44 which is one heat range hotter and would burn off the deposits before the plug fouled. 

 

Or you could just use yer high-performance engine for what it was intended...  ?

 

You're sure those end carbs are shutting off when not in use and not letting excess fuel thru? 

 

If condition continues, I'd be inclined to replace points/condenser with a Pertronix ignition, get a slightly more powerful coil and open the plug gaps up to about .040. All hidden and no one will know it's there except you and whoever installed it.

[GARY F]

Here is another one where the poster never gets back.