1979 Toyota Corolla spark plug

1979 TOYOTA COROLLA
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MHAYYAD
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  • 35 POSTS
Engine Performance problem
1979 Toyota Corolla 4 cyl Front Wheel Drive Manual

i have a black smok on spark plug but the performance and the gas usage is very good
i mix the gas 80 octine an 92 octine
10liter 92 and 20 litter 80
what is this back smoke?
Oct 31, 2010 at 7:20 AM
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KHLOW2008
  • CAR REPAIR CONTRIBUTOR
  • 41,814 POSTS
Hi mhayyad,

Black smoke indicate incomplete burning of fuel and it could be excessive fuel getting to the cylinders.

Check if the autochike is opening fully when warmed up. Check air filter for clogging/restriction.
Oct 31, 2010 at 12:22 PM
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