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1979 Toyota Corolla spark plug

Tiny
MHAYYAD
  • MEMBER
  • 1979 TOYOTA COROLLA
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?
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Sunday, October 31st, 2010 AT 7:20 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 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.
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Sunday, October 31st, 2010 AT 12:22 PM

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