1986 Honda civic good emissions and gas, bad on timing. why not a pass on smog?

Asked by Nov 25, 2013 at 04:57 PM about the 1986 Honda Civic Hatchback

Question type: General

I have a 1986 Honda civic that passed emissions but failed on timing ( 20 degrees over) it
also gets good gas mileage  about  30 mpg. if I have good emissions and mpg. why is
timing a factor in passing smog?

3 Answers

...yes, well you are not going to get complete combustion unless the timing is slightly before TDC~ why on earth are you adjusting this if I might ask?~

sounds like your timing belt is stretched if you're puttin' it that far ahead~

70,255

Sounds like a knock sensor problem. Not sure what is meant by 20 degrees "over". But a knock sensor can severely retard ignition timing. If you have a vacuum advance unit on the distributor be sure it's not hooked up to intake manifold vacuum. The vacuum hose should plug onto a vacuum port that is above the throttle plates. Not below. You may be severely advancing the ignition timing at idle this way. Intake manifold vacuum is strongest at idle. HTH. -Jim

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