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My 89 honda civic hatchback wont pass emissions. no check engines lights are on and no smoke coming out of the tail piple. it runs good. ive had hoses, pc valves and o2 sensor replaced. also had the throttle body gasket and rev hose replaced. i always have to tap the gas pedal when i start the car to keep it started. can anyone tell what might be causing the failed emssions?

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  • Cars & Trucks Master
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There are procedures for adjusting the idle mixture and speed.
I would start with those. Perhaps that resllve both the idle issue and the emissions issue. See procedures at the link below.
Repair Guides Idle Speed And Mixture Idle Speed AutoZone com

If the car still fails the test after there adjustments, please post the test results.

Posted on Aug 07, 2017

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SOURCE: 2006 pt cruiser idles high with no pcv valve hose connected

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SOURCE: 2002 Hyundai Sonata wont pass smog

CA you can take the car to a referree and get a one time waiver if you have spent a minimum of $450 on repairs not including smog fees. Gives you two years to get it fixed. Smog Referee Call Center
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We've have the same problem with ours. We found the fuel canister needed replaces. It's mounted near the back bumper with straps. The part cost us about 125 bucks and was pretty easy to replace. The trick is to get the bolts out without snapping them.

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