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Q: My truck didnot pass smog test for the second time. on 1990 Mazda B2200

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The first smog test became bad,but most of the error were fixed.Today got the second smog test,everything passed,but FAIL-ECS: other emission related components. Then the technitian wrote at the bottom of the results: BLACK SMOKE FROM TAIL PIPE. And was told a good tune-up will help. What can I do to solve the problem when my truck got sparkplugs,air filter,spark plug,wires,rotor and rotor cap replaced about a month ago???? What else should I do to get rid of that black smoke ???? Thanks for helping.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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seek a diag and est from a gold shield station in your area. otherwise you are wasting time and money as you can see
Agreed--black smoke (not bluish-gray) is a sign of running extremely rich.-to much fuel OR not enough air.It needs proper diagnosis. Check your local laws- many states with emissions testing have certain criteria for shops to pass and they can be 'certified' in emissions REPAIR. Emissions and drivability issues are two different things. You don't see to many dragsters getting passed an emissions test , but when they're doing a 1/4 mile in 5 seconds----who cares??(besides the EPA)...............GREG is a 'GOLD SHEILD' station what they call an emissions repair station in CA.?
Go to Autozone and try this no guarantee but it may work for you.
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