Question about 1994 Chevrolet Suburban

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Did not pass emission test....

Shop owner said it might be oxygensensor,egrvalve or catallicconverter ...need to know great vehicle......

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I had the same problem and mine turned out to be holes and /or cuts in the vaccum lines causing more air to get into the engine and not enough fuel to burn correctly and my egr valve was stuck open. Go to Autozone and tell them to go out with a vacum pump and check for vacum on the egr valve. Between the egr valve and the vaccum lines (about $50 total) it worked.

Posted on Jul 02, 2010

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Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you should have the car diagnosed and repaired. The shop owner should be able to diagnose this for you and give you a solution.

Posted on Feb 02, 2009

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Hi and welcome to FixYa!

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