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2003 Mazda Tribute Question: Check engine light with check gas cap light -- recurring

 

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sburke1212, 3.0L V6, Chapel Hill, NC, November 06, 2013, 09:05
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After reading this forum, I am wondering if my Tribute's problem is the EGR. I have taken car to dealer and 2-3 other mechanics to fix recurring check engine and gas cap error lights. Over the past 3 or so years, I have bought 2 gas caps and the error still occurs. No one seems to be able to figure it out. Now my car is hesitating a little when I accelerate, too. (Not sure if this is related.)So here's what happens: I get the check engine and gas cap lights cleared every year for inspection, then I drive it abt. 75 miles (per mechanic's direction), then I pass inspection, then within the month the lights come back on. It's ridiculous! But nobody has been able to fix it and they look at me like I am a dumb girl when I say it's NOT the gas cap! So does this sound like an EGR issue and if so, what should I tell the mechanic to do/check?

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  • Answer #1

    cardocIII from Gillespie's Auto Service, November 06, 2013, 12:07
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    The check gas cap light comes on when the system see's an increase in the fuel level in the tank, (fill-up) and it immediately upon start-up runs the large, and medium evaporative system leak tests and what happens is it fails that leak test. It takes three trips to mature into a code when you have that system but it's a pretty solid performance diagnostic. The trick is once that code is pending or matured it blocks any other testing on the evaporative system. The system can't test for a small leak, the vent valve performance, or even the fuel tank pressure sensor or purge valve operation reliably once the system is sure that it has a leak. I would test that system the same way the car does, by pulling it into a vacuum and monitoring the decay of the vacuum pulled. Then by isolating different parts of the system, prove where the leak is, either by stopping the decay, or in combination by smoke testing individual sections. The other thing to think about is that if you do have an EGR issue, it has nothing to do with the evaporative system issue.

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  • Answer #2

    November 06, 2013, 14:06
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    What trouble code(s) does it have for the check engine light? Code number(s)?

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