Question about 1997 Mazda MX-6

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94 mx6 Rough Idle and very rich

94 2.5Lv6 very hard to start/floods easily;when we take the plugs out the are very black. i have new distributor cap, plugs and air filter. No engine code. Any ideas thanks.

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  • masterwolf42 Feb 05, 2009

    i have same thing i was told it was a vacum leake it is not the idle valve mabe the egr minwe only dose it when it is up to temp i donr know thou



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EGR will throw a code, 02 sensors will throw codes too and the check engine light will come on. Seeing you have a 94 you can check the codes with a paper clip. Check on how to diagnose codes. Seeing your car is so old now someone might have taken out the check engine light to sell it.

Usually if the 02 sensors aren't working properly it will run rich. But my car runs rich all the time.

As for vacuum leaks, if you have an after market Cold air intake check the hoses that go into the elbow. Also, try to keep the VAF level. You might want to take a look at your throttle body plate to see if it has any gaps, I had an aftermarket one and the bronze plate shrunk under the heat. It would idle from 800 rpm to 3500 rpm back and forth.

Try adjusting the Idle air screw if you already haven't. Make sure the intake manifold has no gasket leaks.

Hope all this helps.

Posted on Feb 12, 2009

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Ok so this is what i did i had a cold air and thats when it started bbut here was to much air going in to the moter so i made a mark on the idle ajusment screew on top of the throtal body sorry can spell but i have been a macick for 11 years and you never had to spell lololol so you make the mark with a black maker and the screw in tell the idle levels out and the you have to replace you o2 sensers both up front of the cat and you need a colder spark pulg all this has been tested on my car i have a 95 mx6 gt so i know it works any more questens ask i will test on my car and let you know

Posted on Feb 06, 2009

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Ck coolant temp switch can fail without setting engne code on that old of a car

Posted on Jan 24, 2009

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