1991 Mazda 626 rough idle

1991 MAZDA 626

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Engine Performance problem
1991 Mazda 626 4 cyl Front Wheel Drive 180000 miles
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started recently dies in idle
higher rpms everything ok
checked vacuum hoses, seemed good
all suggestions appreciated

Jun 7, 2008 at 7:41 AM

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MERLIN2021

CAR REPAIR CONTRIBUTOR
17,250 POSTS

Check for sticking EGR and faulty idle air control valve...get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If that doesnt do it, you may need a new idle air control valve, it's bolted to the throttlebody

Jun 7, 2008 at 7:59 AM

RASMATAZ

CAR REPAIR CONTRIBUTOR
75,992 POSTS

Try checking the idle speed control valve and throttle position sensor and airflow meter-

Jun 7, 2008 at 8:05 AM