2002 MAZDA 626
104,000 MILES
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AZEJNATI
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Hi . just got a used mazda 626. with 104k miles…everytime I stop it has a rough idle and the engine shakes like it wants to turn off. the moment I start to drive it goes smooth …there is no check engine light on. so i cant think of why is it happening.. please let me know,,,thank you.
Nov 19, 2012 at 3:33 AM
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KHLOW2008
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Idling speed is too low.
Nov 21, 2012 at 7:00 PM
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AZEJNATI
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can you help me to get the idle speed a little higher? and how high? thank;s please let me know.
Nov 21, 2012 at 10:22 PM
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KHLOW2008
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Which engine do you have?
Try cleaning the throttle body and IAC first.
Nov 22, 2012 at 8:33 AM
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AZEJNATI
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Hi ..it is the 626 2.0 liter... I did clean the throttle body.. it was actually clean.. now I dont know how to raise the idle speed…..[;ease let me know thank you.
Nov 23, 2012 at 3:42 PM
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KHLOW2008
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Refer to diagram.
Image (Click to enlarge)
Attached Media
Nov 23, 2012 at 4:20 PM
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AZEJNATI
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Hi .. and thank you for your advice….the idle is the right timing 650rpm….it still shakes when Im stopped …and I cleaned the IAC valve..could it be the timing belt? the valves? because when I drive it is perfect….please let me know….
Nov 23, 2012 at 9:50 PM
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KHLOW2008
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650 might be too low. Try increasng to 750 and did you use a jumper between the TEN terminal at DLC-1 and ground?

Check the engine mounts, they could be bad.
Nov 24, 2012 at 1:44 PM
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AZEJNATI
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hello....and thank you... the screw for the idle is tightent in max,,, doesn't go more. so i really cant change the idle at all. and what is this jumper you are saying with terminals... i have never heard of it at DLC-1 please let me know...and can you tell if the engine mount are bad just by looking at them?
Nov 24, 2012 at 5:11 PM
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KHLOW2008
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Tightening would decrease the idling speed. You need to turn it outwards.

Refer to link below for information on the DLC-1

https://www.2carpros.com/articles/diagnostic-trouble-codes-for-1995-and-earlier-mazda-cars-obd1

Nov 24, 2012 at 5:24 PM