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.
Can you help me to get the idle speed a little higher? And how high? Thank; s please let me know.
November, 22, 2012 AT 8:33 AM
Which engine do you have?
Try cleaning the throttle body and IAC first.
November, 23, 2012 AT 3:42 PM
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.
November, 23, 2012 AT 4:20 PM
Refer to diagram.
November, 23, 2012 AT 9:50 PM
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 .
November, 24, 2012 AT 1:44 PM
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.
November, 24, 2012 AT 5:11 PM
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?
November, 24, 2012 AT 5:24 PM
Tightening would decrease the idling speed. You need to turn it outwards.