Tiny
AZEJNATI
  • MEMBER
  • 2002 MAZDA 626
  • 104,000 MILES
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.
Monday, November 19th, 2012 AT 3:33 AM

9 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Idling speed is too low.
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Wednesday, November 21st, 2012 AT 7:00 PM
Tiny
AZEJNATI
  • MEMBER
  • 32 POSTS
Can you help me to get the idle speed a little higher? And how high? Thank;s please let me know.
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Wednesday, November 21st, 2012 AT 10:22 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Which engine do you have?
Try cleaning the throttle body and IAC first.
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Thursday, November 22nd, 2012 AT 8:33 AM
Tiny
AZEJNATI
  • MEMBER
  • 32 POSTS
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.
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Friday, November 23rd, 2012 AT 3:42 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Refer to diagram.
Image (Click to make bigger)
Thumb
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Friday, November 23rd, 2012 AT 4:20 PM
Tiny
AZEJNATI
  • MEMBER
  • 32 POSTS
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...
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Friday, November 23rd, 2012 AT 9:50 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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.
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Saturday, November 24th, 2012 AT 1:44 PM
Tiny
AZEJNATI
  • MEMBER
  • 32 POSTS
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?
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Saturday, November 24th, 2012 AT 5:11 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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

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Saturday, November 24th, 2012 AT 5:24 PM

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