• Tiny
  • azejnati
  • 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.

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Monday, November 19th, 2012 AT 3:33 AM

9 Replies

  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

Idling speed is too low.

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Wednesday, November 21st, 2012 AT 7:00 PM
  • Tiny
  • azejnati
  • Member

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
  • Expert
  • 41,997 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

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
  • Expert
  • 41,997 posts

Refer to diagram.

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Friday, November 23rd, 2012 AT 4:20 PM
  • Tiny
  • azejnati
  • Member

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
  • Expert
  • 41,997 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

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
  • Expert
  • 41,997 posts

Tightening would decrease the idling speed. You need to turn it outwards.

Refer to link below for information on the DLC-1

http://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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