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99 Mazda 626 LX 147,000 miles with idle issues

Tiny
BXTREME4JC
  • MEMBER
  • 1999 MAZDA 626
Hi! I just bought this car and it was idling at 2,000 rpm. We thought the throtle body just needed to be cleaned, and that helped because before when I wasn't pressing the gas peddle the car stalled because the throtlle was getting stuck. Now when the car is idling (whethere it is in park to drive) the rpm moves around like it is trying to find where it should be between 3,000 and 1,000 rpm and the car kind of shakes. We think that the car might have a vacuum issue going on. Do you have any ideas as to what could be causing this? Thanks!
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Tuesday, November 6th, 2007 AT 2:59 PM

2 Replies

Tiny
KEKEPANIA416
  • MEMBER
  • 3 POSTS
We just had a problem, that sounds a lot like yours, with our '98 Protege. We just had to reset the Idle Speed adjustment in the ECU. It should give you specific instructions in your *repair* manual.
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Wednesday, November 7th, 2007 AT 3:43 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Between 1k and 3k sounds more like a vacuum leak. Look around real close, check the boot between the MAF and the engine for cracks and or breaks
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Wednesday, November 7th, 2007 AT 7:57 AM

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