Mechanics

UNWANTED ACCELERATING WHEN AUTOMATIC IS IN GEAR/DRIVE. WHY?

2000 Mazda 626 • 260,000 miles

Got a 2000 Mazda 626 AT Touring, 4 cyl.
When my car is still cold(it happens more frequently when cold), and the transmission is in gear/drive ( its an AT ), and I let my fot of the gaspedal the car sometimes want to do a quick accelerate or jump forward. Its like kangaroo fuel. The rpm goes up and down. But if I quickly brake softly or put shift in neutral the rough rpm sattles and the car runs normal again. I did let my mazdadealer do a diagnostic check but they found nothing suspcious. Can it be the transmission? When I use the "hold" function, from start or at very low speed and doing a kick down, the car feels like it always starts on the second gear. I have cleaned the MAF, changed air filter, sparksplugs etc etc.
// Thx
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MazdaHomer
July 2, 2012.



Check the cold start and IAC. Have them cleaned and the throttle body as well.
Check for vacuum leaks.

KHLow2008
Jul 2, 2012.