Question about Mazda MAZDA3

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My speedometer is fluctuating anytime i let off the gas. as long as i'm accelerating, it does what it's supposed to do. that hasn't affected the way the car drives, though. the other thing that happened is that while i was driving the other day, the engine started to rev up by itself. when i sat at a light, it would go up to about 3000 rpms, then go back down, over and over again. so, i decided to go back home and when i got back to my street, it stopped doing that and started acting normally. i took it to a mechanic and they drove it around and said the only thing they noticed was that the speedometer was doing the up and down thing. they said they wouldnt know what it is unless they could go into the dash. i didn't give permission because i cant afford what they estimated. i'm thinking about taking it to the dealer to let them diagnose it as well.

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  • Aaron Murchison
    Aaron Murchison May 11, 2010

    what year is the car? recent work done to the car? millage? engine light on?

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THE DEALER WOULD BE YOUR BEST BET BECAUSE IT COULD BE SOMTHING AS SIMPLE AS A PCM REFLASH, BUT YOU DO NOT WANT AN AFTERMARKET REPAIR SHOP TAKING YOUR DASH APART. WE HAVE TO FIX THEM A LOT WHEN THE AFTERMARKET SHOPS TRY TO FIX THEM.

Posted on Aug 18, 2009

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