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C-7 Clanging Noise and black smoke out exhaust when accelerating

41 messages,  Last post on Apr 21, 2009 at 8:03 PM

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What is this discussion about? Mazda CX-7, SUV

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#38 of 41 Re: Mazda CX-7 Rattling or Clanking Noise [slw5] by wc524 Apr 08, 2009 (4:56 pm)
Replying to: slw5 (Apr 01, 2009 7:39 am) Thanks! Shortly after my post back in Sept the technician magically made the noise come up. It's fixed and I do have to agree it's driving like new...there's a noticeable difference in the torque lag (or lack thereof now). Still loving my car as well!
#39 of 41 Re: Fix for the CX7 Clanging Noise in Engine with the Black smoke out the back [slw5] by zoom49 Apr 12, 2009 (4:41 pm)
Replying to: slw5 (Apr 01, 2009 7:34 am) Hey slw5,   Good to see you are still around. I am the other owner you were referring to. It seems this issue only affects the 2007 model year using California's lower 91 octane fuel. The service bulletin has the dealer replace the Variable Valve Timing actuator and install a new ECU form a 2008 model. In 2008 Mazda changed the ECU to enable the engine to use lower octane fuel. I had always used premium but here in Cali it was only 91 octane. Our car no longer has this issue and is running great. The problem is getting the dealer to acknowledge the issue. Replies to this message: slw5 (Apr 12, 2009 6:55 pm)
#40 of 41 Re: Fix for the CX7 Clanging Noise in Engine with the Black smoke out the back [zoom49] by slw5 Apr 12, 2009 (6:55 pm)
Replying to: zoom49 (Apr 12, 2009 4:41 pm) Good to see you as well!   I am so thankful they were able to verify my issue and yours. I would have sat there till hell froze over before they actually would have done anything with my name at the top of the list for the specialist. McGee did a great job on my behalf and my car is like a completely different car. I love it now!!!   Our tech guy at work is a Mazda enthusiast & he drove it probably the way it was meant to be driven using the gears and all and came back smiling!!! Of course, he told me the reason I don't get good gas mileage is because I'm a lead foot, but how could I be anything other than that driving a CX-7?!?!?!
#41 of 41 Re: Temper [slw5] by sdbobo619 Apr 21, 2009 (8:03 pm)
Replying to: slw5 (Feb 19, 2008 6:19 pm) I have had a weird white smoke when idling the vehicle cold, has only happened about 3 times in the 2 years I have owned the vehicle....   Never had black smoke and dont notice turbo lag....

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