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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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#34 of 41 Re: Fix for the CX7 Clanging Noise in Engine with the Black smoke out the back [slw5] by wc524 Sep 26, 2008 (11:24 am)
Replying to: slw5 (Mar 30, 2008 11:37 am) Slw5,   I'm having the same problem less the black smoke, but then again I never paid attention to the back of my car. It's always upon acceleration and from the same spot. Same deal as yours, bought the car back in '06 so it's one of the first, took it in for the PCM reflash back in 07. Taken it to the dealership before and car is sitting there as we speak. They've tried to re-produce the problem and of course it won't do it when they drive it or when I go on the test drives with them. Anyhow was hoping you could provide some insight on how the tech was able to re-produce the clanking noise or better yet provide the contact for the dealership who dealt with the issue so I can refer my dealership to call them to avoid having to go through the same ordeal you did.   Thanks! Replies to this message: slw5 (Apr 01, 2009 7:34 am) zoom49 (Apr 12, 2009 4:41 pm) slw5 (Apr 12, 2009 6:55 pm)
#35 of 41 Mazda CX-7 Rattling or Clanking Noise by just1mnbound Mar 31, 2009 (8:48 am)
The rattling noise started for me about a month and a half ago. My CX-7 is at the shop this morning to find out why. I couldn't find the "why" it is happening on here from other user posts. I'll post how Mazda fixed it once I get my car back. Replies to this message: slw5 (Apr 01, 2009 7:39 am) wc524 (Apr 08, 2009 4:56 pm)
#36 of 41 Re: Fix for the CX7 Clanging Noise in Engine with the Black smoke out the back [wc524] by slw5 Apr 01, 2009 (7:34 am)
Replying to: wc524 (Sep 26, 2008 11:24 am) My dealership could not produce the issue either each time I took it in till the last time when I drove for them and they witnessed it. I had been speaking to someone else on this form who wouldn't get it reproduced/verified either. He contacted the attorney I used and since there is a Service Bulletin now his dealership still wanted to verify it or they wouldn't do the work. My attorney suggested that he go to another Mazda dealership and tell them he wanted a new service dealership and to explain what was happening with the vehicle and that dealership performed the fix for him.   My suggestion would be for you to drive it for your dealership; however, if your CX7 is like mine I had the worst trouble causing it to shudder but it did it all the time when I least expected it. I was just lucky to go in totally pissed at the end of the day and my technician road with me and it did it again. The corporate technician couldn't make it do it but my tech guy got in the car and did what he saw me do and it did it otherwise I would still be here complaining.   My car runs great now with no shudder/clanging noise. I have no black smoke now unless I stomp on the gas but there is no noise at all. I am a very happy camper now. Good luck in your effort to get it fixed.   The Service Bulletin is: ENGINE PINGING AND/OR LACK OF POWER UNDER ACCELERATION #01-041/08. Replies to this message: zoom49 (Apr 12, 2009 4:41 pm) slw5 (Apr 12, 2009 6:55 pm)
#37 of 41 Re: Mazda CX-7 Rattling or Clanking Noise [just1mnbound] by slw5 Apr 01, 2009 (7:39 am)
Replying to: just1mnbound (Mar 31, 2009 8:48 am) suggest Service bulletin #01-041/08 ENGINE PINGING AND/OR LACK OF POWER UNDER ACCELERATION   Replacing the PCM and variable Valve Timing Actuator etc. has made my car like a brand new one. Love it now!! Replies to this message: wc524 (Apr 08, 2009 4:56 pm)
#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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