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SUVs Mazda CX-7 C-7 Clanging Noise and black smoke out exhaust when accelerating
41 messages, Last post on Apr 21, 2009 at 8:03 PM
You are in the Mazda CX-7 Forum. Your Hosts are steve_ & tidester
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Replying to: gch523 (Jan 27, 2008 5:22 pm) How fast are you going on the freeway? Seriously! You must be going 85-90.
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Replying to: cx7lover (Jan 31, 2008 3:51 am) I was driving down a very low grade hill, had to put my brakes on because someone pulled out into my lane, I stepped on the gas to maneuver around the vehicle and . . . .turbo lag to the max and then that darned clanging/smoke thing happened. I stormed into Mazda again and finally the serviceman drove with me and witnessed it when I was driving about 45 mpg and gave it a tad more gas and . .. . metal clanging noise and black smoke out the back. He told me it was definitely not predetonation ping (gas ping) and he didn't know what it was so he was "redlining my vehicle" and contacting Mazda try to find a fix for it. . . . that was October. The serviceman was able to duplicate the problem the next day (thank heavens). Something is definitely wrong with it and I am now pursuing the lemon law.  I've complained about the really strong turbo lag and this issue since the first month we got the car and all I ever heard was that it was normal or we can't duplicate the problem. . . come in when it does it. |
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Replying to: vbbuilt (Jan 23, 2008 2:30 am) Just thought I would keep you posted on the lemon law for my CX7. I did contact an attorney and they asked Mazda to repurchase the vehicle, pay my prorated registration and take off $2K for my mileage. Mazda's response is that they will NOT repurchase the car but will send a specialist out with the "fix" for the clanging/black smoke problem but insist that the turbo lag is normal. I am now faced with 2 choices and don't which way to go. My husband feels that their tinkering with the turbo to improve the lag is what may have ultimately caused the clanging/black smoke and that their fix may be to return the car to the default settings which will alleviate the clanging/smoke but make the turbo lag worse as it was in the beginning. I've been instructed not to drive the car so sharing and driving my husband's Tundra Double-cab remiinds me why I got rid of my Sequoia in the first place . . . . to drive a smaller car. Anyway, here are my 2 choices: #1. I can accept Mazda's offer to fix the problem (not the turbo), accept some money for my trouble as well as an extended 5 yr, 100,000 mile warranty. #2. I can go through litigation which will take months. I'm sure that the longer this plays out the more money the attorney makes off Mazda as they have to pay the attorney fees. It costs us nothing. Don't know if it's better to let them fix it and then turn around and sell it. I'll keep you posted on our decision.
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Replying to: slw5 (Feb 15, 2008 4:29 pm) I too have had the occasional noise and black smoke issue, mine happens only every other week on average. It does not seem related to fuel as I always use top tier (91 Cal) gas and if I let off the throttle and accelerate again I cannot reduplicate the issue. We do not have, nor never have had the issue with turbo lag. The swirl valve on ours was replaceed under recall, for our early 2007. It also happens in cool 60 degree as well as hot weather. Dealer has never been able to duplicate the problem, and neither can we as it happens so infrequently. Please let me know if Mazda finds out an answer. We love our CX-7 except for this occasional hickup. Zoom49
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Replying to: zoom49 (Feb 16, 2008 10:46 am) Mine doesn't do it all the time either. There is no rhyme nor reason to it. The last time it did it, was able to duplicate it for the technician and he was able to duplicate it the next day I had just filled the tank with Techron Premium (I only use premium.) Was the type gas a factor, who knows!?! I think the CX7 is the greatest looking car on the market and it is totally fun to drive when it's behaving . . . . but in those instances where the margin of safety is compromised by the lag we hate it. This is the first car we purchased without me researching it to death so we had no clue about turbo lag and that it's normal and, of course, it was never mentioned during the sale. We are really in a quandry what to do. I'm afraid to make the wrong decision. Another thought is to just accept the deal with the money for my trouble and then turn around and sell it but that is such a losing proposition. |
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Hi, I bought my wife a 2007 CX-7 brand new in 2006, Yesterday 17 Feb 2008 I was driving her car and I noticed black and white smoke from the exhaust and heard a chain like noise like the noise a bicycle makes when you change gears. The car has about 12K miles on it and this is the first time we noticed the noise and smoke, since my wife drives pretty much in the dark. I took it to the dealer we bought it from and they first said they, could not find any problems except a few computer updates to the engine. I wasn't happy happy with the assessment, so they let it idol for a while and then saw and heard the problem. So now they are going to replace the Turbo. But they say it is safe to drive as is and when the parts come in they will fix it. We'll see. If anyone has a "fix" for their CX-7 Please let me know.
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Replying to: vbbuilt (Jan 22, 2008 6:56 pm) I wish the mileage would be better, but I hit the 20mpg mark two tankfuls ago. My driving habits would be considered spirited at best. BTW the CX-7 turns about 3100RMS at 119mph, so I do consider that spirited. I have not had a single probem with my car in the 19 months that I have owned it and I have not regretted my purchase especially when I am going through the mountains and pushing it to the limit.
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Replying to: murfbear (Feb 18, 2008 7:52 pm) So, I entered into a lemon law case. . . Mazda has offered to fix it but not sure if they have a fix, will find a fix, will replace the turbo or what. We will find that out tonight. I'll definitely let you know when we find out what the fix is.
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Replying to: rethwilm (Feb 19, 2008 9:09 am) I drive 3.5 miles to work and back so my "Speedy Gonzales" driving only gets me 13 mpg at best. I assumed wrongly that buying a smaller car would get better gas mileage than my Toyota Sequoia. I've never used the manual mode but have been told by numerous people to use that in those emergency situations. Guess I need to just bite the bullet and try it. I haven't driven my CX7 in about 3 weeks as instructed so today was the first day back on the road since I had no other way to get to work. WOW, I forgot how zippy it is (spirited I guess). And, so much more fun driving than my husband's truck.
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