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Mazda CX-7 Engine Problems



  • It is really frustrating to see these emails and they all say the same thing. At the very least, Mazda could send out a notice about the type of oil to use and how often it needs to be changed. But that would be admitting fault, wouldn't it?
    I just got my car back (after 8 weeks and one new engine) and they say every 3,500 miles change the oil and use synthetic oil.
    Guess what, after paying the car down for the next year, it's going on the block to sell!
  • I think your comment is interesting. You are correct to some degree, but let's face it here.... These aren't typical situations for used vehicles. I have always purchased used, and NEVER in my life dealt with a breed of car as Mazda. I just dumped mine, thank God. Mazda should be held responsible for selling crap, just like any of us would be held responsible in our own lives. Your comment about "buyer beware" doesn't have a leg to stand on in this conversation forum.
  • Not to defend Mazda-but why are you attacking wwest? Depending on the price point, the state where purchased, and from whom... used cars are "buyer beware." no warranty for the most part. Assuming that the present owner has taken meticulous care of the Mazda cx-7.... how do you know that previous owner didn't run it low on oil or coolant?--(even once) and for the cx-7-- that is more serious than the average car because of the turbo implications.

    I'know from experience with these cars because I myself am driving a 2007 cx-7 w/ 80,000 miles . Timing chain replaced at 55,000 miles --EGR valve and fuel pump replaced at 70,000 miles. I think all the newer vehicles are failing parts with more frequency due to to manufacturers making the vehicles (and their internal parts) lighter and lighter due to stricter pollution and gas mileage requirements.
  • flig_chrisflig_chris Posts: 1
    edited December 2011
    Another CX-7 Engine Failure. The following was submitted to the NHTSA.

    Dealership maintained CX-7 experienced major failure while driving. Engine died and major oil leak was noticed. Car had to be towed to the dealership. The dealership first indicated that there was some type of failure regarding the #3 cylinder. Dealership said that the probable cause of failure was due to turbo overheating. Later the dealership stated that the #4 piston failed and caused catastrophic damage to the engine. The cause of failure was never determined. The engine, turbocharger, thermostat, EGR valve, intake manifold, starter and O2 sensor were replaced. Total cost of repairs (labor, parts, and misc charges) prior to tax was $10,557.49. Prior to engine failure we informed the dealership that the check engine light was constantly on but the dealership stated that it was due to the gas cap not being properly put on. They never scanned the computer despite the car being under warranty. Additionally a ticking noise has been previously brought to the dealership's attention but was told that the engine noise was normal for this particular engine.
  • Hi, I'm in the market for a CX-7 but all these posts are making me wary of purchasing the vehicle. Has the reliability gotten better over the years since 2007 or pretty much the engine and powertrain has stayed same over the years and I will likely encounter the same problems several years down the line? Thanks in advance.
  • First off,,,we absolutely loved our 2007 CX-7. Had a relatively minor issue with the timing chain and it was repaired under warranty at about 21000 miles. However, I also became concerned after reading this forum and others and soon thereafter, traded in the CX7. It is my understanding that this timing chain issue and others are 2007 problems. Good is a nice car.
  • There was a change in design; they did away with the turbo charger, and now have two options, a 4 Cyl and 6 cyl.
    However, I would stay away; look at all the posts here. Many people had the timing chain snap and ruin the engine within the 60k miles warranty period, but Mazda has refused to cover it, with the excuse that since customer could not come up with all the oil change receipts, it happened due to poor maintenance.
    I took my car for oil change and maintenance to a Mazda dealer every single time, but in my case the chain snapped at 64k miles.
    Even if I paid for replacement of the engine, warranty on "new" engine would only be 12 months 1200 miles, and a mechanic told me it was likely that it could happen again.
    I sold the broken Mazda CX7 for a few thousand dollars, and bought a Toyota Prius; yeah, sacrificed a bit on space, but now it runs for 2 weeks on $27. When I had the Mazda I was putting $60 every week.
    I will never buy Mazda again, just because of the failed design, not accepting that it was a bad design, and the warranty issues.
  • wwestwwest Posts: 10,706
    The only way I would purchase a CX-7, new or otherwise, is if I had the money and planned to do a few modifications. First would be to "wire" the turbo wastegate WIDE OPEN. Should I subsequently decide I needed the boost performance level I would either:

    1. Look widely for a water cooled turbo, with "after-run" coolant pump, to install inplace of the OEM one.

    2. The other possibility would be to mill the head, leaving the turbo inop, to get the "standard" DFI compression ratio of 12:1.

    On the other hand if FE improvement were the desire I would convert the engine to the Atkinson cycle. Mill the head to get a 15:1 compression ratio and then block the throttle plate opening enough to restrict the maximum cylinder fill to ~70%

    Has anyone ever tried using the A/C to cool the boost charge? A refrigernat accummulator/reservoir dedicated to that task and only opened to flow when on-boost. Might be able to keep the 15:1 CR AND have boost.

    Oh, sorry, senior moment, forgot that an Atkinsonied engine hasn't enough energy in the exhaust to spin a turbine. SuperCharger?
  • wwestwwest Posts: 10,706
    The non-turbo 4 cylinder isn't available with F/awd.
  • dj119dj119 Posts: 10
    Do not ever buy a Mazda of any kind. Their customer service and employee people skills are the worst of any king of retailer of goods I have ever experienced. They will admit that they had a flaw in the CX7 and thus many customers got stuck with huge bills and a worthless car. Me for one. I am still buying off the $6800. extra I had to borrow to have a car still under warranty fixed. Trust me, I sold it the say I got it fixed. Stay away from Mazda cars. They are big time trouble.
  • wwestwwest Posts: 10,706
    Given the design engineer, engineering, sharing alliance between Ford and Mazda one has to wonder what the reliability might be for the upcoming EcoBoost 4 cylinder to power the new F/awd Explorer. Oh, sorry, like the non-turbo 4 cylinder CX-7 the 4 cylinder EcoBoost Explorer does not have the F/awd option.

    Maybe that's the Ford/Mazda answer, less overall "stress", no F/awd capability, on the Explorer's turbo 4 cylinder drive train to "improve" the reliability.
  • ckbolesckboles Posts: 16
    Guess I've joined the club.....engine shot at 72,000 miles, extended warranty will not cover due to "lack of maintanence" even with receipts. Since purchasing gently used in 2008, 3 sets of tires, no power, needed turbo sensor, clicking noise, sparks coming out of steering column, bad / foggy headlights, windshield seal causing major passenger side leakage, sludge and metal in the engine, whirring noise lasting for 3 minutes after shut-off. About $10,0000 to fix replace engine.

    Question: Should the dealer / warranty company have noticed the timing change issue when they replaced the turbo sensor? I have documentation stating it was bad from an independent, reliable mechanic, Mazda dealer did the warranty work to replace turbo, but said nothing about the timing chain and / or sludge. Also: is it reasonable that sludge would have been found in engine when the turbo sensor was replaced?
  • ckbolesckboles Posts: 16
    Who paid for the repairs? You or the warranty company? Same exact problems, don't think it makes sense to fix this car if it's not covered by the extended warranty, in dispute now.

    Reported to NHTSA also.
  • Just had the turbo replaced at 64,850 miles today. Brought the CX-7 in for an oil change and to diagnose a rattle-ling/clunking noise when accelerating on 01/02/12. I have the Mazda Extended Protection Plan (Easy Care) which I had to fight tooth and nail to get them to cover the turbo replacement. After 9-days of proving that my records and the Mazda Shop Foreman's observations were correct on having no signs of neglect MEPP (Easy Care) approved the claim. However, the car rental exceeded the max. 6-day allowance and the diagnoses labor exceeded the 2-hour labor allowance. It took me to contact the CEO of Easy Care to make things right since it was his company that prolonged the process. Will be picking up the car this afternoon to see if issues have been resolved. Cosmetically the CX-7 is appealing but reliability and dependability is awful. Let a lone dealing with MEPP is a huge headache as well.
  • jbolesjboles Posts: 3
    I'm in sort of the same sinking boat- About a year ago, under my long term warranty, the turbocharger was replaced. They mentioned nothing to me about timing belt issues. A few weeks ago, a tapping whining sound, and loss of power. Had it towed to the dealership, John F Kennedy in Conshohocken Pa, and was told engine needs replacement, and it is not covered because there was sludge in the oil pan- I have maintained the cars oil changes, and told the mechanic last year when the turbo was down that I was constantly adding a quart here and a quart there, because of the oil light. Nothing was done to address that, and now they want $9000 to replace the engine in a 5 year old car-

    Does anyone have any advice on how to best approach This? We have been on the phone many times with the dealer, Mazda, and the factory rep, and they are not moving an inch-

  • nicho1nicho1 Posts: 1
    i am about to have the same problem. did you have any luck with them helping for costs?
  • My daughter's CX-7 was diagnosed with these problems and Mazda factory told her the same things, engine needs to be replaced, 8K cost.
    I knew the turbo was burned up, bought a replacement, with the assistance for tech info from Blast Performance in Quebec, we changed the turbo, installed a re-routed oil supply line and the car now lives again.
    It can be done alot cheaper, and easier. total cost about $1500 parts and labor, I did some of the engineering.
    If you are in the upstate NY area and/or want to contact me I can give you the info to save you the headache and money.
    My wife and I bought out her mortgage on the CX-7 because she didn't have the money to fix it, and gave her our TDI.
  • Note* These problems are not about changing the oil at the correct interval, they are from heat at the time of shut-down "coking" the oil in the turbo housing!
    The best thing you can do to alleviate this is to let the engine idle for up to three to four minutes when you pull in to park, you can do this by sitting in the car or by installing a "turbo timer", all the tech kids racing and tuning these do it to extend the life of their equipment.
    You also must use the best synthetic oil you can find, Valvoline, Red Line, Amsoil are some of the best, 5 or 10W-40.
    My problem with Mazda is the lying and selling high tech cars and not informing the purchasers of the need for specialized handling for their equipment.
  • ckbolesckboles Posts: 16
    The more I look into the CX-7 engine problem, the more questions I have.
    When my turbo sensor was replaced at 62,000 miles by an extended warranty company, would the timing chain / oil sludge issue be obvious?
    I received a diagnosis of complete engine failure just 7 months after the turbo sensor was replaced, however, I feel like the warranty company may have just done a cheap fix last year, instead of replacing the engine.
    Of course, the extended warranty company won't replace my engine now...citing "sludge", nor will they release the photos or report from their adjustor.
    Fighting everything now. I'm amazed by the "it's not my problem now" attitude of the extended warranty company. My car was well maintained and everything documented.
  • I had the same problem with the timing chain, VVT actuator. We bought the replacement parts from Mazda and my husband is doing the work, but we are still having problems with this vehicle. Today, I got a letter from Mazda that says they know they have a problem and will extend the warrenty to 70,000 miles. Mine didn't break until 80,000 miles so I am screwed by Mazda yet again.
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