Crankcase (pcv) Problems of Mazda CX-7

While driving down the interstate, vehicle lost much of it's acceleration, and began making a loud whining noise. Pulled off the highway and investigated the noise. It was a loud whining that only occurred in neutral and park over 2500 rpm and with any acceleration while in gear. Also noted yellow foamy oil on the dipstick which was 4. 5 quarts low being very close to time to get a change. Towed to the shop to discover that the vehicle is burning oil and the turbo had gone bad. Mechanic suspects that the turbo going bad is what was most likely burning oil and retaining water in the crankcase.

See all problems of the 2009 Mazda CX-7 🔎.

Purchased 2007 Mazda Cx-7 with 65,000 miles. At the time was told it had a new turbo. Had the vehicle 2 months and the erg valve died (technician stated they should last 100k miles) was replaced at my cost of $850. When replacing the erg valve they also noticed a worn tube that will cost an additional $180 at my cost. They also noticed the new turbo was smoking and this was an extended warranty coverage from Mazda to 70k miles (I was at 68,5000). They are adding a whole new pcv vent kit at dealer expense). Now I am hearing a loud ticking noise whenever I turn on the a/c which could be either the vvt timing chain or the air conditioning system. Both are known defects of 2007 Cx-7's and will cost about $1,000 to fix for each issue. The timing chain is covered until 70k miles so I'm trying to get this fixed by the dealership now before I run out of warranty. However, the ac issues were only covered to 60 k miles and I am beyond that coverage so I will have to fix that at my cost. If you do a quick google search you will see extensive documentation of these same issues amongst many Mazda owners. Mazda refuses to recall such parts and only this year (4-5 years later) did they extend warranty coverage on some known defects knowing that most people would be beyond the warranty limit of 60/70k miles. There are many reports of engines seizing due to the ac and timing chain issue. I am quite frankly terrified to drive this car and seeking a very comprehensive extended warranty to hold me over until I can trade it in and get something reliable! I work for a car dealership so I know that these issues are legitimate with this vehicle.

See all problems of the 2007 Mazda CX-7 🔎.

My wife was driving our 2007 Cx-7 with approximately 28k miles along a four lane major road when car lost power and became basically undriveable. Leaving her sitting on a extremely busy section of road with my 2 year old son in the back seat as people are flying off an entrance ramp from aberdeen proving ground. She fought it to the shoulder of us route 40 north of baltimore, leaving her in a very dangerous situation. Mazda dealership where vehicle was purchased was less than a half mile from failure location and after traffic had died down I was able to limp vehicle to dealer with wife following me at 10 mph. Turbocharger failure has been blamed, as usual Mazda has denied warranty work due to engine sludge, even though vehicle has been maintained. After thorough research for the last month, while my vehicle has sat at the dealership, via many websites edmunds forum, mycx7. Com, Mazdas247. Com etc. Mazda is claiming same engine sludge is cause of failure of numerous timing chains, turbos, vvt actuators etc. Even on vehicles that have been maintained by their dealerships. There has been a technical service bulletin released by Mazda (TSB# mtol - 5505) that stated the flawed design of their pcv system not allowing oil to drain properly from the turbocharger. No fix has been made available with recent information I have read in regards to the flawed pcv not circulating the oil. Hope someone can bring this flawed design engine to light before someone or a family is killed in a major accident where their car leaves them stranded in the middle of a highway like I-95. Thanks for the time in looking into this matter.

Mazda cx7 2007- 21,000 mile . Air conditioner seized there by shredding serpentine belt , loss of power steering, alternator. Repaired under warranty. Then 1 week later after about 900 miles the pulley off crankcase (harmonic balance) actually fell off ( found inside wheel well fender). Serpentine belt now not spinning , loss of power steering again and engine over heating again. Second repair in progress now(06-22-09).