Last post on Nov 14, 2013 at 2:25 PM
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Mazda CX-9, SUV
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#82 of 547 Mazda CX-9: Engine Knock
Feb 17, 2009 (6:10 am)
I've experienced fairly significant (and audible) engine knock in our 2008 GT CX-9. It happens when going up a hill in the morning, as well as when trying to accelerate when in a lower gear.
This is a change in performance by our CX-9 as we did not notice this engine knock for the first few months we have owned the vehicle. Furthermore, we have two other vehicles that have no problems making up the hill with no engine knock -- both with over 100,000 miles on them. Last, we live in the South and our CX-9 is garage kept, so we have very little issue with the cold.
I dropped it off at my dealership yesterday, and I was told the same problem was reported by another 2008 CX-9 owner and that Mazda told the dealership to have all customers use premium gas. This is in conflict with information in the owner's manual.
Anyone else with similar problems? Our car has roughly 9000 miles on it and was purchased in June 2008.
Thanks to those that posted the TSB thread. I reviewed it, and it appears the engine knock has not been acknowledged. I did notice the recent loss of power TSB, which I found interesting.
Any and all help appreciated. I suspect we are not an isolated case. I will post an update once we get the CX-9 back from the service department of our dealership regarding the prognosis.
#83 of 547 Re: Mazda CX-9: Engine Knock [gahogs]
Feb 17, 2009 (8:44 am)
Dealer called back.
I was told the knock we heard was brake booster connects rattling and there has been a release by Mazda on this particular problem. The repair was made. We will pick up the vehicle later today. Hopefully this fixes the problem.
Also, he apologized for the premium gas requirement comment. Evidently he is a new employee and not as familiar with the CX-9. He said a particular model on the CX-7 requires premium gas, and he confused the issue.
#84 of 547 Re: CX 9 Uncontrollable in Snow [cx9er]
Feb 17, 2009 (10:09 am)
After testing several SUV's, CX-9 Touring and GT came out to be on the top. But the reported poor snow performance concerns me since I live in the northeast. Is this an issue related to tires or to the design / engineering of the vehicle? Doesn't anyone know if the 09 models have addressed this issue?
#85 of 547 Re: CX 9 Uncontrollable in Snow [ewsnc]
Feb 17, 2009 (10:38 pm)
It is the tires, I can assure you.
The Mazda's Active Torque-split AWD is better than Highlander/Pilot. It senses torque sudden change and starts to transfer torque to the rear. In contrast, Highlander/Pilot sense torque loss then starts to send torque. In the case of Pilot, it can send torque to the rear in case of hard acceleration (and maybe new Highlander as well, I am not sure). Mazda has that also.
It is called Power-take-off mode....
Bridgestone Dueler H/L 400 is good summer/wet tire, but not good at all on snow. Calling it all-season is a "crime", in my opinion.
If you have concerns, have the dealer change out the tires
Yoko Parada Spec-X
Check tirerack.com for review.
#87 of 547 Re: Mazda CX-9: Engine Knock [gahogs]
Feb 22, 2009 (11:32 am)
Follow-up to ENGINE KNOCK (replying to my post on 17 Feb).
We did receive the vehicle back; however, the problem was not fixed. The engine knock is the same as always. The vehicle only has 9,000 miles on it.
As for the noise, it is not a rattling or clanging noise as one may suspect when first hearing the problem may be a brake booster connect. I was suspicious when they said it was a simple brake booster connect problem; however, I did want to give them an opportunity to correct the reported problem. The noise is distinctly engine knock coming from the cylinders (further supported by you only hearing it when accelerating). Again, the same dealership reported another CX-9 was turned in the previous week with the same complaint. I do not expect these would be isolated cases. Engine knock is not good news and can prematurely wear in engine.
We live in a fairly hilly terrain, and the car will exhibit the engine knock going up a hill (particularly when the engine is cold). It will also experience engine knock when you attempt to accelerate in too low of a gear (i.e. transmission is in "5" when it feels like it should be in "4" or even "3"). Again, we have two other vehicles, neither of which has any problem with engine knock regardless if the vehicle is cold or not. Ironically, both of these vehicles have over 100,000 miles on them each (one V6 automatic; the other a 4 cylinder automatic).
Anyone else notice a similar problem?
I will take it back to the dealership to be looked at again.
#88 of 547 Re: CX 9 Uncontrollable in Snow [ewsnc]
Feb 22, 2009 (6:27 pm)
We live in Pittsburgh and have had no issues driving in the snow with our 2008 GT. My wife is the main driver, and she feels confident driving it in snow, much more so than her previous car (which was FWD).
I find that the tires are okay, they are probably tuned for performance and thus you give up a bit of winter grip. But we haven't had any issues going up and down the myriad of hills that is Pittsburgh! The AWD system works just as well as the one I had in my Audi, and gets the car moving quickly. The stability control works well in preventing fishtailing in the snow. In comparison, my Mazdaspeed 3 slides all over the place, but this is mostly due to torque steer! The CX-9 is much more stable than the 3.....ah well.
#89 of 547 Re: Mazda CX-9: Engine Knock [gahogs]
Feb 23, 2009 (8:47 am)
Have you tried filling up with premium gas, 92+ octane to see if the knock noise you hear is reduced? If it's truly knocking, then higher octane fuel should reduce/eliminate it. I'm not saying this is the solution, but it may help you pinpoint the problem more.
#90 of 547 Interior noise
Feb 23, 2009 (12:44 pm)
Every time I ride on a rough road - there is a crackling noise coming from the drivers side passanger in the vicinity of the post where the air bag is located. Has anyone had this experience
#91 of 547 Re: Interior noise [eroc2]
Feb 24, 2009 (3:28 am)
I've experienced what I'll call a rattle from the passenger seat area, when there is no passenger in the seat. I found that the metel seat belt clip (the male clip on the belt) was vibrating -rattling against the side of the passenger seat. To further pin point if this was the source, I engaged the seat belt. The rattle stopped. I have not detected any other rattles from this area since, but I've only had the CX9 for a few weeks. I'm still listening and learning all of it's quirks. Another writer spoke of the sloshing sound of the gas in the fuel tank. I've also expericed this sound. For what it's worth, I find issues like these to be minor inconveniences. The CX9 is a fantastic SUV and great value for the features and performance it offers!