Pinging noise on cx5 diesel

[Dr_Watson]

Another thread on the DE forum, I put a post with a link to here, keep an eye on it, maybe there is some useful info we can share to get to the bottom of it. Posted in English for now, can post in German when I have time tomorrow.

http://www.cx5-forum.de/f11/motorgeraeusch-beim-fl-175-ps-diesel-5024.html

 

[iKing]

For the record, I talked to my dealers workshop chief about this and they will investigate when I take the car to them for other servicing in the near future. They have not had this type of complaint before. I also sent a link to this thread and the German thread to them for information according to their request. I asked the specifically about "injector calibration". They are familiar with that process but, as said before, not in the context of the subject of this discussion thread. I will of course report on amny findings or results here when known.

 

[Markvg]

I recall a similar noise on first picking my new vehicle up, it wasn't something i recalled hearing when test driving the demo vehicles. The noise though stopped and only occasionally comes back on now and then. I read somewhere that injection calibration learning takes place numerous times within the first 10,000 kms and thereafter every 10,000 k kms. This calibration process also only occurs when the engine is warm (hence you may not hear this when the engine is cold). The i-stop funtion will also not operate when the calibration takes place, similar to the i-stop not working when an active DPF regen is taking place. Hope this helps.

 

[ghb]

My own theory about the pinging noise on the Mazda bi-turbo diesel engines is the mechanism that makes the transition between the small turbo at low revs to the larger turbo at higher revs. To my ears the noise sounds like a butterfly valve tinkling ?

 

[Markvg]

My own theory about the pinging noise on the Mazda bi-turbo diesel engines is the mechanism that makes the transition between the small turbo at low revs to the larger turbo at higher revs. To my ears the noise sounds like a butterfly valve tinkling ?

If that were the case, then there would be no pining noise at idle, as the wastegates are not in transition.

 

[Dr_Watson]

Correct, the noise is present at all revs, at low revs and idle, the engine itself is so quiet that it's practically the only noise you hear.

 

[Markvg]

Can someone post the noise in an uploaded video, to this thread?

 

[ghb]

Hi the light metallic tinkle noise I hear when I press the accelerator disappears the very instant I lift my foot off the accelerator and I can not hear noise at idle ? Is this noise only on diesels with automatic transmission like mine ?

 

[Dr_Watson]

Ggh, this isn't the pinging noise we are having, your noise sounds like a typical noise for a diesel, but it's hard to say from your description.

The pinging noise is high pitched, it starts about 20mins after engine start once the engine is warm and you hear it at the same volume regardless of throttle position. I will try and record the noise sometime in the next couple days. Teething child, wife with a cold...broken washing machine, car is low priority just now.

 

[iKing]

Just a thought on the issue here (I am not a mechanic or engineer). I have been reading here and there and understood that the Cetane value of the diesel fuel can affect the timing of the ignition or burn of the fuel and therefore on the resulting noise too. Got the information that the fuel I am using has the Cetane rating 51-53. The fuel sold here is according to "EN 590" which has a minimum demand of Cetane 51. Any comments on this?

 

[iKing]

DR_Watson and others. Here is a short clip that I made with an iPhone in an attempt to record the pinging/tinkling sound. It is not very clear in the recording but I can hear it because I know what I am looking for. I was driving slowly and the pinging can be best detected when releasing the throttle. Can you hear it?

 

[Dr_Watson]

Can just hear it, but only because I made a recording, listened to it and thought it was not clear enough, but it does sound the same as yours to the trained ear. Phones or cameras don't really pick it up very well as I expected.

It is also loudest when coming off the throttle in 2nd or 3rd gear. 100% sure it's the same thing.

 

[xtrailman]

I hope my new car isn't going to sound like that, my present one sounds sweet to me, I really enjoy the sporty nosie when I cane the engine, and it goes like the clappers.

DR_Watson and others. Here is a short clip that I made with an iPhone in an attempt to record the pinging/tinkling sound. It is not very clear in the recording but I can hear it because I know what I am looking for. I was driving slowly and the pinging can be best detected when releasing the throttle. Can you hear it?

 

[Dr_Watson]

Fingers crossed for you!

My car is nowhere near as loud as it used to be. Either it has fixed itself, or it takes much longer for the noise to appear than before due to the colder weather. Normally I need to drive a good 20 mins and then I hear it. Yesterday it was still quiet after about 25 mins, temperature was about 5 Deg C which is a big drop from recently. Would prefer if it's fixed itself but I don't drive our CX5 long enough to tell.

 

[iKing]

Fingers crossed for you!

My car is nowhere near as loud as it used to be. Either it has fixed itself, or it takes much longer for the noise to appear than before due to the colder weather. Normally I need to drive a good 20 mins and then I here it. Yesterday it was still quiet after about 25 mins, temperature was about 5 Deg C which is a bog drop from recently. Would prefer if it's fixed itself but I don't drive our CX5 long enough to tell.

I am experiencing something similar with my car. The noise seems to be fading. Also had the same thoughts that it might have something to do with the colder weather. But I have not been able to test this fully because I mostly do short trips too.

 

[iKing]

I hope my new car isn't going to sound like that, my present one sounds sweet to me, I really enjoy the sporty nosie when I cane the engine, and it goes like the clappers.

Good that you do not have the noise problem. It gives me hope that the problem may perhaps be solved with an injector adjustment/calibration.

 

[iKing]

Had the car inspected by the dealer today for a possible cause of the pinging noises. As expected, nothing was found. But as already mentioned, the noise has faded so much that it is barely a cause for a complaint as it stands at present. But the dealer told me it was a good thing to have the problem documented in their database, in case of any further developments in the future. I just hope it stays as it is. As to the so-called injector calibration mentioned earlier in this thread, they told me that the car is designed to calibrate itself automatically and therefore they did not attempt to interfere with that.

I also had another issue checked. The creaking noise in the brakes when moving inches (obviously the same issue as mentioned in the first post of this thread). They checked the brakes and found nothing wrong. Told me that these noises are just normal for this type of brake system. I am not entirely happy with that but not much to do about it. I will try "googling" for remedies for that issue.

 

[Furbz]

has anyone got any further feedback from mazda regarding this issue?

 

[iKing]

has anyone got any further feedback from mazda regarding this issue?

Hi, have not got any further feedback from Mazda, other than already mentioned in my last post. The situation with my own car is still as reported , i.e., the noise has faded and I do not see a reason to complain if it stays as it is at present.

 

[Furbz]

Hi, have not got any further feedback from Mazda, other than already mentioned in my last post. The situation with my own car is still as reported , i.e., the noise has faded and I do not see a reason to complain if it stays as it is at present.

glad to hear your is behaving!

our CX5 has 14000km on the clock and still a brain hammer!