Engine Clattering - Fuel

Engine, Exhaust, Drivetrain, ECU Issues and Fixes
Giz9
Posts: 716
Joined: Mon Apr 14, 2014 3:00 pm

Re: Engine Clattering - Fuel

Post by Giz9 » Mon Nov 13, 2017 11:26 am

coulsda2 wrote:
Sun Nov 12, 2017 8:01 am
Very interested how this link progresses because I've had the same for about 6 months - or had...
Mine happens when I accelerate very gently and the revs run around 2000rpm. Reminds me of the old fashioned "pinking" noise from my old petrol cars when the timing was too advanced.
Of course, it happens when I'm in the car with my wife and doesn't tend to happen with others. It wasn't all the time - some days seemed worse than others.

I took it in to the Garage and as you could expect...all the way to the garage I couldn't replicate the problem. A mechanic sat in the passenger seat and whilst I could faintly hear the noise it was very backgroundish and the mechanic was not so sure.

Two points you might be interested in....The mechanic thought it would probably be down to ....(now here I apologise because the mechanic spoke German with some English and I speak English but can point in German)....he explained that there is a feedback from the exhaust gas to the ???? as it can run too hot and the feedback cools. He believed that the problem could lie there.

Because I was so frustrated and they had still not heard the problem the next step is for a day drive by the mechanic under normal use while i sit in a loaner.

Since, the temperature has dropped to around 3 to 5 degrees the noise is gone...it may be a temperature related issue?
I certainly think it engine management-related and therefore could come and go at different engine temperatures, different outside air temperatures and possibly different fuel. I am just glad it has gone! Hoping it doesn't come back but maybe it is not a serious problem if it is engine-management related and only occurs under special circumstances. If it was a pure mechanical problem, it wouldn't go away.
Diesel S - Dark Blue/Luxor Beige. http://www.porsche-code.com/PFRFZG58
Deposit 9/4/2014
Locked down 6/3/2015
Built 12/5/2015. Delivered 2/6/2015


coulsda2
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Joined: Sat Jan 02, 2016 9:09 pm

Re: Engine Clattering - Fuel

Post by coulsda2 » Tue Mar 06, 2018 7:13 pm

Mine does it when the weather is warm. It was so bad I was convinced it was mechanical. As soon as the weather changed to cold the noise disappeared, we wait until it returns but already they believe it’s to do with exhaust gas return being faulty


Giz9
Posts: 716
Joined: Mon Apr 14, 2014 3:00 pm

Re: Engine Clattering - Fuel

Post by Giz9 » Wed Mar 07, 2018 10:24 am

coulsda2 wrote:
Tue Mar 06, 2018 7:13 pm
Mine does it when the weather is warm. It was so bad I was convinced it was mechanical. As soon as the weather changed to cold the noise disappeared, we wait until it returns but already they believe it’s to do with exhaust gas return being faulty
Thanks for that. I wondered if it was to do with cold and will see if mine returns when it warms up. Nice to know that they might be able to do something about it too.
Diesel S - Dark Blue/Luxor Beige. http://www.porsche-code.com/PFRFZG58
Deposit 9/4/2014
Locked down 6/3/2015
Built 12/5/2015. Delivered 2/6/2015


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daftpuddin
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Joined: Tue Dec 08, 2015 11:51 am

Re: Engine Clattering - Fuel

Post by daftpuddin » Fri May 04, 2018 5:26 am

Just a quick update. The mild engine 'rattle' noise has completely gone. Just started using branded fuel, not supermarket rubbish.

Occassional fill up with premium fuel such as Ultimate, but any ordinary branded fuel (my nearest is Gulf from a Co-op convenie) seems just as good. Also had first service, don't know if this made much difference, there wasn't a problem by then.

Engine is super smooth now.


mark-yorkshire
Posts: 2419
Joined: Thu Jan 23, 2014 8:34 pm

Re: Engine Clattering - Fuel

Post by mark-yorkshire » Fri May 04, 2018 7:02 am

daftpuddin wrote:
Fri May 04, 2018 5:26 am
Just a quick update. The mild engine 'rattle' noise has completely gone. Just started using branded fuel, not supermarket rubbish.

Occassional fill up with premium fuel such as Ultimate, but any ordinary branded fuel (my nearest is Gulf from a Co-op convenie) seems just as good. Also had first service, don't know if this made much difference, there wasn't a problem by then.

Engine is super smooth now.
I have always used Shell normal diesel for all three of My Macans which have always run quietly. My last Macan at 23000 miles was still as smooth as when new.
2018. Macan SD Volcano Grey
2015 . Macan SD . Agate grey. Sold at 23,000 miles.
2014. Macan SD . Jet black. Sold at 8,000 miles.
2012. 981 Boxster PDK . Agate grey. Sold
2010. 987.2 Cayman PDK. Aqua blue. Sold.


coulsda2
Posts: 47
Joined: Sat Jan 02, 2016 9:09 pm

Re: Engine Clattering - Fuel

Post by coulsda2 » Wed May 30, 2018 6:11 am

Actually my car is to be looked at in a months time - it seems the clattering noise is actually a faulty timing belt tensioner. Seems the hydraulic tensioner doesn’t work so well when the engine oil is hot. My friend had an Audi A6 with the same engine and it had the same fault!
Will let you know how this goes


Giz9
Posts: 716
Joined: Mon Apr 14, 2014 3:00 pm

Re: Engine Clattering - Fuel

Post by Giz9 » Wed May 30, 2018 9:29 am

coulsda2 wrote:
Wed May 30, 2018 6:11 am
Actually my car is to be looked at in a months time - it seems the clattering noise is actually a faulty timing belt tensioner. Seems the hydraulic tensioner doesn’t work so well when the engine oil is hot. My friend had an Audi A6 with the same engine and it had the same fault!
Will let you know how this goes
Thanks. Keep us posted.
Diesel S - Dark Blue/Luxor Beige. http://www.porsche-code.com/PFRFZG58
Deposit 9/4/2014
Locked down 6/3/2015
Built 12/5/2015. Delivered 2/6/2015


esx
Posts: 1
Joined: Wed Jun 06, 2018 12:23 pm

Re: Engine Clattering - Fuel

Post by esx » Wed Jun 06, 2018 2:56 pm

Hi all, glad ;-) to see that other people experienced the problem my Macan shows since almost a year.
Problem: engine clattering (like a tractor) in 1st, 2nd, 3rd and 4rd gear, at around 1800rpm, when applying gentle acceleration.
Cold or warm weather doesn't matter.
Sometimes it goes away, but I've not yet found what triggers it.
I always use the Shell regular Diesel fuel, tried the Shell V Power but without much change.
One clue that I found is the following:
- I drive a lot of short distances, less than 10km.
- I had a Diesel particle filter warning for which I needed to enter the dealer. They regenerated the Diesel particle filter, and told me I got this warning because I drive to short distances.
The fact is now that after this garage regeneration the clattering was gone. Just to appear a few weeks later again.
You can sense when the engine is going into regen, the stationary rpm go to 800, the exhaust makes a more deep noise (I have the sport exhaust), the car blows a lot of heat, even the fan keeps running when the engine is off, and the car has a very specific smell. However, even when going to normal regen (not through the dealer), the clattering doesn't go away.
The second clue is from the previous post about the faulty timing belt tensioner. Mine has already been replaced ones 2 years ago.
And finally I once got the clattering at start-up and it went away after approx 45min drive. But I was never able to simulate that again.
If interested I have a video of the clattering.
2015 Porsche Macan S Diesel (w/ Sport Exhaust)


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