Porsche 911UK Forum

Welcome to the @Porsche911UK website. Register a free account today to become a member! Sign up is quick and easy, then you can view, participate in topics and posts across the site that covers all things Porsche.

Already registered and looking to recovery your account, select 'login in' and then the 'forget your password' option.

2011 958 3.0TDI resonating at 1000, 1600-2200 rpm

Andyspencer100

Well-known member
Joined
15 Jan 2016
Messages
101
Hi Guys,

Been away for a bit as I had to sell the 911 to fund this new house, I know my priorities are off big time, anyway, got the minus a 70k miles 958 as above and the engine had to come out for the chain guard oil seal to be replaced. since then (I think) there has been a strange resonating vibration around the above RPM's.

Now I guess it'll be an exhaust rubber or mount, engine mount or gearbox mount but I wonder if anyone has suffered this before and can point me in the direction of a likely culprit based on these symptoms?

If not, I will start the process, find it and post back with a how too, in case it helps someone else. :?
 
Andyspencer100 said:
Been away for a bit as I had to sell the 911 to fund this new house, I know my priorities are off big time...

Not at all... :welcome: back!

:thumb:
 
Hi Andy good to see you back keep us posted on what you find :thumb:
 
thanks guys, it's good to be back!!

I'm actually looking for a 997 C4S with high mileage for the right price, full intending to strip the engine down and rebuild it from scratch in my new workshop (the new house has some advantages) with haertech liners (I'll send that off to them) uprated IMS and new chains etc etc etc. So the milage doesn't bother me at all.

When I find the cayenne issue, and I will, I shall report back with pictures. :thumb: :thumb:
 
Difficult to say what it is but if we relate it to the engine being out then i would be haveing a good look at any pipes from the engine touching the body work or perhaps not in the rubber mounts properly .

power steering pipes perhaps :dont know:
 
every day is a learning curve and all that.. It's in for it's service, and I sent it to an Audi specialist as I figured 2 things. !). it was almost half the price, and 2 it's basically a toureg/Q7 anyway.

So, they have replaced the belt, checked the crank pulley and everything. They have had it 2 days and everything else is ok. So they think it is (and bear with me here, I had no idea a tiptronic had one of these) the DMF..

he said it isn't exactly a DMF but it does a similar job and he thinks I should live whit it until it becomes much worse as its an engine out job again and he thinks its fine for a while yet.

I mean thats very honest of him I think.
 
Im a little confused here .. DMF = Duel Mass Flywheel .. thats on a manual .. Tips have a Torque convertor .

Ive got to admit i cant remember the last Tip box i dropped on one of these but im pretty sure it was a standard Torque convertor fitted.

I think i need to read up a bit on this as atm i dont understand it .. and thats rare !

Front crank pully is dampened though .

You can drop a tip box on these without engine removal .


https://www.deroure.com/diagrams.asp?TBL=4999&MAK=3&MDL=35&SMA=0&SMO=0&ST=&SC=0

Edit ..

All i can think of is hes talking about the convertor lock up clutch and saying its similar to a DMF .. well there would be a fault code in the Tip CU for that .
 
That's definitely what he's talking about if, the torque converter looks like a big bulbous thing that sits between the gearbox and the engine?

Other than that, he's out of options as to what it could be.
 
Yup .. a torque convertor .. its a system of vains that direct fluid with a lock up clutch to give you 1-1 drive .. think of slipping a manual car to pull away .

Normally there will be a fault code if its this .. ie the lock up clutch as the car can see the speed difference between engine and first motion shaft .

i think a fault code check is needed first if not already done ..

Its not a cheap item to replace on a hunch .

Vibration though .. hmm ..

Propshaft center bearing is more likely but im guessing as i cant see the car .. worth checking the prop though.

I would also add the transfer box can cause issues with out fault codes so to be honest this is a little tricky to answer .
 
So, I have done some trial and error fettling and managed to reduce the resonation by at least 60%, in fact the 1000 rpm has completely gone. The 2 x rubber stops for the bonnet were wound down completely and thus the bonnet was rattling at certain frequencies.

So it's just whatever else is loose now to track down. Torque converter I don't think is the issue, and the guys who was trying to explain what it was actually did think it had a DMF.... Turns out he was the apprentice. LOL

Anyhoo, I'm going to track it down and fix it myself!! Will report back
 
This is getting boring now.
I'm going to change the front and rear diff oil as well as the transfer case fluid as at 76k it might as well be done. And I'm hoping this improves things.

Any idea what oil to use? Castrol is what I've used on other cars and in my 997. It seems fairly DIY
 
Im afraid at work i just use the oil they give me so off hand im unsure .. diff oil will probably be 75/90 but the transfer box is a speacial oil .. probably best to phone an opc for a price then ask what oil type it is.

Im afraid i cant see changeing the oils will make any difference to a vibration.

I think if i had tha car in at work i would be useing a chassis ear .. micro phones connected to different places on the car to try and track down this fault .

It still feels to me like a metal pipe or bracket is touching the body work .. this will transfer engine vibration the the body .

Just to confirm .. you have checked the prop center bearing to make sure theres no excessive play .. split basically .

Also i take it you are no where near Brighton ?
 
Hi Mate,

Unfortunately not, I'm in Sheffield.
I'm sure you're right. I just need to get under the car which is difficult at the moment with no access to my garage.

I haven't checked the centre bearing yet either. I promise that's tomorrow's job
 
Andyspencer100 said:
This is getting boring now.
I'm going to change the front and rear diff oil as well as the transfer case fluid as at 76k it might as well be done. And I'm hoping this improves things.

Any idea what oil to use? Castrol is what I've used on other cars and in my 997. It seems fairly DIY

Try this site. It gives you the recommended fluids for front and rear diffs, transfer case and transmission:
https://www.ravenol-direct.uk/which-oil.html
 
That's brilliant thank you!

I've had another poke about under the car and found the rear most belly panel mounting, completely missing. So I've stuck it down to see if that's the cause as it was just rattling against the gearbox mount.

It's omproved it greatly. However, not completely so I do think you are right in that it's something else against the chassis.

Once I can get it on jacks and crawl underneath I'll track it down.
 

New Threads

Forum statistics

Threads
124,354
Messages
1,439,458
Members
48,711
Latest member
Silage
Back
Top