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Cayenne 2009 GTS hesitation on light acceleration

Throttle will recalibrate if needed with ign on .. it won't happen when driving and it it needs to do this find the end stops so i doubt that is an issue ... end stops being it doesn't know full open / full closed .

New coils and it drives better would indicate x1 coil was breaking down .. but is fixed .

The box adjusts to the driver .. so if you stamp on the throttle a few times while driving then it will adapt to a faster gear change .. ie instead of x1 down shift it will do x2 .

What we call granny mode .. the car thinks everything is lazy and slow and so it will perform that way .. boot it a lot / fast stamp on the throttle and it will go into sport mode in essence .

PSM fault will have an impact but on the suspension not the engine .. well to a degree .. it can feel similar though .

Drive it .. boot it and see how it goes then report back i feel .
 
A few weeks now, it now feels like it did before sluggish and jerky on light acceleration, seems to be worse when raining?
will do a smoke test soon to see if there is still a vacuum leak somewhere.
but it runs well when you boot it, smooth reving , slick gear change, sounds great, unfortunately I spend 95% of my driving in the 1000-2000rpm range where the hesitation is, but only on light acceleration once up to speed its very smooth and stable.
one of the aftermarket HID's blew, so had to fit a pair of HID bulbs from a kit someone gave me, but the output was very dim and blue, so fitted some LED Beamthech units , had to order an adaptor, seem good , just as bright as the HID's before, good solid beam pattern, and no ballast hanging out of the back of the light.
but now need to get load resistors to stop the "Check low beam " warning.
you could use these for main beam as there is no switch on delay or surge?
 
In regard to jerkiness, do you think it is definitely the engine being jerky or do you feel it through the car?
I had some jerky/pulsating feeling at 2000rpm which turned out to be having different brand of tyres on the rear. That feeling came back on the weekend and it was due to a tyre being 20 psi..

If it's engine, are any of your plugs oily?
 
the jerkiness is from the engine when accelerating, the whole car judders very briefly, could it be engine mounts ( not the top one) ?

Plugs were all oil free.

it has had the high pressure fuel pump fitted in the past, this could also cause my issues. seems common on the Panamera.
 
Just a wild stab in the dark but possible it's a transfer case issue .. they do give similar faults ..

A garage with experience of these issues needs to drive the car to be honest .. i kinda know what it feels like but obviously i can't drive your car so just a suggestion .
 
You've done the right thing with coils and having clean plugs.. Might be worth doing the transmission fluids as they prob haven't been done but really, it sounds like it could be best to get the car into a specialist otherwise you could just be shooting in the dark with trying to sort the issue..
 
something to keep in mind, I haven't checked the fluid on it yet.
 
In 4 years or so of being here i have never repeated myself ..

Going to now though .. i would like a Porsche mechanic to drive the car and say for certain what you have is not a transfer box issue ..

The more i think about this the more i want this ruled out .

Im probably wrong ... well hopefully as a repair is not cheap but i do need this ruled out .

last comment and sorry for being rude .
 
I don't find your comment rude in the slightest, I have had three Jeeps before and personally replaced the transfer box on one so I understand how the 4WD system works, reading up on the Porsche symptoms the fault will get worse , and is quite pronounced, I am going to book it into an independent at some point , hope fully soon.
 
Just changed the starter motor , it now starts unbelievably quickly .

£165 from Autodoc as apposed to over £900 for the Porsche one and they were virtually identical.

I changed all the inlet manifold seals as well £5 each.

Easy to take out but a real pain to put back, mainly the small vacuum pipe at the back of the manifold, which would come out when trying the install the manifold , impossible to see when the manifold is in position, ended up using sticky backs and tyraping it in place, then feeding the pipes round the back of the loom.
only way to check it on is to suck on the vacuum pipe to make sure its attached.
the small pipe controls the air flaps inside the inlet manifold.

the old seals were quite compressed , but now my hesitation is virtually non existent, and the engine has much more torque, and really pins you in your seat.
the inlet valves were covered in dried oil and soot, I sprayed some carburettor cleaner in there and managed to remove some of it, the disadvantages of direct injection, and crankcase oil scavenging.
 
Good work, strangely, when I was at 9Excellence, I was talking to one of th techs and I asked about the common issues he sees, he mentioned inlet manifold seals getting sucked in. I've never ever ever seen a mention of that before.

Have you got a pic of yours on the 19"s now? I was thinking about 19" for winter.
 
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