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Matrixxxx
Newbie


Joined: 13 Sep 2019
Posts: 38
Location: York


PostPosted: Tue Oct 08, 2019 8:38 pm    Post subject: Cayenne 2009 GTS hesitation on light acceleration Reply with quote

Well, to add to my list of problems, after changing the thermostat and a new set of plugs, and fixing the vacuum leak, the hesitation is still there.
But!! If I switch off the "PSM" it runs perfect!??, runs as if in sport mode holds the gears longer but no hesitation and pulls a lot more when accelerating,

when you switch it back on the revs drop and it become sluggish and hesitates.

just wonder if it is related to the faulty signal from the front acceleration sensor?
 
  
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Matrixxxx
Newbie


Joined: 13 Sep 2019
Posts: 38
Location: York


PostPosted: Sun Oct 13, 2019 9:26 pm    Post subject: Reply with quote

Now realise that psm keeps the revs above 2k , the hesitation seems to be below 2k rpm.
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Current Cars
2008 Lexus ISF,
2009 Cayenne GTS
 
  
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CarraraWhite
Barcelona


Joined: 06 Apr 2008
Posts: 1291
Location: England

2011 Porsche 991 Carrera

PostPosted: Mon Oct 14, 2019 11:14 am    Post subject: Reply with quote

What garage are you using ?

did they plug in the diagnostics machine
_________________
991Turbo, dont need the S
 
  
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crash7
Hockenheim


Joined: 28 May 2011
Posts: 655



PostPosted: Mon Oct 14, 2019 11:20 am    Post subject: Reply with quote

When were the coils last changed?

Are you getting a CEL?
 
  
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Billy Bumpsteer
Silverstone


Joined: 12 Aug 2019
Posts: 102



PostPosted: Mon Oct 14, 2019 12:37 pm    Post subject: Reply with quote

Coil packs would be my guess
 
  
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Matrixxxx
Newbie


Joined: 13 Sep 2019
Posts: 38
Location: York


PostPosted: Mon Oct 14, 2019 12:40 pm    Post subject: Reply with quote

I bought an icarsoft scanner, just put a new acceleration sensor in, still hesitating, I do all my own work.
Im sure the coils have been changed at some point, it is looking like they may need changing.
 
  
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crash7
Hockenheim


Joined: 28 May 2011
Posts: 655



PostPosted: Mon Oct 14, 2019 1:37 pm    Post subject: Reply with quote

I had a similar problem on my 58 GTS.

Intermittent hesitation under light throttle, no CEL.

I lived with it and eventually the car through up a CEL, which would reset everytime you turned the car off and not come up every journey, I carried my scanner in the car and eventually caught it, codes indicated a coil fault on cylinder 2.

Changed the coil(s), problem solved.

Good luck.
 
  
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Matrixxxx
Newbie


Joined: 13 Sep 2019
Posts: 38
Location: York


PostPosted: Mon Oct 14, 2019 2:03 pm    Post subject: Reply with quote

Did the bad coil look ok? I didn't see any cracks when changing the plugs, I would assume that they all are not failing. May buy one and swap it around.
 
  
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crash7
Hockenheim


Joined: 28 May 2011
Posts: 655



PostPosted: Mon Oct 14, 2019 2:28 pm    Post subject: Reply with quote

No, no visible signs of any wear or damage.

I only had a fault with one, but given they were all the same age and original to the car I replaced them all as a matter of course, however as you say it may not be necessary.
 
  
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Billy Bumpsteer
Silverstone


Joined: 12 Aug 2019
Posts: 102



PostPosted: Mon Oct 14, 2019 2:47 pm    Post subject: Reply with quote

A Durametric will certainly pick up the faults even if it hasnt thrown a full CEL, I take it the icarsoft didnt show up anything?
 
  
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Matrixxxx
Newbie


Joined: 13 Sep 2019
Posts: 38
Location: York


PostPosted: Mon Oct 14, 2019 3:42 pm    Post subject: Reply with quote

It hasn't thrown any faults, but can see a lot of variables, I guess it should be possible to see something not running as the rest. How long do they normally last?
 
  
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Billy Bumpsteer
Silverstone


Joined: 12 Aug 2019
Posts: 102



PostPosted: Mon Oct 14, 2019 3:55 pm    Post subject: Reply with quote

They can last 10 years or 6 months. I changed all mine and 6 months later the exact symptoms you have showed again, Durametric showed cylinder 5 missing, just changed that one that time and all ok 12 months on, get it plugged into a decent machine and it will tell you the cylinder/cylinders missing
 
  
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Matrixxxx
Newbie


Joined: 13 Sep 2019
Posts: 38
Location: York


PostPosted: Tue Oct 15, 2019 10:58 am    Post subject: Reply with quote

ordered a full set.
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Current Cars
2008 Lexus ISF,
2009 Cayenne GTS
 
  
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Matrixxxx
Newbie


Joined: 13 Sep 2019
Posts: 38
Location: York


PostPosted: Tue Oct 15, 2019 11:26 am    Post subject: Reply with quote

Old and new sensor
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Current Cars
2008 Lexus ISF,
2009 Cayenne GTS
 



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