Cayman s Gen2 jumpy throttle
Discussion
Hi
Car is a 2009 early gen 2 Cayman s. Recently, well, over the past months, I've noticed some rough running when on light throttle in traffic, mainly between 2-3k revs. It seems there are three main symptoms.
First, is a hesitation on throttle application. Say, cruising around 2 k revs and you apply circa 10-20% light throttle there is a pause, then it goes.
Second, is an abrupt deceleration or 'hole' in this range when you come off. Best example are hill starts. If I over cook it a little and say come up on the car in front too quick, or it slows unexpectedly for something when im coming off the clutch and I have to lift, the car just stops in reaction to the lift. Sometimes this isn't a full lift either, but I seem to get a 100% back off despite the throttle position. Sometimes I get double bubble of the pause above just after trying to recover from the 'hole' which is a guaranteed stall. Yep, In my 40's and stalling.
Third, is just rough or lumpy or surging running around the cruising point between acceleration and deceleration, you know, just keeping it going. Again, low speed in the 2-3k range.
All of this is light work in traffic or low speed running around a city. Basically I feel like a 16 year old learning to drive again. Get it on the open road, over 50% throttle application or and above 3k or on a hoon and it acts fine.
I'm thinking a possibly dodgy throttle position sensor but have read about mapping issues which give some similar symptoms though most threads seem to indicate this is on WoT. Any thoughts? Car is under porsche warranty so I'll be taking it in anyway, wanted some advice as I find you have to lead the techs to a solution if it's not something they can replicate themselves, or the laptop says no.
Car is a 2009 early gen 2 Cayman s. Recently, well, over the past months, I've noticed some rough running when on light throttle in traffic, mainly between 2-3k revs. It seems there are three main symptoms.
First, is a hesitation on throttle application. Say, cruising around 2 k revs and you apply circa 10-20% light throttle there is a pause, then it goes.
Second, is an abrupt deceleration or 'hole' in this range when you come off. Best example are hill starts. If I over cook it a little and say come up on the car in front too quick, or it slows unexpectedly for something when im coming off the clutch and I have to lift, the car just stops in reaction to the lift. Sometimes this isn't a full lift either, but I seem to get a 100% back off despite the throttle position. Sometimes I get double bubble of the pause above just after trying to recover from the 'hole' which is a guaranteed stall. Yep, In my 40's and stalling.
Third, is just rough or lumpy or surging running around the cruising point between acceleration and deceleration, you know, just keeping it going. Again, low speed in the 2-3k range.
All of this is light work in traffic or low speed running around a city. Basically I feel like a 16 year old learning to drive again. Get it on the open road, over 50% throttle application or and above 3k or on a hoon and it acts fine.
I'm thinking a possibly dodgy throttle position sensor but have read about mapping issues which give some similar symptoms though most threads seem to indicate this is on WoT. Any thoughts? Car is under porsche warranty so I'll be taking it in anyway, wanted some advice as I find you have to lead the techs to a solution if it's not something they can replicate themselves, or the laptop says no.
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