15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHProblems when accelerating
Reported or suspected cause
dirty spark lead
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Discussions that report identifying a cause
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Reported cause
I had the same symptoms a year ago and it turned out to be a dirty spark lead which was replaced free of charge.
Leading evidence: 'dirty spark lead' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'dirty spark lead' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check light' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed
I had the same symptoms a year ago and it turned out to be a dirty spark lead which was replaced free of charge.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
Anyway Optimax have V-Power on the continent with 100RON, I guess we'll be seeing that shortly....although the post '97 cars are designed to run off 98RON, so the extra won't really make a difference, unless the knock management is tuned to make use of it.
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Suggestion
My dealer said that's normal and is the varioram changing setting which is does at this speed.
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Suggestion
Anyway Optimax have V-Power on the continent with 100RON, I guess we'll be seeing that shortly....although the post '97 cars are designed to run off 98RON, so the extra won't really make a difference, unless the knock management is tuned to make use of it.
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Suggestion
Anyway Optimax have V-Power on the continent with 100RON, I guess we'll be seeing that shortly....although the post '97 cars are designed to run off 98RON, so the extra won't really make a difference, unless the knock management is tuned to make use of it.
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15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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Generation: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
The problem...when accelerating hard...foot down to the floor in 3rd & 4th at about 2.5 - 3K revs I get a shudder and what can only be described as something like a turbo lag and then I get pick up...it like there is a shudder a slight delay when I hear the revs going up and then the traction...any ideas on what causes this?
Is it normal?
Is it tyres?
Is it engine?
Is it clutch?gearbox?
Is it cambelt?
I have a 911 3.4 C2.
Thanks for you help...
Is it normal? NO
Is it tyres? UNLIKELY
Is it engine? MOST PROBABLY
Is it clutch?gearbox? POSSIBLY
Is it cambelt? DEFINITELY NOT - THEY DON'T HAVE ONE!
You need to go to someone with diagnostic equipment, as the problem will show in the fault memory of the DME.
Sounds like it could be a sensor (MAF, Oxygen) or maybe a Variocam solenoid. Like I say, a diagnostic tool would show if it is this kind of problem.
Where are you located?
I hope you run on Optimax/BP Supper or indeed the new Tesco 99 octane, yes Tesco now have the highest octane rating, come on Shell pull your fingers out
Is Tesco's 99RON available yet? Anyway Optimax have V-Power on the continent with 100RON, I guess we'll be seeing that shortly....although the post '97 cars are designed to run off 98RON, so the extra won't really make a difference, unless the knock management is tuned to make use of it.
See this thread, I wrote to Shell asking the very question, so don't hold your breath for V-Power:
http://www.porscheclubgbforum.com/m.asp?m=149719&mpage=1&key=
I had the same symptoms a year ago and it turned out to be a dirty spark lead which was replaced free of charge. Does sound like that or air mass filter. Is the engine check light on?
Si
996 C4
No engine lights on...so possibly the Variocam / Spark plug lead
Someone also suggeted that I should chack if the speedo goes up with the revs as this may indicate a slipping clutch...I done this and thats exactly what happens albeit momentarily until the car picks up again.
Just getting used to my first 911, a 2002 Targa - love it.
I too notice a 'juddering' at 2200 rpm; like a flat spot or slight hesitation, which can be felt when accelerating after being on a constant throttle. My dealer said that's normal and is the varioram changing setting which is does at this speed.
Does this sound like your issue? Is the dealer correct in that all 996's do this?
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