Over-revving (first post)
10-14-2004, 03:58 PM
#1
3rd Gear
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Over-revving (first post)
Hi,
I've recently bought my first Porsche (1996 993 C4, and one very happy new owner) and have just joined the site. I had a look in the Search engine but couldn't find an exact match to my question -
Ocassionally (around 2 or three times on a half day trip) my 993 over-revs when it should be idling - usually to around 3000 rpm. On the motorway I generally dont notice this (except during a gear change) but it becomes a problem pulling into town and trying to idle at lights, behind slow traffic, etc. It seems to happen when the engine has warmed up.
The only solution I have found is to pull over and turn the engine off. When I turn it over again it idles perfectly. My Porsche garage loosened the accelerator cable but that didn't help.
Any thoughts greatly appreciated.
Thanks,
Stu
I've recently bought my first Porsche (1996 993 C4, and one very happy new owner) and have just joined the site. I had a look in the Search engine but couldn't find an exact match to my question -
Ocassionally (around 2 or three times on a half day trip) my 993 over-revs when it should be idling - usually to around 3000 rpm. On the motorway I generally dont notice this (except during a gear change) but it becomes a problem pulling into town and trying to idle at lights, behind slow traffic, etc. It seems to happen when the engine has warmed up.
The only solution I have found is to pull over and turn the engine off. When I turn it over again it idles perfectly. My Porsche garage loosened the accelerator cable but that didn't help.
Any thoughts greatly appreciated.
Thanks,
Stu
10-14-2004, 04:57 PM
#3
Rennlist Member
Clean out idle stabilizer valve (ISV).
10-14-2004, 05:01 PM
#4
Banned
Hi Stu,
First - Welcome to Rennlist!!!
Do a SEARCH for "cleaning the ISV".. If it's "sticking", it will have a similiar problem you describe. Usually - on a restart - it will "unstick it" and all seems normal until it's decided it wants to "stick" again....
Since it's an easy task, it may be a great place to start..???
Hope this helps!
First - Welcome to Rennlist!!!
Do a SEARCH for "cleaning the ISV".. If it's "sticking", it will have a similiar problem you describe. Usually - on a restart - it will "unstick it" and all seems normal until it's decided it wants to "stick" again....
Since it's an easy task, it may be a great place to start..???
Hope this helps!
10-14-2004, 05:02 PM
#5
Banned
Originally Posted by Terry Adams
Clean out idle stabilizer valve (ISV).
)John
10-14-2004, 05:07 PM
#6
Rennlist Member
I don't type faster than John D, I just don't have a day job or a night job, much less both.
I might add that, when I once had your problem, I "cleaned" my ISV with a bottle of Techron and an Italian tune up. I am just lazy.
I have never cleaned or replaced the ISV in the whole 115K miles of ownership. It runs like a gem and just passed CA smog with flying colors.
I might add that, when I once had your problem, I "cleaned" my ISV with a bottle of Techron and an Italian tune up. I am just lazy.
I have never cleaned or replaced the ISV in the whole 115K miles of ownership. It runs like a gem and just passed CA smog with flying colors.
10-14-2004, 05:14 PM
#7
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10-14-2004, 05:27 PM
#8
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I had that happen once--started right after the car was driven hard for a very short burst after not having been driven hard for a very long time. A little more hard driving and it went away, though, and never came back.
