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Press clutch at start up - sometimes not working
- Thread starter seeforez
- Start date
-- 997 -- said:
all you need is 2 female spade connectors and a 10cm length of wire, but as the oracle says failure is rare however can be greatly inconvenient, however carrying fixes for all the possible issues on a 997 could add some weight
just to confirm this thread was about the white CLUTCH PEDAL STARTING MICROSWITCH which senses the clutch pedal position for starting the car....i think it is the red clutch sensor position switch which disengages cruise control ( as per the one GT4 has replaced in his other thread ) and this i assume expkains why i am still alive and had no rpoblems with my CC when the microswitch failed
GT4
Nordschleife
- Joined
- 8 Nov 2008
- Messages
- 30,181
Correct, it was only when I actually came to order one, I noticed the PN in your post did not match.
The clutch (unlike the brake) has two switches.
One to detect immediate movement (ie to disengage CC, this is the same as the brake, so as to light the brake lamps etc)
The other is to detect FULL depression, so as to allow engine starting.
The latter can be "shorted" (bridged) with relative safety, as it then just renders the car as dumb as older cars that did not check you had depreseed the clutch before driving the car into a wall on the starter :grin:
For the record:
Immediate Switch (CC) = circa £10-15
(you can use the same part number as the brake switch, the red shell is just cosmetic)
Full Depression Switch (Start) = circa £20-25
Apologies, I searched your thread to obtain info on replacement part, and assumed it was the same issue.
The clutch (unlike the brake) has two switches.
One to detect immediate movement (ie to disengage CC, this is the same as the brake, so as to light the brake lamps etc)
The other is to detect FULL depression, so as to allow engine starting.
The latter can be "shorted" (bridged) with relative safety, as it then just renders the car as dumb as older cars that did not check you had depreseed the clutch before driving the car into a wall on the starter :grin:
For the record:
Immediate Switch (CC) = circa £10-15
(you can use the same part number as the brake switch, the red shell is just cosmetic)
Full Depression Switch (Start) = circa £20-25
Apologies, I searched your thread to obtain info on replacement part, and assumed it was the same issue.
Frenchmeister
Barcelona
- Joined
- 24 Feb 2014
- Messages
- 1,419
Might be a good idea for my "to do" list and permanently link the ***** out, as previously said if you try to start the car in gear in front of a wall the it's your own daft fault :hand:
GT4
Nordschleife
- Joined
- 8 Nov 2008
- Messages
- 30,181
Just to update:
GSF switch returned for full refund.
The "cheap" copy did not have the same spring "feelers" of OEM and the unit wobbled in the bracket, and there was a noticeable delay in its action where the revs would rise by 500 rpm before CC disabled after clutch action.
I say "cheap", but that was more a reflection of the quality, as ironically, on calling OPC Cambridge parts this am the price was the same to within 20p!
GSF:
Porsche:
In addition, it was only on removing the original it was apparent the switch unit clipped together.
The press tabs more obvious on the red shell over black.
So I popped open with a small screwdriver and noted the grot covering the contacts (a combination if copper swarf/arc products, grease and dirt/dust), so I cleaned off with WD-40 and IPA using an old tooth brush.
Once re-greased with new silicone grease, I stretched the internal spring a bit to increase the "break" force (ie the contact separation) and reassembled.
Popped the unit back in the car and after 40 mins of testing and several dozen CC trials, all is well.
So I have saved the planet (one small switch at a time) :thumbs:
GSF switch returned for full refund.
The "cheap" copy did not have the same spring "feelers" of OEM and the unit wobbled in the bracket, and there was a noticeable delay in its action where the revs would rise by 500 rpm before CC disabled after clutch action.
I say "cheap", but that was more a reflection of the quality, as ironically, on calling OPC Cambridge parts this am the price was the same to within 20p!
GSF:
Porsche:
In addition, it was only on removing the original it was apparent the switch unit clipped together.
The press tabs more obvious on the red shell over black.
So I popped open with a small screwdriver and noted the grot covering the contacts (a combination if copper swarf/arc products, grease and dirt/dust), so I cleaned off with WD-40 and IPA using an old tooth brush.
Once re-greased with new silicone grease, I stretched the internal spring a bit to increase the "break" force (ie the contact separation) and reassembled.
Popped the unit back in the car and after 40 mins of testing and several dozen CC trials, all is well.
So I have saved the planet (one small switch at a time) :thumbs:
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