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My money would have been on a bad or out-of-adjustment clutch safety switch....but considering the build date and being a Euro vehicle, there should be no clutch safety switch.
Yep, my 9/94 US build has no clutch safety switch.
I guess they started in MY 1996?
The build date on the OP's car is stated as Build date 2/94- My understanding is that the clutch switch was not a feature until the 1997 model year.
Part numbers are listed for a microswitch up to 1996 and a revised part number for 1997 up.
Can the OP verify that he must hold the clutch peddle down for the starter to operate?
If holding the clutch down is not necessary then there is no switch.
Andy
Loren, my '97 has a START relay - gray I think 40 amps - in the fuse/relay box. I chased a no crank issue for two summers. Very intermittent, replaced the clutch/starter interlock switch twice. I would get nothing from the starter exactly like a bad clutch switch. Finally on a whim I replaced that gray starter relay and my car has been fine since.
Just wondering if this could be the OP's problem or does a '94 even have the starter relay?
Curious if you know.
The early 993 ('94) most likely has no starter relay, no diagrams to confirm that - only '95 & later.
Wow
that is some chiming in.
From my recollection it is the DME.
I bought her 24 years ago and it has never been replaced. Desi has lived
in some extreme weather conditions.
California, Hawaii, Oregon and now west Sweden.
She has had everything done in the last few years.
That was needed and perhaps not.
She is spoiled and always starts first time.
All of your ideas are great but not on point
as ....all those parts batteries ect are in tip top shape.
So picking Up a DME on Monday.
will let you all know what’s what.
wish her lunch cheers
Wow
that is some chiming in.
From my recollection it is the DME.
I bought her 24 years ago and it has never been replaced. Desi has lived
in some extreme weather conditions.
California, Hawaii, Oregon and now west Sweden.
She has had everything done in the last few years.
That was needed and perhaps not.
She is spoiled and always starts first time.
All of your ideas are great but not on point
as ....all those parts batteries ect are in tip top shape.
So picking Up a DME on Monday.
will let you all know what’s what.
wish her lunch cheers
A faulty DME relay will not cause a no crank issue as you described in your OP. A faulty DME relay will prevent the cranking engine from starting.
The 40 amp starter relay I mentioned is not the same as a DME relay. But as Loren said and I agree it is not present in a 1994. I remember this when I researched my no crank issue. I assume that in your car there is likely a starter solenoid probably at the starter that my starter relay replaced in a later model. This could be your problem. Others are correct also - no clutch interlock switch in a 1994.
Loren, my '97 has a START relay - gray I think 40 amps - in the fuse/relay box. I chased a no crank issue for two summers. Very intermittent, replaced the clutch/starter interlock switch twice. I would get nothing from the starter exactly like a bad clutch switch. Finally, on a whim, I replaced that gray starter relay and my car has been fine since.
Just wondering if this could be the OP's problem or does a '94 even have the starter relay?
Curious if you know.
I can't imagine a Porsche engineer would wire the ignition switch starter position directly to the solenoid even in a 1994 build. The relay is inexpensive and easy to get to so. if it is present, it seems to be a no -brainer to just replace it and see if the problem disappears:
I can't imagine a Porsche engineer would wire the ignition switch starter position directly to the solenoid even in a 1994 build. The relay is inexpensive and easy to get to so. if it is present, it seems to be a no -brainer to just replace it and see if the problem disappears:
I think if you check the PET you’ll find no starter relay present in the fuse/relay box in 1994. I don’t have access to the PET now or I would check it. I recall it saying 1997 and later but it’s from memory. Not sure how P made the connection from ignition switch to starter in 1994.
I think if you check the PET you’ll find no starter relay present in the fuse/relay box in 1994. I don’t have access to the PET now or I would check it. I recall it saying 1997 and later but it’s from memory. Not sure how P made the connection from ignition switch to starter in 1994.
Even when the starter relay in the fuse box was incorporated, the ignition switch pin #50 still provided the current for the starter solenoid
versus using the starter relay to provide the actual current.
Even when the starter relay in the fuse box was incorporated, the ignition switch pin #50 still provided the current for the starter solenoid
versus using the starter relay to provide the actual current.
Loren, so what is the purpose of the gray 40 amp start relay in the fuse box? Not trying to extend this post just curious how that circuit works and why my intermittent no crank issue disappeared after I replaced that gray start relay.
I can't imagine a Porsche engineer would wire the ignition switch starter position directly to the solenoid even in a 1994 build. The relay is inexpensive and easy to get to so. if it is present, it seems to be a no -brainer to just replace it and see if the problem disappears:
True what You say about the engineers but don't forget that they wired the head lights right throug the panel switch and column stalk without any ralay!
I think if you check the PET you’ll find no starter relay present in the fuse/relay box in 1994. I don’t have access to the PET now or I would check it. I recall it saying 1997 and later but it’s from memory. Not sure how P made the connection from ignition switch to starter in 1994.
If what you say is true the relay probably was part of the added feature in 1997 where the driver must hold the clutch peddle down in order for the starter to work as this feature appeared on 1997 - and up vehicles.
Loren, so what is the purpose of the gray 40 amp start relay in the fuse box? Not trying to extend this post just curious how that circuit works and why my intermittent no crank issue disappeared after I replaced that gray start relay.
It allows three control inputs, the immobilizer, the clutch pedal and the ignition switch, to affect whether the starter solenoid gets 12V.
07-11-2019, 08:09 PM
