Ignition switch

[Stimorolgum]

Hello

When turning the ignition key nothing happened, and the spring loaded start position was not there
My ignition switch was replaced by a new one from Porsche. (Picture below)

And now I have the same problem again. Do I need to change the lock cylinder??

[nickelplated5s]

Get a wiring diagram and a volt meter. It will take two to test.

[Stimorolgum]

Thank you for your answer

But I'm confident it's not a wiring problem.
Sometimes I starts when the starter spring feeling is there.
Seems to be a common problem with these old cars.

Maybe the metal pin that goes into the switch doesn't have a tight fit?

[EC900]

My 2¢…

I had this once or twice, but the problem went away after more driving and ignition use. I passed it off to dirty contacts and ground. I guess the key spring back is more evident when the car starts the funny thing is I never paid attention what it felt like when it didn’t start (no click, no nothing) but usual dash light indicators.

Not sure -but if the switch portion is electrified for the spring to react or if it’s in the lockout mechanism.
If the lock-out mechanism, did you try to wiggle the steering wheel, may be too much tension in the lockout as it interacts with the switch.

When-the car does start, there isn’t any starter gear grinding…right?

Also I cleaned battery terminals and both ground straps (trans & battery)

[47silver]

https://forums.pelicanparts.com/porsche-911-technical-forum/348306-ignition-switch-inside-fix-start-lockout.html

check this out.

[spuggy]

Originally Posted by Stimorolgum

Hello

When turning the ignition key nothing happened, and the spring loaded start position was not there
My ignition switch was replaced by a new one from Porsche. (Picture below)

And now I have the same problem again. Do I need to change the lock cylinder??[/img]

What year car old chap, what car?

SCs and later have a lockout mechanism in the lock itself. Which you can remove if it doesn't work properly - however, it's just more to go wrong.

My '77 and an unidentified "earlier" lock assembly - neither have a lockout mechanism in the lock itself. Remove the electrical portion, put the key in the lock and the key will turn endlessly as many times as you like/in any direction you like. Perhaps someone removed the lockout from both before I got them - but certainly neither lock has a mechanical lockout now...

Now, the electrical portion (the switch).

The 911-613-017-01 switch didn't have an internal lockout. You could move the switch from On to Start, let go and hit Start again as many times as you liked without having to switch it to Off.

The 911 switch was more expensive than the 964 switch when I bought my car. I watched it get more and more expensive until it was 2x the price of the 964 switch.

Then the 911 switch went NLA perhaps 10 or so years ago.

In 1985, Porsche began fitting the 964-613-012-00 switch. It is now the only starter switch you can buy from Porsche (the older switch is now superceded).

The 964 switch has an internal lockout. Yes, in the electrical portion itself. Turn the key to Start, release the spring tension to On - it won't go back to Start again unless you turn it to Off first. Only then can you try again.

I have multiple 964 switches - they all have the internal lockout and they all behave the same. Try it with a screwdriver. I keep meaning to take one apart to try and remove the lockout...

I also have several 911 switches - none of which have a lockout.

So if you find if the electrical portion, once disconnected from the lock, reliably goes to spring tension/Start - from the Off position, once - that's actually Working As Designed for the 964 switch. Which is all you can buy now.

However, if it doesn't work when all assembled, then sounds like your lock has a dodgy mechanical lockout as well, and it's likely causing problems - and my vote would be to just remove it.

[Aurel]

I had a similar issue recently, and I decided to bypass the ignition switch with a start-stop switch…

https://forums.pelicanparts.com/porsche-911-technical-forum/1164607-installing-start-stop-switch.html

[Stimorolgum]

Thanks for all the feedback

I just bought the switch from Porsche so it's probably the 964 with the internal.
I could probably disassemble the whole mechanism and se if I can remove the pin and spring?

It's a 911 2.4 T from 1973 and about 140000 miles