Immobiliser question

[Tizzy]

My ‘89 944 has what appears to be an OEM fit Porsche branded immobiliser which is a flat blade chip key which slots in near the ignition key. The red led on the dash flashes either slow or fast. Currently it seems to be stopping the car starting. Should the immobiliser key just be inserted until it beeps then removed before starting the engine? Can it and the alarm be bypassed / removed?

Thanks

Chris

 

[sutters]

This happened to me last weekend, filled up with fuel at the services, went through the process as I have done for ever and the car wouldn't start, the starter motor completely immobilized. All gauges jumping to attention as normal. The car sat at pump 13 (unlucky for some) for short of two hours whilst I awaited the RAC. I was so bored I got back in and decided to give the car a go again. The dam think only fired up first time, insert H&S fob beep beep beep,. remove and turn ignition key. Rang the RAC who was getting close. He suggested i turn the car off and if it starts again without issue just get the hell out of there (100 miles home). it did and I did.

Summary, no idea why it did it and its not done it again.

The immobilizer is being disconnected tomorrow as I cant afford to have that happen again. I will review security once Le Man classic is completed.

Ian

 

[blade7]

Mine does this occasionally, I find gently moving the key away or towards me allows the engine to start. I believe new parts are still available to repair the key/socket. Not sure how simple they are to fit though.

 

[944Turbo]

Bought a new socket (from Hamilton and Palmer) for my coupe 10+ years back, it pushes out of the steering column shroud and was soldered into a loom under the radio, It is an easy swap if you can solder, guess it could be crimped in if not!
Tony

 

[Tizzy]

Thanks all - so to be clear, I should just insert the immobiliser chip (mine appears in very good condition) until it beeps a few times, remove it, turn the ignition key and the engine should start?

Much appreciated

Chris

 

[blade7]

Is it obvious how the wires reconnect?

 

[944Turbo]

Thanks all - so to be clear, I should just insert the immobiliser chip (mine appears in very good condition) until it beeps a few times, remove it, turn the ignition key and the engine should start?

Much appreciated

Chris

Yes, when the socket is worn then it doesn't always register the chip, and back to your original Question, I think the flashing responds differently depending on whether it has registered or not, sadly nbot driven my coupe for a while so cant recall exactly, my cab no longer needs it as it had a newer alarm/immobiliser fitted.


The immobiliser can be removed, but the sections it bypasses (fuel pump, starter, ignition circuits) have to be reinstated, probably best left to an alarm specialist.

 

[944Turbo]

Is it obvious how the wires reconnect?

The new socket had the same colour wires as the old one, and the join was existing under the radio, I assume the join there made the original install possible.


I just removed the shroud from behind the steering wheel traced the old cable back, snipped at the existing join, removed the socket from the shroud, pulled the new cable through and re-joined. I can't recall now if it was 2,3, or 4 cores, but the colours matched. Then seat the new socket and put the shroud back. Mine went from working 1 in 4 (with a wiggle or twist) to working every time,
Tony

 

[sutters]

Thanks all - so to be clear, I should just insert the immobiliser chip (mine appears in very good condition) until it beeps a few times, remove it, turn the ignition key and the engine should start?

Much appreciated

Chris

yep that's how it SHOULD work.

 

[blade7]

Is it obvious how the wires reconnect?

The new socket had the same colour wires as the old one, and the join was existing under the radio, I assume the join there made the original install possible.


I just removed the shroud from behind the steering wheel traced the old cable back, snipped at the existing join, removed the socket from the shroud, pulled the new cable through and re-joined. I can't recall now if it was 2,3, or 4 cores, but the colours matched. Then seat the new socket and put the shroud back. Mine went from working 1 in 4 (with a wiggle or twist) to working every time,
Tony

Thanks. Need the immobiliser for insurance, and don't fancy paying for a modern setup when I never leave the car anywhere. And it's in the garage 99% of the time.

 

[Tizzy]

Thanks to all for the replies. After a little more experimentation I now know the immobiliser works just fine, however there is a large fuel leak from under the car just in front of the torsion bar, which kinda explains why the engine won’t fire! Looks like replacement fuel line required!

 

[Waylander]

That’s a big expensive job to do right

 

[sutters]

I've just had an auto electrician disable my immobilizer, I have the small red light flash when ignition off, so dummy Immobilizer with out the fear of getting stuck somewhere.I will address security when i'm back from Le Mans classic but tbh the cars garaged o/n so I'm non too worried.