I really need your help. Please!!!!!! Porsche dies

[Bullseye123]

I need all your help before I go crackers

I have a Porsche 911 1987 3.2 supersport.
It was my childhood pin up car. I bought it 2 months ago. So here is the problem.

Start the car , set off great. park it up lock and leave. return press immobilsier and opens and beeps. great. Turn the ignition, car starts, great. runs for 20 or so secords then dies.NOT SO GREAT
The car will not restart. Get out lock it up. leave 20 minutes return and car starts up and off we go. great.

Now everyone said change the DME relay. Did do but problem remains.
Now Im fiddling with the radio with the engine on . I press the radio reset button and car power goes just like before. will not restart. I have a scorpion 1218T2 alarm /imobiliser.

Please can any of you petrol heads offer some advice.
Tony
United Kingdom

[superlightr]

bummer - diapointing for you. Sorry I cant help but good luck.

[GreenV8S]

Could be an imobiliser fault?

[iguana]

Car alarms: particually older ones= agghhh- they are in the main hateful & fecking annoying soddin' things that cause so much grief & they have been ripped out of a few cars & a 'bike of mine for the they've caused over the years.

Investigate all the other options, but most roads do indeed lead to the issue being the alarm.

[rich 36]

Read your post here a couple of times tonight, and still think problem is the non-porsche part, the alarm.
I had probs with an immobiliser before you, and, i really think, i'd start there, before wasting money on parts for motor.
That alarm either needs competently checking over for a short, or it needs removing/replacing.
keep us posted please

[philly]

GreenV8S said:

Could be an imobiliser fault?

That's what I would put my money on. My '85 3.2 Carrera started randomly dying so I checked all the usual stuff DME relay etc.

Last weekend I dismantled the immobiliser (Laserline) and there's a bad dry joint on the leg of one of the (two) relays and the circuit board is singed around it.

I always thought that immobilisers were meant to "fail safe", but it's clearly not the case.

Hope you get it sorted soon.

Phil.

[rubystone]

You really need to take it to an autoelectrician - I can recommend a good one if you are in Essex. The fault may be totally unrelated to anything you've tried up to now and best not to touch anything else.

[Harris_I]

My after-market alarm/immobiliser in an 86 Carrera 3.2 was a nightmare. Similar problems with a 93 Integrale I used to own.

With older cars I would recommend junking whatever after-market electronics are already in there and starting again.

Still, as Rubystone says, best to get a pro to take a look.

[aceparts_com]

Did you say that if you turn the radio on the car stops?

[pdV6]

aceparts_com said:

Did you say that if you turn the radio on the car stops?

Just your car's way of saying "concentrate on the drive, or I'm not playing"

[aceparts_com]

If so it sounds like one of my wiring jobs! In which case the radio and immobilizer are earthed at the same point which tells me one thing; it's not a cat 2 immobilizer as this must have two seperate earthing points at least 18" apart. Get a new immob fitted properly. Make sure it's a thorough CLEAN fitting i.e. old one taken out, wiring put back to standard and then new on fitted.

[Bullseye123]

the ignition is not fused to the fuel pump. What does this mean

[agent006]

I'd second the immobiliser theory. Get it checked out by a specialist who'll know what bits are proper porsche kit and what aren't.

Still not sure why it needs 4 posts to the same forum in a week though.

[Bullseye123]

red fuel pump relay !!!!!!!!!!!!

fault on ecu , dodgy cylinder head temp sensor.

fixed runs a treat.

4 months of hair pullling over thank god!!

cheers for all the comments folks

>> Edited by Bullseye123 on Thursday 24th February 19:03