924Board.org

Unfortunately_Inept · Joined: 13 Apr 2006 Posts: 8

Hi all, new member here, seeking a bit of help. Quick background, i bought the car when i was 15, im 22 now, worked on it during the cold Canadian winters, always enamored by the 924's bodylines.

Anyway, to my issue... The electrical system has been acting up recently, my fuel pump is no longer running, so after buying a new pump and a new relay, im still having the same issue. I took the relay out and jumped it as shown in the haynes, and it turned the pump on, but when i pop the relay back in, theres no power, yes, the fuse is good, ive jumped it also, still nothing. So im kinda stuck, wtf.. if it was a ground, then jumping it wouldnt change anything right? also, on a seperate issue, the car wont shut off when i manage to get it running.. i can pull the key out and put it into my pocket, and it still runs.. the only way to stop it is by pulling the coil wire... ive already switched the ignition switch, it didnt change anything.. so... im kinda in a perpetual circle of crap.. i cant get it running, and when i do, i cant shut the damned thing off!

Khal · Posted: Thu Apr 13, 2006 10:50 am Post subject:

Umm... ignition switch?
_________________
'80 924 Turbo

Unfortunately_Inept · Joined: 13 Apr 2006 Posts: 8

changed it already, wish it was that simple...

Khal · Posted: Thu Apr 13, 2006 10:52 am Post subject:

Sorry, missed that!

Welcome to the 'board

_________________
'80 924 Turbo

Smoothie · Posted: Thu Apr 13, 2006 11:22 am Post subject:

The relay needs to see a signal from the ignition, so check the ignition wiring.
Also post the year and model of car you have - better yet, put it into your signature area so it shows autmatically.
There may be other things to check depending on the year and model.
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Unfortunately_Inept · Joined: 13 Apr 2006 Posts: 8

sorry, 78 924

thanks for the welcome Khal!

when the ignition key is on, power is sent to a female connecter on the fuel relay, as well as a constant battery power...

Ozzie · Posted: Thu Apr 13, 2006 11:35 am Post subject:

I'd check the wiring to the ign switch. You may have crossed something.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Unfortunately_Inept · Joined: 13 Apr 2006 Posts: 8

ok, ill take a look, do you think their related? is it possible?

Smoothie · Posted: Thu Apr 13, 2006 11:48 am Post subject:

Ozzie · Posted: Thu Apr 13, 2006 2:05 pm Post subject:

He jumped the fuel pump relay.
Fine.
But power to the relay comes from the ign switch
wont start
Power to the ign module comes from the ign switch.
wont stop
Follow my logic?
Did this start before or after he put a switch in?
If its a new switch then wiring must have got crossed somewhere.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Smoothie

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

Inept,

You do know that there are two parts to the ignition switch, Right?

They are the key cylinder and the electrical portion of the switch.

Did you replace the electrical portion of the ignition switch or the key cylinder portion of the ignition switch? Did you buy a new part from a Porsche Dealer, or get a used part from a salvage yard, or get a new part from an aftermarket supplier of some sort?

Identical looking electrical switches are used in many other German made cars. Unfortunately, last year I became aware that the electrical portion of the switches that look alike, ARE/CAN INFACT BE DIFFERENT. Yeah, a switch from another make of car can fit normally, but when installed in a 924, may not work correctly. It has something to do with the internal arrangement of the electrical switch. If you bought the electrical portion of the switch from somewhere other an a Porsche Dealer, it is possible that you got the wrong one.

If you got a used electrical switch portion from someone, it is possible that the one you got is defective.

It is also possible that if you replaced the electrical portion of the switch, and you got the right one, that the key cylinder is also broken, and the little shaft that turns in the keyed hole in the lectrical portion of the switch is hanging or damaged in some way, and is not working correctly. It is not repairable, and this would mean that you need to replace the key cylinder.

If you replaced the key cylinder, you need to go back and replace the electrical portion of the switch. Now that you know that there are different ones, it will be easier for you to get the right one.

Unfortunately_Inept · Joined: 13 Apr 2006 Posts: 8

hey guy, thanks alot for the feedback, its helping me grasp the issue alot better. they ignition switch i changed was the electrical part, and it was from www.partsheaven.com ; a new piece. theres a harness on the back of the ignition switch, and i didnt cut it up, so i didnt cross anything. after playing with the relay tonight, i did a conductivity test between 31b and the coil, it was ok. im getting power from the switch, and the constant battery, as well as power going across my fuse. what i did check, is that there is no power coming out of my relay to the pump, and considering it was a new relay, im really stumped.. is there another piece that would stop power from flowing through the relay?

Unfortunately_Inept · Joined: 13 Apr 2006 Posts: 8

oh, if i supply power to the fuel pump by another source while the relay is plugged in, the car runs.

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

The next question is did you get the right relay?

Have you tried measuring the voltage from the output of the relay switch when the power is supplied to the relay coil? You can reach the back of the relay socket to see if anything is coming out by carefully releasing the fuse/relay panel from it's mount and reaching around the back.