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 Post subject: New member can't access technical forum
PostPosted: Sun Dec 08, 2019 11:58 pm 
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Joined: Sun Dec 08, 2019 11:44 pm
Posts: 10
Model: 924
Greetings to all. I just bought a 1977 model 924 from the guy who has owned it for the last 38 years. It's surprisingly original and in great condition, but it doesn't run.

I think the fuel pump relay is defective, but I'm not sure as I have absolutely NO experience with Porsches. I thought I'd try out the club to see if the technical forums are worthwhile. I never saw anything saying that trial membership didn't include access to the forums. I'm not a "chatter", but do offer my experience on other forums when I have something worthwhile to contribute, but that 's only on the technical forums. If I can't get to them I see little value in being a member. No offense intended, it's just my opinion.


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 Post subject: Re: New member can't access technical forum
PostPosted: Mon Dec 09, 2019 1:09 am 
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Joined: Sat Dec 01, 2007 1:25 pm
Posts: 6836
Location: Worcs, UK
Model: 2 x S1 Turbo
Welcome along. The technical forums are for paid-up members only, and the statement on the membership page reads "You will gain limited access to our forum for 3 months, and will have the opportunity to ask a couple of 'new owner' technical questions or request buying advice for example, and get a taste of the support that we all offer each other."

Sorry if you feel that wasn't clear, but please ask your question in the New Owner Technical section and we'll do our best to help.

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924 Turbo red/white magazine star - 924 Turbo brown wreck - 911 C2 Cab for the British Summer - Hyundai Kona for 280 miles of petrol-free silence
Don't bodge it - FIX IT!!
Just because it's on eBay doesn't mean it's a bargain...


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 Post subject: Re: New member can't access technical forum
PostPosted: Mon Dec 09, 2019 1:39 am 
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Joined: Sun Dec 08, 2019 11:44 pm
Posts: 10
Model: 924
Thanks for the quick reply. I didn't see the new-members' technical section. I'll try it out. I've scanned through a few pages of it to see if I could find where someone had already asked my question, but found nothing. Looks interesting, though.


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 Post subject: Re: New member can't access technical forum
PostPosted: Mon Dec 09, 2019 12:27 pm 
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Joined: Mon Jun 17, 2013 11:35 pm
Posts: 3204
Location: The little old village of Lingfield
Model: '83 924 / '80 931
TJMack wrote:
I think the fuel pump relay is defective, but I'm not sure as I have absolutely NO experience with Porsches.


It's not so much experience with Porsches that you need, but experience with the Bosch K-Jetronic injection system that the 924 used. Many other early fuel injection cars of the 70's and 80's used the same system.

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'80 924 Turbo unexpected project - now running and rolling restoration
'83 924 "Yin Yang" cheap track car with another member
'01 Vauxhall Combo constantly evolving, modified van for working / camping / band duties

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 Post subject: Re: New member can't access technical forum
PostPosted: Mon Dec 09, 2019 12:40 pm 
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Joined: Fri Jun 20, 2008 6:51 pm
Posts: 4288
Location: Europe > Romania
Model: 924
Nice car!
Paid membership also brings you one of the best magazines you have seen and the chance to get featured.


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 Post subject: Re: New member can't access technical forum
PostPosted: Mon Dec 09, 2019 2:32 pm 
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Joined: Fri May 17, 2019 2:38 pm
Posts: 187
Location: Ayrshire
Model: 1981 924 na
Hi TJMack. The Tech Forums are the Biz! I joined earlier in the year, and have had no end of help. As to the fuel system... I was clueless about this system (probably still am) but by reading through the hundreds of old posts, I at least have an idea of how it all works, and how to fix it, and where to source parts.

Oh, bye the way, Welcome! And whereabouts are you, car looks great, a left-hooker...... and strange (to me) bumpers?

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924 na in the fastest colour


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 Post subject: Re: New member can't access technical forum
PostPosted: Mon Dec 09, 2019 2:42 pm 
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Joined: Mon Jan 04, 2010 11:24 pm
Posts: 17859
Location: Gloucester
looks to be a US spec car so some of the tech advice may not be helpful as these cars have some dedicated Federal emissions requirements.

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2004 Toyota MR2 Roadster Red Edition-Lock down project.
1984 924 N/A Ruby Red Metallic - 924 of the Show, National 2018
1988 924S Guards Red - sold
1986 924S Guards Red - sold
1984 924 N/A Black - sold
1980 924 LE MANS#1 - sold
1980 924 LE MANS#2 - sold
1977 924 Martini - sold


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 Post subject: Re: New member can't access technical forum
PostPosted: Mon Dec 09, 2019 2:57 pm 
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Joined: Sun Dec 08, 2019 11:44 pm
Posts: 10
Model: 924
Thanks for the replies. I'm in the USA in the state of Florida (as well as confusion :?: ). the bumpers are strange to me as well. They were the result of some stupid idea that a car should be able to withstand a 5 MPH impact without sustaining any damage. The idea looked good on paper, but in reality it resulted in some real abominations.

I've been studying on the K-Jetronics and think I have at least a basic understanding of how it works. There are a few good videos on youtube.com that helped quite a bit. With that limited knowledge I think I've determined that the fuel pump relay is defective. It's strange to me that I can get it to "click" on the bench and close the contacts that start the fuel pump, but in the car it does nothing. I have checked the voltage as well as the grounds ( I guess you guys call it "earths" ) in the sockets where the relay goes and everything looks as it should, but the relay doesn't engage when I put power to it while in the car. Very confusing!


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 Post subject: Re: New member can't access technical forum
PostPosted: Mon Dec 09, 2019 4:49 pm 
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Joined: Mon Jan 04, 2010 11:24 pm
Posts: 17859
Location: Gloucester
The fuel pump relay on early cars is as rare as hens teeth, I got a used one from the States some years ago after searching for ages. Later ones do not fit. From memory the early fpr is triggered by a contact operated by movement of the air flap when cranking the car, slow cranking or sticky air flap won't move the flap to operate it. You can bypass the relay by putting a jumper across terminals 87 and 30 of the socket and the pump should run continually, beware this temporary circuit will not be fused, pays to put a fuse in line in the jumper. I assume you have checked the fuse mounted on top of the relay.

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To travel hopefully is a better thing than to arrive - RLS

2004 Toyota MR2 Roadster Red Edition-Lock down project.
1984 924 N/A Ruby Red Metallic - 924 of the Show, National 2018
1988 924S Guards Red - sold
1986 924S Guards Red - sold
1984 924 N/A Black - sold
1980 924 LE MANS#1 - sold
1980 924 LE MANS#2 - sold
1977 924 Martini - sold


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 Post subject: Re: New member can't access technical forum
PostPosted: Tue Dec 10, 2019 1:57 pm 
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Joined: Sun Dec 08, 2019 11:44 pm
Posts: 10
Model: 924
SCM924s Thanks for that tip!! That's exactly what was happening. I still don't understand the circuit in the relay, but I'm not an electrical engineer so I guess it doesn't really matter, but I just like to understand how things work.

This is a classic case of trying to solve a problem that doesn't exist. I was going on only what I knew from previous experience with relays.

I've cleaned the injectors and they appear to be putting out a nice spray with just a rudimentary visual test. And the fuel metering device appears to be working as well so I'm almost ready to try starting it

I'm learning as I go on this, and enjoying the ride.


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