924S no start

[Toast54]

Hi
I'm hoping someone can point me in the right direction. I replaced my fuel pump (twice) last summer, drove it up until cold weather started, so I have had it put up until 2 days ago. It started and ran fine, until today. When I came out to leave work, it started, ran fine for 20 seconds or so, then died. Although it would turn over it wouldn't start. I checked the fuel pump fuse, checked (listened for the "whirr" of the pump) and also checked the fuel rail for pressurization...nothing. An hour later, after I grabbed my meter and tools to check for voltage, I decided to try starting it and it fired right up w/ no issues and I was able to drive it home, where I've started it several times since. Anyone have ideas I might try to find this?
Thanks

[John_AZ]

Did you replace the DME/fuel pump relay?
DME Relay Information and Testing

Ballysdad did a "No Start Checklist"
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/484996-let-start-no-start-checklist.html

Or just review ideas on Clarks-GArage:
Clark's Garage Home Page

When you tried to crank the engine, did the tach needle bounce 1/16th of an inch ?

If not, could be the reference sensors.

Is the battery at absolute full charge after the winter break? If the battery was weak it may have harmed the delicate electronics.

GL
J_AZ

[Toast54]

Thanks for the info. Mine appears to have a 5-pin fuel pump relay. I mention this because the 944's have a 6-pin DME relay I guess. I'm going to make a jumper set and have it ready for my next "episode"

[Rasta Monsta]

Or put in a new relay.

[nynor]

intermittent bad connection at the reference senders plugs, perhaps.

[Toast54]

I'm not one to throw parts at a project and see if they stick. I am puzzled as to why the tech info on the DME relay indicates I should have one since its a 1987 model and the EARLIER models have a fuel pump relay



I think this is it from the manual and the wiring numbers

[nynor]

they both have a DME relay. the one you have pictured is not it. but i could be wrong.

[Toast54]

You are correct, Sir...and I am humbly mistaken
I think the numbers on the relay had me confused..At any rate, relay # 2 on the block is listed as fuel pump(according to the owners manual) and after I pulled it, it has DME relay printed on it The numbers 30,85,85b 86 and 87 are in parentheses Thanks
Ill make my jumper for this socket

[nynor]

i remember having the same confusion with my '83 944. i am not sure where the relays are located on the 924S, in the '83 they were stuffed under the dash and it ridiculously hard to get them out and/or see what they were.