Porsche_928_Euro

I own a 928 928 Porche that dies right after stat up( will not stay running especially if you touch the acclerator...
I bought the gauges to check the fuel pressure... I intalled it in series in the line on the control side of the warm up regulator that is right above the thermostat housing... measure 3.5 Bars...
than i went to the Banjo fitting side of the regulator the inlet... Reccomended by 928 International.... that also measured 3.5 Bars...
Replaced fuel pump With new Boche Unit...( one question about this pump the fitting that threads into the pump it self is different... looks like there is a spring pressure check ball in the fitting it self... must this componet be used I did...just curious.....had to cap the end off as it was open?
also the pump was very noise not that is solved....
I removed the filter out of the tank it self and cleaned... removed the fuel accumulator blew it out and the fuel filter is very new...
cleaned the small screen on the regulator fore mentioned... but what about the screen on the fuel distributor... not sure where that one resides?
replaced all suspect vaccum hoses....
I am at a loss can anyone be willing to help...
I am a new Porche Owner....
I have been doing a lot of reading on this CIS system...
Also am I correct that my particular ca has no ECM? nothing in the kick panel...
but in the toe board...rows of fuses and relays
I do have the Airbox off of the car as well...
that you for your attention...
Phil................. Ga,
if I have made any wrong statements please correct me thank you

GlenL

I take it that you've got an '80 Euro car.

Sounds like you've gone pretty far on anayzing this for the control pressures.

The screen at the distributor is on the feed line. Sort of hidden inside an adaptor fitting. Looking from the left side of the car, it is the further-in fitting. A good thing to check.

Have you checked for spark and the spark advance? How about green wire abrasion? That's the lead from the distributor to the silver spark control box.

Have you tried fogging it with starter fluid when it starts to die?

Porsche_928_Euro

Yes it is a Euro car.... No I have used the starter fluid while the car is trying to die that would surely tell me if it is indeed fuel.... related...
As I am a new owner..... I am on a learning curve....
And negative on the spark Box..... check.............! what should I do
And the small screen I was reoffering too is that on the Banjo fitting to the fuel distributor....
one other note that fuses gave me allot of problems early on.... could this also be causing this head ache....?
I have German owners Manual... is there a conversion to english on this forum that would let me label these fuses and Relays.... so I know whats what?
I will soon have service Manuals to aid me on the up keep....
but for now I am Blind....

s928s

Where are you located..there may be help near-by

Porsche_928_Euro

I am just Outside of Atlanta.... Near Newnan... and Peachtree City.... Georgia.....
Wow that would be nice....if that is possible...

Brett Matthews

Hi Phil,
Welcome to 928's!
Here, try this out;

https://www.928gt.com/default1.htm

And if that doesn't work, at the top of a thread, you should see a "928 Specialists" banner, just click on it, go to the next page, and a sidebar should come up, with a linc to fuses and relays, click on that, and a choice of years comes up. Your choice will bring up a chart, telling where what fuse/relay goes to what.
Hope this helps answer one of your questions....

I too, am fighting a non-running issue, but my car ('87 S4) will run for 3-8 minutes, THEN dies. Then is hard to start, and will not run at idle. Gotta keep jazzing the pedal. Hope you find your problem soon....

Porsche_928_Euro

Thank you for that link that really helped big time as far as knowing what theses fuses are .....good luck to your issue also....if I run across anything on your issue i will let you know...

Best of Luck...

GlenL

Just thinking you might want a new screen name with an "s" in Porsche.

Look for the lead running from the distributor. It is green, or is when new. Make sure it is not touching the block and doesn't have any damage. It cariies a very low-level signal to the "brain" for these car.

Yes. Just hiding in there.

Bad fuses sounds like a typical problem. Don't see how it's related, though.

The oweners manuals are fairly useless. You might pick up a similar-year US version. I understand there are English versions for Euro cars out there.

Go here for fuse and relay charts
https://www.928gt.com/

Check out and bookmark this:
http://www.nichols.nu/tips.htm

I've got a web site where I occasionally up-load links. Lots of links for parts and owners websites. Days worth of browsing:
http://home.earthlink.net/~bigdadglen/

WallyP

Make sure that the air flap (under the air cleaner) moves freely.

Contact Jim Morehouse and get the 928 tech info CD set that he has prepared. Jim had every scrap of 928 tech info that he could buy or borrow scanned, converted to pdf, and burned to CDs - a HUGE amount of info. Jim's email address is
jim928ATptd.net (change the AT to @ - just trying to keep the address-gathering 'bots at bay).

Glad that our web site helped - there is a lot of other tech info on there, as well as 30,000 parts with prices!

Porsche_928_Euro

I did not realize I miss spelled Porsche.... OOPs.........So I would like to creat another account using the same email... I feel kind of silly....

On Topic i will try and see further if I can find out why this car will not stay Running ....

Porsche_928_Euro

I was told that this year of this car had only Relays and fuses with the use of pressures and mechanicle devices to make this CIS system work....while the fuel injection is Plummed right into the manifold....Is this correct....

GlenL

For the most part, yes. There is no computer on the car. The fuel injection is determined by a mechanical system. The spark is set using an old-school system of vacuum and mechanical advance inside the distributor.

Dennis Wilson

On the CIS system you measure control and systems pressure in the line between the control pressure regulator (WUR) and the center oulet on the fuel distributor. The valve of the tester must be on the WUR side to get proper measurements. If yours tested out at 3.5 and 3.5 you have a system pressure problem as it should be about 3 bar higher. This will make the engine starve for fuel. Did the 928 sit for a long period of time before you got it?

Dennis

Porsche_928_Euro

Actually yes it did sit...... But when it was first started after sitting for avery long time It ran great.. it all of the sudden started this Not running Situation... I did not quite get what you said the Proper layout of the Gauge should be....

which side should the Valve be on?
I tested Control Pressure if I did it right on the Line from the WUR to the center of the Fuel Distributor Measured 3.5 Bars wich from what I can tell is correct... but the System Pressure going into the Regulator is not Correct..( 3.5 Bars measured with Valve open) that should be 5.5-5.8 Bars... Which I measured that for the Inlet side of the WUR Now the one question is what is the function of the Valve should it be Open or closed?
Please correct me if I am wrong only way to learn...
Please Help...

Dennis Wilson

To check the system pressure the valve (on the WUR side) must be closed. It would seem that something dislodged and is blocking part of your fuel system. If you haven't changed the filter, that should be your first step. Next you should measure the output of your fuel pump at the fuel distributor. It should pump about 1.1 liter in 30 seconds. If those are OK the blockage is probably in the fuel distributor relief valve or the distributor itself. You could also try running some Berrymans or Techron through the system.

Dennis