Good Evening All- I'm new to the forum.........I own a 1978 euro 928 s/n 9288100579. I'm sad to say that i've let her sit dormant for about 4 years with some differential issues......i've got that resolved. In trying to light the fire again i've replaced the fuel relay, fuel pump, and fuel filter. Also, i've drained and refilled the tank w/fresh gas. Initially she would only start when cold w/starting fluid.........then promply die. After a while of that she would run ( sort-of ) for about 1-2 minutes....then die....starved for fuel. She now will start fine from cold...go to high idle for 10 seconds....then die. Can anybody point me in the right direction. The total run time since trying to bring her back is close to 15 minutes....is that anywhere close to long enough to begin to clear the various lines of old fuel???? The car only has 60k miles....I REFUSE TO GIVE UP!!!!

Thanks in advance- Geffen928

 

Start small - vacuum leaks

I left the brake booster off my intake the other day - did the same thing. Would start, hold high idle for a few seconds then die.

Can you get the car to stay running by holding down the pedal a bit?

Fuel pressure gauge would be nice so you know whats going on there. I have no idea how to put one on a CIS car though.

 

I dont know how to help you, but good luck.

 

Witht hat mileage she's a gem, just cling to your last statement as your new mantra- don't give up.
There are a bunch of small screens in the system that catch-- and seemingly sprout-- debris. There are screens under each fitting on the warm up regulator. You can inspect these by removig the fittings and sometimes you can clear debris with ginger and judicious use of a Q-tip. There is a big one on the feed line to the fuel distributor. Given teh age of the car, I'd just buy one and replace it. There's the injectors themselves...but buying a set is overkill at this point. One fairly easy test is to remove the feed line from the injector(s) jump the terminals at the fuse box for the fuel pump, and catch teh fuel delivered in a minute. This will help you assess any blockages in the fuel distributor. A similar test with the injectors attached to the lines but discharging into a container can help assess the injectors. And don't be afraid to change the main filter every few days 'til you get it squared away!

 

Make sure the air valve (AKA air sensor) is moving smoothly. That's a plate-and-arm arrangement that measures the air flowing in and controls how much gas goes in.

It sounds like the cold start valve is working, but check that there's 12V on that plug when starting cold. That's the fuel injector mounted on the front of the plenum, in front of the Porsche shield.

Something that should be checked is the screen at the inlet of the fuel distributor. From the outside it looks like a short male-male fitting but inside there's a screen.

Checking for vacuum leaks is a good idea as well.

Here are some links:
http://www.volvoclub.org.uk/tech/fue...jetronic.shtml
http://www.ncr-pca.org/tech/tech-cis.htm
http://www.cfmstudios.com/928fueldistributor/
http://www.auto-solve.com/mech_inj.htm
http://www.asashop.org/autoinc/june97/techtips.htm

 

I used to have the same problem on my euro. For me it was the fuel pump. Make sure you have the correct relay for the fuel pump since it is a different relay for K-Jet cars than later ones. To verify Fuel delivery you can remove the intake tubes and air filter box. Disconnect the coil. You can unscrew each injector line one by one or all together. It would be good to remove the line and injector to make sure the injectors arent clogged. To unscrew the injector you need a 12mm deep socket. Once you have either the line unscrewed or the line+injector, place it inside a jar. Then have a helper jumper the fuel pump relay pins while you watch the injector lines. You can do this yourself, just put a switch in between the jumper pins and make really long cables. Turn on the jumper, from the engine bay you should be able to hear the pump pressurize the system. If you can hear it, good. Then press on the air plate a little and fuel should spray into the jar. Just verify that you get fuel in each line all together (8 jars lol) or one by one. It is ideal to do it all together cause then you can see if you are getting roughly the same amount of fuel in each jar. If you are not, then you either need to clean your injectors (around $80) or rebuild your fuel distributor ($450). Good Luck and yes I've been there if you cant tell,

 

Nice with another 78'er. Good luck