elgy

I have finally got back to my 928 after parking it 2 years ago. I have changed the right side CV boots that were leaking, replaced the right side rad tank... that was leaking, rebuilt the TB tensioner, retensioned the belt, changed the oil and the coolant.
The first time I started it after a few coughs and sputters it caught, but with difficulty. After a few minutes it settled down to a nice idle, but giving any gas would cause it to die or almost die, but then it would settle down to a nice idle again.
Second try today was very similar but after letting it run a bit, less than 5 minutes I was able to get it to go all the way up to 2000 rpm without dying. So it seems the maximum possible rpm is moving in the right direction.
Can I expect that with more running it will clean the old gas and crud out of the fuel system and run normally?
I don't have a lot of confidence in the fuel pump, could my symptoms be caused by a pump not delivering enough pressure? I have a new fuel pump but I need a fitting before I can install it.
Thanks for any comments.

Jadz928

If you haven't assessed the fuel delivery system on a 2 year hibernating CIS 928, I'd start there.
Check fuel quality, change fuel filter, change fuel pump feed hose... at minimum.

Check, clean or replace fuel inlet screen adapter on the fuel distributor.

Consider cycle-flushing the CIS system with Berrymans B12 via a jumpered fuel pump relay (#17).

Then get yourself a good quality fuel pressure gauge, check and adjust CIS fuel pressures to spec.

Then tune air/fuel ratio & idle.

PS. Make sure you have good spark plugs, plug wires and general ignition too.

GlenL

There's always hope. That happened on the two CIS cars I bought.

I would replace the fuel filter. Then give it a half fill with some Seafoam or your favorite fuel system cleaner. Drive it around as best as you car.

Jim gives good points. I do disagree with changing pressures on a poorly-running system. The gunk in the system will change for better or worse and then you're chasing that with re-tuning. Maybe my opinion is colored by that I'm bad at it.

elgy

Today after warming up I was able to get up to 3000 rpm with a bit of stumbling, but clean acceleration from idle to 2000... time to take a drive around the block!

elgy

Update and question...
I have the 928 back on the road and have been running around with it for about a quarter tank of gas, mostly city streets with a couple of short highway runs. It is running much better, a little rough on startup, then a bit of stumbling till it gets warmed up (I don't wait, pull out of the driveway as soon as it starts).

The only problem now is a very high idle, around 1500 rpm, once it is warm. I know that soon I have to check and clean the whole fuel system... but in the mean time can I just adjust the idle down a bit without it dying on me while it is cold?