924Board.org

aeryck · Joined: 03 Nov 2010 Posts: 18 Location: Park City UT

it starts up great cold, in the cold after sitting over 6+ hours sitting. It starts great after warming up and stopping for groceries. If it sits for between (this is the best I can tell so far) 25 mins and 4 hours it acts like it's flooded? I know the new aux air regulator is working well, obviously, so is the warm up regualtor. Is there some sort of evap system for the fuel that would cause this? Any ideas?

BionicBalls · Joined: 05 Jan 2009 Posts: 642 Location: Charlotte, NC

Fuel Accumulator.
_________________
1980 924 NA
1982 931

MRPETE · Joined: 07 Nov 2010 Posts: 67 Location: CALGARY AB CANADA

I agree. how are your injectors? Do they leak?
_________________
'77 924
"81 924
Lots o' Corvairs

aeryck · Joined: 03 Nov 2010 Posts: 18 Location: Park City UT

injectors seemed perfect at the beginning of the summer when I last checked. Fuel accumulator makes perfect sense, as does leaking injectors. Where is the accumulator?

garyj19 · Joined: 04 Sep 2005 Posts: 226 Location: Connecticut

its under the right rear of the car next to the gas tank.

if you want to make sure thats your issue hook up a fuel pressure tester and see if pressure drops (slowly or not) after you shut the engine off
_________________
early 77 924 na

aeryck · Joined: 03 Nov 2010 Posts: 18 Location: Park City UT

thanks, I'll do that. The fuel pump is new, a Walbro, less than 4k on it, so, I'm pretty sure that's working well

aeryck · Joined: 03 Nov 2010 Posts: 18 Location: Park City UT

whew, thank god mine is actually a 78, price jump to 79 is dramatic to say the least

BionicBalls · Joined: 05 Jan 2009 Posts: 642 Location: Charlotte, NC

You can test your accumulator by unscrewing the little flat head screw at the bottom of it. If gas comes out, it's bad. You ahve to run the car for a minute to give it a chance to accumulate the fuel.

Some cars have 2 20cc accumulators and it is recommended that you upgrade them to 1 40cc accumulator. If you got the cash, buy new, but often you can buy 3 or 4 used ones for 50 bucks total and at least one is usually good.
_________________
1980 924 NA
1982 931

aeryck · Joined: 03 Nov 2010 Posts: 18 Location: Park City UT

great info, thanks BB. I ordered a new one, it must be the 20 cc, I'll just have to to look and see if there are more than one, I hope not.

brealytrent · Joined: 28 Dec 2008 Posts: 414 Location: Goldsboro, NC

I have the same problem with my n/a. It's fine most of the time, but if it sits for only about 3-4 hours (a very specific time-frame) it won't start. I've gone through the entire fuel system - flushed, replaced the filter and accumulator (replaced w/40cc), and had the distributor rebuilt, but this still happens!

Oh, and if you are getting the 20cc, there are two of them.
_________________
1977 Porsche 924 - sold
1980 Porsche 931 - sold
1984 Porsche 928 'S2' Euro - sold
2016 Ford Fiesta ST - sold
2009 Porsche Cayman

MRPETE · Joined: 07 Nov 2010 Posts: 67 Location: CALGARY AB CANADA

Put your foot to the floor after 15 minute thing It works But as the other guys have said check your accumulator(s) andinjectors .After that ask the
guys Pete
_________________
'77 924
"81 924
Lots o' Corvairs

stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

I had some debris or a nick in an o-ring in the my fuel pressure regulator (screwed into the side of my fuel distributor on my 931) that caused a similar problem.
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.