924Board.org

bkantelis · Joined: 07 Nov 2005 Posts: 50

Self inflicted on top of things I believe. 79 924NA sat for about 4 years while I worked on it. New injectors, wires, dist cap, plugs, fuel pumps (both), fuel filter, flushed tank.

Lit it up and it ran just fine. Filled the tank and added......1 can seafoam. Drove about 25 miles, ran great.

Sat for a day. Starts fine, idles a little rough, press the pedal and pop, sputter and die. Repeat forever.

Emptied the gas tank of now light brown gas. Replaced fuel filter (dirty), cleaned fouled plugs. cleaned gunky injectors, pulled in-tank pump and the filter on it was perfectly clean.

Same problem but I also notice that the fuel pumps do not seem to stop when you turn the key, they continue to run instead of the usual pulse then silence.

Any pointers on diagnosing this mess would be appreciated.
Regards,
Bruce
_________________
1979 NA 924
Georgia, USA

emoore924 · Joined: 13 Apr 2004 Posts: 2822

Frustrating I'm sure, but disaster, perhaps not.

Given that all was well before the sea foam application, all that might be required is the cleanout of the fuel system, the reintroduction of clean fuel and you should be ok. Might mean cleaning the tank, lines, accumulator, filters, etc., but I would think you'd be ok after that....

bkantelis · Joined: 07 Nov 2005 Posts: 50

Cleaned the tank again as well as the injectors and plugs. The injectors and plugs looked ok and the pattern from the injectors was good. With fresh gas, same problem. Something else going on.
_________________
1979 NA 924
Georgia, USA

scm924s · Joined: 22 Oct 2010 Posts: 296 Location: Gloucester UK

Possibly clogged filter in the WUR?
_________________
1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold

Harm · Joined: 02 Apr 2009 Posts: 1378 Location: Holland

bkantelis · Joined: 07 Nov 2005 Posts: 50

Driving me crazy. Brand new wur, no clogs anywhere, replaced dizzy, tested the fuel pumps and pulled the internal pump and filter is clean. Replaced filter in the engine bay. Plenty of fuel flowing. Idles fine, give it a little throttle and it starts popping and dies, never gets over 1000 rpm
_________________
1979 NA 924
Georgia, USA

scm924s · Joined: 22 Oct 2010 Posts: 296 Location: Gloucester UK

My '77 Martini is behaving just like that. Been stood for 12 years, fires easily and won't pick up and keeps dying. Eventually found if you fire it up on part throttle and hold it about 2/2.5k revs it will run with a fair bit of popping and spitting until it warms up and then it's OK, just don't let the revs drop.

Obviously a cold start problem, if you have a new WUR, only leaves the AAV and cold start valve? You have no vacuum leaks?
_________________
1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold

Harm · Joined: 02 Apr 2009 Posts: 1378 Location: Holland

Paul · Posted: Mon Mar 12, 2012 11:19 am Post subject:

Check for vacuum leaks. Hook up a vacuum gauge and report back what you see when the car is idling.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.