924Board.org

PORSCHEV · Posted: Wed May 23, 2007 3:43 am Post subject: Injection troubles (help please)

Ok..I managed to get the car fired up. But it's flooding like hell.

What is actually happening is the injectors are getting wide open fuel as soon as you start cranking.

The cold start valve is not functioning. It will spray perfectly if I add in the ground.

What do I need to do to make this opposite...cold start to fire on cranking then the injectors to kick in when running.

Also the injectors seem to be putting out ALOT of fuel...compareable to what you might get at full throttle.

Thanks guys... I am off to do some more search and haynes.
_________________
1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.

Min · Posted: Wed May 23, 2007 3:47 am Post subject:

Perhaps the fuel distributor piston is stuck? .... Thats the first thing I would check.

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

scottc · Posted: Wed May 23, 2007 3:50 am Post subject:

Try turning down the mixture?

Take one of the injector lines off the metering head and with the ignition on, turn the mixture down so it just dribbles out.

PORSCHEV · Posted: Wed May 23, 2007 4:37 am Post subject:

Min wins the prise.. I was looking at the haynes diagram and it hit me...that some times when i would lift on the metering arm it would have resistance ..other times it would be just flapping freely.

I am in the process of cleaning it all up right now.

Thanks again guys...you really do rock.

Going to read on how to remove the metering arm..........
_________________
1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.

scottc · Posted: Wed May 23, 2007 6:09 am Post subject:

Glad you got it sorted.

Theres a large screw at the back of the metering arm to remove it. Think Haynes has a full description.

PORSCHEV · Posted: Wed May 23, 2007 6:23 am Post subject:

I took it out and cleaned it.... I really expected it to be dirty and gummed up but it was very clean actually. I sanded the piston with 2000 grit paper and blew out the bore.

When I assembled it I lightly lubricated it ( I know the gas will wash it off)...once all assembled it still didn't "fall down" on it's own. I am hoping the fuel pressure drives it back down to the close position.

We'll see after super.
_________________
1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.

scottc · Posted: Wed May 23, 2007 6:31 am Post subject:

When I had mine on the bench, it would naturally fall down. That's where 'it wanted to be' if you know what I mean?

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

ew... I'm pretty sure that any abrasive on that piston is a big no-no. You might want to check into a used fuel dizzy. They can often be scored pretty cheaply.

edit- if it doesn't slide down on its own with gravity, then it's bad/sticking

ps- I believe the piston is brass, which could scratch up pretty easy from any grit paper
_________________
1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

PORSCHEV · Posted: Wed May 23, 2007 6:48 am Post subject:

2000 grit sandpaper... It will barely sand paint off let alone steel. I only used it to clean any light surface gunk.

However you may be right regarding getting another fuel distributor.
_________________
1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.

StienbargerR · Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN

make sure it is centered as well. Mine was slightly off center and it would get caught up a little bit.

Ryan
_________________
1978 924 NA
-250lb lowering springs, Euro Pistons

PORSCHEV · Posted: Wed May 23, 2007 7:25 am Post subject:

Yup..it centered up really well..I was surprised. The psiton seems to work really well. But at the moment the car will just start and run for 2 secs then shut down. Not sure if it's fuel or ignition.. I am sure I'll get it sorted out before the nites out.
_________________
1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11732 Location: PacNW

That sounds like it's running from the CSV charge and then dying. Have you eliminated vacuum leaks?
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

PORSCHEV · Posted: Wed May 23, 2007 7:59 am Post subject:

Got it running....and it runs STRONG. Not a skip, not surge... no ticks..no knocks. Idles exactly at 900 rpm's. Revs up perfectly.

It didn't have power on the positive side of the coil once the key off the "crank" position.

I am so pumped that I got this junkyard ugly duckling running.

Thanks for the help guys.
_________________
1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11732 Location: PacNW

I dare ya to have it detailed.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

PORSCHEV · Posted: Wed May 23, 2007 8:09 am Post subject:

I already have 2 nice cars...this ones to torture and have fun with no worries. You'll be surprised what this car will look like when I am done..and in a short time.
_________________
1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.