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Probably not, unless the oring that seals the fuel head to the air metering unit was torn or pinched.
Take all 3 screws out and wiggle the fuel head upwards to see the o-ring.
That o-ring slides down in a hole and should have a little smear of grease on it to lubricate it when installing.

Old 12-23-2008, 08:37 AM
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930s rule the wasteland
 
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ok I'll check it out, is it axle grease or some special type?
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-23-2008, 09:09 AM
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Doesn't matter on that one.
It's not a silicone o-ring so you don't have to worry about petroleum grease possibly making it swell up.
It's just a plain old skinny black one about an inch and a half in diameter.
I used synthetic wheel bearing grease on mine because some was nearby. Any grease would work.

Silicone o-ring lube like pool guys always have for pool pumps or dow corning silicone o-ring lube would be best on most o-rings, but I wouldn't go buy it just for that one.
When you see how that skinny o-ring is installed you'll see why a little grease or oil on it helps it slide in place without dragging and tearing or pinching.
Old 12-23-2008, 10:32 AM
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ok installed injector blocks and gaskets, rebuilt fuel head ,replaced fuel filter(which was pretty plugged) bled fuel system. fired car up ran ok but started to lean out headers and turbo got cherry hot. shut down and let cool down for a few minutes and then started up again just to circulated some oil in the turbo.where do i go from here? get a/f ratio reset?
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1980 930 Turbo
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1984 944
2001 VW golf TDI
Old 01-14-2009, 06:17 PM
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Definately check that you are flowing enough fuel. Did the rebuilder mention any fuel head running in or is it good to go out of the box?

I would definately check the control pressures and mixtures. You might find the old head was letting more fuel through than the rebuilt head. Either way red hot turbo and exhaust at idle is not good!

Keep me posted h20!! You're nearly there
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'85 930 - Black on Black
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Old 01-14-2009, 07:44 PM
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Remove your gas cap to see if a vacuum is building up in your tank when it leans out. If it is, the evaporitive emissions stuff is clogged.
You could use a wideband air fuel ratio gauge like Innovate to see whats going on, check all vacuum lines, o-rings, and check ignition timing.
Old 01-14-2009, 08:40 PM
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Thanks for the encouragement, Jaytan did the rebuild on the head and didnt mention anything other than resetting mixture and what other problems it could be. Is there some kind of break in period? Leask did the rebuild on WUR back to stock specs(and fully adjustable) Should I still recheck base pressures? And can I tune everthing w/ the Inovate system? base co and idle adjustments? Again thanks for all the info its better than just giving up and drinking. Pete
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1980 930 Turbo
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Old 01-15-2009, 05:22 AM
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Check the fuel distributor plunger for gum-out that affect the plunger free movement. It could be getting stuck at a point (i.e. 2K ~ 3K rpms) and then releases (back to normal) under suction. I had a similar experience years ago with "bad" fuel; cleaned the fuel distributor and back to normal.
Old 01-15-2009, 07:20 AM
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Innovate system on the way are these straight forward to hook up? Went with the DB series.
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1984 944
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Old 01-15-2009, 09:23 AM
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Old school on ordinary engine would be ignition timing. Cherry red exhaust indicates too retarded.

Diverdan
Old 01-16-2009, 07:11 AM
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Im gonna remove the air cleaner and check for a disconnected hose to emission add on when car came to this country.(ROW car and I think this is some purge solenoid) I'll post pics, sucks cause theres not a lot of info on what they put on the car when it hit the states!I'll also check timing too Dan. crap while im at it im gonna check baswe fuel pressures too. might be some time next week, I have a r/r engine job to try to pay for this addiction before i can get to it.
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1980 930 Turbo
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1983 944
1984 944
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Old 01-16-2009, 08:22 AM
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1980 930 Turbo
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1984 944
2001 VW golf TDI
Old 01-16-2009, 08:24 AM
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Your re-build, set-up etc.. should have been pretty straight forward as you suggested.

See a couple of non-factory items in your pic.. why are you keeping the emission add on stuff?
Why not identify the add-ons and strip it back to ROW specs?

If you decide you want somebody to take a look at it try Charlie over at Intersport in Tysons.. right up the street from HBL.
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Old 01-16-2009, 10:33 AM
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would a vacum leak cause the distributor to retard?
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1983 944
1984 944
2001 VW golf TDI
Old 01-16-2009, 11:51 AM
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Onboost do you have a link or phone # cant find in yellow pages

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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 01-16-2009, 12:16 PM
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