I've problem with my twin 40 DCNF turbo !

1. How to replace the timing belt and water pump on your VW ...

   ? 12:12
   www.youtube.com/watch?v=OQ7lbkid5gA Oct 14, 2011 - Uploaded by briansmobile1 How to replace the timing belt and water pump on your VWBeetle Golf ..... do not install the plastic impeller ...

VW what car?
what year>?
no model, no year,
no joy.
are these custom carbs? if yes, NO ONE CAN answer that.
because.
Jets are tuned for YOUR engine alone.
if all this is true,then get the weber book, huh? and read it.
it tells you how to tune any weber, and its not simple. not at all
the webers are the most difficult to tune but on the other hand they are the best. (less compromise , makes great racing carbs).
there are on line weber tunning pages, why not google that.

in the old days, we'd use spark plug readings for full week end (wasted ) to tune any custom carb,,

fast forward, 21st century, we have nice wide bad 0xy sensor tool.
its about, $150 now.
we put a 02 exhaust bug on the exhaust headers, (both if v8)
and we tune the carb. using this tool , in about 1hour.
way less for only idle , idle is very simple NO ENGINE LOAD.
I set it to stoich and drive.
end story, unless , issues driving or up hills.

on stock carbs the idle has a mixture screw.
we set it to max RPM and the unscrew 1/2 turn (rich)
not all carbs some use an air screw. (backwards)
contrats, the most complex question ever asked on fixya.
ever.
join a car forum for your car, then find custom carb section
then ask there. bingo,, must maybe 1 other person did this.
but i can tell you if the engine is different , with custom exhaust
all the tuning must be done over.
eg: custom cam, milled heads, exhaust, bored cylinders. or ported inakes. all change DEMAND for fuel and must be tuned to match it.
same is true with EFI. (speed density) but not air density EFI.
see.... ?

Best place to start is eBay vw turbos can range from $250.00 to $700.00 but it depends on your model and engine size. You can look up vw golf websites and I believe you can even by them cheaper through club web sites

Hi, Lee,
you have lose earth connection somewhere.It is difficult to find.Can be anywhere.

sell it buy a real car

Change the fuel filter,the filter is block with dirt .

1990 VW Golf 1.8L 8 or 16 valves.
step # 1 29 ft/lbs
step # 2 44 ft/lbs
step # 3 turn bolts 180deg. further in one continuous movement, two separate 90deg. turns may be used.

I would start with changing the fuel filter, with the tow truck that work on every day, I service them every two weeks, and the fuel filters come back full of grim the deisel fuel filters have to get changed more often with the fuel going around, try and stay away from pride gas stations, they have caused 8,000 in repairs to my trucks.

chances are your turbo pipe has come off near the back of your drivers side headlamp, where it gos into the inner wing to the intercooler. hope this helps

sounds like the fuel pickup in the tank is no good it controls the fuel gauge.