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4kq 4000rpm cutout
In message <c=US%a=_%p=COTL%l=COTL-IT-1-971120154655Zfirstname.lastname@example.org> "Perry, Christopher" writes:
> I had a similar problem with a 4ks which turned out to be a small filter
> INSIDE the bolt that holds the fuel line to the FI metering head. This
> is supposed to be removed by the dealer after 1k miles or so and is
> intended to catch material left over from the manufacturing process.
I'm really not sure _what_ these bolts are for. I've now found four installed
in ur-quattros, after examining around thirty cars.
There are (at least) two different designs. Both have hex heads instead of the
more usual 10mm Allen heads. One has a single 'banjo/banto' hole on the side
with a coarse white plastic screen on it, and has a comparatively small hole to
feed fuel into the metering head. At first, I thought they were performance
limiters intended to protect the engine during shipping (have you ever watched
the drivers who load/unload ro-ro car ferries?) and to catch rubbish left in
Then I found the second type. This has two larger banjo/banto holes and a
normal sized feed into the metering head - but it has a much finer and larger
conical screen inside the bolt, compared with the coarse screen on the first
I also surmised that these things might be the 'constriction' mentioned in
Probst's book. So I cleaned one of them (first type) and put it in my car. No
detectable difference in performance.
I can't find any part numbers for these things, BTW.
Committee Member, UK Audi [ur-]quattro Owners Club