Re: [8v,JH] control-pressure regulator vacuum connections

["Ewan Hopkins" <ewanhopkins@hotmail.com>]

The warm-up regulator with vacuum enrichment came on the I5 & I4 16v 
engines, and maybe on some audi I4 applications.  Sounds like you've got one 
off an early to mid '80s audi or passat.

Since you don't have the enrichment circuit connected-up, the critical 
factor, in your case, will be the basic control pressure range of the 
regulator:  if it is too low for your fuel distributor then you'll get too 
much fuel flowing and a rich mixture. If you should have the vacuum 
connector hooked up then you'll be running lean, if anything, rather than 
rich.  It's worth checking the electrical connection to the regulator 
(supplies heater in the regulator, I think) and whether the circuit in the 
regulator is good, as I've found that if I disconnect mine, it doesn't run 
very well.  If that's OK, take your car to someone with a fuel presssure 
gauge and see if the control pressure & main system pressure is within spec.

There are several applications where the cap is fitted as stock. The 8v 
scirocco should just have a standard regulator, with no vacuum connector. 
For the JH engine the p/n is 063 133 403, the euro version is 043 133 403.
An I5 version (audi or passat)with cap is 034 133 403 or 035 133 403.
I am running with one off an audi 2.2 and the vacuum connection is to a 
takeoff on the inlet manifold.  I do, however, have an audi 2L rather than 
the original 1.8, using the original 1.8 fuel meter.

HTH,

Ewan Hopkins
'85 2.0 Storm



>From: Oliver Seiler <oseiler@acm.org>
>To: Scirocco Mailing List <scirocco-l@scirocco.org>
>Subject: [8v,JH] control-pressure regulator vacuum connections
>Date: Mon, 28 Feb 2000 22:23:56 -0800 (PST)
>
>Hi all,
>
>I was looking at my control-pressure regulator (warm-up regulator) today
>and noticed that it appears to have a vacuum connection on it, but no
>vacuum hose connected (it has a plastic cap over, looking suspiciously
>like what I'd expect a new one out of the box to have.
>
>For those of you who have the Bentley Bosch Fuel Injection book (by
>Probst) it actually looks like the one in fig 5-4 on page 6-16, which
>apparently has full-load enrichment (through the vacuum connection) and
>altitude compensation.
>
>Anyway, I'm not sure if these are stock on an '86 8V, but I'm pretty
>suspicious about that unconnected hose connection. Based on my
>understanding of it, this could be the cause of my poor mileage, poor
>idle, rich mixture, etc. Anyone else have one of these on their car and if
>so, where is the vacuum hose connected to?
>
>Thanks,
>Oliver
>
>Oliver Seiler -- Software Developer, Pivotal Software, 
>http://www.pivotal.com
>     Scirocco MkII Diary - http://erisian.com/~oseiler/scirocco/index.html
>
>
>--
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