[urq] something's a-miss

[Ingo Rautenberg]

----- Original Message ----- 
From: "spot.ontheroad" <spot.ontheroad at virgin.net>
To: "Gary Brown" <gmbchef at comcast.net>; <urq at audifans.com>
Sent: Wednesday, October 06, 2004 4:26 AM
Subject: Re: [urq] something's a-miss


> I recognise the "blehhhh" (and that is how you spell it). I recently had
to
> have my fuel tank repaired, I dried it out and refitted it. All was fine.
> Then it started to miss occasionally, usually at higher revs. Then it
> started to happen more frequently and at gradually lower revs. The miss
was
> instant and short duration and felt very "electrical".Then the duration of
> the miss got longer hence the "blehhhh".  We tested everything electrical.
> Then with further road testing we noticed that the air/fuel meter showed a
> sudden weakening of mixture just before the miss. If it had been
electrical
> the mixture would have richened. So now we knew it was fuel. I
disconnected
> the tank outlet and the fuel struggeled to drain out. A blast up the pipe
> with compressed air led to a blob of gel-like emulsion dropping out
followed
> by a full flow of fuel. I flushed the tank through repeatedly with a few
> gallons (filtering it each time) and put it all back together. It has been
> fine since....


Which reminds me of another thing I recently encountered before I ripped the
IC to TB hose on my Urq:

I guess this does sound kinda like "blehhhh".  It was not constant, but did
get worse, like the engine was choking -- first at around 4K (but only under
hard accel) then progressively lower RPM.  Turned out to be corrosion at the
positive lead for the fuel pump.  I had already done the FP relay mod -- but
if the connection isn't good at the fuel pump, it really won't help.
Anyhow, changed that and  replaced the ignition coil with MSD Blaster coil
and all is well.  Unlike the later cars, the CIS ones are much more finicky
when it comes to fuel pressure and they need lots of it.  HTH

-Ingo
'91 200q20v...Slightly modified
'84 Urquattro
'91 v8q 5-speed w/ lots of mods :-)
'91 v8q Auto
http://hometown.aol.com/quattringo/index.html



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