Fw: [V6-12v] all quiet on the AUDI Front

[clive young]

----- Original Message ----- 
From: "clive young" <cyoung1661 at rogers.com>
To: <James4ihl at aol.com>
Sent: Monday, March 22, 2004 8:57 PM
Subject: Re: [V6-12v] all quiet on the AUDI Front


> James
>
> This is a "good bug" but for you I am sure it is frustrating. I don't have
> an answer but maybe a few more questions might stimulate a some discusion.
> Does the hesitation only hapen under load or will it do it in neutral if
you
> slowly accellerate. ? Usually "load type problems are caused by electrical
> probelems like , plugs, wires, ignition modules, etc, how about even a bad
> fuel pump hesitating or something? . I personally think it will be
something
> primary like this. I know the hall sender ( cam position sensor  )
monitors
> the cams and controls injector timing. It causes performance issues when
it
> goes bad, but that would throw a code for sure.
>
> Can you not monitor real time with a OBD2 analyzer ? I know you can with
> obd3. If you can with OBD2 it would be worth finding someone to do it to
> give you a snap shot of what is going on during your hesitation.
>
> Funny thing is my motorcycle is doing exactly what your car is . I have a
> new set of points and condensors, and a set of carbs, because I just can't
> tell if it is fuel or spark ..... i am waiting till it gets warmer.
>
> Any one else have any ideas ?
>
> Clive
> ----- Original Message ----- 
> From: <James4ihl at aol.com>
> To: <v6-12v at www.audifans.com>
> Sent: Monday, March 22, 2004 6:04 PM
> Subject: Re: [V6-12v] all quiet on the AUDI Front
>
>
> > Well,
> >
> > Since we've been asked for problems since its 'too quiet' out there...
get
> > your teeth into this one guys:
> >
> > Yep, you guessed it. Its the old hesitation problem again!!!
> >
> > Here's what's changed since I last asked your collective wisdom about
the
> > problem:
> >
> > 1. Car was taken to Audi shop and hooked up to diagnostic computer. No
> faults
> > stored in permanent memory.
> > 2. Audi tech told me they had found nothing except (sic.) an
'intermittent
> > non-signal from one lambda (O2) sensor. I said - "Well, don't you think
> the
> > cause of my intermittent hesitation could be an intermittent
non-signal?"
> "Well,
> > maybe," he said, "but we usually replace the Coolant Temp Sender first
> because
> > they're usually the only thing that can go without leaving a permanent
> fault
> > code."
> > 3. So I replaced the coolant temp sender today. Result? Still hesitates.
> Oh,
> > and now I have a noisy hydraulic lifter too, despite the procedure going
> > nowhere near the rocker covers :)
> >
> > If I don't diagnose this soon, I'm gonna go nuts, I swear!! So, please,
> any
> > good ideas? Could you:
> >
> > 1. Think of anything that could be causing this, electrical, or
> mechanical.
> > 2. Think about this: when the hesitation occurs, its generally on
> > accelleration. If you try to 'accellerate through' the hesitation (i.e.
> pressing harder
> > on the throttle) the car will stay at the same revs for as long as it
> decides
> > to, then suddenly jump to correct revs for that throttle position. If,
on
> the
> > other hand, you back off the throttle a little way when it hesitates, it
> will
> > 'clear' (for want of a better term and let you accellerate smoothly
again.
> Now
> > what could cause that?
> > 3. Tell me how to do the following:
> > a) if my manual tells me to 'check for an open circuit between connector
X
> > and connector Y, what setting do I use on a multimeter? Resistance?
> Voltage? If
> > resistance, what kind of reading would be good and bad for an open
> circuit?
> > b) if my manual tells me to check for a short circuit, same question as
> > above...
> > c) if my manual says to check for an earth fault between connector X and
> > 'engine earth', same question again...
> > d) does anyone have a procedure, or any warnings, about disconnecting
the
> > multi-pin connectors to the ECU in order to test the wiring between the
> > connectors in the engine bay and the multi-pins in there? Also how does
> one check the
> > continuity - do you need a multi meter with bloody great long leads, or
is
> > there a way of extending them reliably?
> >
> > Please help, I'm really fed up with this damn problem now!
> >
> > Cheers :)
> > James
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>