[V6-12v] Pinking under light throttle

[James Whitehouse]

Hesitation was fixed (it eventually turned out to be a bad O2 sensor, so
both were replaced. No other running problems since then.

There is no EGR on this car.

The timing belt was replaced 20,000 miles ago, but by a non-Audi dealer. I
intend to replace it in the upcoming Head Gasket job, and have both the
required special tools. It's a good thought though. If it's just that, I'll
be a happy man. I have to say though, that even if there were a slight
intake/exhaust timing issue, I would expect pinging to occur at all throttle
positions, and to have shown itself before now. Also, I would still be
concerned at the fact that the knock sensors don't seem to be catching it,
although as you say, it could be that they are but the it's outside the
ECU's correction parameters. If this last is the case, it should throw up
'limit exceeded' fault codes, or similar.

I'll clean the MAF. I'll leave the TB exam and clean til the intake manifold
is off the car for the head gasket job. All intake seals will also be
replaced while that is off the car.

Cheers,
James

> -----Original Message-----
> From: Poncho [mailto:ponchojuan66 at yahoo.com]
> Sent: 02 September 2006 02:56
> To: James Whitehouse; 'Tim Crift'; v6-12v at audifans.com
> Subject: Re: [V6-12v] Pinking under light throttle
> 
> Did you fix the hesitation?  If not you probably still
> have the vacuum leak.. Check EGR.  IT some time
> doesn't throw a code.
> 
> Also , who changed the timing belt last?  Did they use
> the proper tools or swag it.  Sometimes the timing
> belt replacement if not done with the proper alignment
> tools will get the the engine "close" enough to work
> properly.  As things stretch a little the system goes
> a little out of bounds of ECUs ability to totally
> compenate. ping ping. The last time I saw this it
> through a code though.
> 
>  I would clean the EGR, MAF, and TB and check all
> seals.
> 
> poncho
> 
> --- James Whitehouse <james_whitehouse1 at yahoo.co.uk>
> wrote:
> 
> > Tim,
> >
> > Thanks, a good thought. Unlikely in this case though
> > as all the intake air
> > tubes/gaskets were replaced as part of
> > troubleshooting a hesitation problem
> > about a year and a half ago.
> >
> > James
> >
> > > -----Original Message-----
> > > From: v6-12v-bounces at audifans.com
> > [mailto:v6-12v-bounces at audifans.com] On
> > > Behalf Of Tim Crift
> > > Sent: 30 August 2006 15:50
> > > To: v6-12v at audifans.com
> > > Subject: Re: [V6-12v] Pinking under light throttle
> > >
> > > Don't forget that the rubber intake gasket on the
> > throttle body hardens
> > > and causes air gaps over time, effectively leaning
> > out the mixture.  That
> > > was the cause of the pinging on my '95 90Q.
> > >
> > > T
> > > _______________________________________________
> > > V6-12v mailing list
> > > V6-12v at audifans.com
> > > http://www.audifans.com/mailman/listinfo/v6-12v
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> >
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