[s-cars] Pinging woes 95 S6

[Bares, Vittorio]

Thanks for the various responses.

I'm pretty certain this is pinging - I did pull all the plugs - none had damage/pieces missing.

The 02 sensor is fairly low cost (may have one on the shelf) and affects fuel maps. So I'll try that next.

Relaying the fuel pump sounds interesting - and perhaps for a later project - but since this is for light throttle, rather than WOT issue - do you think it is still a possible culprit?

Vittorio -

-----Original Message-----
From: chris chambers [mailto:fastscirocco_2000 at yahoo.com] 
Sent: Friday, July 17, 2009 1:10 PM
To: Bares, Vittorio; s-car-list at audifans.com
Subject: Re: [s-cars] Pinging woes 95 S6

Vittorio,

if the plugs indicate it's running rich let's approach it assuming the sound isn't pinging you
are hearing. What spark plugs are you using? I've read about several instances where the
ceramic on the Bosch plugs became loose and rattled...perhaps you have rattly plugs
that sounds like a pinging noise? You could try swapping plugs to see what happens.


Assuming it isn't running rich I would recommend checking into a fuel pump that can provide 
more fuel...or at least relaying the fuel pump, which you might want to do anyway so link to 
instructions below courtesy Dave and Sean:
http://forums.audiworld.com/showthread.php?p=18754922

HTH
Chris




----- Original Message ----
> From: "Bares, Vittorio" <Vittorio.Bares at nuance.com>
> To: s-car-list at audifans.com
> Sent: Friday, July 17, 2009 12:08:16 PM
> Subject: [s-cars] Pinging woes 95 S6
> 
> The car is a 1995 S6 w/MRC stage 3 (RS2 version) software, RS2 EM, RS2
> style Injectors (37#, slightly higher pressure), RS2 Turbo.
> 
> 
> 
> I've had the car only a few months, all work was done by PO.
> 
> 
> 
> On light throttle, lots of audible pinging - put your foot in it, and at
> least the audible part goes away - pulls like a train. Of course to get
> up to WOT, there are a couple of loud pings - but once boost is full on,
> the pinging goes away.
> 
> 
> 
> Before the weather got warm, it would ping lightly, but now its really
> bad...
> 
> 
> 
> Running 93octane from Sunoco, w/Octane boost (have used a number of
> different brands - all have very little affect)
> 
> 
> 
> Have run a full tank of Techron to help the injectors, if that were the
> problem. (have not changed these out)
> 
> 
> 
> Bob sent me a dumbed down version of the fuel maps and that had zero
> affect, except that the car feels like a dog now, especially since I
> backed the WG spring screw back to stock.
> 
> 
> 
> I can get the car to ping parked in the drive way, by just manipulating
> (blipping) the throttle directly.
> 
> 
> 
> I put a new FPR in - suspecting that. No change.
> 
> 
> 
> I've looked around for ways of testing the TPS - the instructions on SJM
> seem confusing - however, pins 4&6 show infinite continuity at idle,
> make the switch 'click' and it goes to zero resistance. Pins 2&3 show
> between 1000 and 1800 ohms resistance from zero throttle to WOT - these
> seem like pretty weird numbers, and would indicate that I'd have more
> trouble at WOT than at small TP angles...
> 
> 
> 
> Pulled all the plugs, they all look the same - like they were running
> rich !? Although the ceramic under the electrode is a beige color -
> which might indicate some heat?
> 
> 
> 
> While I had the plugs out, I inspected what I could of the top of the
> pistons, they all seemed ok - appeared to have a greenish/gray color,
> but seemed pretty flat and smooth.
> 
> 
> 
> I guess right now, from what I've read the list of potential culprits
> could be:
> 
> -- Temp Sensor (I'm assuming this would be water, not oil)
> 
> -- Air Temp Sensor
> 
> -- Injectors (but why would they be ok at high boost WOT)
> 
> -- Knock Sensors (but why would they be ok at high boost WOT)
> 
> -- TPS
> 
> -- others?
> 
> 
> 
> Before I go buying a whole bunch of new parts I don't really need - I
> thought I would reach out to the list to see what I should do first?
> 
> Vittorio -
> 
> 
> 
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