[s-cars] Knock Sensor

[Walsh, Edward]

New...



-----Original Message-----
From: serge [mailto:serge411 at speakeasy.org]
Sent: Tuesday, July 15, 2003 2:01 PM
To: Walsh, Edward; 'Sean Douglas'; s-car-list at audifans.com
Subject: Re: [s-cars] Knock Sensor


Fuel filter?



> Thanks Sean,
>
> I found the 2 KS last night (talk about a needle in a shitstack) was
hoping
> that one was loose (rattling causing "noise") but both were tight.
>
> Pulled codes again and got a 2413 "Mixture adjustment - Fuel system
pressure
> too low.  Spark plugs, ignition coils, POS malfunctioning.  Leakage in
> exhaust system before cats.  Incorrect signal for MAF"
>
> Now, I know my plugs, coils and POS are good.  There is no leak in the
> exhaust and the MAF is OK.... So that leaves fuel system pressure too low.
> Makes a little sense as the car is flawless at <16 PSI, it only surges at
> high boost.  That said, the surges/misses don't seem violent as I would
> associate with fuel starvation.  But the surges are sometimes very
> noticeable (like the engine "cleared its throat") and other times just
> perceptible on the boost gauge (though the isn't as fast as it should be).
> Again, at anything < than 16psi, the car engine is perfect.
>
> Could a bad FPR cause low fuel pressure?  Rod, I mean Bill, please send me
> your old FPR.  Thanks :)
>
> Regards,
>
> Ed
>
>
>
> -----Original Message-----
> From: Sean Douglas [mailto:quattro20v at telus.net]
> Sent: Tuesday, July 15, 2003 12:38 AM
> To: Walsh, Edward; s-car-list at audifans.com
> Subject: RE: [s-cars] Knock Sensor
>
>
> From Bentley:
>
> "The knock sensors cannot be checked electrically. Check DTC memory
> Page 01-11 . For satisfactory function of the knock sensors, exact
> compliance with the tightening torque of 20 Nm (15 ft lb) is important.
> Check the harness connection from knock sensor to wiring harness for
> corrosion."
>
> Since you have no codes, I'd check the torque values of your KS.
>
> Sean
>
>
>
> -----Original Message-----
> From: s-car-list-admin at audifans.com
> [mailto:s-car-list-admin at audifans.com] On Behalf Of Walsh, Edward
> Sent: Monday, July 14, 2003 11:49 AM
> To: 's-car-list at audifans.com'
> Subject: [s-cars] Knock Sensor
>
>
> Still having the same high boost problems with my MTM 1+ eq. Avant.
> (erratic WOT boost that fluctuates between 18-21 PSI in top gears,
> definite lack of punch, surging)
>
> Everything has tested OK so far (Coils, plugs, connectors, POS, MAF, New
> O2, New Fuel Filter, No hose leaks, BPV OK, Turbo good, etc.).  Then it
> dawned on me that I haven't considered the knock sensor(s?).  Could a
> failed KS cause the wacky boost issues?  Can a KS be tested, or is it
> just replaced? Engine throws no codes...
>
> Thank you loyal listeners - Ed
>
>
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