[s-cars] ping vs. rattle

[Ian Duff]

If it happens while stationary, the old screwdriver stethoscope should help locating it. If it's a detonation ping, the stethoscope will locate it near the head, no?

Best regards, Meilleures salutations, 此致敬礼, Mit freundlichen Grüßen, 
  Con i migliori saluti, مع أطيب التحيات, Saludos cordiales, के साथ सबसे अच्छा संबंध है,
  A melhor consideraçāo, によろしく

-Ian.

Ian Duff | 38 Grove Street | New Bedford | Massachusetts | 02740 | USA
V: +1 (508) 717-8058 | E: ian at inside-overlap.com | F: +1 (801) 335-1661

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On 26 Jan, 2011, at 10:12, Wylie Bean wrote:

> I don't think he ever said it happened @ idle... Only that he could make it happen with the car stationary as well as in motion.  The way I read it, it happens btwn 2800-3100rpm, not @ idle.
> 
> Wylie Bean
> TheRingmeister at triad.rr.com
> 90 cq
> 91 90q20v
> 92 UrS4
> 08 Q7 3.6
> via BlackBerry®
> 
> -----Original Message-----
> From: "Phil Mische" <pmische at att.net>
> Sender: s-car-list-bounces at audifans.com
> Date: Wed, 26 Jan 2011 09:53:21 
> To: 'james McCarthy'<jjssmccarthy at yahoo.com>; <s-car-list at audifans.com>
> Subject: Re: [s-cars] ping vs. rattle
> 
> Detonation only occurs when the air-fuel mixture spontaneously combusts well
> in advance of when it's supposed to - it only happens under load.  Therefore
> if it's making the noise with no load (at idle) it's a rattle, not pinging.
> 
> 
> 
> 
> If there was fuel starvation (kinked hose) it would ping like mad at WOT.
> 
> 
> 
> PJM
> 
> 
> 
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of james McCarthy
> Sent: Tuesday, January 25, 2011 3:38 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] ping vs. rattle
> 
> 
> 
> Need the wisdom of the group.
> 
> So I'm starting to think I'm getting some pinging since replacing my fuel
> pump (used a bosch OEM unit)... old pump was replaced as precaution 2 months
> ago currently running RS2 turbo, MAF, injectors, EM and IA software. Not
> 100% convinced it started right after the pump swap but definitely not there
> before.
> 
> Here are the symptoms -
> At approximately 2800-3100 with moderate tip in of the throttle I get a loud
> rattle (machine gun/ rattle snake) that I can sustain but starts to fade if
> I hold it. Can also get to to occur at higher RPM but with less consistency.
> Rarely hear it with WOT...
> 
> Can get it to occur with the car stationary in neutral (clutch in) but much
> less severe (quieter).
> 
> 
> No change in Peak boost smooth throttle with no hesitation even with WOT.
> 
> So I feel like I might have have had occasional backfire when letting of the
> throttle complete and quickly after WOT (but that would be a symptom of
> running rich correct???
> 
> No exhaust problems I can see (stroumng unit) BPV is forge unit and holds
> vacuum. I actually pulled the cat/ center section off this weekend - no
> rattle and the cat is perfect.
> 
> So I'm wondering of the "new unit" is a bit anemic??? - consider replacement
> - but why would this come up now - running the same setup for 2 years (no
> previous pinging).
> 
> If I go with the 005 or 044 - is the noise going to make me nuts?
> 
> Will dive back into the tank to make sure hose isn't kinked somehow...
> 
> No codes.
> 
> Any other thoughts?
> 
> 
> 
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