[s-cars] ping vs. rattle

[Wylie Bean]

I'm stock, and have the same issue. Only seems to have happened since I had the Stromung installed... I was thinking it's the exhaust @ the joint between the front and rear sections?
Wylie Bean
TheRingmeister at triad.rr.com
90 cq
91 90q20v
92 UrS4
08 Q7 3.6
via BlackBerry®

-----Original Message-----
From: james McCarthy <jjssmccarthy at yahoo.com>
Sender: s-car-list-bounces at audifans.com
Date: Tue, 25 Jan 2011 12:37:44 
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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