Exhaust Manifold Rattle - Potential Danger

2.7 V6 30v biturbo - 251bhp
2.7 V6 30v biturbo - 261bhp
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Dr-Al
3rd Gear
Posts: 487
Joined: Sat Jun 10, 2006 11:45 pm
Location: Round the bend

Post by Dr-Al » Thu Aug 17, 2006 8:52 pm

buzzard wrote:does the egt sensor reading show faulty on the half sawn sensor
if so what reading did it give?
me has a noise too!!!
All I can tell you is that there was no DTC code thrown out. I have a cheap chinese VAG-COM lead with the freeware software. I don't think the EGT sensor is one of the channels that the free software can read.

Al.
Wrecked on 9 Oct 2007: 1998 Cactus Green S4, 710N DVs, Boost gauge (in custom A-pillar/dash mounting pod), cruise control retro-fit, Parrot 3200 Colour Hands Free, RS246.com sticker

neckarsulm
Cruising
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Joined: Mon Aug 14, 2006 1:13 pm
Location: The Point

Post by neckarsulm » Thu Nov 16, 2006 10:29 pm

Al,

I get a rattle at idle but can't hear it when driving.
i also have an EGT DTC though noise is coming from offside and EGT fault is nearside.
all set to get it on mechanics ramp for some probing.
Great write-up.
[youtube]https://youtu.be/-I1Ok9LTn6o[/youtube]

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Dr-Al
3rd Gear
Posts: 487
Joined: Sat Jun 10, 2006 11:45 pm
Location: Round the bend

Post by Dr-Al » Fri Nov 17, 2006 1:41 am

I hope it is something other than the manifold. FWIW, mine was not that loud when idling, but if you 'stab' the accelerator, the rattle gets quite loud. Similarly, if you have the windows open, you can hear it every time you put your foot down hard when moving.

As soon as you call for more power with the accelerator, the rattle kicks in. Once the revs stop rising, the rattle fades. It really sounds like bad pinking (pre-ignition/detonation).
Wrecked on 9 Oct 2007: 1998 Cactus Green S4, 710N DVs, Boost gauge (in custom A-pillar/dash mounting pod), cruise control retro-fit, Parrot 3200 Colour Hands Free, RS246.com sticker

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