[urq] Rattle at higher rpm

[Brandon Rogers]

I will check heat shields for sure - my center resonator has been
removed, and I'm running a test pipe.

Thx!

Brandon

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On
Behalf Of urq
Sent: Monday, September 17, 2007 10:56 PM
To: urq at audifans.com
Subject: Re: [urq] Rattle at higher rpm


... if it could be coming from underneath the car I'd recommend the
center muffler ... the center muffler on my car makes a very similar
sounding noise at high revs.  There is some internal baffle that is
loose inside.  I'd also think about a cat heat shield, but you say
that's already been swapped.

Steve B
San José, CA (USA)

-----Original Message-----

> For years I've had this annoying, fairly loud rattle - like a loose 
> bolt or something, when I'm driving and the motor revs to about 4000+ 
> and I shift.  This rattle has survived a motor swap and a cat swap.  
> It's definitely metal on metal and goes away as revs fall.  And it 
> does not happen until the engine is warm/hot.  I'm thinking I need to 
> get the engine hot, put the car up on ramps and carefull crawl under 
> there (a little bit) and have somebody rev the motor.  Any other 
> thoughts??? Obvious places to look for something loose?  Maybe an odd 
> bolt on the tranny?  Any BTDT?
>  
> TIA-
>  
> Brandon
> '84 ur

I too had a similar noise/problem (but temperature didn't matter). The
noise was really annoying, and really made the car feel 'wrong' when
revving.

I couldn't find the problem until I pulled the head off to fix a blown
head gasket.

Seems as thought the starter heat shield had partially rotted away, and
as reves rose, it must have vibrated more. When I had the head off, I
repaired the heat shield, and after the motor seemd WAY smoother when
revved up. I never realized that was what was causing the problem, until
I tried out the car after the repairs. A 'bonus fix' as it were!

Could be some slack in the bolts the hold the downpipe to the
exhaust/cat too, I suppose...

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