TECH: Quantum Syncro/Audi 4000CSQ Engine questions

[quk@sievers.com (Phil Payne)]

In message <199704071747.KAA10349@sled> steveb@falcon.kla.com (Steven Buchholz) writes:

> > I hear that this clicking is common in 10v 5cylinder engines.  I have heard
> > it could be a vacuum leak, cracked or loose exhaust manifold, or 'tappet noise'.
> > The clicking goes up and down with RPM...and does not seem to affect power.
> > The car was pretty peppy.

> 3) broken exhaust studs and a warped manifold.  This would be least likely 
>    IMHO, but you may notice that the noise is much louder when the engine is 
>    cold, and is louder when the engine is accelerating (even when sitting still).

I agree with all Steve's answers, but I'd add that exhaust manifold ticks are 
noticeable by being worse on a _rewarming_ engine - i.e., an engine that has 
been up to operating temperature, has been left for an hour, and is then 
restarted.  The annoying thing about his #2 and #3 is that both can sometimes 
"go away" for random periods.

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club