Re: s4 rough acceleration

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <D18959B88F0ED111B5F500A0C97080E7658E66@midp-exch-005.aetna.com> "Martin, Gary G" writes:

> I have a 94 s4, bought at 87k,nearing 100k now and seems to have developed a
> roughness during acceleration.
> Most noticeable at 3000 to 4500 rpm at half to full throttle in second gear.

This might be 'Adam Marsden Syndrome', named for the proprietor of AM
Cars who first described it to me when I told him the symptoms on my
car.  On my engine, there's a metal section in the crankcase breather
pipe where it reaches the top of the engine and curves over the cam
cover to meet the multi-way hose junction on top of the engine.  During
accleration in second gear, G-force is strong enough to push this pipe
back onto the top of #5 plug - effectively shorting out the plug wire.

The solution was to cable-tie the metal hose section to the plug cable
shroud.  This trick has helped quite a few people.

Of course, there's always the standard possibility that it's the
multi-way hose junction itself - they crack, underneath.

And check the chassis grounds to the engine ...

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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