[s-cars] Smooth to Rough to Smooth to Rough

[djdawson2 at aol.com]

 Yep... good advice from JC.  I'd place my bet on a failing POS as well.

Dave

 


 

 

-----Original Message-----
From: JC <jc at j2c3.com>
To: 'Brian Pleet' <bpleet at telusplanet.net>; s-car-list <s-car-list at audifans.com>
Sent: Mon, Dec 6, 2010 12:45 am
Subject: Re: [s-cars] Smooth to Rough to Smooth to Rough


That's a real good start for a list. Sounds like it's dropping a cylinder

one way or another so ignition followed by fuel.  The big add I'd have would

be a bad POS as the other extremely common known failure and if a POS

channel has completely crapped out then this is exactly the kind of thing

you'd get.



But start here:



If it is running badly consistently that's actually 'great', especially if

it happens at idle.  That means you can let it idle in the drive while you

disconnect one injector at a time. If runs worse when you unplug the

injector, then that cylinder is not the problem. When you pull an injector

wire and nothing changes you've found your non-firing cylinder and you can

start to zero in on ignition and fuel for that one. If all injectors are the

same (aka make it run worse), then it is a "system wide" problem like fuel

or air.



Have fun and good luck!



JC



>

> Fuel supply problem

> cracked coil pack

> cracked spark plug

> broken ignition lead

>

> Suggestions welcome before his timer starts ticking.

>

> Brian

>





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