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

[yo-cello at comcast.net]

I had the same issue about 5 years back.  It turned out to be one of the spark plugs had backed out.  It was intermittent at first.   

Now I religiously check the torque on the spark plugs along with the oil change.   If that's not the case, then I agree on the POS. 



Paul 


----- Original Message ----- 
From: djdawson2@ aol .com 
To: jc @j2c3.com, bpleet @ telusplanet .net, s-car-list@ audifans .com 
Sent: Monday, December 6, 2010 7:11:33 AM 
Subject: Re: [s-cars] Smooth to Rough to Smooth to Rough 


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

Dave 

  


  

  

-----Original Message----- 
From: JC < jc @j2c3.com> 
To: 'Brian Pleet' < bpleet @ telusplanet .net>; s-car-list <s-car-list@ 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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