AudiWorld Forums

S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Misfiring at full boost - need new spark plugs?

Thread Tools
 
Search this Thread
 
Old 02-22-2005, 08:31 AM
  #1  
AudiWorld Super User
Thread Starter
 
Kyle K: TampaS4's Avatar
 
Join Date: Aug 2000
Posts: 2,720
Likes: 0
Received 0 Likes on 0 Posts
Default Misfiring at full boost - need new spark plugs?
At 21psi(full throttle) the car would misfire so much the CEL came on and flashed at me for 30 seconds before shutting off after driving normal again. I had since lowered my boost down to a super safe 13psi. And the car runs great(in a slow kind of way). Could i possibly need new plugs? what could cause this activity only at higher boost? Thanks for your help.
Kyle K: TampaS4 is offline  
Reply Like
Old 02-22-2005, 08:39 AM
  #2  
AudiWorld Super User
 
The R's Avatar
 
Join Date: Mar 2000
Posts: 9,705
Likes: 0
Received 0 Likes on 0 Posts
Default
What plugs are you currently using?
The R is offline  
Reply Like
Old 02-22-2005, 08:43 AM
  #3  
Member
 
S4orce2001's Avatar
 
Join Date: Feb 2002
Posts: 4,875
Likes: 0
Received 0 Likes on 0 Posts
Default
hey ill see you in april at the drag stripe. LOL vwfixxx
S4orce2001 is offline  
Reply Like
Old 02-22-2005, 08:46 AM
  #4  
AudiWorld Super User
 
AJN334's Avatar
 
Join Date: Aug 2004
Posts: 5,136
Likes: 0
Received 0 Likes on 0 Posts
Default
Sorry for the n00b, but how do you know if your car is misfiring?
AJN334 is offline  
Reply Like
Old 02-22-2005, 08:48 AM
  #5  
Member
 
AudiS4guy - NorCal's Avatar
 
Join Date: Aug 2004
Posts: 3,258
Likes: 0
Received 0 Likes on 0 Posts
Default sparks plugs or coilpacks. Log to see which cylinders and swap with another cyl. also
could be the spark plug boot as well, measure resistance with ohm meter (should be around 2k IIRC)
AudiS4guy - NorCal is offline  
Reply Like
Old 02-22-2005, 08:56 AM
  #6  
AudiWorld Super User
 
EdyJun's Avatar
 
Join Date: Dec 2002
Posts: 2,718
Likes: 0
Received 0 Likes on 0 Posts
Default
What block do you log for misfire @ WOT?
EdyJun is offline  
Reply Like
Old 02-22-2005, 09:03 AM
  #7  
AudiWorld Super User
Thread Starter
 
Kyle K: TampaS4's Avatar
 
Join Date: Aug 2000
Posts: 2,720
Likes: 0
Received 0 Likes on 0 Posts
Default
Bosch platins. They're a tad old. i just wanted to be sure this is the problem
Kyle K: TampaS4 is offline  
Reply Like

Trending Topics

Old 02-22-2005, 09:04 AM
  #8  
AudiWorld Super User
Thread Starter
 
Kyle K: TampaS4's Avatar
 
Join Date: Aug 2000
Posts: 2,720
Likes: 0
Received 0 Likes on 0 Posts
Default
shows up as a fault code in the VAG-COM
Kyle K: TampaS4 is offline  
Reply Like
Old 02-22-2005, 09:05 AM
  #9  
AudiWorld Super User
Thread Starter
 
Kyle K: TampaS4's Avatar
 
Join Date: Aug 2000
Posts: 2,720
Likes: 0
Received 0 Likes on 0 Posts
Default If i had an OHM meter or knew how to use one that would be great.
the fault codes showed random multiples for all cylinders and another code showed multiples for cylinder 4.
Kyle K: TampaS4 is offline  
Reply Like
Old 02-22-2005, 09:06 AM
  #10  
AudiWorld Super User
 
lemieux@curbside's Avatar
 
Join Date: Dec 2002
Posts: 17,772
Likes: 0
Received 0 Likes on 0 Posts
Default
why not swap them first and go from there ... should have done it by now.
lemieux@curbside is offline  
Reply Like



Advanced Search
Quick Reply: Misfiring at full boost - need new spark plugs?


Reply Closed Thread Share

All times are GMT -8. The time now is 09:52 PM.