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

Bosch Platin Plugs, should I give that a shot to cure IDLE only misfires?

Thread Tools
 
Search this Thread
 
Old 06-29-2008, 11:29 AM
  #1  
AudiWorld Senior Member
Thread Starter
 
AudiSportB5S4's Avatar
 
Join Date: Jul 2007
Location: North East
Posts: 920
Likes: 0
Received 0 Likes on 0 Posts
Default Bosch Platin Plugs, should I give that a shot to cure IDLE only misfires?

So I posted about a week ago an issue with misfiring at idle. My GG Injectors are turned a full 90* each injector, so that's not the issue. I don't have any boost leaks, that's not the issue. When the shop was fixing a big misfiring problem I had back 6 months ago, they did 6 new coilpacks, new STOCK plugs, new coolant temp sensor, ICM's are good... and I only get the misfires @ idle now. So im thinking that the bosch platins may be a good choice now that im full stage 3 and running mucho boosto. what do you guys think? give it a shot ?
Old 06-29-2008, 11:32 AM
  #2  
AudiWorld Senior Member
Thread Starter
 
AudiSportB5S4's Avatar
 
Join Date: Jul 2007
Location: North East
Posts: 920
Likes: 0
Received 0 Likes on 0 Posts
Default DocSlow.. had recomended me checking fuel trims in 032, i was running a bit

rich @ idle, pulled some fuel @ warmup with unisettings, which made it sliiiightly better.
Old 06-29-2008, 11:38 AM
  #3  
Audiworld Junior Member
 
Jenga's Avatar
 
Join Date: Nov 2007
Posts: 190
Likes: 0
Received 0 Likes on 0 Posts
Default

Those plugs did nothing to rectify misfires for me--O2 sensors did.. $3 Autolites worked fine too.
Old 06-29-2008, 11:39 AM
  #4  
AudiWorld Senior Member
Thread Starter
 
AudiSportB5S4's Avatar
 
Join Date: Jul 2007
Location: North East
Posts: 920
Likes: 0
Received 0 Likes on 0 Posts
Default

Oh really, my O2 sensors are new. Did those 6K ago, and in logs you can see their right on par
Old 06-29-2008, 11:41 AM
  #5  
AudiWorld Senior Member
 
slowEURO's Avatar
 
Join Date: Aug 2006
Posts: 1,187
Likes: 0
Received 1 Like on 1 Post
Default

What do you look for in 32 at idle to see that it is rich or lean?
Old 06-29-2008, 12:44 PM
  #6  
AudiWorld Senior Member
Thread Starter
 
AudiSportB5S4's Avatar
 
Join Date: Jul 2007
Location: North East
Posts: 920
Likes: 0
Received 0 Likes on 0 Posts
Default Well, 032 is long term fuel trim. So its like you have to drive for a bit for the numbers to...

car doesnt have to be running to check these, just go to 032, and my numbers were a bit off, they were...

B1 Sensor 1 Adaption Idle...-2.6%
B1 Sensor 1 Adaption Partial...-.5.5%
B2 Sensor 1 Adaption Idle...-3.2%
B2 Sensor 2 Adaption Partial...-5.5%

which is a little rich i guess. LOL i dont know what the ef those mean!
Old 06-29-2008, 12:45 PM
  #7  
AudiWorld Senior Member
 
slowEURO's Avatar
 
Join Date: Aug 2006
Posts: 1,187
Likes: 0
Received 1 Like on 1 Post
Default

True, thanks a lot! I'll look into it further.
Old 06-29-2008, 06:20 PM
  #8  
AudiWorld Super User
 
daves4izzle::ASP 3-'s Avatar
 
Join Date: Jun 2006
Posts: 3,487
Likes: 0
Received 0 Likes on 0 Posts
Default

Negative LTFTs mean you are running rich. Positive means lean.
Old 06-29-2008, 08:47 PM
  #9  
AudiWorld Senior Member
 
slowEURO's Avatar
 
Join Date: Aug 2006
Posts: 1,187
Likes: 0
Received 1 Like on 1 Post
Default

thanks you.
Old 06-30-2008, 08:33 AM
  #10  
AudiWorld Super User
 
Swank4's Avatar
 
Join Date: Aug 2002
Location: San Francisco
Posts: 6,762
Likes: 0
Received 0 Likes on 0 Posts
Default Correction: you are running stoich regardless of the number as long as you are within...

the LTFT limits However, most people think of negative numbers as "running rich" and positive numbers as "running lean".....since negative numbers mean that the ECU is pulling fuel to remain stoich while positive numbers mean the ECU is requesting more fuel to remain stoich.


Quick Reply: Bosch Platin Plugs, should I give that a shot to cure IDLE only misfires?



All times are GMT -8. The time now is 11:27 AM.