Go Back  AudiWorld Forums > Audi Models > Audi A6 / S6 / RS 6 > A6 / S6 (C6 Platform) Discussion
Reload this Page >

S6 V10 engine misfires - low cost solution

A6 / S6 (C6 Platform) Discussion Discussion forum for the C6 Audi A6 produced from 2004-present and Audi S6 produced from 2007-present

S6 V10 engine misfires - low cost solution

 
Old 04-14-2019, 08:20 AM
  #1  
AudiWorld Member
Thread Starter
 
91quattro's Avatar
 
Join Date: Apr 2009
Location: Denver, CO
Posts: 310
Default S6 V10 engine misfires - low cost solution

My 2007 S6 V10 has 106K miles on it. Around 100K, the manifold was removed and carbon cleaned. But recently I started getting misfire codes – on 2 or 3 cylinders. I would clear the codes and they would come back in short order. Cylinders 5, 7 and 8 - so both sides of the block. I talked to my mechanic about it, and he told me about this product called LiquiMoly Valve Clean. He said it was developed by LiquiMoly at Audi’s request, to address an Audi TSB related to this issue. It is a fuel additive that was designed to burn off the carbon buildup on the injector ends. He said it takes just a little carbon on those injectors to cause misfires, but this product was designed to address this problem.

I am normally skeptical of these “snake oil” quick-fix products but I trust my mechanic, so I bought a can of it on Amazon for about $7. I waited until the tank was nearly empty, then put it in and refilled the tank. After about 30 miles, suddenly the CEL light turned off. I ran the codes, and sure enough, no misfires codes. Plus I noticed the engine was running a little smoother. It has now been a few weeks and no misfire codes have returned. I'm a believer!

I wanted to pass along my experience in case anyone out there might be experiencing issues with misfires. Before you spend the money to replace the injectors – try this first.

91quattro is offline  
Old 04-14-2019, 10:09 PM
  #2  
AudiWorld Member
 
Sverige's Avatar
 
Join Date: Jul 2017
Posts: 283
Default

Sounds interesting. I wonder if it’s worth using as a preventative maintenance thing, even before misfires occur.?

i wonder if this is the same stuff?
Liqui Moly Injection Cleaner 300ml
Amazon Amazon

Last edited by Sverige; 04-14-2019 at 10:12 PM.
Sverige is offline  
Old 04-15-2019, 01:53 AM
  #3  
AudiWorld Senior Member
 
Join Date: Sep 2008
Location: Sweden
Posts: 837
Default

Originally Posted by Sverige View Post
Sounds interesting. I wonder if it’s worth using as a preventative maintenance thing, even before misfires occur.?

i wonder if this is the same stuff?
Liqui Moly Injection Cleaner 300ml https://www.amazon.co.uk/dp/B0096Y6O..._XbcTCb5JN5SA3
we can get CRC easier here in Sweden..god product! seem to loosen carbon pretty good when i soaked my divider plates when replacing my nr #5 fuel injector in december
CRC Intake Valve Cleaner
hrc4u is offline  
Old 04-15-2019, 02:04 AM
  #4  
AudiWorld Member
 
Sverige's Avatar
 
Join Date: Jul 2017
Posts: 283
Default

Thanks H, looks like a slightly different type of product - a spray to go into the air intake instead of the gasoline additive the OP mentioned?
Sverige is offline  
Old 04-15-2019, 02:44 AM
  #5  
AudiWorld Senior Member
 
Join Date: Sep 2008
Location: Sweden
Posts: 837
Default

Originally Posted by Sverige View Post
Thanks H, looks like a slightly different type of product - a spray to go into the air intake instead of the gasoline additive the OP mentioned?
Well we have fsi engines soo.. Additive in fuel does not much for valve cleaning.. 👍
/H
hrc4u is offline  
Old 04-15-2019, 03:15 AM
  #6  
AudiWorld Member
Thread Starter
 
91quattro's Avatar
 
Join Date: Apr 2009
Location: Denver, CO
Posts: 310
Default

Injection Cleaner is different....this is specifically for carbon buildup. Agree that most of these can’t do a thorough clean of the valves in FSI engines but this product worked on the injector tips. I am planning to use it once or twice a year as a preventative.
91quattro is offline  
Old 04-16-2019, 02:10 PM
  #7  
AudiWorld Senior Member
 
Join Date: Sep 2008
Location: Sweden
Posts: 837
Default

Originally Posted by Sverige View Post
Thanks H, looks like a slightly different type of product - a spray to go into the air intake instead of the gasoline additive the OP mentioned?
well i fast read the post...haha...saw the bottle and carbon mentioned in post...
well...there is crc valve clean to pour in gas tank also... =) see pic.
i have also used OEM Audi/VW maintenence additive...(when trying to fix my nr 5 misfire) part nr:G00170003
cheers! and happy easter!.. =O)
/H
hrc4u is offline  
Old 04-16-2019, 10:34 PM
  #8  
AudiWorld Member
 
Sverige's Avatar
 
Join Date: Jul 2017
Posts: 283
Default

Thanks H. Happy Easter to you too.

Maybe ill I’ll try one of these “pour into the tank” valve cleaners. Can’t hurt too much anyway, even if it won’t do anything to clean the intake area.
Sverige is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
andysprague
A4 (B5 Platform) Discussion
2
09-22-2008 01:04 PM
Mr Paul [T-28]
A4 (B5 Platform) Discussion
11
12-03-2007 10:49 AM
eigenvector
S4 / RS4 (B5 Platform) Discussion
4
09-11-2006 01:24 PM
HonktheHonkie
A4 (B6 Platform) Discussion
11
07-07-2004 02:15 AM
M3KILR
S4 / RS4 (B5 Platform) Discussion
8
11-18-2003 07:52 PM


Thread Tools
Search this Thread
Quick Reply: S6 V10 engine misfires - low cost solution


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: