Q5 FSI Carbon Build-up - Page 35 - AudiWorld Forums

Notices
Q5/SQ5 MKI (8R) Discussion Discussion forum for the First Generation Audi Q5 SUV produced from 2008 to 2017
Old 07-25-2016, 04:16 PM
How-Tos on this Topic
Last edit by: IB Advertising
See related guides and technical advice from our community experts:Browse all: Audi Q5 or Q7 Specifications & General Maintenance
Print Wikipost

Q5 FSI Carbon Build-up

Reply

 
 
Old 01-07-2016, 08:58 AM
  #341
AudiWorld Super User
 
ELEVENS's Avatar
 
Join Date: Jun 2006
Location: great lakes, yoo ess of eh
Posts: 4,596
Default

Similarly, Lexus and Acura engineers seem good at designing brand new SUVs that drive like yachts

Just to be sure: I'm not defending Audi on this carbon issue, that's for sure! I got two free carbon cleanings from Audi then dumped the Q5 before the next one was on my dime. This spring, my RS4 will get it's 4th carbon cleaning (intake valves and intake runners in the cylinder heads). Only 60K miles on the car. It takes me about 12 hours to clean, but it's worth about 25HP, so on a performance car - it's worth it (to me).
ELEVENS is offline  
Reply With Quote
Old 01-07-2016, 09:19 AM
  #342
AudiWorld Super User
 
Join Date: Mar 2000
Location: US PA
Posts: 4,845
Default

Originally Posted by ELEVENS View Post
Similarly, Lexus and Acura engineers seem good at designing brand new SUVs that drive like yachts

Just to be sure: I'm not defending Audi on this carbon issue, that's for sure! I got two free carbon cleanings from Audi then dumped the Q5 before the next one was on my dime. This spring, my RS4 will get it's 4th carbon cleaning (intake valves and intake runners in the cylinder heads). Only 60K miles on the car. It takes me about 12 hours to clean, but it's worth about 25HP, so on a performance car - it's worth it (to me).
So on your RS4 you need to have the carbon cleaned about every 15K miles and I'm sure you don't drive the RS4 like an old lady as most Q5 owners do. This is just terrible for Audi engineering!!!! My 2014 Q5 2.0T has the extra non-direct 5th fuel injector in the intake manifold so hopefully this will aid in some carbon removal by the slight fuel flushing of the valves .

What it the cost of carbon removal on a 3.2 when you are not covered by warranty?

Last edited by Bob Petruska; 01-09-2016 at 07:23 PM.
Bob Petruska is online now  
Reply With Quote
Old 01-09-2016, 07:05 PM
  #343
AudiWorld Member
 
Join Date: Oct 2014
Location: Texas
Posts: 180
Default

Originally Posted by mpurewal View Post
My Q5:
- 2010 Q5 3.2 FSI, 34k, picked up in June 2009
- Maintained by Audi (Audi care)
- Fuel - 99% of the time Shell 91 octane
- Typically drive around the city plus some highway - in S mode at times

Issues:
- Rough idling/shudder about 2 months ago
- 2-3 tries before the car would start (usually twice a week). Over the last 3 weeks.
- Check engine light on for about a day (2 days ago)

So of course I came to the AudiWorld and other Audi forums (the Audi community is awesome ) which led me to believe this might be a carbon buildup problem based on the symptoms. I took it to my Audi dealer yesterday (Toronto area) and they confirmed that this is a carbon buildup problem. They'll be keeping my car for a few days and replacing the injectors under warranty - very decent dealer btw, always look into and fix any issues I bring to them - of course it helps that I'm always right

For those interested here's a summary of the information I've collected....

Issue - Direct injection engines such as FSI get carbon buildup on the valves and injectors because there is no fuel passing over them as it does for other engine designs - so no cleaning. This leads to misfires, loss of HP (substantial) and potentially other issues for the engine.

Turbo engines - 3.0 T (supercharged) and 2.0T seem to suffer a lot less from the carbon buildup issue, possibly due to higher engine temps in the manifold which burns off the carbon deposits.

What doesn't seem to work to prevent this:
- Catch cans don't have much effect (don't know the technical details are but something to do with the "gunk" coming out of the engine which isn't prevented by the catch can)
- Frequent oil changes
- Fuel additives (the additives never make it out to the valves so they have no effect)

What may work:
- Always using approved gas (top tier with detergents - not really convinced on what impact this would have...maybe burning cleaner so less deposits making it out to the valves)
- DIY cleaning agents for valves (probably shouldn't try this unless you know a lot about cars - I don't)
- Driving for a long distance (highway) once or twice a week - perhaps also combined with higher revs for a limited time 3000 - 40000rpms or so (to burn off deposits)
- Spirited driving (to burn off deposits)

Warranty and other stuff:
- Most decent dealers will clean/replace under warranty once there is a check engine light and error code confirms (there might not always be a check engine light). Might want to make sure the error code wasn't simply turned off.
- Audi doesn't seem to be doing anything in terms of adding this to maintenance probably due to the amount of time it takes; dealer told me half day's worth of effort. This is quite sad and unreasonable as we as customers who purchase these luxury products should be entitled to having these products work...seems basic to me.
- Out of warranty you're looking at about $500+ every 3 years or so. Audi should step up and extend the warranty for this issue, likely though they're probably waiting for a class action.
- For dealers who try to ignore you I suggest you tap into the great wealth of knowledge available in this forum and others so you can challenge your dealer. Persistence is also a great technique....

So that's it...if you have an FSI engine you will eventually get carbon buildup and possibly have to dish out some $$$. As for me I've ordered an S5 with a 4.2 V8 FSI (new S5 with 3.0T is just too ugly) which should be arriving this Christmas....maybe I can get a discount on the valve cleaning with two FSI engines I'm an optimist....seriously though I will be writing a letter to Audi NA....this is so not cool Audi, clean up your act.
Thx for your great summary. It is valuable what works and what does not. It saved me from trying the catch can.
Do you have any assessment comparing impacts on Gas vs Diesel engines.

Thx
Sigq5 is offline  
Reply With Quote
Old 02-20-2016, 07:05 PM
  #344
AudiWorld Member
 
Join Date: Dec 2011
Posts: 203
Default 2nd carbon buildup cleaning

I'm not sure if I'm lucky or it's just a wake up call to get rid of my beloved Q5! Mine is an 09 and of course 3.2L. The first cleaning was done at 30,000 miles and about 200 miles from reaching the warranty end point (100,000 miles) for the carbon buildup, I got the CEL on and was confirmed to be it. The dealer will cover it but also noted that my injectors need to be cleaned and I'll be paying for cleaning those injectors around $350!!! Shouldn't those injectors be included in that carbon buildup cleaning???
amkmeco90 is offline  
Reply With Quote
Old 03-10-2016, 07:42 AM
  #345
Audiworld Junior Member
 
Join Date: Nov 2004
Posts: 27
Default Carbon code #

Hi - The check engine light came on on my 2011 Q5. I took it to an (european car) repair shop but they erased the code before they wrote it down. They tell me it will come on again but it hasn't (that was 2 weeks ago). My feeling is that this is a carbon built up issue, those anybody know the code(s) number? I have the extended warranty letter so I assume I should be fine when I take it to the authorized dealer, but I rather know the code before I walk in.

Thanks in advance, MJC
MJCow is offline  
Reply With Quote
Old 03-11-2016, 07:48 AM
  #346
AudiWorld Member
 
Join Date: Oct 2014
Location: Texas
Posts: 180
Default

Does anyone have experience on carbon build up in 3 liter Diesel engines?
If so, can you Pls share details
Thx in advanced
Sigq5 is offline  
Reply With Quote
Old 03-06-2017, 06:29 PM
  #347
AudiWorld Member
 
Join Date: Feb 2012
Location: Ottawa, Canada
Posts: 198
Default build-up again

My engine light came up again (100k km), first time was back in Sept '14 (45k km).

Checking the engine code and I got the same as before: P0491 & 492, therefore should be part of that extended warranty received before.

Let's what dealer says when i bring in the car.




Zigaroo is offline  
Reply With Quote
Old 03-19-2017, 06:40 PM
  #348
AudiWorld Member
 
Join Date: Feb 2012
Location: Ottawa, Canada
Posts: 198
Default

Update on my problem. While awaiting my appointment, after 5 days or so running with engine light on, it suddenly turned off by itself. I've checked the codes and they were still there. Last thursday, i brought the Q5 to the dealer and they confirm problem codes. The only difference this time versus the first time, i didn't really feel any thing wrong as the first time around i could feel the motor was losing power. So was a cleaning up nescessary? Audi still did the clean-up and it was covered under that extendend Audi warranty, so no fee paid.

On the other hand, while working the motor the tech saw that i had a leak on the coolant thermostat (#06E121111M) and suggested replacement, so it cost me close to $500 (cdn). As parts were aleady removed for carbon repair, they said i had a discount on labor (1hr less charged).

Also, just prior going to dealer, i had received the Audi recall for side airbag possible issue due sunroof (possible leakage in drain hose), dealer did also the recall and nothing broken/issue (no rust, no damage or leaks found. They applied protective wax, go figure on what they waxed.

PS. Service wise, excellent. I had a Q3 as a loaner for 2days. I wasn't really impressed by it, motor lacks power.
Zigaroo is offline  
Reply With Quote
Old 03-20-2017, 04:19 PM
  #349
Audiworld Junior Member
 
Join Date: Sep 2012
Posts: 16
Default It's Baaaack...

I have a 2010 Q5 with (yikes!) just over 250,000 Km. Yes, I drive a lot and I think was the first person here to identify the problem since Audi denied there was a problem..they blamed me and gas....

My engine light has been going on and off for a while. Then it just stayed on.
So, along with the need to replace the already ($583+) replaced water pump, fix a faulty throttle valve ($1310+), the secondary air ports also should be cleaned for $1418.49 +

It is so annoying that a fault in manufacturing design ends up costing the customer a LOT of money. This should not be warranty dependent when it is a manufacturer DESIGN FLAW.

Waiting for the 2018. It looks quite nice...but I I have sworn to never buy a first generation model again so this will have to last a bit longer...or maybe I'll buy a Porche or BMW if I can't wait...
Willo is offline  
Reply With Quote
Old 08-03-2017, 06:58 AM
  #350
AudiWorld Newcomer
 
Join Date: Aug 2017
Posts: 9
Default

Hey everyone. New here, I recently got a pre-owned 2011 Q5 2.0T with around 100k miles. Just did the piston and ring job and when the mechanic checked, they said there was no need for carbon cleaning. Which is very surprising given it is a direct injection and the number of miles. I know the previous owner did a lot of highway miles.
What are some ways of continuing preventing the vehicle from carbon buildup?
DBlueQ5 is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Cmmartin23
Parts For Sale
26
08-23-2016 05:44 PM
bballfreak
A6 / S6 (C6 Platform) Discussion
4
10-12-2015 06:14 PM
fixmya6
A6 / S6 (C6 Platform) Discussion
4
10-01-2015 03:00 PM
DanfZX14
A6 (C7 Platform) Discussion
6
09-29-2015 11:18 AM
2005audia6
A6 / S6 (C6 Platform) Discussion
4
09-08-2015 12:54 PM


Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 10:55 PM.


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: