Pages: [1]
Author Topic: 2010 S4 - P307A 00 [109] - Flow too Low and 6307 - MAP/MAF <-> Throttle Position  (Read 1019 times)
vtraudt
Sr. Member
****

Karma: +3/-0
Offline Offline

Posts: 283


WWW

2010 S4.

Always (since owning) has some idle hiccups after first starting.
Also seeing these codes (not sure if related):
6322 - Air Intake System
P307A 00 [109] - Flow too Low
6307 - MAP/MAF <-> Throttle Position Correlation
P0068 00 [237] - -

How to troubleshoot?
What might be causing the symptom (idle) and codes?

Car now has smaller supercharger pulley and stage 2 tune (but symptoms existed before).
I did not find a leak when smoking the engine (through intake).

Logged

2002 Allroad 2.7T 6spd stage 2
1998 A4 1.8T 5spd stage 3
1996 A4 2.8 auto stock
gt-innovation
Sr. Member
****

Karma: +26/-6
Offline Offline

Posts: 312



During my tests and never as stock i hit on this error and it was 100% software related (in my case) are you sure car had no stg1 before again with this issue?

Logged
SB_GLI
Hero Member
*****

Karma: +83/-6
Offline Offline

Posts: 1002



During my tests and never as stock i hit on this error and it was 100% software related (in my case) are you sure car had no stg1 before again with this issue?

+1
Logged
vtraudt
Sr. Member
****

Karma: +3/-0
Offline Offline

Posts: 283


WWW

During my tests and never as stock i hit on this error and it was 100% software related (in my case) are you sure car had no stg1 before again with this issue?

It did NOT have this CODE, but it had the same symptoms (rough running after first start, noticeable hiccups (with accompanying rpm drop every 10 sec for a minute or so).

Could the code and cold start hiccups and rough idle be attributed to intake valve carbon build up (like i have seen and addressed and a lot of 2.0T engines)? Car has 80k miles, had mechatronic problems (fixed), uncertain maintenance history.
Logged

2002 Allroad 2.7T 6spd stage 2
1998 A4 1.8T 5spd stage 3
1996 A4 2.8 auto stock
gt-innovation
Sr. Member
****

Karma: +26/-6
Offline Offline

Posts: 312



It did NOT have this CODE, but it had the same symptoms (rough running after first start, noticeable hiccups (with accompanying rpm drop every 10 sec for a minute or so).

Could the code and cold start hiccups and rough idle be attributed to intake valve carbon build up (like i have seen and addressed and a lot of 2.0T engines)? Car has 80k miles, had mechatronic problems (fixed), uncertain maintenance history.

So guess what...You have 2 different problems...

First of all your tune is not working and that is bringing you to a safe mode situation.

idle problems usually come from air leaks / bad sensors and some kind of hardware issue

4 steps.

1.Make you car stock
2.Fix the first issue "rough idle and such"
3.Get a proper tune.
4.Flash and run happily ever after.

Your engine platform apart from an oil pressure sensor issue and some bad compressor clutches is bullet proof if you take a good care and do the services in time. Have seen more problems gearbox related.
Logged
vtraudt
Sr. Member
****

Karma: +3/-0
Offline Offline

Posts: 283


WWW


1.Make you car stock
2.Fix the first issue "rough idle and such"
3.Get a proper tune.
4.Flash and run happily ever after.

Your engine platform apart from an oil pressure sensor issue and some bad compressor clutches is bullet proof if you take a good care and do the services in time. Have seen more problems gearbox related.

I smoked (leak test) the car but could not find a leak.

I suspect the issues might be related. At least from my experience with carbon build up on intake valves on 2.0T engines, rough idle, longer cranking, cold start (+ misfires, reduced power (from reduced flow)) can be caused by carbon build up. Can someone comment how common this is on the 3.0T?

Logged

2002 Allroad 2.7T 6spd stage 2
1998 A4 1.8T 5spd stage 3
1996 A4 2.8 auto stock
gt-innovation
Sr. Member
****

Karma: +26/-6
Offline Offline

Posts: 312



It is common on all engines with out mpi/pfi injectors...Especially VW ones after 80.000 km this issue gets worst and worst but you will not fill all this problems until you reach 130.000 140.000 km or more.
Logged
vtraudt
Sr. Member
****

Karma: +3/-0
Offline Offline

Posts: 283


WWW

It is common on all engines with out mpi/pfi injectors...Especially VW ones after 80.000 km this issue gets worst and worst but you will not fill all this problems until you reach 130.000 140.000 km or more.

a) What are mpi/pfi injectors? What injectors is the S4 using instead? Why are the "non mpi" injectors causing problems?
b) How can the code get worse? Or is the rough idle/hiccup getting worse?
c) Why do I "not fill all this problem" until 130k miles?
d) How to FIX the problem if the injectors are causing the issues? Replace with "mpi" injectors (whatever those are). Part number? Brand? Size? Style?
Logged

2002 Allroad 2.7T 6spd stage 2
1998 A4 1.8T 5spd stage 3
1996 A4 2.8 auto stock
coreyj03
Full Member
***

Karma: +10/-5
Offline Offline

Posts: 173



pull the supercharger off and walnut shell blast the intake valves to clean them.  also while you are in there remove and replace the PCV/ Breather assembly and thermostat.  these are common problems with this engine.  

Also check the operation of the intake manifold flaps with a vacuum pump.   Make sure there is no leak in the hoses and the solenoid is activating. improper flap operation can cause rough cold starts.
« Last Edit: October 03, 2018, 06:01:49 PM by coreyj03 » Logged
vtraudt
Sr. Member
****

Karma: +3/-0
Offline Offline

Posts: 283


WWW

So carbon build up on intake valve (and/or other intake components, flapper), like I have seen lots on 2.0T (I clean by hand with scraper, brush and home brew cleaning fluid)?
Logged

2002 Allroad 2.7T 6spd stage 2
1998 A4 1.8T 5spd stage 3
1996 A4 2.8 auto stock
gt-innovation
Sr. Member
****

Karma: +26/-6
Offline Offline

Posts: 312



a) What are mpi/pfi injectors? What injectors is the S4 using instead? Why are the "non mpi" injectors causing problems?
b) How can the code get worse? Or is the rough idle/hiccup getting worse?
c) Why do I "not fill all this problem" until 130k miles?
d) How to FIX the problem if the injectors are causing the issues? Replace with "mpi" injectors (whatever those are). Part number? Brand? Size? Style?

a) Normal/ common/ non direct Injectors that are not used for high pressure or direct cylinder injection.
b) Because you probably have your pcv broken
c) Something broke down at that point.
d) do a proper diagnosis and if you can not do it yourself visit someone who can.Stock injectors are fine.

ps. The dtc you get on higher rpm does not have to do with the pcv valve. Revert car to stock and test.
« Last Edit: October 04, 2018, 11:10:38 AM by gt-innovation » Logged
Pages: [1]
  Print  
 
Jump to:  

Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Page created in 0.02 seconds with 18 queries. (Pretty URLs adds 0s, 0q)