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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKVI-A6 Golf family including Jetta SportWagen (~ 2010-2014)

VW MKVI-A6 Golf family including Jetta SportWagen (~ 2010-2014) Discussions area for A6/MkVI (2010-2014) Golf and Golf Wagons (Jetta Sportwagon in the USA).

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Old April 13th, 2019, 22:19   #1
Join Date: Feb 2009
Location: Edmonton, AB
Fuel Economy: lousy
Default Injector nailing?

This past winter my car has been pretty consistently having really loud pinging/nailing (like someone shaking an empty rattle-can really quickly). I want to say it was shortly after I had it taken in after a no-start from intercooler icing up but I canít say for sure.

Itís not all the time. At least quiet enough that I donít notice it sometimes. Increasingly worse until 2000rpm under light to mid throttle. Bloody annoying and whatís worse is VW isnít looking into it other than to have s mechanic test drive it. He figures nothing wrong.

Iíve heard that winter fuel combined with some of the injection cycles for regens, etc can make pretty loud clattering but Iíd like to prove to myself that thereís nothing amiss before I go searching for a jugular at the dealership.

What are some tests I can perform to check things out? Iíve got a vcds at my disposal. Iíd be willing to purchase a compression tester if thatís something I need to do. Is injector deviation the only thing I can really dig into? I canít recall the deviations I read but they definitely were not 0.0 across the board. Stethoscope at the top of the injector is loudest/hardest knock on cyl 1, then 2 but that might be the knock from cyl1 carrying over.
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Old April 14th, 2019, 21:04   #2
Join Date: Feb 2009
Location: Edmonton, AB
Fuel Economy: lousy

Really, no VCDS expert wants to chime in?
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Old April 15th, 2019, 08:04   #3
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Join Date: Nov 2013
Location: NJ/PA
TDI(s): 2014 Jetta
Fuel Economy: Best tank:54.7. Drove From Chattanooga Tennesse to Poconos PA

It's been in my experience that if youre looking for vcds specific testing/logging, you'd be better suited in asking at the rosstech forums.

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Old April 15th, 2019, 09:12   #4
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Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic

You can monitor the cylinder pressure sensor values, at least to see if one cylinder is way off, but it really should not vary much or the ECU will flag a DTC.

I would try some injector cleaner for a couple tanks, and see if anything improves. I know this is one of the post-fix complaints I hear here a lot: "the car sounds more like a diesel now", which I know isn't very scientific.
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Old April 15th, 2019, 15:27   #5
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Join Date: Sep 2001
Location: here

VCDS Measuring Values Blocks 140 and 143.
Minimum coolant temp = 50C

Not in regen... If you see one of the fields in MVB 143 = 18.4 while the others are some smaller value, under some load, then that's a bad pressure sensor and or injector. All of them = 18.4, then it means the diffference is enough to put you in "mini limp mode" so to speak.

If you see MVB 140 with one of the 4 fields that remains significantly different from the others = bad injector

Peak cylinder pressures are not all that relevant
HP is for show, TQ is for go.
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