injector tac tac 1.6 TDI

**snakema** · 2nd December, 2019, 11:21 AM

Hello,

i need your help to detecting faulty injectors on my car? the injector make the noise.

i have golf 6 1.6 TDI 105HP.

a reprogramming do it with a update. do you have idea ?

THANKS YOU

**DiegoStud** · 2nd December, 2019, 04:33 PM

I can't detect them but VCDS probably could- Advanced Measuring values- Injection amount deviation, Injector valve capacity etc.........

**snakema** · 2nd December, 2019, 07:25 PM

Originally Posted by DiegoStud

I can't detect them but VCDS probably could- Advanced Measuring values- Injection amount deviation, Injector valve capacity etc.........

i have try with VCDS but i not find option : adapting injector minimum deviation quantity.

if you can show me how!

thanks you

**hid3** · 2nd December, 2019, 10:38 PM

Better do not start messing with that quantity adaptation.... Trust my words

**snakema** · 3rd December, 2019, 07:48 AM

Originally Posted by hid3

Better do not start messing with that quantity adaptation.... Trust my words

ok, How I detect the faulty injector?

**DiegoStud** · 3rd December, 2019, 04:24 PM

VCDS probably- Advanced Measuring values- Injection amount deviation, Injector valve capacity etc.........

To save this thread going round in circles- Read more carefully.
Who said anything about performing adaptation? How would adaptation fix a faulty injector anyway?

Advanced Measuring Values- live data- observe, log. When is it noisy? Intermittently or permanently? Engine temperature dependant? Number of pilot injections dependant? Unusual rail pressure fluctuations? Any other faulty sensors? Deviation in injection quantity between cylinders?

Plot twist: what if it's not even an injector issue? How's the EGR doing? How blocked is your inlet manifold? How's all the wiring?- Had a few with dodgy connectors. How's the NOx update?

Failing all that, invest in a stethoscope or if you can't afford it put a screwdriver against your ear and listen to each cylinder until you go deaf.

**roverfan** · 4th December, 2019, 05:48 PM

Stethoscope first. Try to isolate the various noises and then each injector. Takes a few minutes before you start to notice the different sounds

Also not really an injector fault but the injector copper washer seal and o ring are prone to failure on this model. Check each injector for blowby up from cyclinder.

**hid3** · 9th December, 2019, 10:55 AM

I'd also measure the fuel return flow for each injector...

**snakema** · 9th December, 2019, 11:06 AM

Originally Posted by hid3

I'd also measure the fuel return flow for each injector...

how i can measure them ? thanks you

**Lolo4321** · 9th December, 2019, 01:42 PM

Engine, Measuring blocks, 013. -+2.8 . Anything close to that value is an issue. ( idle)

**hid3** · 11th December, 2019, 10:48 AM

No. Examples are here:
https://www.youtube.com/watch?v=O0GlLY2OOtI
https://www.youtube.com/watch?v=Q1GapwFjFAw

**clau8829** · 29th April, 2021, 05:59 PM

This is closest thread I found related to this problem. I don't know if injectors are for sure my problem but all things point to this problem.
Car : Renault Megane 3 1.5 dci K9K 636 engine with start-stop on the red light. Injectors are the same as CAYC engine from Volkswagen/Skoda.
Problem :
1) bad vibrations in cold weather from the engine. It shakes for few minutes and maybe one cylinder stops firing for a while. This continues for 3-5 minutes until engine warms up a little.
2) problem got worsen now because even in good weather I hear knocks when getting of from stand still.

What I tried :
- EGR is ok it opens and closes as it should, checked on diagnose. It is also cleaned and free of dirt. Low pressure EGR also ok.
- I performed injector leak test and after 5 minutes of idle I have about 15ml of fuel very close each injector. Worst compared to best injector has less than 1ml difference. This means injectors aren't leaking.
- injectors are coded inside ecu so no problem here.
- flow meter is good
- checked MAP sensor ok
- turbo is in good condition and boosts till 2.6-2.7 bar at full power as it should

On diagnose I don't have minimum quantity for injectors. I only have injector corrections which go high ( up to 1.6 ) when engine works rough and as the engine warms up go low ( 0.8 ). Problem that I see is that these corrections move from one injector to another. When engine works rough rail pressure goes up at idle from usual 290-300 bar to 380-400 bar. There is not problem with fuel filter or air filter.

I found on pyren diagnose start in ddt mode that there are deviations for openloop map from injectors. What do they mean ?