Blown out fuel injectors

[ThunderstundAnchor]

I thought I’d post here and ask for advice. Earlier tonight I got stranded on the highway with two fuel injectors blown out of their holes.

I’ll try and tell the full story.

I bought a Golf 6, 1.6l 2011 model 3 months ago. Drove it and saw that the fuel economy was quite poor, and it would make a ticking noise at low rpm. Living in Kosovo we are used to having poor diesel quality and I left it at that. However it became a concern why my Particle Filter started getting clogged up and the warning light coming on at least once a week. In addition to that occasionally white smoke would come out of the tail pipe (unburned diesel).

I sent the car for a check up when the range displayed for full tank was just 520km. I had a Golf 5, 1.9 and I’d get easily 900km in a full tank. The mechanic diagnosed the problem as being a faulty injector. I sent the injector for a checkup/cleanup and it came back fine. Later on the mechanic advised me to put a type of oil to clean the injectors into the tank. I did that drove for 20km the engine starter ticking hard and then a bang sound came and I stopped the car seeing that I had blown an injector.

I did some research and the oil he put is a type of engine oil for chainsaws. I have used the same oil in all my previous cars with no fault, I had Golf 2, 1.6, Golf 4 - 1.9 and Golf 5 - 1.9.

Now the car is at the shop with a full tank of fuel mixed with 2L of that oil in it and the mechanic insisting that it wasn’t the oils fault!

Should I just go to another one and have the tank drained or should I trust him in fixing the car.

Links:
Oil: https://imgur.com/gallery/SnKVxBm
Blown fuel injectors: https://imgur.com/gallery/do4uSwH

[KLXD]

I doubt the oil caused an injector to blow out of the head.

Who reinstalled it after the testing? I suspect he caused it to blow out. Either overtorqued the clamp and broke the bolt or left it loose.

Is the bolt broken or did it back out of the hole?

[iluvmydiesels]

idk, just a possible opinion, as an 'oil' in a newer model like this, along with seemingly faulty injector service, the oil can increase combustion pressures, helping to blow out an already mis-seated injector. i didnt think you could even still think of using an oil like that in newer diesels, thats an old IDI trick, usually for pump lube, even inj lube. thought that oil fouls mk3 systems and newer. im not 100% sure, for the new and newer diesels if you still use purge. i know we do. (a3).

[BobnOH]

If you put the 2 L of 2 cycle oil right in the tank, not empty, it's possible it did something odd running straight. I just don't know, lots of folks have used that oil as a fuel additive with no bad results.

[turbobrick240]

The two stroke oil had nothing to do with the injectors blowing out. It could contribute to your clogged DPF though if you were using it for a long time.

[Ol'Rattler]

Originally Posted by turbobrick240

The two stroke oil had nothing to do with the injectors blowing out. It could contribute to your clogged DPF though if you were using it for a long time.

Agree 1000%. Also 2 stroke oil does nothing to clean injectors.
Improper injector installation and/or reuse of the TTY bolt caused the TTY bolt to break.

[iluvmydiesels]

it looks like OP put 2L of this oil in a ?full tank?, thats a hell a lot of this oil, i think for a full tank ~10gals it was ~2oz of oil. 2L is going to cause a lot of problems, and if you use it more than once.

[ghohouston]

Sounds like the cause has already been stated, either overtorqued (broken bolt, hold down, or both) or undertorqued injector hold down bolts that came lose. The ticking sound you heard was compression leaking past the injectors. Kind of hard to tell from the picture, but seems like the hold down on #2 is turned, but im not familiar with this particular engine, and how the injector hold downs are oriented.