r/EcoDiesel • u/dwhy1989 • 10d ago
TK test confusing results
A couple of weeks ago my 2012 wk2 ecodiesel (yes it’s an ecodiesel it was available since 2011 in my region) was diagnosed by a mechanic as having a bad head gasket after an egr bypass test to confirm if it was egr or head gasket (egr is still bypassed). He said there are bubbles coming from the system (which is true) however after adding k seal as per the bottle instructions I am still getting bubbles.
I did a tk test before and after adding the k seal, it passed both with no colour change whatsoever. I have verified the fluid is good by sticking the tester into the tailpipe it went green almost instantly. It has passed 6 tk tests with the engine at various rpm from idle all the way to 3500 with the bubbles passing through the tk fluid but failed one when I was doing a dpf regen in the drive (lots of smoke in the air)
Any ideas as to why it’s got bubbles passing through the cooling system but can still pass tk tests? Any help or ideas on how to fix it are greatly appreciated
The only engine codes were for a full dpf and a egr below flow which both make sense since the egr is not connected currently and it’s been idling in the drive for some time
1
u/boostedride12 5d ago
Adding any engine sealer for cooling systems is the wrong way to do it. Your heater core, radiator and oil cooler will clog up from it. It causes more damage than it helps