All Things Mk5 > Mk5 General Area
Heavy sputtering around 5k rpm when accelerating hard
mjmallia:
--- Quote from: Reeceyy on September 30, 2024, 10:58:34 pm ---
I've also changed the low pressure fuel sensor the lower one on the HPFP which is on the fuel rail. None of this made a difference.
I haven't carbon cleaned the valves yet though but I've been told that carbon build up shouldnt be that bad because it's petrol and not diesel.
--- End quote ---
Direct injection petrol like our TFSI is the worst for carbon fouling.....loads of info about it
It can cause misfires like mine had where the carbon stops the valves sealing..........and also a total loss of top end power like my wifes golf had, where the valves were like ice cream cones, but sealing and no misfires.....zapping the power
mjmallia:
My wifes was similar to this on an FSI MK5 Golf
My TFSI GTI was a little less but the carbon was not allowing the valves to seal creating misfires.
Reeceyy:
--- Quote from: mjmallia on October 01, 2024, 08:34:44 am ---
--- Quote from: Reeceyy on September 30, 2024, 10:58:34 pm ---
I've also changed the low pressure fuel sensor the lower one on the HPFP which is on the fuel rail. None of this made a difference.
I haven't carbon cleaned the valves yet though but I've been told that carbon build up shouldnt be that bad because it's petrol and not diesel.
--- End quote ---
Direct injection petrol like our TFSI is the worst for carbon fouling.....loads of info about it
It can cause misfires like mine had where the carbon stops the valves sealing..........and also a total loss of top end power like my wifes golf had, where the valves were like ice cream cones, but sealing and no misfires.....zapping the power
--- End quote ---
So it's most probable that my problem is carbon build up? The injectors are dirty and are not feeding the engine with enough fuel?
Is a carbon clean expensive? Would I have to change the injectors too? Is there a way of knowing that there is carbon build up before taking the inlet manifold off?
Reeceyy:
The sputtering is now worse than ever. It don't even make it to the end of the rev range, it's as if It were bouncing off the rev limiter at 5000rpm. Most mechanics don't have a clue what this is as they just rely on their diagnostic machines and they are not giving them the proper fault code.
mjmallia:
--- Quote from: Reeceyy on October 01, 2024, 11:22:19 am ---
So it's most probable that my problem is carbon build up? The injectors are dirty and are not feeding the engine with enough fuel?
Is a carbon clean expensive? Would I have to change the injectors too? Is there a way of knowing that there is carbon build up before taking the inlet manifold off?
--- End quote ---
It is time consuming and took me a day at home to dismantle and clean out the carbon while the injector tips were soaking in petrol.
New injector seals are about £100 for genuine ones
New manifold gasket about £20
A variety of picks and wire brushes etc
General tools to take the manifold off
Time
If not the cause, it will def help make the engine run a lot better.
Faulty/lazy injectors will not help either
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