All Things Mk5 > Mk5 General Area
Heavy sputtering around 5k rpm when accelerating hard
GreigC:
I’d say your injector(s) are the issue. Common symptoms are under load it can feel like lumpy/misfire also sitting at idle it can feel like it’s misfiring (usually a very minor wobble) also injector(s) cause intermittent cold start spluttering. It’s very common on these engines and although can be refurbished or bought second hand most of the time a new set are required about £1000+ often left and when the next owner has went though coils, plugs trying to find the issue they leave it because of the cost. A carbon clean will also help and usually makes sense to do when your replacing the injectors but again comes down to cost/time.
ZoliWorks:
--- Quote from: GreigC on October 01, 2024, 04:20:21 pm ---I’d say your injector(s) are the issue. Common symptoms are under load it can feel like lumpy/misfire also sitting at idle it can feel like it’s misfiring (usually a very minor wobble) also injector(s) cause intermittent cold start spluttering.
--- End quote ---
Lol I have all of those symptoms. Another thing the car does is lose all rail pressure after stopping the engine in just under 20 minutes. Like literally no pressure when opening the bleed valve. When I open the door so the electric fuel pump kicks in, i can hear how it's pushing out bubbles from the system. Most tuners I spoke to said my map is poorly done cause too much boost for K03 injectors but the tuner himself says it's the injectors that are the problem.
--- Quote from: Reeceyy on September 30, 2024, 11:01:40 pm ---I suppose it's more or less the same problem as what I'm going through then. The only difference is that I have k03. The map is maxed out though. What's the cure for this then? Have you sorted the problem out?
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Carbon buildup and/or injectors most likely. I'd log lambda just to see what the values are. For me, I've carbon cleaned my intake valves back when I bought the car last year so for now the solution to my problem is to fit some proper, brand new K04 injectors and remake the map.
Reeceyy:
Sorted! Ended up being a MAF sensor! I went back to the guys that remapped it. It was misfiring in all cylinders. I even cleaned the MAF a few weeks back but it made no difference! It has to be changed. At the moment it's unplugged but going as well as ever!! I finally got my car back!
Just don't ever take a mechanics word for it. I was told that it was the cam chain. This was never the cam chain and I knew that. I had my lambda sensor changed because that was coming up in their diagnostic tool. It wasn't that either. But you end up paying for it.
The only positive that's come from this is that I changed the piston in my HPFP!
Just another note. I had 11 engine faults and not one of them was related to the MAF sensor. Be careful here because mechanics rely on their diagnostic tools nowadays instead of their mechanical knowledge. I had 2 lambda sensor faults, I had a boost pressure fault the p0229 one. I had the multiple misfire fault and misfire in cylinder 1,2,3 and 4. I also had a low fuel pressure fault.
Good luck guy and thanks for the input. Much appreciated.
ZoliWorks:
Nice, glad you sorted it out. I'll also try getting a new maf, even tho mine doesnt seem to be giving me issues.
GreigC:
I was well off! Glad you got it fixed man.
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