You won't see the working end of the intake valves (that OBDII is referring to) by just removing the valve cover.
There may be other types of intake valves in a 2.0 TFSI engine serving a different purpose than the standard combustion process.
But to fix an OBDII misfire code you start by checking the coils and plugs for those cylinders indicated. Not by actually examining the intake valves themselves.
For misfires start by swapping the ignition coils then move on to spark plugs. On my current two boosted German engines the intake valves are visible through the intake manifold not the valve cover. I sold my VAG years ago before it needed any kind of intake cleaning but paging @ES_Revenge, who I recall knows these VAG engines pretty well.
OP: (1) Like others have said, you won't see your intake valves by removing the valve cover. On many cars, when you remove the air intake plenum, you can expose the intake ports to view the tops of the closed valves. (2) Why do you think the misfire is related to your valves? (3) Have you done a mode 6 test and do you know what the extent of the misfiring is (ie. number of misfires per driving cycle)? Personally, I would suspect the coil packs or plugs before I would start rooting around the intake ports.
You won't see the working end of the intake valves (that OBDII is referring to) by just removing the valve cover.
There may be other types of intake valves in a 2.0 TFSI engine serving a different purpose than the standard combustion process.
But to fix an OBDII misfire code you start by checking the coils and plugs for those cylinders indicated. Not by actually examining the intake valves themselves.
No you seem to be confused. Look at the camshaft lobe. What’s the lobe supposed to press on?
bubuski wrote: ↑For misfires start by swapping the ignition coils then move on to spark plugs. On my current two boosted German engines the intake valves are visible through the intake manifold not the valve cover. I sold my VAG years ago before it needed any kind of intake cleaning but paging @ES_Revenge, who I recall knows these VAG engines pretty well.
You have no idea what your talking about, what’s the camshaft lobe doing there? Is that hole supposed to be empty?
CaptSmethwick wrote: ↑OP: (1) Like others have said, you won't see your intake valves by removing the valve cover. On many cars, when you remove the air intake plenum, you can expose the intake ports to view the tops of the closed valves. (2) Why do you think the misfire is related to your valves? (3) Have you done a mode 6 test and do you know what the extent of the misfiring is (ie. number of misfires per driving cycle)? Personally, I would suspect the coil packs or plugs before I would start rooting around the intake ports.
The rocker arm and lifter are missing on the OP's photo
here's a better picture. click on the photo to enlarge
The hole in the OP's photo is where the lifter goes -- see where the red arrow points, The valves are underneath the camshaft, hidden in the OP's photo
.
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This is what the lifter/ rocker arm looks like. The cam rides on the machined round metal disk in the rocker arm
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Wow. I thought that hole was for a cam bar mount of some sort but thinking a bit more that will be too close to the lobe as pictured. Hard to imagine how that endine will sound running, should be more than just a normal misfire.
l69norm wrote: ↑
The rocker arm and lifter are missing on the OP's photo
here's a better picture. click on the photo to enlarge
The hole in the OP's photo is where the lifter goes -- see where the red arrow points, The valves are underneath the camshaft, hidden in the OP's photo
.
.
This is what the lifter/ rocker arm looks like. The cam rides on the machined round metal disk in the rocker arm
.
Never worked on looked at a newer OHC motor and didn't know rocker arms are still a thing (I'm still in the OHV age). I always thought OHC valves were direct driven like this one
I thought all multi-valve OHC motors were cammed this way
Last edited by thriftshopper on Mar 11th, 2022 8:39 pm, edited 1 time in total.
I smile when I see container ships sailing past my house laden with stuff made in China
l69norm wrote: ↑
The rocker arm and lifter are missing on the OP's photo
This is 100% the answer. Was going to say the same thing. This is "floating rocker" design, meaning the rocker is only help in place by the tension of the hydraulic valve lifter and the valve spring pressing it into the cam lobe.
Early Nissan SR20 used this design and were notorious for breaking / throwing rocker arms. Compares that to Honda of the era (and even now in the present) the rocker arms are shaft mounted, meaning that they cannot become dislodged. Nissan eventually changed to shaft mounted rockers for late model SR20's which solved the problem entirely, and used a totally different cam follower / bucket design on North American QR25 engines.
I'm actually really surprised to learn VAG uses this design on the 2.0T. They are in every vehicle they make, and you rarely hear about this kind of failure. Must be a lot better than that old Nissan design.
derass wrote: ↑
This is 100% the answer. Was going to say the same thing. This is "floating rocker" design, meaning the rocker is only help in place by the tension of the hydraulic valve lifter and the valve spring pressing it into the cam lobe.
Early Nissan SR20 used this design and were notorious for breaking / throwing rocker arms. Compares that to Honda of the era (and even now in the present) the rocker arms are shaft mounted, meaning that they cannot become dislodged. Nissan eventually changed to shaft mounted rockers for late model SR20's which solved the problem entirely, and used a totally different cam follower / bucket design on North American QR25 engines.
I'm actually really surprised to learn VAG uses this design on the 2.0T. They are in every vehicle they make, and you rarely hear about this kind of failure. Must be a lot better than that old Nissan design.
A lot of Euro cars use that floater rocker design.
