Where is the intake valve?
2.0 TSFI engine with 140K was giving misfires for number 3 and 4. Upon removal of the valve cover seems the intake valve disappeared?
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He’s talking about the intake valvepeteryorkuca wrote: ↑The intake is on the side.
No you seem to be confused. Look at the camshaft lobe. What’s the lobe supposed to press on?macnut wrote: ↑We seem to be getting confused.
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.
You have no idea what your talking about, what’s the camshaft lobe doing there? Is that hole supposed to be empty?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.
Listen to someone wrong like you or your buddy? Look at the OPs pictureCaptSmethwick 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.
Listen to @bubuski
Hate you joking or are you serious? How much compression is he gonna have on a missing valvethriftshopper wrote: ↑I'm just surprised the engine runs on 3 if not 4 cylinders and without making an ungodly racket.
Mar 11th, 2022 6:58 pm
If the intake (or any other) valve was missing, the engine would be making the ungodly racket. No further diagnosis necessary.tmkf_patryk wrote: ↑ Hate you joking or are you serious? How much compression is he gonna have on a missing valve
Mar 11th, 2022 7:43 pm
Yup but if it breaks into small pieces it could come out the exhaust then no more noisethriftshopper wrote: ↑ If the intake (or any other) valve was missing, the engine would be making the ungodly racket. No further diagnosis necessary.
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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 onel69norm 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
Mar 11th, 2022 8:38 pm
At which point the motor is probably toast, or require a really expensive rebuild.tmkf_patryk wrote: ↑ Yup but if it breaks into small pieces it could come out the exhaust then no more noise
Mar 11th, 2022 9:27 pm
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.
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A lot of Euro cars use that floater rocker 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.
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