2018 outback touring 2.5 engine This has been a fairly good car. My 2004 code is so intermittent, course i lose eyesite cruise, near all light s on dash come on. next day,everything great.. month later , happened again, so i cleaned intake with crc. no light for 2-3 months. now lights came back on,no cruise ect, i grabbed sea foam, did the cleaning again. 3-4 weeks ok. now i have 2 codes,P2004 and P0172 (system too rich ) i already cleaned the throttle body too. so, before i take intake off, has any of y'all got this far and had to end up replacing the complete intake and will it come complete with everything i need? i'm new here,1st post hope it goes to right place. thank you steve
steve.acoolbreezeac
Did you take the intake off to clean the TGV?
Each side has an actuator and a position sensor. If there's a lot of sludge built up around the TGV butterflies, it won't move easily.
I suggest you remove the intake manifold and thoroughly clean the TGV on both sides. Get the manifold channeling cleaned.
You can check the operation of the actuators while the intake is off by hot wiring it to the battery. It moves both ways by changing the + feed.
Each side has an actuator and a position sensor. If there's a lot of sludge built up around the TGV butterflies, it won't move easily.
I suggest you remove the intake manifold and thoroughly clean the TGV on both sides. Get the manifold channeling cleaned.
You can check the operation of the actuators while the intake is off by hot wiring it to the battery. It moves both ways by changing the + feed.
Earlier this year I got some P2004 codes and the dash lit up like a Christmas tree and then it went away. I was noticing that the engine seemed to be stumbling a bit at lower RPM's and was fine at highway speeds. Did get the occasional misfire code as well. After a lot of searching around on this forum I eventually decided to remove the intake manifold thinking that the problem was probably due to some of the flap screws loosing up and one of the flaps moving a bit out of position and causing it to never close fully at lower rpms, it was far worse than that...
![Image]()
The screws had come out completely and the flap was just lying their near the valves. My next worry was where the heck the screws went, luckily they didn't get sucked into the combustion chamber as that would have likely been $$$$:
![Image]()
Somehow I got very lucky and the two screws wedged in that slot on the manifold. Turns out 3 of the other 6 screws for the other three flaps were very loose as well. I had driven about 400 miles with the flap like this as I was on a trip far from home. I ended up just replacing the manifold rather than hoping I could get the screws in tight enough, it didn't look like there was any threadlocker or anything on them from factory. The car had about 120K miles on it at the time.
The screws had come out completely and the flap was just lying their near the valves. My next worry was where the heck the screws went, luckily they didn't get sucked into the combustion chamber as that would have likely been $$$$:
Somehow I got very lucky and the two screws wedged in that slot on the manifold. Turns out 3 of the other 6 screws for the other three flaps were very loose as well. I had driven about 400 miles with the flap like this as I was on a trip far from home. I ended up just replacing the manifold rather than hoping I could get the screws in tight enough, it didn't look like there was any threadlocker or anything on them from factory. The car had about 120K miles on it at the time.
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