Hello everyone
its me on a new day with problems of course.
Civic EU Sedan 1.8 R18a2, stickshift, 80k miles from 2010. Driven in mixed cycles of city (sometimes heavy traffic) and short trips and half intercity/highway driving.
I fixed many stuff with this piece of crab (sorry) and put it on sale as I hate it so much however she loves to surprise me:
Two things:
Nr 1: in January after standard service (oil, filters) few weeks later orange check oil pressure light came up. I stopped checked the level and it was at max. Started the car, warning gone, ran OBD from bluetooth, no codes.
Today it came up again(before that first orange warning - exclamation mark with triangle came up and disappeared after shutting the car off), while I was so close to home, stopped checked the oil, again max level.
nr2: long years, especially while going uphill (sometimes) it can be first start at lights or while driving on a certain gear (especially if you push the pedal a bit strong) Rpm goes up for example from 3000 to 3500 but wont go further ( max to 3500-400) and speed wont increase in parallel, after 2-3 seconds all goes back to normal. It happens sometimes on straight road but in most cases while driving uphill.
This happened very rarely but last 3 weeks its gone mad. It happens a lot. But at the same time during same driving cycles, it drives like beast, you kick it on 3rd, 4th, 5th it accelerates many times without issue and like a monster, goes up to 90-100 mph without hesitation
Car also has the problem with jerky acceleration if you floor the pedal a bit around 2-3k rpm on every gear.
I am so sick and tired of it really, normally i ignore all these but i dont want to ignore oil pressure warning to avoid any engine damage.. And also while I want to sell, if I can i want to fix it a bit and then sell.
What I have done before you ask (these are only engine related, i have done so many other stuff)
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around 15k miles before, in Honda adjusted the valve clearances.
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around same time, replaced the sparks.
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swapped ignition coils with another honda to check, still same problems.
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Removed the throttle a year ago, and gave it a good clean.
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upstream o2 sensor replaced, with original Denso.
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Cleaned EGR no avail, bought a used one, no changes.
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Removed battery few times and idle relearn
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maf, map cleaned (also lately)
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pcv valve replaced
I think what I didnt touch are spool valve, downstream o2 sensor and cat
I left it lately to my mechanic but he couldnt find anything weird but I doubt that he checked anything with CAT.
Two usual suspects i have are clogged cat as the acceleration issue happens generally while driving uphill or clutch going bad.
I have done some additional tests: on 3rd and 4th gear, release the pedal and car stalls. Ond 2nd without handbrake slowly releasing clutch pedal, lots of vibration but car moved at the end slowly. Gears change fine, sometimes having problem putting into one but rest go in/out well.
There is also this weird noise from left side of the engine somewhere, so its not the belt/chain - not sure what it is it did not exist before, it sounds like saul goodman`s suzuki esteem 
What do you think?