I'll cut to the chase: I've got an '02 Toyota Corolla with just over 155,000 miles on it. On initial startup it revs up and will idle at around 1500 - 2000rpm. It will usually lower to it's normal idling range after it's been put into drive/reverse and driven a bit.
I believe I know the culprit, as Cylinder 2 is showing around 135 PSI and not the expected 150 - 155 as the other Cylinders. My question is what could be causing the slight leak in pressure? Would it even be worth cracking into the engine to try and replace the gaskets or whatever has likely failed? The car runs and drives fine and hasn't posted an error code, so should I drive it 'till the engine/cylinder goes? And would this even be the cause of problem 1 or do I have a dirty MAF sensor aswell, or something?
which engine
Did you do a wet/dry compression test? Did you check the valve stem seals? Need more information to make an intelligent decision.
No, you don't need to open the engine. 135 psi is not the end of the world, and not bad enough to make the engine die. Changing your head gasket won't do anything if your piston rings or valve seals have wear.
Try the simple things first:
inspect spark plugs, air filter. Clean the intake and check for vacuum leaks. Fuel injection cleaning, test fuel pressure etc...
Have you pulled the spark plug on that cylinder to see what it looks like?
I had the spark plugs replaced last month. And they all had some carbon build up, the car has burned oil for the last 3 or so years I've owned it so it's not unexpected, but this low compression cylinder is a new development.
From head gasket to valve issue scan result in low compression in a cylinder. I say it does not worth fixing since your car burns oil as well.
From head gasket to valve issue scan result in low compression in a cylinder. I say it does not worth fixing since your car does not have drivability issues besides the oil burning.