I am in need of some suggestions as to what could be wrong with my motor. I have a B18C1 in my 90 Hatch. I lose oil pressure once warmed up and have no oil pressure on idle, but can maintain SOME pressure if I keep the rpms up at least to 1500. Knocks very bad if I let it idle and will ultimately die. but doesnt obtain full 60 psi oil pressure under acceleration or 40 psi under cruise. It typically has about half of what it should. A big plume of smoke comes from tailpipe if I let off the accelerator, then get back into it. It loses power once warmed up. Feels like the motor is running in mud. It has also developed a miss and is hard to start. It more or less stumbles to a start and isnt a smooth start up. Also, after driving and getting to the point of warming up there is a horrible hissing sound coming from around the area of where my intake manifold bolts to the block and is spewing steam. It loses about a half gallon of water in about a 15 - 20 min span. Basically once it warms up. So... whats wrong? Any suggestions? Anything I can check? Anything I omitted that could help diagnose? Thanks in advance everyone.

 

Glad everyone decided to put their 2 cents in...

 

wow what isn't wrong. you have some serious internal issues going on with your motor. firstly, STOP RUNNING YOUR ENGINE if you are dumping coolant and have no oil pressure. your oil pump is failing on you and buy revving it up you're only causing more damage then good. the smoke is leaking stem seals and or piston rings.

as far as your leak goes you have a split or torn hose, you'll have to poke around to fix the issue, but honestly it is time to pull the poor thing and rebuild it

 

you sir, probably blew it up. rebuild it. no oil pressure=poop on engine. and your water pump needs replaced, but thats on the bottom of the list for you it seems like.