So i know i have been having trouble with my motor, seems like the rings have not seated properly and I leak about 4 quarts of oil every 200 miles of driving. Motor has about 3k miles on it since rebuild over the summer.

The car is throwing the code malf 33 - high pressure and low vacuum.

The shop has said that the oil leak is due to the high pressure and low vacuum in the crank case, and that is also probably the reason why the rings have not seated properly.

Does that make sense, can someone just explain how this would relate, and what would be the best way to handle this problem, how would i get rid of malf 33?

Shop has said that it isn't blowby causing the oil to leak and that compression and everything else seems to be fine.

There is a lot of blueish smoke shooting out of the exhaust however.

just trying to get some opinions and some solutions on my situation.

thanks
Z

 

DTC 33 is for the MAP sensor. MAP is the the absolute air pressure, measured in the intake manifold. Think of MAP as sort of the opposite of vacuum. You aren't pulling enough vacuum at idle. The DTC shouldn't have anything to do with the crankcase.

 

so am i pretty much likely going to have to pull the whole motor out? ive heard it is probably the piston rings since the movement of the pistons controls the vacuum in the crank case, and fixing that problem would probably get rid of the low vacuum.

what suggestions would you have as far as fixing the problem?

thanks
Z

 

I wonder if you have a intake leak sucking oil from the lifter valley?............

 

I noticed you have an aftermarket oil pan. Are you sure you aren't overfilling the crankcase with oil? It will burn oil like crazy if you do. With my Canton oil pan the oil barely touches the bottom of the dipstick when its full.

 

I wonder that too.

 

i use 6 quarts of oil which is the capacity for the oil pan, then i use about .5-.75 more when i add it to the oil filter since i have a taller oil filter installed, shows that it is within range on the oil dipstick.

doesn't make sense on overfilling though does it if i lose 4 quarts in 200 miles, which would mean i have less oil in the pan than the capacity.

as for the intake leak, what is the best way for me to check out?

just trying to get info on how to troubleshoot my situation since it seems i have more than one problem, and im not even sure if the rings will ever seat properly since its been about 3k miles.

 

To check for the leak, take your intake off and look for oil spot on the intake runners of the heads.

 

Wow you actually ran your engine 4 qts low. There is a quart in the filter so that doesn't leave much in the pan.

 

Take the oil cap off with the engine running after it warms up. If your rings aren't seating it will be puffing smoke out the valve covers.

 

alright, thanks for the ideas, im going to pick the car up on monday from the shop, and i might try a few things myself, but ill most likely take the car to another shop since this shop has made it obvious that they aren't going to fix anything.

so ill try to keep everyone updated as i find whatever problems that may be present.

thanks
Z

 

they didnt give you a warrenty on your engine?

I just got mine built from a performance shop and i have a 1 year 10k mile warrenty!