metro with oil in air filter housing.

[ahaus]

I have a 95 metro, with a manual trans in my shop. We just rebuilt engine due to two burnt valves and 176,000 miles on clock. Just before rebuild it started to use oil, 1 qt in 200 miles. Now when on highway with hot motor and accellerating after deaccellering it will blank a two lane highway with smoke, and air clean housing is coated with oil. Compression test is 145 psi at all cylinders, 20 inches of vacuum at pcv, and no obstruction with oil returns. The only problems I have found is 3.5 psi of back pressure from main converter, at oxygen sensor and check engine light will come on intermitantly during deaccell only, then go out when clutch is pushed or accell, has code for map senor low. While the lingo may be technical for most, I am hoping someone my have run into this oil in the air cleaner problem.

[Johnny Mullet]

Compression on a 3 cylinder Suzuki motor should be around 200 PSI especially after a rebuild. Try the compression test with a little oil in the cylinders. The car needs new rings and a cylinder honing after the groove is removed.

I know you just got it all together, but you have to remove the head again and then drop the pan and start popping pistons out. DOCTORBILL did his at home on this thread.............

http://www.automotiveforums.com/vbul...d.php?t=613410

The car is worth saving. Removing the head a second time is a lot easier when you did it once already. You will need a new head gasket and possibly a exhaust manifold gasket, but the intake can stay attached.

[91Caprice9c1]

Originally Posted by ahaus

I have a 95 metro, with a manual trans in my shop. We just rebuilt engine due to two burnt valves and 176,000 miles on clock. Just before rebuild it started to use oil, 1 qt in 200 miles. Now when on highway with hot motor and accellerating after deaccellering it will blank a two lane highway with smoke, and air clean housing is coated with oil. Compression test is 145 psi at all cylinders, 20 inches of vacuum at pcv, and no obstruction with oil returns. The only problems I have found is 3.5 psi of back pressure from main converter, at oxygen sensor and check engine light will come on intermitantly during deaccell only, then go out when clutch is pushed or accell, has code for map senor low. While the lingo may be technical for most, I am hoping someone my have run into this oil in the air cleaner problem.

Many of us have dealt with the oil in the air cleaner.

Sounds like the cat clogged up from gulping all that oil. As you are probably aware as a professional, your MAP code is most likely a result of the extra backpressure especially with the way the code goes away when the clutch is disengaged.

Your compression figures are low, and combined with the smoke cloud I am led to conclude that you didn't include rings/hone. Slapping a fresh head on old rings, as awesome as the shop profit is, is not recommended, and precisely for this reason. Your shop is experiencing blow-by passed the rings, which is pressurising the crankcase, and driving oil through the intake.

Other possibilities include a missing anti-drainback valve, improperly installed piston rings (indexing), bad hone job etc...

The drainback valve installs in the deck of the block, and moderates oil flow into the head, as well as preventing the cam journals from going dry while not running. In the absense of this valve (in combination with a certain head gasket design) will result in your exact symptoms.

-MechanicMatt