BLOW BY 89 TOPAZ COMRESSION WITHIN SPECS PCV VALVE IOK

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First, there is a PCV valve, unless someone removed it.
A local car parts store or garage should be able to tell you where it is located.
Second, a lot of pressure ( usually called "blow-by") can be a problem.
Blow-by that is extreme can blow the oil out of your engine whilst you are driving it, and cause motor failure.
I should recommend you deal with the PCV valve first, and be certain the pipes and or hoses are good to it, as this has a lot to do with blow-by.
Other than the PCV system, blow-by can also be caused by worn rings on the pistons or worn valve guides.
God bless your efforts.

Here's a link to the pcv valve,could be glogged up causing pressure to back up,Here's the pcv valve.

intake manifold upper and lower 89 in. lbs.

valve cover 89 in. lbs.

The solution is to remove the grommet on the valve cover (for the small line) and replace it with a grommet for a 1985 CJ7 along with the PCV valve for the CJ7. Prior to replacing the grommet, you must bend a metal tang inside the valve cover using a screwdriver. This tang is what forms the "spring" in the built in CCV valve. Bending it up, opens the valve all the way permanently.

Next, take a 3/8 inch quick connect air chuck (the kind you screw into a blow-gun or tire chuck for use on an air compressor equipped with quick connect fittings) and replace the screw in nipple on the manifold (where the original tube attaches) with the air chuck. The chuck is an exact fit (threading and length)but has a much larger internal diameter for the crankcase gases to flow. Finally run a section of 3/8 inch fuel line from the newly installed PCV valve to the new air chuck nipple you screwed into the intake manifold. Attach a hose clap at each end of the fuel line and you're done.

For the 1989 Mercury Topaz 2.3L In-Line 4-Cylinder:

Firing Order:
1-3-4-2
Cylinders:
........(back).........
|...1...2...3...4...|
........(front)
Distributor:
....(back)
(+)...4
...............2
3
........1...(+)-screw
....(front)

Let me know if this helped...

Mercury Topaz Answer 4 cylinder 1-3-4-2 6 cylinder 1-4-2-5-3-6 Taken from page 1-2 of Haynes Repair Manual for 84-94 Topaz & Tempo
Good Luck!!

One at front usually goes to the air cleaner box...rear one is for pcv valve, but if cover was installed backwards they may be reversed. Pcv hole usually has a baffle inside to keep it from sucking oil into the airstream.

There is not a PCV valve on the 4cyl. 6 cyl. is located under hood, center, upper engine area, mounted in rear valve cover Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.