Leaking oil on top of engine

I am assuming this is when the spark plugs are still in place and the oil isn't from a spill when someone has missed the hole filling the oil.
If it is a leak the most obvious place the oil is leaking from will be the rocker cover gasket. Make sure you clean the plug and it's mounting hole before removing it to reduce any oil getting into the cylinder.
Take a good look at the top of the engine, there is a bolt on, full length cover right on top of the engine. A lot of engines have the oil filler cap mounted into it. There should a be a seal between this and the top of the cylinder head.
Changing this gasket is fairly easy and won't affect anything important like mechanical timing. If you can, clean the engine as best you can with a degreaser as this will help hunt the leak if it isn't the gasket.
*Note* When you remove the old gasket make sure both the surfaces that squeeze together are completely clean before refitting the new one. Also make sure the gasket is lined up correctly to avoid leaks. A TINY amount of gasket sealant can be used to hold the gasket in place when fitting the cover.
The cover bolts are NOT in too tight. You should wind them until you hit resistance then turn it a small amount more, Then Stop.

If you had a head gasket leak then there would be higher oil pressure but I think you would notice other signs of problems. Air and oil are typically sucked into the carburetor or air intake from the top of the valve cover. This is the Positive Crankcase Ventilation (PCV) Valve. You could try changing this valve. They are cheap and it is pretty easy to do yourself. In Honda's they can have problems leaking oil from this point and if yours is clogged for some reason, that may help (not sure).

As far as blowing a spark plug out, that is a pretty big problem. Immense pressure has to happen for the threads to fail, unless the spark plug wasn't screwed in all the way. I would say there is a mechanical problem in your engine somewhere. Either timing is off slightly or a valve isn't working correctly, or there is something in the cylinder that hit against the spark plug.

How did they repair the spark plug problem?

"leaking into the top of the second cylinder on top of the spark plug wire
only this matter !! cure that.

some engines have spark well. are you saying the wells fill with oil?
if yes, you didnt buy a real valve cover sit, try FELPRO that
comes with the well seals , with kit.
skipping is misfire. if the boots get fill of oil, sure it will misfire, how can it not?

these are known for distributor caps and rotors going bad,also if this is a vortec motor they also have a problem with the injectors leaking in the intake manifold causing pooling of fuel and a rich running condition,on the side with the leaking injectors.check for any codes and take a look at the map sensor.these should be checked out.

The oil doesn't leak from the head gasket, Unless it is broken. The oil is inside the engine, the head gasket seals out the water from the cylinder walls, and keeps the compression in. No oil, It could be coming from the rocker cover gasket just above the heads. They always leak. The engine sits at a slight pitch to get the oil out and down. And it usually leaks at the rear the most. Changing those gaskets is a job, you have to remove everything up top of the engine to get to them, then seal up the spark plugs too if they are in the covers. I did mine a few years back and they are just starting to leak again. It only has 250,000 miles, go figure. Check it out, hope this helps.

I hate to say this but it could be going straight into the engine, if it's not leaking or doing back into the overflow/rad..

Note I've included the instructions/info about knowing if your head gasket is blown (which could be causing the antifreeze to leak into the engine) This should help you out a bit diagnosing the problem.

1. Exhaust: When you have a gasket leak, you will notice white smoke coming out of your tailpipe. Sometimes drops of water will drop from the end of the tailpipe. The exhaust will also have a sweet smell to it.


2. Spark Plugs: Your spark plugs will display one of the last signs of a blown head gasket. If you have green dyed coolant in your system, the spark plugs will have a green tint around them. If the problem is very severe, the coolant may start squirting out of the plug holes which is not good.

3. Oil: You will notice a milky type ring surrounding your oil cap. This is caused by coolant entering the engine oil through the leaking gasket. This mixture leaves the milky type ring around the oil cap when it evaporates. You can check for this by taking the car for a short drive, then checking the oil for contamination.


4. Engine: Lack of engine power is a sign of a blown head gasket. The engine will lack power due to compression loss. The engine will also run poorly and will idle roughly. You should also be careful because the engine will overheat quickly when you have a blown head gasket.


5. Bubbles: A gasket leak will cause bubbles of air to come into your radiator. To check for this, you should first remove the radiator cap then warm up the engine. When you rev the engine, you will see bubbles come out from the top of the radiator.


Hope this helps, best regards, Happy Holidays!

IF LEAKING OIL ON TOP.LOOK AT THE POWER STEERING HOSES FOR LEAKS ITS ABOVE ENGINE ALSO.

You need to replace the spark plug tube seals. Buy a valve cover gasket that comes with the spark plug seals. This should solve your problem.

if the needle is on or around the letter N then thats normal. you can also change the oil sending unit. as far as the engine light once you change the EGR valve and the EPT sensor the engine light should go off

the valve cover gaskets were leaking oil around the spark plug boots making the boot swell and causing a voltage leak. the engine misfired and stop lights. i did a tune up with new cover gaskets,plugs, wires, cap and rotor and she runs like a top. vrooom, vrooom!!