Hi,

I have an 89 IROC L98 that has been sitting for a while and I'm having a problem. After the car runs for a short time oil starts to squirt out of the dipstick. It must only do it when I drive the car semi-hard because at idle it doesnt do it. It doesnt squirt out alot, but enough to drip down onto something (exhaust manifolds maybe) and start smoking. What can be causing this and how can I fix it?



Thanks!

Mike

 

crank case pressure, you have vented caps on valve covers. Bad PCV. Pressure in block will find a way out if it has to go through intake gasket. Most likely PCV valve... I'm more into older engines.

 

Yeah, crank case pressure, pull the pcv valve and shake it, it should rattle, you can clean em, but since they're less then 5 bucks at autozone why bother, just pick up a new one.

 

Excessive blow-by.

 

Ok, well I put two new PCV valves in and took the car out for a spin. It's still smoking like it was before but I think that might be because theres still some oil around the exhaust manifold from it squirting before. If the new PCV valves did not fix the problem, then what could be causing it?

 

2 PCV valves??
You should have 1 PCV valve in one valve cover and a breather tube that gets filtered air on the other valve cover.
Where's this second PCV valve located?
Normal amounts of blow-by are removed by the PCV valve.
If blow-by becomes a bit more excessive, some will go out the PCV valve and the rest will blow out the fresh air tube.
This tube/hose should be dry internally.
If it's wet (oily) inside, you have excessive blow-by and/or the PCV valve is plugged.

If the blow-by is really excessive, it can't get out the breather tube and PCV valve quick enough, so it finds another way out.
Valve cover gaskets, intake gaskets(front and rear), oil pan gasket, dip stick tube, or any combination of the above. It's gonna get out somehow.

If your still having problems, do a compression test, then repeat it after you squirt some oil in the cyls thru the spark plug holes.
If rings are bad, compression will jump up significantly after squirting oil in cyls.

 

I have PCV valves in both of my valve covers, which one is supposed to have filtered air? Is there like a rubber elbow or something that is supposed to attach the hose to that valve cover? If so, where do I get it?


Thanks alot!

 

What do you do if it wont stop. I pulled my motor because mine was doing it, the block was bored and boiled out and everything new. It was fine until i changed the oil and now it started again. I only have 500 miles on the new motor. It was not overfilled, so I am ast a loss
Thanks, Gary

 

If the engine was just rebuilt, and it sounds like it was from that "bored out and everything new" thing, you have a gripe with the engine builder.

Have a leakdown test done on it and get the results in writing. If you can't find a shop to do it, have a compression test done and get the results in writing. Take that to the engine builder...assuming the data shows one or more cylinder of out spec, and work out a deal to get it fixed.

It sounds to me like a pressurization issue as mentioned above. This is caused by cylinder pressure leaking past the pistons/rings into the crankcase. Root cause on a new engine is usually ring failure.

 

My L98 is all tore down at the moment, but I believe the drivers side had the PCV valve, and the pass side had the fresh air tube.
(Humm, could have swore I replied to this yesterday)

 

Thats correct. Theres a PCV valve on the driver side valve cover, and a breather tube on the passenger side valve cover. Take care of that problem though. That much crankcase pressure is not good.

 

Does it really matter wich side you have either component on?? As long as they are both there?

 

it doesn't matter which valve cover you put them in.