Technical Uno 1100 PCV valve

[esqobar]

Hi there,

Does anyone know if the Uno 1100 92 model have an PCV valve/ or something similar. And where is it located on the engine.

My car blowing blue smoke out the tailpipe and and blowing oil out the valve cover breather pipe into carb pan.

please help,

Changed the valve seals over the weekend, and still the same. Blue smoke upon acceleration and none on normal idle.:bang:

 

[Ucof]

The Positive Crankcase Ventilation valve, or PCV valve, is a [ame="http://en.wikipedia.org/wiki/Check_valve"]one-way valve[/ame] that assists with the continual evacuation of gases from inside a [ame="http://en.wikipedia.org/wiki/Gasoline"]gasoline/petrol[/ame] [ame="http://en.wikipedia.org/wiki/Internal_combustion_engine"]internal combustion engine[/ame]'s [ame="http://en.wikipedia.org/wiki/Crankcase"]crankcase[/ame].



I'm not sure if the FIRE engines have one of those, however, seeing as I had to google "PCV", I don't think I'm qualified to answer this question.

My enthusiasm, however, would win first prize.

Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with the white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe. Blue smoke is more likely in older or higher mileage vehicles than newer cars with fewer miles. How did the engine oil get inside the cylinder in the first place? The car has many seals, gaskets, and O-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plug, it will cause a misfire (engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.

 

[alexGS]

Re: Blue smoke on acceleration - is there a PCV valve on a '92 FIRE?

I think the answer is 'no' - you have already found the engine breather (pipe from the cam cover) and if there is oil/excessive fumes coming from that, I'd say you have a broken piston ring, collapsed piston, hole in a piston, or similar problem Something is pressurising the crankcase, probably blow-by of combustion gases.

At the very least, it could be a blown head gasket where the pressurised oil feed is getting further pressurised by combustion gases?

Usually if it were any of the first three problems I mentioned, you would expect the engine to run quite roughly and perhaps make a ticking or knocking sound.

I'd like to think that maybe the oil is overfilled. That would be the ideal cause. The capacity of the FIRE is small - only about 3 litres from memory.

If the engine is running smoothly otherwise (as I gather it is), then start by draining the oil and refilling with the correct amount. Also check compressions in all cylinders - if one is low, prepare for a fairly major investigation of the engine.

Though, if you say you've changed the valve seals, does that mean you've already had the cylinder head off? (It is possible to change the seals in situ with special techniques).

Another clue might be given by the spark plugs - is one more oily than the rest?

-Alex

 

[esqobar]

Hi guys,

Thanx for the replies. Will explore some of the options you gave me.

Just to mention, the car is running Okayish- not really rough. there is no knocking or clicking sounds as yet. The seals were replaced using the so-called specialized technique (no head off).

The oil level is fine as I do not fill it above 3/4 full.

AlexGS you have mentioned that it could be a blown head gasket. But from the threads that I have read it is usually associated with either white smoke coupled with a loss of water. But the water levels are quite fine.

I am suspecting the compression. But the pullout is still okay. I am just saying.

 

[Ucof]

Do you have a compression tester?

 

[esqobar]

Do you have a compression tester?

Nope. A friend of mine did it for me. Apparently when the compression is right it should read about 1200 on the tester. And my car only showed about 900 on the tester. Excuse the improper use of terminology. Not very good with car terms.

Any suggestions?

 

[Ucof]

My only suggestion would be that you could try getting hold of a Haynes manual.
This will help in learning car terms.

Other than that, try perusing the forums. There's a wealth of information on here.

 

[jo0lz]

Nope. A friend of mine did it for me. Apparently when the compression is right it should read about 1200 on the tester. And my car only showed about 900 on the tester. Excuse the improper use of terminology. Not very good with car terms.

Any suggestions?

That's a low-ish compression reading
Could be as Alex has suggested that the piston rings are worn out