1988 Volvo 740 Smoke from Oil Cap and Dipstick hole when removed
I have a 1988 Volvo 740. Recently, I have been having an issue of oil
leaking from the fill cap (I think it started happening after I used
STP Leak Stop). The mechanic cleaned out some vacuum hoses at the oil
change and it basically stopped. Now it is leaking a little from one of
the bolts on top of the engine, but there is also smoke coming out of
the cap when I open it, and from the dipstick hole when the stick is
out. There are also fumes in the car, and I have to leave the windows
open. I spoke to a mechanic yesterday on the phone, and he told me that
I should replace the flametrap and the plastic pieces that go with it,
and possibly the breather box, and it should resolve my problem. I
mentioned this to my local mechanic today, and he said that because
when he takes off the vacuum hose, there is a bluish gas smoke from the
compressor coming out, he knows that the engine is finished (probably
piston rings), and has nothing to do with blockage.
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If you have recently had your oil changed,the oil filter may be loose or cross threaded.Also if you have had an oil change recently it could just be spilled oil. Make sure your oil filler cap is on tight and the dipstick is on tight. While you are at it check to see how much oil you have actually lost.If it`s not coming from the engine,i would inspect the oil pan gasket and the oil pan itself may have a hole in it.
the transmission fluid on the B230f engine with automatic transmission (Volvo 240, 740, 940), goes into the filler neck with the large yellow dipstick. it is located about 5 inches below the oil dipstick. good luck :)
When you remove the dipstick, do you feel air puffing from the dipstick hole? If so, you probably have a clogged PCV. Another way to test is to leave the dipstick in and remove the oil cap. Does it do the same thing? PCV.
Replacing involves removing the intake manifold. If you're not comfortable working on cars, I wouldn't do it. Seek out your local mechanic and pay him/her for their services.
good morning and welcome to fixya
you can try a couple of little tricks, try taking the pcv valve out and cleaning it or replacing it. try cleaning the fuel injection and look for carbon build up on or around the egr valve. you can also do a compression check on the engine and take readings see which one has a major loss spray wd-40 in the hole and recheck to see if compression changes, you might be able to fix just that cylinder if you dont want to fix everything else. good luck and let me know
presuming the oil is coming from around the filler cap..theres usualy a rubber seal around the base, these can become brittle and break,sometimes quite a large piece (1/4 inch) can break off making a fair old leak from the oil splashing around from the cam, replace it with a NEW one, should cure problem