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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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He's right. you have 2 options, replace motor or rebild it. either way it's not cheap. good luck

Posted on Mar 12, 2009


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Posted on Jan 02, 2017


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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

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