Question about 1988 Volvo 740

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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 blueish 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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  • Moishe Katz Mar 12, 2009

    When we did a compression check, the first cylinder (closest to front of car) was at 70 and the others were at around 120. I understand that you are saying that I should remove that one spark plug, spray WD-40 into the hole, and close it up and see if it works.
    How much WD-40 should I spray?
    Do I have to let it penetrate before I restart the engine?
    When you say the PCV valve, is that the plastic piece that you connect the vacuum hose to (I think the one with the flametrap inside)?
    When you say clean the fuel injection, do you mean with a powerful fuel additive?
    What is the EGR Valve?

    Please excuse my ignorance.


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The smoke coming from the valve cover and dipstick is called blowby. It is combustion gases the have passes by the piston rings . A small amount of blowby is normal on all engines. The PCV system(Positve Crankcase Ventilation)pulls the gases out and directs them back into the egine to be burnt again. I would first check the PCV system to make sure it is working proper. Also a compression test of the engine will tell you which cylinder is not sealing proper. If the compression test is ok, a leak down check of the cylinders will determine if the engine is wore out.

Posted on Mar 12, 2009

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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

Posted on Mar 12, 2009

  • brian tessereau Mar 12, 2009

    not sure if last message went through. yes the pcv valve is the valve with the vacuum hose connected to it, you can clean it or replace it and see if that changes anything. the egr valve is the exhaust gas recirculation valve. it is located on the intake manifold and has a small wire harness going to it aprox 4-5 wires, if this is bad there will be a check engine light on or a code in the computer. you can disconnect the battey and wait a minute or 2 and reconnect and see if problem still exsist. has anyone checked to see if any codes are logged in the computer yet, if not your local auto parts store will do it for free. let me know what those are if you have them or get them. you can pull out the plug in the cylinder that has the low reading and spray 2-3 short burst of wd-40 in it hook up your compression gauge and check to see if compression reading changes, you dont have to wait. if it does then repeat 2-3 short burst re-install spark plug run engine at idle for a few minutes then recheck again, if reading has changed then note the reading and let me know. i can help you further then. thank you and good luck, tlak to you shortly

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SOURCE: 1988 Volvo 740 Smoke from Oil Cap and Dipstick hole when removed

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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