Is this blow by and what to do about it?
#1
Is this blow by and what to do about it?
1990 740 turbo
Smell oil/fuel in car under hard acceleration.
Have replaced front camshaft seal, oil trap and oil cap gasket.
Have checked hoses and connections.
Have changed oil and filter.
Runs well otherwise.
Oil cap will float while running when removed.
At a loss. Could the long hose going into the block under the oil trap be blocked? It looked clear. Do I have a "check valve" in this system as it's a turbo?
Marvel Mystery Oil?
Kerosene in the oil?
Clean out/replace hose going into block under oil trap?
What other options do I have?
Anyway to vent these excess gases out some other way?
Smell oil/fuel in car under hard acceleration.
Have replaced front camshaft seal, oil trap and oil cap gasket.
Have checked hoses and connections.
Have changed oil and filter.
Runs well otherwise.
Oil cap will float while running when removed.
At a loss. Could the long hose going into the block under the oil trap be blocked? It looked clear. Do I have a "check valve" in this system as it's a turbo?
Marvel Mystery Oil?
Kerosene in the oil?
Clean out/replace hose going into block under oil trap?
What other options do I have?
Anyway to vent these excess gases out some other way?
#2
#3
How many miles on the car? I have heard of using a "catch can" to prevent oil from getting into the intake. I believe that my car ('82 242 GLT) is also getting some blowby because under hard acceleration I can also smell oil. I haven't done the cap test yet. I was wondering if you couldn't somehow fit a PCV valve into the valve cover directly for added ventilation. You would probably need to somehow fit a grommet.
#4
#7
If you smell it in the passenger compartment, is it also laying down a smoke screen from the tail pipe? When you come to a stop does smoke seep from under the hood? Where the smoke comes from is an indicator of what the issue might be. As Andrew suggests, perhaps your motor is toast. Then again, perhaps your engine is coated in 20 years and a quarter million miles of oil and dirt. Perhaps the feed line to your turbo seeps, valve covers, etc. Hard acceleration means boost and boost means heat...lots of it. My turbo glows in the dark occasionally. Heat will cook off that old oily dirt near the turbo. High rpm's will sling even more oil out of aging gaskets and seals.
#8
I run full synthetic in my car so there is no smoke out of the tail pipe. However, under hard acceleration at night I can see "pseudo smoke" in the headlights of the person behind me. I am using quite a bit of oil at this point. Possibly a quart per week. But the old brick keeps going. Still I know that this is not good and the oil ending up in the intake is also a bad sign. 248k may be signaling a ring job. My motor is probably in that range as well. Damn Volvos are tough beasts!
#9
#11
It's hard to explain what I mean by "pseudo smoke". If I really push it at night and look back in my rear view mirror, I can see something in the exhaust. Synthetic oil doesn't really burn like conventional oil does. I am sure that if I was running conventional oil there would be a bit of smoke. I have been running full synthetic for the past 90k miles so there is no plan to change back to anything else. I don't believe that my oil consumption is coming from oil being burned. Rather the engine getting worn is causing more blowby which in turn causes more oil in the intake and stresses the ventilation system as well. See this article...
http://www.pbase.com/stealthfti/pcv
I should probably get a compression test done as well. But I have dumped so much cash into this car already this year. It is getting to the point of no return frankly. I might just be looking for a cheap Toyota for doing my food deliveries. I probably drive 2000 miles per month but have no idea since the odometer is broken.
But volvoQs you should look at that article and do a compression test also.
http://www.pbase.com/stealthfti/pcv
I should probably get a compression test done as well. But I have dumped so much cash into this car already this year. It is getting to the point of no return frankly. I might just be looking for a cheap Toyota for doing my food deliveries. I probably drive 2000 miles per month but have no idea since the odometer is broken.
But volvoQs you should look at that article and do a compression test also.
#12
No smoke from tailpipe. Talked to mechanic this morning. Think it is leaking from oil cap gasket now, but only under 1/2 or more throttle, also hear a slight hissing sound then. It must be burning off on the exhaust manifold. I tried some Rislone magic juice and am fully expecting it not to work. When it doesn't work, I am going to build the most unique invention ever for my volvo...going to drill a hole in the oil cap or valve cover (with it removed!) and install a rubber grommet and PCV valve, then run a hose to a collection device mounted in the engine compartment. See what happens! I can't afford an engine rebuild or a newer car, so need to limp this one along. Also going to simply try to behave and stay out of the throttle. Thanks for all of your help and comments!
#15
#16
No smoke from tailpipe. Talked to mechanic this morning. Think it is leaking from oil cap gasket now, but only under 1/2 or more throttle, also hear a slight hissing sound then. It must be burning off on the exhaust manifold. I tried some Rislone magic juice and am fully expecting it not to work. When it doesn't work, I am going to build the most unique invention ever for my volvo...going to drill a hole in the oil cap or valve cover (with it removed!) and install a rubber grommet and PCV valve, then run a hose to a collection device mounted in the engine compartment. See what happens! I can't afford an engine rebuild or a newer car, so need to limp this one along. Also going to simply try to behave and stay out of the throttle. Thanks for all of your help and comments!
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Tim Sway
2001-2013 model year V70
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04-12-2013 10:43 PM