Sticky Engine Check Valve?......

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Sticky Engine Check Valve?......; Big cloud of Blue smoke.....
Topic Started: Jul 27 2009, 12:30 AM (149 Views)
Shanester	Jul 27 2009, 12:30 AM Post #1
New Member Posts: 11 Group: Members Member #421 Joined: Jan 30, 2009 Location Western Oregon Year/Make/Model 1991 Geo Metro 2 door XFI 5 speed	Alright guys...every so often When driving my '91 Geo down the highway she'll shoot out a bunch of Blue smoke...this is when I am driving around 45-60 mph...to get it to stop I just let off the gas....it only lasts for a few seconds..then it's ok...it doesn't happen all the time...just every so often... I got 5w 30 in it....but I do know the engine sat 20+ years in a wrecking yard before I bought it and got it installed....I am thinkin it is that little oil check valve that is sticking...not sure...is there anything I can do to prevent this?...thanks...Shane Edited by Shanester, Jul 27 2009, 01:04 AM.



crankcase	Jul 27 2009, 12:53 AM Post #2
Posts: 448 Group: Tech Certified Member #960 Joined: Jul 9, 2009 Location Austin, TX Year/Make/Model 1992, 1993, 1994 Geo Metroa	Sounds like a classic Metro problem, a burned exhaust valve. Check to see if there is a lot of oil around the air filter. A compression check will help to verify the problem. If that turns out to be the case, many people have fixed this problem by doing it themself.



Bad Bent	Jul 27 2009, 12:57 AM Post #3
Facetious Educated Donkey Posts: 4,232 Group: Moderator Member #334 Joined: Dec 26, 2008 Location Native of SoCal, existing in McCall, Idaho Year/Make/Model 1991 and 1996 Geo Metros	I suspect the PCV valve. But the compression check is a good idea. Located between the Valve cover and Air cleaner, "The PCV valve is a spring-loaded valve with a specific orifice size designed to restrict the amount of air that's siphoned from the crankcase into the intake manifold. This is necessary because air drawn through the valve from the crankcase has a leaning effect on the fuel mixture much the same as a vacuum leak. So air flow through the valve must be controlled within certain limits. At idle, air flow is reduced because little blowby is produced. When the engine is cruising and vacuum is high, airflow through the PCV valve is at a maximum to purge the blowby vapors from the crankcase." Sticking might be the cause for "just every so often." Might try Seafoam on an engine that's '20+ years in a wrecking yard.'



Shanester	Jul 27 2009, 01:01 AM Post #4
New Member Posts: 11 Group: Members Member #421 Joined: Jan 30, 2009 Location Western Oregon Year/Make/Model 1991 Geo Metro 2 door XFI 5 speed	I have a new PVC valve..just haven't put it in yet..I am suspecting that is what it is...



Woodie	Jul 27 2009, 05:59 AM Post #5
Posts: 1,931 Group: Tech Certified Member #471 Joined: Feb 13, 2009 Location Laurel, MD Year/Make/Model 98 Metro LSI 4/5	Standard Metro "Oil Phart", not uncommon at all. The PCV system isn't great and excessive blowby gas in the crankcase is overwhelming the PCV valve and pushing oil into the air filter. The faster you're going and the wider the throttle is open the more likely it is to happen, for right now, slowing down a little will stop it. Replace the PCV valve and clean out the hose, but chances are, you've got a blowby problem. Get a compression test, I bet you'll find you need rings. When you rebuild it, make sure the oil check valve is in place and open up the oil drain/crankcase vent passages on the new head gasket. The newer cars have a valve cover with an oil separator built into it, it has a finned bulge to the left of the oil cap. If your valve cover is flat except for the oil cap and four acorn nuts holding it down, you've got the old style. This valve cover might help, but that's not the real problem, you shouldn't have that much blowby.



redpepe	Jul 27 2009, 07:41 AM Post #6
Elite Member Posts: 157 Group: Members Member #700 Joined: Apr 27, 2009 Location el rio, ca. Year/Make/Model 1991 3cyl, manual	hi shane. just rebuilt my 326k mile engine and had never had the oil phart problem previously but it started immediately after the rebuild. i only got great white clouds at speeds above 60 mph +/-. i have the old style valve cover. after lots of experiments and the advice here, i replaced the new head gasket. i modified / enlarged the upper oil return holes in the gasket and that fixed the problem. your pcv and your rings could be the causes however and the compression check and pcv replacement are good starting points. the metro is very easy to work on and a few careful checks and repairs usually do the trick.



iamgeo	Jul 27 2009, 10:33 AM Post #7
Posts: 567 Group: Valued Members Member #798 Joined: May 25, 2009 Location Lakehills, Tx Year/Make/Model '98 Chevy Metro '96 Geo Metro Both 3 Cyl. 5 speeds & 99 S10 Chevy 4 cyl	Quote: but I do know the engine sat 20+ years in a wrecking yard The car is only 18yrs old. Did you put a much older engine in the car?



Woodie	Jul 28 2009, 06:22 AM Post #8
Posts: 1,931 Group: Tech Certified Member #471 Joined: Feb 13, 2009 Location Laurel, MD Year/Make/Model 98 Metro LSI 4/5	Oops, I missed that sat in a junkyard bit. Could be stuck rings. Fill the cylinders with kerosene, put it in gear and rock the car back a forth for a minute or so. Then, CHANGE THE OIL!!! and see if it gets any better.



ki4syr	Jul 28 2009, 07:15 AM Post #9
Metro Newbie Posts: 172 Group: Members Member #274 Joined: Dec 2, 2008 Location N.C. Mountains Year/Make/Model '94 Metro G10/auto, '10 Forester, '10 WRX	iamgeo Jul 27 2009, 10:33 AM Quote: but I do know the engine sat 20+ years in a wrecking yard The car is only 18yrs old. Did you put a much older engine in the car? That's what I was wondering..... my '88 Sprint is only 21 years old, . It did sit in a junkyard for 10 years per the inspection sticker before I got it. Its got the oil phart, but its only on deceleration.



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