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Old 09-12-2005, 07:10 PM   #1
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Exclamation Blue smoke coming out of exhaust?

There is blue smoke coming out of my exhaust. We ran a compression test and the compression in all cylinders was fine. Anyone have a clue of what it could be.
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Old 09-12-2005, 07:31 PM   #2
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blue smoke is burning oil......
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Old 09-12-2005, 07:44 PM   #3
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Quote:
Originally Posted by yotasound
There is blue smoke coming out of my exhaust. We ran a compression test and the compression in all cylinders was fine. Anyone have a clue of what it could be.
Valve guides or rings are worn out and your burning oil like Bean said.
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Old 09-12-2005, 07:48 PM   #4
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good compression might indicate valve seals need replacing.
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Old 09-12-2005, 08:55 PM   #5
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My compression ratio for all the cylinders was 190. Every one I have spoken to said they thought it might have been rings or seals until we ran the compression test. Blue smoke indicates rich fuel. Black smoke is burninig oil. My gas mileage has gone to ลลลล and is about 5-10 mpg. leaning more towards the 5 mark. I changed my oxygen sensor but that didn't help.
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Old 09-12-2005, 09:31 PM   #6
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Quote:
Originally Posted by yotasound
Blue smoke indicates rich fuel. Black smoke is burninig oil.
uh i think your a little mixed up blue smoke can mean its rich but usally means is burning oil. black smoke is fuel
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Old 09-12-2005, 10:03 PM   #7
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A compression check only checks the 2 top rings (compression rings) it does not check the oil control rings (bottom one). You are definitly burning oil. Make sure your PCV system isn't plugged. Depending on mileage, probably a combo of worn valve seals/guides and/or seized oil control rings.

Last edited by tabb; 09-14-2005 at 08:01 PM.
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Old 09-14-2005, 07:41 PM   #8
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you really need to do a leakdown test, that will tell you the condition of the oil rings.
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Old 09-14-2005, 08:01 PM   #9
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Originally Posted by 91RN81
you really need to do a leakdown test, that will tell you the condition of the oil rings.
Leakdown tests only pinpoint the source of cylinder leaks ie: valves, head, head gasket or compression rings..... Since the oil control rings don't seal (they only scrape the excess oil off the cylinder walls) and the valve seals and valve guides are not located inside the combustion chamber, neither a compression or leakdown test will diagnose oil burning.

I think the only thing/tool that can diagnose oil burning is a vacuum gauge. Don't ask me how 'cause I can't remember. I've heard of old school guys doning it but have never done it myself. Like I said before, depending on mileage it may be several things.

From past experience, unless you've got the tools to replace the valve seals "head on car", then you will be ripping the head(s) off and tearing the head down on the bench. In this case it's really only a little more work to pull the oil pan and pistons to replace the rings and hone (deglaze) the cylinders. You can leave the block and crank in the car. Just make sure to do a very good job cleaning.

If you want to go all out, you can re&re the entire engine and get it bored to the next oversized spec and install oversized pistons. In this case I would recommend you have the cylinders machined as close to the min spec of the next oversize as possible (closer oil control ring clearances). If when you replace the valve seals and they do not seem to be very hard or brittle, then I would have a look at the guides. They may be excessivly worn.

On a low mileage engine you can get away with only valve seals. On a high milege motor, doing both rings and seals is advisable. The rule of thumb is when you fix the weakest point, the next weakest part is not far behind to go.

Check your PCV system to start , make sure it's not plugged and make sure your oil level is not overfilled before you spend any money on more costly repairs. Also have a look at your airbox and intake air tube for oil/blow-by.

Last edited by tabb; 09-14-2005 at 08:22 PM.
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Old 09-14-2005, 08:10 PM   #10
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Bad valve seals or guides, though more likely the seals as you've not posted anything about hearing any "rattling" from the top end of your engine.

Last edited by 94x4; 09-14-2005 at 08:12 PM.
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Old 09-14-2005, 08:11 PM   #11
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Quote:
Originally Posted by 94x4
Bad valve seals or guides.
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Old 09-26-2005, 06:36 PM   #12
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blue smoke

Quote:
Originally Posted by yotasound
There is blue smoke coming out of my exhaust. We ran a compression test and the compression in all cylinders was fine. Anyone have a clue of what it could be.
First off, what kind of engine oil are you using? Second of all, how often are you changing your oil? Third have you ever considered using AMSOIL products. I ususally get around 20,000 to 30,000 miles on 1 oil change and I am covered by a warranty. My truck gets around 27-29mpg and it has 156,100 miles on it. What kind of truck do you have and what year is it?
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Old 09-26-2005, 06:53 PM   #13
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amsoilking,

i would say that the vast, vast majority of the forum member are aware and knowledgable about amsoil products, so you can chill out with the hard sales pitch. in fact, there are other independent amsoil dealers (which is the correct way to present yourself to customers, per amsoil terms of agreement) on the forum too.

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Old 09-29-2005, 04:15 PM   #14
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Quote:
Originally Posted by tabb
Leakdown tests only pinpoint the source of cylinder leaks ie: valves, head, head gasket or compression rings..... Since the oil control rings don't seal (they only scrape the excess oil off the cylinder walls) and the valve seals and valve guides are not located inside the combustion chamber, neither a compression or leakdown test will diagnose oil burning.
Huh? It can't? Actually it can. Using the tester you can see the percentage of leakage from where the air is coming from. If you have a lot of air coming out of the dipstick or the crankcase, over 10%, then you have worn rings. If you have very little leakage, say around 5%, then this is normal. Cylinder leakage test is the BEST tool out there. If you have under 10% leakage on all cylinders and you are still burning oil then odds are the valve seals and valve guides. It can still be oil rings but you would most likely have low compression cause usually oil rings wear at the same rate as the piston rings do.

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Old 10-01-2005, 08:12 AM   #15
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Quote:
Originally Posted by AMSOILKing
First off, what kind of engine oil are you using? Second of all, how often are you changing your oil? Third have you ever considered using AMSOIL products. I ususally get around 20,000 to 30,000 miles on 1 oil change and I am covered by a warranty. My truck gets around 27-29mpg and it has 156,100 miles on it. What kind of truck do you have and what year is it?
Yeah, thats his problem. Hes not running Amsoil!! We are so dumb not to have thought of that /sarcasm off. Post like this is why i'll never fall into this amsoil hype. Seems like everyone who swears by it is either selling it or very unknowledgeable

.....

Anyway, when does it blow the blue smoke? If its only on start up chances are its the seals.

Last edited by CynicX; 10-01-2005 at 08:14 AM.
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Old 07-23-2011, 09:50 PM   #16
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Wow old thread. First time poster long time reader. I have a 86 22re I'm having similar issues and waiting for a leak down test. Does anyone know how it turned out for these guys. A re-ring kit from engnbldr is only like a 100 bucks could this work if its not to bad. I appreciate all coments
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Old 07-23-2011, 09:50 PM
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