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Old January 4th, 2017, 10:03 PM   #1
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burning oil

04 v6 manual coupe. Burns oil about half a quart in under 1000 miles.i have full exhaust pcd xlr8 jpipe n tsudo catback. The black residue on bumper is normal from no cats. But for the amount it burns , theres no leak or very bad residue on bumper nor does is smoke under hard acceleration. Inside muffler tip is just regular black soot when u smear it, no thickening or buildup. My plugs are cover in black soot with the tip a slight whitish color. Coolant level is same.

I do smoke upon cold start up but thats just probably condensation from cold then disappears. I do remember that when i did my valve adjustment 2000 miles ago, the texture on the valve stem seals looks rough or dried up but i didnt pay close attention. Car still pulls strong up top but not much low end trq and lags for power in lower rpms until 4k rpms.

Also i notice i f***k on this one switching to mobil 1 semi or fully snthetic too. That could be my problem too. So i was planning to switch to 5w-30 valvoline conventional to see how it goes first.

I know im suppose to do a compression test. Maybe after my new conventional oil.
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Old January 4th, 2017, 11:13 PM   #2
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Could be piston rings. Compression test will tell you. Which do they look like in the link? http://www.aa1car.com/library/reading_spark_plugs.jpg

https://www.google.com/url?sa=i&rct=...83679590372456
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Old January 5th, 2017, 01:12 AM   #3
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But burning oil that much in less than 1000 miles should result it some black puffy clouds upon start up and especially when i floor it redline too. I had my bro followed me one time and i floored it and asked him later if he saw any smokes, he said no.

Anyways my spark plug looks similiar to the link below, its very black and dry soot(no thick layers buildup), and the tip is slight whitish brown. Its not fully white tho. I forgot, my 02 sensor has white buildups over the black carbon on it.https://www.google.com/search?q=whit...iw=360&bih=561
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Old January 5th, 2017, 01:14 AM   #4
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Idk if the link works but if u google white spark plug on google image its similiar to that but not that white tho with black dry soot around the threads.
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Old January 5th, 2017, 01:15 AM   #5
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Could my 02 sensor be lazy too, the cause for my lag or slow pickup speed around 2-4k rpms.like it bogs.i think im running rich too from the full exhaust setup, i would smeel the richness upon startup i know it smells bad with no cat but its almost extre unburn air fuel. And when im cruising n let go it backfsfire or makes a pop or two when running rich right.

My hwy mpg is decent tho 27-30 mpg and 17-23 mpg city.
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Old January 5th, 2017, 08:00 AM   #6
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What's the status of your pcv system? Do you have a factory setup or any breather filters? Pcv valve still good?
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Old January 5th, 2017, 04:41 PM   #7
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Oh i just change to a new oem pcv when i got the car 2000 miles ago. Are they suppose to rattle or blow in it or how do u test it. I read that it doesnt really rattle.
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Old January 5th, 2017, 04:42 PM   #8
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I put a Small breather filter in place of where the line from valve cover to intake tho if that makes difference cuz didnt want ti dril hole for intake.
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Old January 5th, 2017, 06:33 PM   #9
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It sounds like the things you have said check out fine. (Plugs, o2, exhaust tips, and smoke) pics of the plugs would be the easiest, if ur burning that much oil it should show up on the plugs, after that a compression test would b nice. Try going back to conventional and see what happens. You really should have vac applied to that rear valve cover, it's the fresh air intake side for the pcv system, and while I can't say what happens without it, I know it will prob work better to get the pcv system "flowing" the way it was designed.
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Old January 5th, 2017, 10:28 PM   #10
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Ill get back after an oil. Hange to see how it is. Might not be till a month or two.
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