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Unread 07-04-2012, 10:41 AM   #1
sens
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2002 KJ Liberty 
 
Join Date: May 2012
Posts: 20
Burning Oil

Hi guys, got a few quick questions.

I seem to be burning a bit of oil, and my little brother has told me there is a small amount of smoke from the exhaust, a little whiteish maybe.

What oil should I be adding? Is it 5w30?

I'll check my coolant in a second, apart from that how do I check the PCV valve, what is it I'm actually looking for on it. Or do I just replace it?

I'm hoping it's just the PCV valve and my sometimes heavy right foot burning oil.

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Unread 07-04-2012, 11:31 AM   #2
streetglideok
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2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,415
Honestly, its hard to do an accurate test of a pcv valve. Taking it out and shaking it, as some will say to do, will not tell you anything, except that the plunger inside rattles. It doesn't tell you if the spring inside is controlling flow thru it properly, or if it is keeping oil from going past it. Its a cheap part, replace it if in doubt. How often do you change your oil and what are you using exactly, brand, synthetic or conventional, etc?
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Unread 07-04-2012, 12:17 PM   #3
tjkj2002
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2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,114
White smoke out the tail pipe is burning coolant,best to do a block test before anything else if the coolant is a little low(Napa has easy DIY kits).Other then that it's $5-$6 for a new PCV valve,push and turn for removal.
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Unread 07-04-2012, 12:56 PM   #4
sens
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2002 KJ Liberty 
 
Join Date: May 2012
Posts: 20
It's my first jeep (my first own transport) and I've had it for 4 weeks so I don't know what any of it's history is like.
The coolant isn't low, I didn't know how to check it as it says it's pressurised, is it Ok to check it once it's fully cooled down?

From reading around it could just be that it needs to be topped up every now and again, I saw that it was low on oil when I bought it and it's done 1000 miles since then. Just the white smoke which is worrying, I might take a video and put it up.
I plan on topping up just with a bottle of Castrol from the nearest garage. 500ml at a time, leave it a few minutes and check the level again.
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Unread 07-05-2012, 04:30 AM   #5
sens
Registered User
2002 KJ Liberty 
 
Join Date: May 2012
Posts: 20
Popped some more oil in.
Can't get the PCV valve off, there are 2 metal pipes which it hits on, am I doing it wrongly? Pulled the pipe off and there was oil in there, just a trickle but is that normal?

Got a code to tell me my post catalytic converter O2 sensor has died. When ordering a new one does it matter which one I get? Surely they are all interchangeable?
Also, I'm having trouble finding one for a liberty (Cherokee in the Uk) but I can find out for a grand Cherokee (don't know what that is abroad). If its still for a 3.7 v6 is it interchangeable?

Thanks for any help!
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Unread 07-05-2012, 10:13 AM   #6
jklanier84
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2002 KJ Liberty 
 
Join Date: Sep 2011
Location: Orlando, Florida
Posts: 201
Twist the pcv harder. Its a crap design, but it'll come off just twist it past the a/c lines.
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