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Unread 12-04-2010, 10:57 AM   #1
BamaXJ
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White smoke from exhaust.. completely baffled!

Okay, so Friday I took my XJ to the oil change shop to get the oil changed and the transmission fluid changed. They also dropped the oil pan, cleaned it off, put on a new rubber gasket, and put it back on.

An hour after driving away I noticed I had white smoke coming from my exhaust. When I would stop at a red light, immediately after takeoff I have more and more white smoke coming out from the exhaust.

I took it back to the Oil Change Center to get it looked at because it's never smoked before, and they were no help. They switched out the oil filter again and no good.

So, I took it to three other shops around town (Saturday, so not a lot of places are open today) and they all tell me they can't do it.

So basically, here's what I've gathered from this:
-- White smoke from exhaust
-- Checked oil level, they are full.
-- Ran the "No Smoke" stuff from AutoZone through the crankcase. Let it idle and revved it for about five minutes. No good.
-- As far as I can tell, there's no oil leaking anywhere.

I'm baffled, does anybody have any suggestions or maybe an answer? It's driving me crazy and I can't drive it because around here if your exhaust spews a ton of smoke you can get a ticket for it.

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Unread 12-04-2010, 11:01 AM   #2
TjinTopeka
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Blown head gasket?
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Unread 12-04-2010, 11:04 AM   #3
BamaXJ
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I actually had that guy from AutoZone suggest that I replace the head gasket so I bought a new one. I've never taken the valve cover off, so how hard is it to replace?
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Unread 12-04-2010, 11:42 AM   #4
Empty_Pockets
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Hahaha your ganna need more than the head gasket for that job. Intake/exhaust, and valve cover gasket are also gonna need to be replaced, if your not comfortable working on motors I wouldnt suggest you do it yourself. Its a big job and there are alot of things that could go wrong if not done properly, then your gonna have to do it again. Have you ever overheated it? Also pull your spark plugs and see if any of them look green like theyve had coolant on them. Could also be a cracked head. How many miles are on the motor?
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Unread 12-04-2010, 11:50 AM   #5
cruiser54
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Does the white smoke smell sweet? How's your coolant level doing?
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Unread 12-04-2010, 12:25 PM   #6
BamaXJ
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I actually had the coolant cap burst off and coolant leaked everywhere. I have to flush and refill the system. .There is 177k miles on the motor. I won't be able to do the head gasket because I don't have a torque wrench. Other than that it has overheated once or twice in a two year span, but I just replaced the plugs last week. I'm running that "Smoke Stop" stuff or whatever it's called from AutoZone and it's seemed to not have so much smoke right now but it is still smoking nonetheless. How does that stuff work? Does it require me idling it for a while?
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Unread 12-04-2010, 12:27 PM   #7
TjinTopeka
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THat stuff is probably more for smoke caused by burning oil.
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Unread 12-04-2010, 12:42 PM   #8
BamaXJ
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Now that I'm thinking about it. I had the engine bay steam cleaned at the car wash the other day. They were hesitant to do it because the PCV valve was loose and were afraid to get water in it, but they did it anyways. If water got in, is this a bunch of water burning off or is this even a factor?
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Unread 12-04-2010, 12:42 PM   #9
tjwalker
It's the crank sensor!
 
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Blue smoke is generally oil

White smoke can be "coolant".......

If it is smoking a lot, the fluid that is burning off will DROP. Keep an eye on your coolant reservoir.

You could perform a "block test", which may yield a clue. It detects the presence of hydrocarbons (oil) in your coolant. It "sniffs" the coolant. NAPA offers a do-it-yourself test kit, but any reputable shop would know how to do this as well.

A compression test would also be in order here. If you get low readings on two adjacent cylinders, that oftentimes indicate a blown head gasket.

TEST your way to a solution here....
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Unread 12-04-2010, 02:11 PM   #10
BamaXJ
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I can not for the life of me figure it out. I'm going to have to get it to a mechanic on Monday. Any idea how much I'm looking at?
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Unread 12-04-2010, 06:27 PM   #11
tjwalker
It's the crank sensor!
 
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Quote:
Originally Posted by BamaXJ View Post
I can not for the life of me figure it out. I'm going to have to get it to a mechanic on Monday. Any idea how much I'm looking at?
Completely impossible to estimate as you don't know root cause. Hope for the best.
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Unread 12-04-2010, 07:19 PM   #12
stargate3d
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The price for repairing the head gasket (which it sounds like it may be) can be any where from 600 – 1400 USD. This includes the cost of the parts, and the labor cost. The labor costs are high because of the complexity of the entire procedure and also the time required to complete it.
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Unread 12-04-2010, 08:32 PM   #13
dukie564
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white "smoke" is either coolant, or just condensation/moisture in the exhaust system
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Unread 12-04-2010, 09:18 PM   #14
GregB_00XJ
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Quote:
Originally Posted by dukie564 View Post
white "smoke" is either coolant, or just condensation/moisture in the exhaust system
Generally, and from my experience "white" is coolant...aka blown head gasket or a cracked head usually. Been there done that on a few cars in the past.

Hope I am wrong.
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Unread 12-04-2010, 09:22 PM   #15
LilyBayXJ
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Sounds like a bad head gasket to me, my XJ was experiencing the exact same symptoms... it was the head gasket.
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