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Unread 02-17-2013, 07:06 AM   #1
AVR2
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Blowing white smoke, but not losing coolant?

So I took my ZJ for its annual inspection, and it failed. The printout says it was blowing "white smoke". This surprised me; I know it's burning oil on idle and I still haven't got round to changing the valve stem seals, but to me, white smoke means that you're burning coolant, and as far as I can tell I'm not.

I completely overhauled the cooling system in the last year - new water pump, rad, hoses, T-stat housing and fan clutch, plus new freeze plugs after one started leaking. I check my coolant level at least once a week, and it never drops. So what's with the white smoke?

I had a look just now, and sure enough the smoke looks white, or maybe *very* light blue, but it certainly doesn't smell sweet - it's a full-on oil-burning smell.

Could a "stop smoke" oil additive cause white smoke as it got burned? I got persuaded into having one added last time I got my oil changed.

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Unread 02-17-2013, 07:20 AM   #2
Crazyhorse92284
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Doesnt sound to me like its coolant. If your loosing oil i bet the smoke is caused by unburned oil getting into your exhaust. That would cause a whitish blue smoke.
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Unread 02-17-2013, 07:58 AM   #3
PolkaPower
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Maybe oil getting past the rings?
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Unread 02-17-2013, 08:19 AM   #4
AVR2
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Quote:
Originally Posted by PolkaPower View Post
Maybe oil getting past the rings?
If only happens on idle, which AFAIK points primarily to the valve stem seals - I'll know for sure after I've changed them. My breather is bone dry with no blow-by oil, and I understand that blow-by is a symptom of oil getting past the rings.

It's the fact that the smoke is white that's had me confused, simply because I thought that white smoke always meant coolant in the exhaust, but I am 100% definitely not losing any coolant.
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Unread 02-17-2013, 04:38 PM   #5
Texas ZJ1
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Burning oil.....plenum gasket.

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Unread 02-17-2013, 05:08 PM   #6
PolkaPower
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Originally Posted by Texas ZJ1 View Post
Burning oil.....plenum gasket.

Hunter
That's what I thought initially too but he's got the 4. slow.

Is is possibly overfilled with oil? Could it be burning oil while driving but you only notice it while at idle? I'll be interested to know if the seals fix it.
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Unread 02-17-2013, 05:14 PM   #7
Texas ZJ1
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Yeah, those guys are always missing 2 cylinders....
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Unread 02-18-2013, 03:34 AM   #8
AVR2
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Quote:
Originally Posted by PolkaPower View Post
Is is possibly overfilled with oil?
Judging by the level when I checked the dipstick yesterday, no

Quote:
I'll be interested to know if the seals fix it.
Me too... just don't have the cash for a rebuild or replacement engine, and it needs to pass inspection soon
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