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My 92 xj, 136,000 MI smokes sometimes on start up and when idling for a while the smoke is white which means its oil but what could be causing this problem??? Any suggestions would be great Thanks. Sorry Admin.. please move this to OEM TECH thought i was in the correct forum
My 92 xj, 136,000 MI smokes sometimes on start up and when idling for a while the smoke is white which means its oil but what could be causing this problem??? Any suggestions would be great Thanks. Sorry Admin.. please move this to OEM TECH thought i was in the correct forum
amazing... thought it was the other way around... I just picked up a head gasket prior to this post... but the thing is ... does not eat up coolant at all... stays full all times.
burning water would make steam and a sweet smell in the exhaust..
my guess would be valve seals or piston rings..?
you can pull off the oil filler cap and see if you're getting excessive "blow by"
that would give an idea on the rings..
does it stop after a while??
if so I would lean more towards the valve seals
smell the exhaust and see if it smells "rich" with gas. may be something fuel related.
that way you will know for sure if it's gas, oil or coolant
If it's white smoke at startup after it's been sitting overnight, it's your value seals. You'll get a plumb of white smoke that will go away soon after startup, but may re-appear slightly when idling. Basically, oil sitting in the rocker area is seeping past the seals. Not sure if that fully describes your symptoms, but hope it helps.
If it's more like a steady amount of smoke all the time, it's most likely (as mentioned) your rings. A leak-down test will confirm.
If it's white smoke at startup after it's been sitting overnight, it's your value seals. You'll get a plumb of white smoke that will go away soon after startup, but may re-appear slightly when idling. Basically, oil sitting in the rocker area is seeping past the seals. Not sure if that fully describes your symptoms, but hope it helps.
You should probably worry enough to do a leakdown or compression test to make sure it's not the rings. If it isn't, then you really can decide on the basis of how much oil it burns and how often you have to clean the plugs. Valve seals can go on leaking just about forever without harm, but not without cost if you use oil.
But make sure your crankcase vent system is working properly. Check the little vacuum tube for sludge and clogs, cracked elbows, etc. It might help. The reason you get those clouds on the exit ramp is because this is when engine vacuum is highest, and it pulls oil in past leaky seals or rings. When the vent is working properly there's a little vacuum pulling the other way.
You should probably worry enough to do a leakdown or compression test to make sure it's not the rings. If it isn't, then you really can decide on the basis of how much oil it burns and how often you have to clean the plugs. Valve seals can go on leaking just about forever without harm, but not without cost if you use oil.
But make sure your crankcase vent system is working properly. Check the little vacuum tube for sludge and clogs, cracked elbows, etc. It might help. The reason you get those clouds on the exit ramp is because this is when engine vacuum is highest, and it pulls oil in past leaky seals or rings. When the vent is working properly there's a little vacuum pulling the other way.
I'm not burning any oil, nor do I have any leaks if thats helps any.
Ummm is the CCV the top elbow on the valve cover or the bottom one going to my intake box? (I have a little oil in the air box / filter... blow-by?) If its the top one, the line got disconnected from the elbow and I just jammed it back in...
Thank you for the explanation. Kind of a noob... where would I go to get a leak down or compression test besides the stealership??
The definitive test for valve seals is to get the engine good and warm. Pull into Burger King's drive through behind a half dozen cars. If it is the valve stem clearance/seals, it will be smoking like mad after a few minutes idling and waiting in line. It takes very little oil to smoke a lot with valve seals since when you are driving the vacuum is low, so it only smokes a lot when the trottle is closed, like decelerating getting off the freeway.
