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Old 01-12-2012, 04:28 PM
chrisnsarah's Avatar
chrisnsarah chrisnsarah is offline
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Join Date: Sep 24, 2000
Location: Nampa, ID
Posts: 3,282
grayish white exhaust smoke-need opinions

Or a diagnosis.
Started belching very light gray smoke about a week ago. It's not condensation because its still there after its fully warmed up. It doesnt smell like burning oil. I see it mostly while idling and it dissipates within 10ft of exiting the tailpipe. Doesn't smell like coolant, but it does emit water for a few min. I've put 300 mi since last week and oil and coolant levels are unchanged and look clean.
Today, I did a compression check. Pulled all plugs. All were normal except #1 cyl was wet and dark. All cylinders tested good except #1 gave me 20 psi. Yikes.
I then used my compression tester hose to pump up the cylinders at tdc. 7 of them held pressure-enough to push the truck forward while in gear (I had wheels blocked). #1 cyl wouldn't move the piston down, instead, the air came out the exhaust.
I'm guessing burned or broken valve. Would this cause the smoke? I've also noticed a misfire and mileage is slightly down.
'64 J200 thriftside
'67 J2000 townside custom cab
'68 Jeepster Commando
'69 Super Wagoneer
'75 J10
'79 Cherokee S WT
'75 Cherokee
'61 Aristocrat Lil Loafer
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Old 01-12-2012, 04:34 PM
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FSJunkie FSJunkie is offline
The Nigel Tufnel of the FSJ world.
Join Date: Jan 09, 2011
Location: Not The Hot Part, Arizona
Posts: 3,994
Yea, that sounds like an exhaust valve.
'72 Jeep Wagoneer Custom, 360 V8

I love how arguements end as soon as Ristow comments. Ristow is right...again.
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