Help! 4.7 190k White Smoke from exhaust! - JeepForum.com
 
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post #1 of 6 Old 08-20-2017, 09:06 PM Thread Starter
dangerzone500
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Question Help! 4.7 190k White Smoke from exhaust!

Hi, I have an 00' 4.7 with 191,000 on the odometer. Recently I pulled into my driveway and noticed smoke blow past my window from the back of the jeep when I stopped, so I got out and walked to the back and noticed a pretty decent amount of white smoke coming out of the tailpipe. (It is currently around 90 degrees F where I live and the engine was at operating temp.) I have also noticed that it doesn't seem to smoke when the engine is cold, only after driving for at least 10 minutes or getting up to operating temp and staying there for a bit. I recently had my Valve Cover Gaskets replaced also. (Doubt that has anything to do with it but I thought I would throw that out there just in case.) I believe it to be either burning coolant, blow by, or maybe a bad head gasket but I don't know. It starts just fine and it drives/idles just fine as well. There is no smoke coming out of the engine, just the exhaust pipe. Any suggestions as to what it could be are appreciated! Thanks!

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post #2 of 6 Old 08-20-2017, 09:11 PM
Moses2564
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Head gasket. Blow-by, or oil bypassing worn piston rings usually through a cylinder taper, typically causes black exhaust. Check your oil, if it's milky, head gasket. Also, when the engine is cold, pull off the radiator cap and check for oil deposits in the opening and on the lip of the fill tube. These are both pretty good indications of a bad head gasket.

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post #3 of 6 Old 08-20-2017, 09:57 PM
Squarecat
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Help! 4.7 190k White Smoke from exhaust!

You could get your oil tested by Blackstone Labs.

My 2004 WJ had white puffs on warm startup a couple times last year right after I got it. I read about the 4.7 head gaskets (mine's an HO, FWIW) but frankly, I didn't do anything more about it. Oddly enough it never reoccurred.

I finally sent in an oil sample for testing earlier this summer and luckily it came back negative for any coolant.

Anyway, the point is even if you aren't as fortunate to dodge a bullet, at least you can know definitively what's chemically going on with your engine.


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post #4 of 6 Old 08-20-2017, 11:22 PM Thread Starter
dangerzone500
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Quote:
Originally Posted by Moses2564 View Post
Head gasket. Blow-by, or oil bypassing worn piston rings usually through a cylinder taper, typically causes black exhaust. Check your oil, if it's milky, head gasket. Also, when the engine is cold, pull off the radiator cap and check for oil deposits in the opening and on the lip of the fill tube. These are both pretty good indications of a bad head gasket.
Ok, thanks. I will check tomorrow.
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post #5 of 6 Old 08-20-2017, 11:26 PM Thread Starter
dangerzone500
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Quote:
Originally Posted by Squarecat View Post
You could get your oil tested by Blackstone Labs.

My 2004 WJ had white puffs on warm startup a couple times last year right after I got it. I read about the 4.7 head gaskets (mine's an HO, FWIW) but frankly, I didn't do anything more about it. Oddly enough it never reoccurred.

I finally sent in an oil sample for testing earlier this summer and luckily it came back negative for any coolant.

Anyway, the point is even if you aren't as fortunate to dodge a bullet, at least you can know definitively what's chemically going on with your engine.


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Yeah, if I don't end up finding out the cause, I will try that. Thanks!
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post #6 of 6 Old 08-21-2017, 01:48 AM
sdg3205
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Run a pressure test. If it doesn't hold pressure and you can't see any leaks, its probably dissipating into the combustion chamber.
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