Grayish-white exhaust smoke... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

texascowboy593 · 12-16-2005, 08:23 PM

Now that the oil is changed (finally), I fired ol Project Mayhem up for a couple of mins. after I turned her off there was this smoke slowly lingering out of the tailpipes for 5-6 mins. It had done this b4 the oil change. When running, she smells like a lawnmower. Pretty rank. The grayish-white smoke comes out during runtime as well... What do yall think Im dealing with here?
Worn rings? Engine runs smooth as silk and very quiet... Hmmmm

The pics show the pass. side tailpipe after engine is off... You can kinda see the smoke lingering out of there...

Sweet72 · 12-16-2005, 10:22 PM

Have you noticed a loss of coolant? If so it could be coolant entering a cylinder and making it's way into the muffler. Take the radiator cap off and start the engine, if you notice bubbles in the coolant you probably have a blown head gasket or worse cracked head or block. These are worst case scenario, it may be nothing to worry about... When you say it "smells like a lawnmower" do you mean it smells like unburned fuel, sounds like it needs a tune up? Good luck.

NPilot1975 · 12-17-2005, 01:18 PM

If it is white it is water, if it is blue-ish it is oil. If you think it is the oil, you can run Lucas oil treatment. I had a friend with a diesel that was having blue smoke. I added the Lucas to his truck about 3 yrs ago and he has had no problems with it since.

cdowns · 12-17-2005, 01:26 PM

if you're only running for a few minutes chances are it's just the engine burning of the condensation inside the exhaust and cylinders fron sitting// also in some areas gas companies have additives that will cause this type of smoke// best is a long run over the road to get to operating temp

bigvinnie · 12-17-2005, 01:20 PM

if it's pumping out white smoke while you're driving down the road after it's all warmed up, you've got water entering one or more of your combustion chambers like the previous poster stated... check your dipstick for chocolate milk.

think of it as getting your exhaust system steam cleaned for free...

12-16-2005, 08:23 PM	#1
texascowboy593 Registered User Join Date: Dec 2004 Location: Southeast Tx Posts: 1,302	Grayish-white exhaust smoke... Now that the oil is changed (finally), I fired ol Project Mayhem up for a couple of mins. after I turned her off there was this smoke slowly lingering out of the tailpipes for 5-6 mins. It had done this b4 the oil change. When running, she smells like a lawnmower. Pretty rank. The grayish-white smoke comes out during runtime as well... What do yall think Im dealing with here? Worn rings? Engine runs smooth as silk and very quiet... Hmmmm The pics show the pass. side tailpipe after engine is off... You can kinda see the smoke lingering out of there... Attached Images __________________ "The rays of light thru the Shiner Bock bottle make me wanna turn the key and put down the throttle...and get lost down 35" - Jason Boland www.YouTube.com/user/593Films - Watch My Videos! 1977 Silverado K10 2014 Dodge Durango (Wife-mobile) 2008 Dodge Ram Lone Star Edition (Daily driver) Last edited by texascowboy593; 12-16-2005 at 08:24 PM.

12-16-2005, 10:22 PM	#2
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	Re: Grayish-white exhaust smoke... Have you noticed a loss of coolant? If so it could be coolant entering a cylinder and making it's way into the muffler. Take the radiator cap off and start the engine, if you notice bubbles in the coolant you probably have a blown head gasket or worse cracked head or block. These are worst case scenario, it may be nothing to worry about... When you say it "smells like a lawnmower" do you mean it smells like unburned fuel, sounds like it needs a tune up? Good luck. __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction. Last edited by Sweet72; 12-16-2005 at 10:23 PM.

12-17-2005, 01:18 PM	#3
NPilot1975 Senior Member Join Date: Aug 2002 Location: Plymouth, MA Posts: 891	Re: Grayish-white exhaust smoke... If it is white it is water, if it is blue-ish it is oil. If you think it is the oil, you can run Lucas oil treatment. I had a friend with a diesel that was having blue smoke. I added the Lucas to his truck about 3 yrs ago and he has had no problems with it since. __________________ 1972 Blazer body...need to get a thread started for the rest of the story

12-17-2005, 01:26 PM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Grayish-white exhaust smoke... if you're only running for a few minutes chances are it's just the engine burning of the condensation inside the exhaust and cylinders fron sitting// also in some areas gas companies have additives that will cause this type of smoke// best is a long run over the road to get to operating temp __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-17-2005, 01:20 PM	#5
bigvinnie Registered User Join Date: Aug 2001 Location: escondido, ca 92026 Posts: 1,222	Re: Grayish-white exhaust smoke... if it's pumping out white smoke while you're driving down the road after it's all warmed up, you've got water entering one or more of your combustion chambers like the previous poster stated... check your dipstick for chocolate milk. think of it as getting your exhaust system steam cleaned for free... __________________ '72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA 72 Stepside Project



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