Truck Just Started Smoking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1-PU70 · 04-13-2006, 08:18 PM

I was coming down the northway today and i noticed some smoke behind my truck but it wasent coming from mine. Then I noticed it a couple of mere times. Then I saw it come from the left exhoust when I took my foot off the gas. That is the only tome it does it. What do you think it is. It looks like its white and since its only coming frome one side I would rule out fuel. Man what a way to end a day.

derek · 04-13-2006, 08:24 PM

well i would say piston ring but the white smoke and taking your foot off then it smokes doesn't explain that. i'm stumped

matthufham · 04-13-2006, 08:24 PM

fuel in the exhaust would be my guess if it's just 1 side. did it sound different because you might have a bad spark plug, which will let raw fuel out and then it burns off the hot exhaust pipe instead of in the cylinder

*rage'nrat638* · 04-13-2006, 08:26 PM

bad head gasket

**68 Stepside** · 04-13-2006, 08:34 PM

My first thought was head gasket as well, but be sure to check everything else first.

1-PU70 · 04-13-2006, 08:43 PM

There is no change in power or fuel usage. It runs fine and idels smoothe. But I havent checked the water level yet.Oh ya its a 402 with about 40,000 miles on it. I had it rebuilt about 5 years ago.

Canadian72GMC · 04-13-2006, 11:32 PM

Valve guide seals or a worn valve guide. When you let off the throttle the engine vacuum goes very high, and literally sucks the oil past the guide and seal. The oil burns in the cylinder and you have smoke. Very easy to fix.

**VetteVet** · 04-14-2006, 12:11 AM

I've never seen oil smoke burn white. The transmission oil and the anti-freeze will burn white. I would suspect either a bad head gasket or an intake manifold gasket on the side that is smoking. Try re-torqueing the bolts on the intake manifold. Maybe they have loosened up.

thecatseye66 · 04-14-2006, 12:46 AM

ragenrat and Vettevet are right, IMHO
head gasket...

Jerry Jones · 04-14-2006, 01:06 AM

9 out of 10 white smoke on one side = head gasket.

1-PU70 · 04-15-2006, 04:29 PM

well its not trans fluid , im running a 700R4, no vacume to trans. Its hard to tell what coller the smoke is tinted windows and dirty mirors. White -gray couldnt tell if there is blue in it. Im thinking valve guide seals, had new guids put in when rebuilt. If it where head gasket wouldnt it afect the running of the motor or power? Dont know, thats why im here. Thanks for the input so far.

04-13-2006, 08:18 PM	#1
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Truck Just Started Smoking I was coming down the northway today and i noticed some smoke behind my truck but it wasent coming from mine. Then I noticed it a couple of mere times. Then I saw it come from the left exhoust when I took my foot off the gas. That is the only tome it does it. What do you think it is. It looks like its white and since its only coming frome one side I would rule out fuel. Man what a way to end a day. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

04-13-2006, 08:24 PM	#2
derek Registered User Join Date: Jan 2006 Location: fresno Posts: 6	Re: Truck Just Started Smoking well i would say piston ring but the white smoke and taking your foot off then it smokes doesn't explain that. i'm stumped

04-13-2006, 08:24 PM	#3
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	Re: Truck Just Started Smoking fuel in the exhaust would be my guess if it's just 1 side. did it sound different because you might have a bad spark plug, which will let raw fuel out and then it burns off the hot exhaust pipe instead of in the cylinder

04-13-2006, 08:26 PM	#4
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Truck Just Started Smoking bad head gasket

04-13-2006, 08:34 PM	#5
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	Re: Truck Just Started Smoking My first thought was head gasket as well, but be sure to check everything else first. __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

04-13-2006, 08:43 PM	#6
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Re: Truck Just Started Smoking There is no change in power or fuel usage. It runs fine and idels smoothe. But I havent checked the water level yet.Oh ya its a 402 with about 40,000 miles on it. I had it rebuilt about 5 years ago. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

04-13-2006, 11:32 PM	#7
Canadian72GMC Registered User Join Date: Mar 2005 Location: north battleford, sk Posts: 30	Re: Truck Just Started Smoking Valve guide seals or a worn valve guide. When you let off the throttle the engine vacuum goes very high, and literally sucks the oil past the guide and seal. The oil burns in the cylinder and you have smoke. Very easy to fix.

04-14-2006, 12:11 AM	#8
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Truck Just Started Smoking I've never seen oil smoke burn white. The transmission oil and the anti-freeze will burn white. I would suspect either a bad head gasket or an intake manifold gasket on the side that is smoking. Try re-torqueing the bolts on the intake manifold. Maybe they have loosened up. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

04-14-2006, 12:46 AM	#9
thecatseye66 '68 C-20 396 CST CC Join Date: Mar 2005 Location: Spokane, WA Posts: 454	Re: Truck Just Started Smoking ragenrat and Vettevet are right, IMHO head gasket... __________________ 68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES 01 Jetta Turbo Daily Driver 84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico

04-14-2006, 01:06 AM	#10
Jerry Jones Happy Camper Join Date: Feb 2006 Location: Northern California Posts: 8,408	Re: Truck Just Started Smoking 9 out of 10 white smoke on one side = head gasket. __________________ RIP El Jay! Love you brother!

04-15-2006, 04:29 PM	#11
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Re: Truck Just Started Smoking well its not trans fluid , im running a 700R4, no vacume to trans. Its hard to tell what coller the smoke is tinted windows and dirty mirors. White -gray couldnt tell if there is blue in it. Im thinking valve guide seals, had new guids put in when rebuilt. If it where head gasket wouldnt it afect the running of the motor or power? Dont know, thats why im here. Thanks for the input so far. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

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