smoke - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68gmcjon · 05-20-2002, 03:35 PM

When i'm just going down the street my truck smokes, it's not that bad but i just wonder if it's normal or not.

**COBALT** · 05-20-2002, 03:37 PM

1. What color is the smoke.

2. Is it out both pipes or just one.

3. Is it all the time, or only under acceleration? What about heavy loads like driving up a steep hill?

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!

68gmcjon · 05-20-2002, 08:21 PM

blueish color
when accelerating

**COBALT** · 05-20-2002, 11:28 PM

Sounds like you're burning oil.

Your head(s) may need valve work. Valves seals are letting oil into the cumbustion chamber, and is burning up with the fuel. That involves pulling the head and taking it somewhere to have it done unless you know how, or you get a new head.

The other thing could be that your rings in your pistons are not sealing right to the cylinder wall, and oil is being thrown up from the crank. I don't know if this could even happen, but if it were the case then you'd be loosing compression on the offending cylinders, which means you'd be loosing power.

Come to think of it if it's happening on acceleration then your valves are probably the culprit. Highest compression and highest oil pressure...

I guess I'm assuming this is a V8, but is it a straight 6? If not then is the smoke comming out both tailpipes?

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!

*Zkast* · 05-20-2002, 11:35 PM

Pull the plugs and note the condition of each one and where it came from. Pay close attention to the back 4 cylinders if its a V8.

You'll be able to tell alot of whats going on by how the plugs look. If you see a suspicous looking plug, take a shot of it and post it

------------------
Pictures and more...
piston@zkast.com
'71 LWB
350/350T, PS/PB
Special options? Yes, RUST... Need some?
------------------------------------------
Webmaster/Team owner
www.zkast.com
Garrett - Olathe, Kansas

SWINGSAX68 · 05-20-2002, 11:52 PM

These guys are right.....and/or the heads must be in need of a good machining. Have the pistons checked in the block (I think thats what they are called). The heads of the Pistons may be worn. This would then lead to an overhaul, like my 307. But then I don't know a whole lot, so go to these other guys for more detailed advise.

------------------
IN A TUX WITH A 68 BOWTIE.

*SELLING FOR PARTS*
"P.O.S" Stepside 68, Primed from Fl., rusted out a bit, but
*SELLING FOR PARTS*
Interested? E-mail me!!

"Rusty" Stepside 68 Brown/Black (not by choice, soon to be charcoal grey)
This is my baby, just put in wood bed.
Overhauled 307.
Just needs the brakes to be redone then its ready to run.

Oh yeah, My girlfreind's got a 63 named "Blue Boy"

dmnall · 05-21-2002, 12:59 AM

Could be that your Valve Seals are worn out but if you are going to take your heads off you might as well have New Valve Guides and have a complete valve job done to the heads. Also before you do pull the heads, check to make sure that your plugs are not fauled and then also do a compression check because if you are going to take the heads off, you might as well (depending on how many miles is on your block) do new rings and bearings!!

------------------
Truck #1 68 Chev LWB Fleet w/ Wood Floor (Sucks Gas and Hauls Ass!) and in process of Body Work...

Truck #2 1994 GMC Sierra SL w/ 4.3L Vortec V6, 4L60E Auto!!

05-20-2002, 08:21 PM	#3
68gmcjon Got earplugs? Join Date: Mar 2002 Location: Winfield, Kansas Posts: 556	blueish color when accelerating __________________ 1968 GMC Original A/C, bucket seats, PS,PB 396 bored to 402, Dynomax cerama-coat headers, Super 40 Flowmasters, 272/284 Crane cam, Crane gold roller rockers, holley 750 cfm double pumper, Edelbrock Performer RPM intake, HEI ignition, 9.5:compression Alltogether 411HP and 446ft/lbs Dana 60 w/ 3.54 gears Turbo 400 tranny Why would you have anything other than a big block? HAHA

05-20-2002, 11:28 PM	#4
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Sounds like you're burning oil. Your head(s) may need valve work. Valves seals are letting oil into the cumbustion chamber, and is burning up with the fuel. That involves pulling the head and taking it somewhere to have it done unless you know how, or you get a new head. The other thing could be that your rings in your pistons are not sealing right to the cylinder wall, and oil is being thrown up from the crank. I don't know if this could even happen, but if it were the case then you'd be loosing compression on the offending cylinders, which means you'd be loosing power. Come to think of it if it's happening on acceleration then your valves are probably the culprit. Highest compression and highest oil pressure... I guess I'm assuming this is a V8, but is it a straight 6? If not then is the smoke comming out both tailpipes? ------------------ '69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed! '69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast). Seattle, WA. *See pics of my trucks and project at www.webshots.com! __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

05-20-2002, 11:52 PM	#6
SWINGSAX68 Now the others dig........ Join Date: May 2002 Location: San Antonio, TX Posts: 1,520	These guys are right.....and/or the heads must be in need of a good machining. Have the pistons checked in the block (I think thats what they are called). The heads of the Pistons may be worn. This would then lead to an overhaul, like my 307. But then I don't know a whole lot, so go to these other guys for more detailed advise. ------------------ IN A TUX WITH A 68 BOWTIE. SELLING FOR PARTS "P.O.S" Stepside 68, Primed from Fl., rusted out a bit, but SELLING FOR PARTS Interested? E-mail me!! "Rusty" Stepside 68 Brown/Black (not by choice, soon to be charcoal grey) This is my baby, just put in wood bed. Overhauled 307. Just needs the brakes to be redone then its ready to run. Oh yeah, My girlfreind's got a 63 named "Blue Boy" __________________ 68 Chevy C10 Stepside Black Primer 78 GMC Longbed White 09 Chevy Silverado Shortbed Granite Blue *LOOKING FOR A 67 4 DOOR IMPALA!!!Just like Sam and Dean Winchester!! 'Cause Mustangs are for p^#$ and you can fit a body in the trunk of a 67 Impala* MEMBER OF THE DRUM BRAKE CLUB Bachelor of Music in Jazz Studies Texas State University-San Marcos, TX Certified Music Educator I hope Mom is up there watching and being my Guardian Angel "I've got a fever.....and the only prescription.....IS MORE COW BELL" -The Legendary: Bruce Dickenson "F#$@ 'em up!!!!!!" -The Legendary: Rogelio Escobar TRUCKY LINKS** http://67-72chevytrucks.com/vboard/s...d.php?t=457750 http://67-72chevytrucks.com/vboard/s...d.php?t=461184 http://67-72chevytrucks.com/vboard/s...d.php?t=472848 http://67-72chevytrucks.com/vboard/s...d.php?t=417541 http://67-72chevytrucks.com/vboard/s...d.php?t=477788

05-21-2002, 12:59 AM	#7
dmnall Registered User Join Date: Apr 2001 Location: Goleta, CA Posts: 505	Could be that your Valve Seals are worn out but if you are going to take your heads off you might as well have New Valve Guides and have a complete valve job done to the heads. Also before you do pull the heads, check to make sure that your plugs are not fauled and then also do a compression check because if you are going to take the heads off, you might as well (depending on how many miles is on your block) do new rings and bearings!! ------------------ Truck #1 68 Chev LWB Fleet w/ Wood Floor (Sucks Gas and Hauls Ass!) and in process of Body Work... Truck #2 1994 GMC Sierra SL w/ 4.3L Vortec V6, 4L60E Auto!! __________________ 1968 C10 Truck LWB Fleetside 1968 C10 Truck SWB Stepside 1994 K2500 Ext Cab Fleetside 2008 Honda Civic Si lease

05-20-2002, 03:35 PM	#1
68gmcjon Got earplugs? Join Date: Mar 2002 Location: Winfield, Kansas Posts: 556	smoke When i'm just going down the street my truck smokes, it's not that bad but i just wonder if it's normal or not. __________________ 1968 GMC Original A/C, bucket seats, PS,PB 396 bored to 402, Dynomax cerama-coat headers, Super 40 Flowmasters, 272/284 Crane cam, Crane gold roller rockers, holley 750 cfm double pumper, Edelbrock Performer RPM intake, HEI ignition, 9.5:compression Alltogether 411HP and 446ft/lbs Dana 60 w/ 3.54 gears Turbo 400 tranny Why would you have anything other than a big block? HAHA

05-20-2002, 03:37 PM	#2
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	1. What color is the smoke. 2. Is it out both pipes or just one. 3. Is it all the time, or only under acceleration? What about heavy loads like driving up a steep hill? ------------------ '69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed! '69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast). Seattle, WA. *See pics of my trucks and project at www.webshots.com! __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

05-20-2002, 11:35 PM	#5
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	Pull the plugs and note the condition of each one and where it came from. Pay close attention to the back 4 cylinders if its a V8. You'll be able to tell alot of whats going on by how the plugs look. If you see a suspicous looking plug, take a shot of it and post it ------------------ Pictures and more... piston@zkast.com '71 LWB 350/350T, PS/PB Special options? Yes, RUST... Need some? ------------------------------------------ Webmaster/Team owner www.zkast.com Garrett - Olathe, Kansas



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