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

glljr · 10-15-2011, 11:02 AM

Have a 71 350 smoke comes in cab under hard acceleration, not sure where to start looking to fix problem?

longbed67 · 10-15-2011, 11:06 AM

Open the hood, rev it up by hand and take a look to see where you have a leak...and what color is the smoke.... is it have a blue hue like your burning oil or, is it have a whiteish hue like you are burning coolant... basically we need more info

cdowns · 10-15-2011, 11:13 AM

i'd look at the firewall and seal up open holes then the floorboards

50bomb · 10-15-2011, 11:16 AM

sometimes the intake manifold on corners leaks oil and mabye thats hitting the exhaust and making the smoke come in. I know I had that problem on one of my past trucks.

glljr · 10-15-2011, 11:42 AM

It's a blue smoke but the truck is never low on oil when i check it. It did start doing it after i swapped out my intake.

GASoline71 · 10-15-2011, 11:56 AM

Oil from somewhere is getting on the exhaust.

Usual suspects are the oil sending unit on the back of the block. The manifold valley seals, and valve cover seals.

Gary

glljr · 10-15-2011, 12:09 PM

The only thing that has me confused is it only does it at wot.

GASoline71 · 10-15-2011, 12:21 PM

More oil flow at WOT...

Gary

cdowns · 10-15-2011, 01:11 PM

do you have cheap valva covers without baffels under the PVC valve?? they cause oil to b sucked up and burned

turp mcspray · 10-15-2011, 01:47 PM

Quote:

Originally Posted by glljr

The only thing that has me confused is it only does it at wot.

I had a car years ago that had a valve cover leak. If I climbed a long hill, or ran for a good distance at wot, I could smell the oil burning off the exhaust. I always figured the extra load, increased the exhaust temp enough to burn what normally didn't burn off.

fastwillie 696969 · 10-15-2011, 04:22 PM

what weight oil are you using start there first ?

glljr · 10-15-2011, 04:42 PM

I am running 20 50 oil

hayhauler71 · 10-16-2011, 04:32 PM

engine blow by ?

Hubscrub · 10-16-2011, 05:16 PM

My buddy's nova had smoke coming in the interior and out rear when wide open (i was with him one day when he had to go to the potty) so we was on it! i checked it out when he was well..... turned out that the bolt on the front of the block was missing letting oil out and burning on the exhaust. If your block has the two threaded holes on the passenger side bottom front the top one should have a bolt in it. *just a thought*

glljr · 10-17-2011, 12:56 PM

Think I got it figured out. swapped out the fuel pump and no more leaking or smoke yet. The pump was leaking and between the gas and oil it was making a huge mess. So now another question is why does this motor feel like a dog. I have a performer plus rv cam with a performer intake and holley 600 carb. Just doesnt feel like it has any type of gettup and go but cruises nice on the highway. Also has a turbo 350 trans converted from a stick.

cdowns · 10-17-2011, 02:10 PM

rearend ratio and tire size affects acceleration with a heavy vehicle built like a barn

10-15-2011, 11:02 AM	#1
glljr Registered User Join Date: Jun 2011 Location: Douglassville PA Posts: 82	Smoking Have a 71 350 smoke comes in cab under hard acceleration, not sure where to start looking to fix problem?

10-15-2011, 11:06 AM	#2
longbed67 Registered User Join Date: Jun 2011 Location: Monroe, WI Posts: 1,415	Re: Smoking Open the hood, rev it up by hand and take a look to see where you have a leak...and what color is the smoke.... is it have a blue hue like your burning oil or, is it have a whiteish hue like you are burning coolant... basically we need more info __________________ *Adam* My 1967 C10 - Turbo 250 Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=485843 (608) 214-8706

10-15-2011, 11:13 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Smoking i'd look at the firewall and seal up open holes then the floorboards __________________ 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

10-15-2011, 11:16 AM	#4
50bomb Registered User Join Date: Jul 2010 Location: Hemet,Ca Posts: 1,502	Re: Smoking sometimes the intake manifold on corners leaks oil and mabye thats hitting the exhaust and making the smoke come in. I know I had that problem on one of my past trucks.

10-15-2011, 11:42 AM	#5
glljr Registered User Join Date: Jun 2011 Location: Douglassville PA Posts: 82	Re: Smoking It's a blue smoke but the truck is never low on oil when i check it. It did start doing it after i swapped out my intake.

10-15-2011, 12:09 PM	#7
glljr Registered User Join Date: Jun 2011 Location: Douglassville PA Posts: 82	Re: Smoking The only thing that has me confused is it only does it at wot.

10-15-2011, 01:11 PM	#9
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Smoking do you have cheap valva covers without baffels under the PVC valve?? they cause oil to b sucked up and burned __________________ 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

10-15-2011, 04:22 PM	#11
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: Smoking what weight oil are you using start there first ? __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

10-15-2011, 04:42 PM	#12
glljr Registered User Join Date: Jun 2011 Location: Douglassville PA Posts: 82	Re: Smoking I am running 20 50 oil

10-16-2011, 04:32 PM	#13
hayhauler71 Registered User Join Date: Aug 2009 Location: St. Paul MN. Posts: 1,996	Re: Smoking engine blow by ? __________________ Fuzzy

10-16-2011, 05:16 PM	#14
Hubscrub Cruzin Join Date: Dec 2009 Location: on the road Posts: 2,835	Re: Smoking My buddy's nova had smoke coming in the interior and out rear when wide open (i was with him one day when he had to go to the potty) so we was on it! i checked it out when he was well..... turned out that the bolt on the front of the block was missing letting oil out and burning on the exhaust. If your block has the two threaded holes on the passenger side bottom front the top one should have a bolt in it. just a thought __________________ Lime Wife's 67https://www.google.com/url?sa=t&rct=...wZEMODaS2d94u8 Back to the Fifties 59 https://www.google.com/url?sa=t&rct=...NAeStpydfrcj_U Proverbs 3:5,6 "Thanks to the Interstate Highway System, it is now possible to travel across the country from coast to coast without seeing anything."Charles Kuralt In memory of our first baby daughter, daddy and mommy love you. Danica Grace 6/26/14

10-17-2011, 12:56 PM	#15
glljr Registered User Join Date: Jun 2011 Location: Douglassville PA Posts: 82	Re: Smoking Think I got it figured out. swapped out the fuel pump and no more leaking or smoke yet. The pump was leaking and between the gas and oil it was making a huge mess. So now another question is why does this motor feel like a dog. I have a performer plus rv cam with a performer intake and holley 600 carb. Just doesnt feel like it has any type of gettup and go but cruises nice on the highway. Also has a turbo 350 trans converted from a stick.

10-17-2011, 02:10 PM	#16
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Smoking rearend ratio and tire size affects acceleration with a heavy vehicle built like a barn __________________ 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 Last edited by cdowns; 10-17-2011 at 02:17 PM.



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