Exhaust Smell From Only One Exhaust Pipe - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ol'blu72 · 05-30-2015, 10:01 PM

So I have been doing some tuning and leaned the carb out a bit. It is running good but I am getting fuel smell from the right exhaust pipe. The left one does not have this smell. What could be going on??

**Grumpy old man** · 05-30-2015, 10:11 PM

Well... You can't lean out your carb by smell . It's done by rpm and vacuum lean to far and you start burning valves . your better to run rich and save your engine .Stop smelling your exhaust it's really not good for you and definetly kills brain cells .

ol'blu72 · 05-30-2015, 10:28 PM

Quote:

Originally Posted by Grumpy old man

Well... You can't lean out your carb by smell . It's done by rpm and vacuum lean to far and you start burning valves . your better to run rich and save your engine .Stop smelling your exhaust it's really not good for you and definetly kills brain cells .

Thank you for your input, but I am not asking how to tune, I am asking what could be causing a fuel smell from only one bank.

hugger6933 · 05-30-2015, 10:35 PM

Check your plugs, if you have headers and a thermo gun shoot each tube to find the coldest one then pull that plug or check the wire to the hole. If you don't have a thermo gun [most don't, I use them to check the metal temp to know when I can paint among other things]drip a little water on each tube to see if it bubbles and burns off or not that one is hot is probably ok. The one that doesn't "fry" is where a good place to start looking. To smell as you say probably means as you know it is way fat. I don't mean Phat in the way the kids would say meaning cool either

. Jim

**Grumpy old man** · 05-30-2015, 10:38 PM

Fouled plug ? burnt wire ? lazy lifter ? worn cam lobe ? improper carb adjustment ? the variables are untold .

ol'blu72 · 05-30-2015, 10:45 PM

I do have a temp gun, I have ram horns and shot all the putputs and they were all around 220 except #6 which was about 320. Pulled the plugs one at a time and engine stumbled with each. Made sure the carb was even lt to rt (same jets, rods and idle screws).

**Grumpy old man** · 05-30-2015, 10:56 PM

There are still a lot of old style SUN gas engine analysers out there for sale cheap ,easier yet drop an x pipe into your exhaust and everything balances out fast .

**Stocker** · 05-31-2015, 12:12 AM

Sticking heat riser valve, forcing most of the exhaust through one pipe?

Sklptrljay · 05-31-2015, 07:27 AM

Could it be a burnt oil smell? Could be getting past a bad ring or valve stem.

geezer#99 · 05-31-2015, 08:33 AM

Look in the carb while it's running. Could be fuel dripping from the booster on only that side.

hugger6933 · 05-31-2015, 09:48 AM

The temp gun method I mentioned will not be as effective on a manifold equipped engines because of the construction of the manifold. Hope you get it lined out. Jim

05-30-2015, 10:01 PM	#1
ol'blu72 Registered User Join Date: Jun 2009 Location: Hampton Roads VA Posts: 333	Exhaust Smell From Only One Exhaust Pipe So I have been doing some tuning and leaned the carb out a bit. It is running good but I am getting fuel smell from the right exhaust pipe. The left one does not have this smell. What could be going on?? __________________ Brad 72 Blazer CST 350/350/205

05-30-2015, 10:11 PM	#2
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Exhaust Smell From Only One Exhaust Pipe Well... You can't lean out your carb by smell . It's done by rpm and vacuum lean to far and you start burning valves . your better to run rich and save your engine .Stop smelling your exhaust it's really not good for you and definetly kills brain cells .

05-30-2015, 10:35 PM	#4
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,280	Re: Exhaust Smell From Only One Exhaust Pipe Check your plugs, if you have headers and a thermo gun shoot each tube to find the coldest one then pull that plug or check the wire to the hole. If you don't have a thermo gun [most don't, I use them to check the metal temp to know when I can paint among other things]drip a little water on each tube to see if it bubbles and burns off or not that one is hot is probably ok. The one that doesn't "fry" is where a good place to start looking. To smell as you say probably means as you know it is way fat. I don't mean Phat in the way the kids would say meaning cool either. Jim

05-30-2015, 10:38 PM	#5
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Exhaust Smell From Only One Exhaust Pipe Fouled plug ? burnt wire ? lazy lifter ? worn cam lobe ? improper carb adjustment ? the variables are untold .

05-30-2015, 10:56 PM	#7
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Exhaust Smell From Only One Exhaust Pipe There are still a lot of old style SUN gas engine analysers out there for sale cheap ,easier yet drop an x pipe into your exhaust and everything balances out fast .

05-30-2015, 10:45 PM	#6
ol'blu72 Registered User Join Date: Jun 2009 Location: Hampton Roads VA Posts: 333	Re: Exhaust Smell From Only One Exhaust Pipe I do have a temp gun, I have ram horns and shot all the putputs and they were all around 220 except #6 which was about 320. Pulled the plugs one at a time and engine stumbled with each. Made sure the carb was even lt to rt (same jets, rods and idle screws). __________________ Brad 72 Blazer CST 350/350/205

05-31-2015, 12:12 AM	#8
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,722	Re: Exhaust Smell From Only One Exhaust Pipe Sticking heat riser valve, forcing most of the exhaust through one pipe? __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

05-31-2015, 07:27 AM	#9
Sklptrljay Registered User Join Date: Apr 2012 Location: Stillwater, Oklahoma Posts: 874	Re: Exhaust Smell From Only One Exhaust Pipe Could it be a burnt oil smell? Could be getting past a bad ring or valve stem. __________________ 1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy

05-31-2015, 08:33 AM	#10
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,731	Re: Exhaust Smell From Only One Exhaust Pipe Look in the carb while it's running. Could be fuel dripping from the booster on only that side.

05-31-2015, 09:48 AM	#11
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,280	Re: Exhaust Smell From Only One Exhaust Pipe The temp gun method I mentioned will not be as effective on a manifold equipped engines because of the construction of the manifold. Hope you get it lined out. Jim

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