Exhaust Smell In Cab - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bandit130 · 06-24-2019, 10:13 AM

Bought my truck in 2015. Had original exhaust manifolds and single exhaust. I could smell exhaust in cab when stopped at stop sign and red lights. Driving I do not smell it. Since then, both manifolds have been replaced. Most recent, Friday, had complete new dual exhaust from manifold to rear bumper and still have exhaust smell. I am at a loss as to where smell is coming from. Using AC or not, still have it. Any suggestions?

cadillac_al · 06-24-2019, 10:59 AM

Are you sure it's exhaust or is it oil burning on the manifolds?

Dead Parrot · 06-24-2019, 11:49 AM

Check for small fuel leaks, especially the fuel pump. Fuel vapor can smell very close to exhaust by the time it gets into the cab.

sweetk30 · 06-24-2019, 01:00 PM

were do they exit ? side or out the back ?

i know on blazers and suburbans with the rear window down if you have out the back the smell will come swirling right back in at you bad .

i prefer side for this reason and less prone to smashing it up if you back up or drop in to far with a ditch ( 4x4 trucks for me )

Bandit130 · 06-24-2019, 02:33 PM

Quote:

Originally Posted by sweetk30

were do they exit ? side or out the back ?

i know on blazers and suburbans with the rear window down if you have out the back the smell will come swirling right back in at you bad .

i prefer side for this reason and less prone to smashing it up if you back up or drop in to far with a ditch ( 4x4 trucks for me )

Now exit out back. Previously with single exhaust exited behind rear wheel on drivers side. Now, with dual, is the same as before.

geezer#99 · 06-24-2019, 03:10 PM

Maybe it’s not exhaust.
Could be crankcase fumes.
Do You have a working pcv system?

Bandit130 · 06-24-2019, 07:24 PM

Quote:

Originally Posted by geezer#99

Maybe it’s not exhaust.
Could be crankcase fumes.
Do You have a working pcv system?

Yes, I have pcv connected to carb on left side. Breather on right side. Cleaned pcv valve and getting new one in a couple of days. Had to order.

Ol' Drippy · 06-27-2019, 02:31 PM

You can check for exhaust leaks with the engine off pretty easily with a shop vacuum. Tape it to your exhaust tip (and plug up the other one if you have dual exhausts with a cross-over) and set the vacuum to blow. This will pressurize your exhaust and then you can go around with soapy water spray looking for leaks.

truckin 79 · 06-27-2019, 05:47 PM

I would check your carb and see if it is running to rich. If carb is running rich it will have that nasty thick exhaust smell. If you can smell it just by standing next to truck, then it might be the carb and it needs adjustment.Heat riser is gone on passenger side correct?

06-24-2019, 10:13 AM	#1
Bandit130 Registered User Join Date: Dec 2014 Location: Euless, Texas Posts: 510	Exhaust Smell In Cab Bought my truck in 2015. Had original exhaust manifolds and single exhaust. I could smell exhaust in cab when stopped at stop sign and red lights. Driving I do not smell it. Since then, both manifolds have been replaced. Most recent, Friday, had complete new dual exhaust from manifold to rear bumper and still have exhaust smell. I am at a loss as to where smell is coming from. Using AC or not, still have it. Any suggestions? __________________ 1974 Cheyenne 10 LWB Stock 350 W/HEI /TH350/AC/4 BBL Quadrajet Mopar by Birth Chevy by Choice

06-24-2019, 10:59 AM	#2
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,340	Re: Exhaust Smell In Cab Are you sure it's exhaust or is it oil burning on the manifolds? __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

06-24-2019, 11:49 AM	#3
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,487	Re: Exhaust Smell In Cab Check for small fuel leaks, especially the fuel pump. Fuel vapor can smell very close to exhaust by the time it gets into the cab.

06-24-2019, 01:00 PM	#4
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Exhaust Smell In Cab were do they exit ? side or out the back ? i know on blazers and suburbans with the rear window down if you have out the back the smell will come swirling right back in at you bad . i prefer side for this reason and less prone to smashing it up if you back up or drop in to far with a ditch ( 4x4 trucks for me ) __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

06-24-2019, 03:10 PM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,517	Re: Exhaust Smell In Cab Maybe it’s not exhaust. Could be crankcase fumes. Do You have a working pcv system?

06-27-2019, 02:31 PM	#8
Ol' Drippy Registered User Join Date: Apr 2012 Location: Falls Church Va Posts: 77	Re: Exhaust Smell In Cab You can check for exhaust leaks with the engine off pretty easily with a shop vacuum. Tape it to your exhaust tip (and plug up the other one if you have dual exhausts with a cross-over) and set the vacuum to blow. This will pressurize your exhaust and then you can go around with soapy water spray looking for leaks.

06-27-2019, 05:47 PM	#9
truckin 79 Registered User Join Date: Jun 2014 Location: CO Posts: 731	Re: Exhaust Smell In Cab I would check your carb and see if it is running to rich. If carb is running rich it will have that nasty thick exhaust smell. If you can smell it just by standing next to truck, then it might be the carb and it needs adjustment.Heat riser is gone on passenger side correct? __________________ 79 Chevy 2wd BIG10 350 TH400



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