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Technical Smelly Exhaust. The car

Discussion in 'Traditional Hot Rods' started by modagger, May 8, 2021.

  1. F-ONE
    Joined: Mar 27, 2008
    Posts: 2,670

    F-ONE
    Member
    from Alabama

    Acrid?? Burns the eyes??

    My first thought is bad gasoline.

    These days you can get rotten gas right from the pump depending on how "kept up" the gas station tanks are.

    Since it's Springtime you may be burning gas from last year. The gas may be starting to turn. I would run her dry, completely empty and see how she does with fresh gasoline.
    If the tank has age on it ; it does have to be that old, you may have a blob of rotten gas in there. That stuff looks like tar and it will contaminate any new gas.
    I would run it empty and see how it does with fresh gas. If it still does it, I would try to check the tank to see you you have any tar/varnish/rotten gas in there.
     
  2. Bbdakota
    Joined: Oct 23, 2019
    Posts: 56

    Bbdakota

    Funny this topic came up when it did. I'm having the same problem just last night. I'm hoping it is bad gas like f-one stated....I filled up at a new gas station just before our trip and had never noticed that smell, irritated eyes and throat before but I had a extra 600 lbs with a car full and trunk full so the engine was laboring more then usual. I pulled a plug this morning just to check, looks great like ir always has, no different. I'll also take f-one's advice and suspect it's the fuel now that I know the plugs look good
     
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  3. modagger
    Joined: Jul 2, 2013
    Posts: 268

    modagger
    ALLIANCE MEMBER

    My initial thoughts exactly F-ONE.

    After the first acrid whiff last year, I ran one more full tank from a different gas station dry, checked the tank, looks as good inside as outside. Replaced the fuel filter. New gas, same stank.

    I’m going to get a read on the plugs today and tweak the screws on the carb to see if as a few have suggested, it might be on the lean side.

    Thanks for the thoughts
    Jeff
     
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  4. F-ONE
    Joined: Mar 27, 2008
    Posts: 2,670

    F-ONE
    Member
    from Alabama

    I replaced the heads on a Y block some years ago that had 6 burned valves. Four of the six looked like 4 leaf clovers and were sunk into the head.

    That joker was running!, Not good but it was running.

    I believe a big issue on a Y is valve adjustment. It's been a long time since I had a Y, but I have read it's best to adjust the valves with round or needle type feeler gauges rather than the common flat type. It seems the flat type may not be as accurate.

    Anyway, if the valves are out of adjustment, they start to burn.
    I would do a compression check first and then adjust the valves.
     
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  5. lippy
    Joined: Sep 27, 2006
    Posts: 5,483

    lippy
    Member
    from Ks

    Maybe your catalytic convertor is plugged.:D
     
  6. Just a thought, charging system?
     
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  7. low down A
    Joined: Feb 6, 2009
    Posts: 333

    low down A
    Member

    i too have noticed a different smell coming out the exhaust, and running a little sluggish. i buy premium no alcohol from the last local owned station in this small town. last november i was winterizing the cars and bikes full tank with marvel and the owner and i got in a conversation about slow gas sales due to covid he stated he hadn't had to fill his premium underground tank in almost a year. i had my answer
     
  8. Around my area we have 2 Gas station's that sell High Test gas
    no additive you pay more for it But it's well worth it
    I always top off my Tank in the Winter with Stabilt & I am good
    till Spring or when the Weather starts to be Nice.!
    1 station is a Steward's gas station & the other is a CEO gas station
    which is local.

    Just my 3.5 cents

    Live Learn & Die a Fool
     
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  9. low down A
    Joined: Feb 6, 2009
    Posts: 333

    low down A
    Member

    on a positive note speaking of smell's, went out to the closed up shop this morning were a car that i had primed in urethane primer yesterday was curing overnite. that smell in the air is one of my favorite
     
  10. jimmy six
    Joined: Mar 21, 2006
    Posts: 8,792

    jimmy six
    Member

    Message sent
     
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  11. modagger
    Joined: Jul 2, 2013
    Posts: 268

    modagger
    ALLIANCE MEMBER

    How did I not think to look there!?:D
     
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  12. modagger
    Joined: Jul 2, 2013
    Posts: 268

    modagger
    ALLIANCE MEMBER

    Pulled all of the plugs today. Approximately 200 miles on them. Autolite 46’s. They all look like this. Any thoughts? 31DA1C6C-2AC8-426A-A950-8923D9FB288C.jpeg
     
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  13. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,924

    seb fontana
    Member
    from ct

    Or a zipper on the album cover.
     
  14. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,924

    seb fontana
    Member
    from ct

    A little on the lean side and plugs should be a colder one, maybe a #35 but I don't know how the numbers run anymore.
     
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  15. Those plugs look super lean to me. I always look for a light tan color. Maybe this new dishwater they call gasoline doesn’t color plugs the way they used to?


    Sent from my iPhone using H.A.M.B.
     
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  16. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,924

    seb fontana
    Member
    from ct

    ^^^X2^^^
     
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  17. 19Eddy30
    Joined: Mar 27, 2011
    Posts: 1,152

    19Eddy30
    Member
    from VA

    ^^^XXX3
    A Good Quality wideband O2 gauge is your friend it will tell you exactly where you are at on your fuel mixture , Looking at plugs WITH gasoline off the pump, your eyes will lie to you
     
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  18. Truck64
    Joined: Oct 18, 2015
    Posts: 4,519

    Truck64
    Member
    from Ioway

    Maybe look for a vacuum leak, if the problem is new. It usually takes some dedication to make the carburetor itself run lean. I agree varnished old stale fuel will smell really gnarly. He mentions trying different octanes &c in the first post.
     
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  19. Harv
    Joined: Jan 16, 2008
    Posts: 162

    Harv
    Member
    from Sydney

    Looks more like lean WOT and rich idle to me. Similar to example 2 here:

    http://www.4secondsflat.com/Spark_plug_reading.html

    From what I understand, the OP's stank problem is at idle - a rich idle will smell fuelly rather than rank. Easy to check though by fattening the idle screw. If it doesn't work, turn it back the same number of turns.

    Cheers,
    Harv
     
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  20. jimmy six
    Joined: Mar 21, 2006
    Posts: 8,792

    jimmy six
    Member

    Are you getting 60-70 mpg? I’ve never seen the porcelain on a plug that white after it has run 200 miles before..especially with wet ends and dark threads.
     
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  21. modagger
    Joined: Jul 2, 2013
    Posts: 268

    modagger
    ALLIANCE MEMBER

    Truck, I have looked for a vacuum leak with a handheld bomb, propane torch. No idle increase at all.
     
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  22. modagger
    Joined: Jul 2, 2013
    Posts: 268

    modagger
    ALLIANCE MEMBER

    What I don’t understand is that this engine is very responsive through all gears. Doesn’t hesitate, lag or bog down at all. It’s just that nasty stank that baffles me.

    I agree that except for the dark treads, the plugs look unused. I’m going to try fattening up the mixture a bit to see how that works. Stay tuned.
     
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  23. Deuces
    Joined: Nov 3, 2009
    Posts: 19,953

    Deuces
    Member
    from Michigan

    I'd use a vacuum gauge.... ;)
     
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  24. modagger
    Joined: Jul 2, 2013
    Posts: 268

    modagger
    ALLIANCE MEMBER

    Deuces

    I did. :cool:
     
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  25. Deuces
    Joined: Nov 3, 2009
    Posts: 19,953

    Deuces
    Member
    from Michigan

    My bad... Guess I didn't catch that...:rolleyes::oops:
     
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  26. Greg Rogers
    Joined: Oct 11, 2016
    Posts: 397

    Greg Rogers
    Member

    Don't know about the smell, but that plug is too hot for sure, and too lean. See how the electrode is discolored? I'll bet it is red hot when car is running down road.
     
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  27. SS327
    Joined: Sep 11, 2017
    Posts: 226

    SS327

    For sure too lean. Listen to the advise given.
     
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  28. modagger
    Joined: Jul 2, 2013
    Posts: 268

    modagger
    ALLIANCE MEMBER

    For sure! Next step is to fatten it up a bit and see where that gets me.
     
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  29. modagger
    Joined: Jul 2, 2013
    Posts: 268

    modagger
    ALLIANCE MEMBER

    As far as I’m concerned, there are no “bads” here. Thanks for the advice.
     
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  30. jnaki
    Joined: Jan 1, 2015
    Posts: 5,647

    jnaki





    Hello,

    The swallows do not always return to Capistrano Mission on time every year. There are now and have always been plenty of places (including our So Cal homes) where they have gathered to make their crazy nests and cubby holes long before the March due date.

    The resulting patio, floors, brick work and other places underneath those crappy birds take the brunt of the "Swallows Returning to Capistrano." The slogan should be amended to say all of Capistrano Valley area, including personal homes and weather protected garden structures.

    Jnaki

    The nests are "protected" while occupied, but the people underneath the bombardment are not. Save the people... HA!

    If the nests and resulting "stuff" are still standing when they leave, it does get a little rank.

    There is a great old song called "Can't Find My Way Home..." (BLIND FAITH) that applies to this scenario. Birds without GPS... what a concept.


    Sometimes, a small, miniscule leak from those "upgraded" mufflers with the legal construction inside do give off a bad smell. Even if your upgraded exhaust system is functioning as it should, small leaks do arise from road usage and could be a problem with the smell. Hopefully you do not have the so called lakes pipes or collectors ending near the doors or windows. YRMV
     
    Last edited: May 10, 2021

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