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Author
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Topic: car running too rich--it STINKS!!
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jay67fast
Gearhead Posts: 146
From: Boca Raton, Florida,U.S.A.
Registered: Nov 2004
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posted 03-03-2005 05:08 PM
 
Here's the car-- 1967, 289, 4barrel autolite 4100 carb,a/t, standard single point ignition.
Here's the problem-- The exhaust STINKS!!! It smells so bad that when I shut down the engine I have to keep the garage door open for a while or it stinks up the inside of the house!
It smells like a combination of burned and unburned gas and exhaust fumes. The tailpipes are sooty on the inside. Seems to point to the engine running too rich. Agreed?? O.K.,now how do I lean out the carb? Are there adjustments to do this on the carb? Do I have to rebuild the entire carb?(the carb has only a couple of thousand miles on it). Plugs(burning a nice tan color, set to .034)),points(set to .017), condenser, cap, rotor, wires, coil are all new. The only thing I can think of is that the carb is a C5ZF-D instead of a C6ZF-C. Could that be the problem? Maybe the wrong size jets for the engine? I'm lost---any help out there
Thanks,
Jay67fast
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 03-03-2005 05:16 PM
If your plugs are a nice tan color, the tune isn't all that far off, unfortunately. The older cars really did push out the hydrocarbons, and if you're used to the cleaner exhaust smell of a newer car, it can come as a unpleasant surprise.------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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66_stang
Gearhead Posts: 107
From: The woodlands Texas
Registered: Jul 2004
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posted 03-03-2005 05:17 PM
Im not seeing a problem here.. :grin i love the smell lol.
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 03-03-2005 05:29 PM
I can tell when the plugs are getting tired by the difference in smell, pretty cool.------------------
William
68 Coupe
"Project Under Construction" [This message has been edited by 68 Coop (edited 03-03-2005).]
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 03-03-2005 06:44 PM
quote:
Originally posted by SteveLaRiviere:
unfortunately. The older cars really did push out the hydrocarbons,
You have to love the smell of a real CAR. 
------------------
oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 03-03-2005 06:48 PM
It's been a while, but the 351C in my Sprint used to smell like gunpowder when it was running. I thought that was cool.  ------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 03-03-2005 06:54 PM
At cruise nights I'm the only one in my family. Who doesn't think that exhaust stinks. Even those eye watering super rich cars are cool.  Smoking Rubber doesn't cause cancer.  ------------------
oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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68mustang351w
Gearhead Posts: 558
From: San Jose, Ca
Registered: Sep 2004
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posted 03-03-2005 06:55 PM
I dont know if this will help you but i use to have a stong gasonline smell too, it ended up being that i had tiny (pin sized) holes in the gas tank. Not big enough to actually leak but still there, obviously i replaced the tank... David F.
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majik455
Gearhead Posts: 215
From: duluth ga usa
Registered: Jan 2005
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posted 03-03-2005 06:57 PM
I have found that diff brand names of gasoline and ratings affect the "smells" . You can try that :0 not that I go sniffing my exhaust . I have the same issue with my car and garage.
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 03-03-2005 07:02 PM
Did you ever seen the fluid Summit sells to scent your exhaust? Everything from peppermint to raspberry.  ------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 03-03-2005 07:04 PM
quote:
Originally posted by SteveLaRiviere:
Did you ever seen the fluid Summit sells to scent your exhaust? Everything from peppermint to raspberry.
I did I've been trying to get my dad to use it in his 88GT.
Maybe once we get the T-bucket done. I put some in the tank without him knowing it. ------------------
oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 03-03-2005 07:05 PM
It they made it fart smell it would be a perfect Christmas gift for Alex.  ------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 03-03-2005 07:06 PM
LOL ------------------
oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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jay67fast
Gearhead Posts: 146
From: Boca Raton, Florida,U.S.A.
Registered: Nov 2004
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posted 03-03-2005 09:47 PM
Boy, the answers I got sure weren't what I expected (or wanted to hear)!!! This is my fourth 67 or 68 mustang, 2 inline sixes (both daily drivers, one driven for 6 years and the other driven for over 2 years) and two 289s (1 a 2 barrel,which I owned and drove daily for over 9 years and this one, a 4 barrel which I've owned for about 9 months), and this is the first time I have encountered an issue with exhaust odor. I can't believe this is normal. All the other Mustangs never smelled at all. As a matter of fact, the 289,2 barrel consistantly gave me near 20 MPG (highway)for all the years I owned it. This 4 barrel only gives me 10 MPG, whether around town or on the highway. I think something is wrong. Could the 4 barrel make that much difference in the efficiency of the engine? I can live with 10 MPG but even that doesn't seem right; It just seems to me that something is wrong someplace. Any other ideas?
Thanks------------------
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 03-03-2005 09:55 PM
If it has A/F adjustment screws on the front, you can start with 1 1/2 turns OUT, and take it from there.------------------
William
68 Coupe
"Project Under Construction" [This message has been edited by 68 Coop (edited 03-04-2005).]
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 03-04-2005 02:08 AM
Sorry for messing up your question. Start with ajusting your A/F mixture. A tuned motor should give you more then 10mpg. With or without a 4 barrel.------------------
oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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exlocal
Gearhead Posts: 1552
From: hacienda hts., CA, USA
Registered: Dec 2004
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posted 03-04-2005 11:16 AM
Does the engine "diesel" when you turn it off? I had a car that wouldn't quit running after turning off the ignition and it had a really bad smell, like unburnt gas, even when running. It turned out to be a big vacuum leak on the intake manifold. Something else to think of.------------------
reliving youth
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beachbum
Gearhead Posts: 307
From: Florida
Registered: Oct 2001
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posted 03-04-2005 11:18 AM
My 1968, 289 smells just like you describe and always has. I really don't notice it until I pull it in the garage, shut the engine down and close the door. I usually leave the garage open a short time and the smell goes away.
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jay67fast
Gearhead Posts: 146
From: Boca Raton, Florida,U.S.A.
Registered: Nov 2004
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posted 03-04-2005 01:22 PM
Exlocal,
You may have hit the nail on the head!!!YES, the engine does diesel, especially when fully warmed up. I just never equated that with the exhaust stink. I'll check for a vacuum leak later today and keep you posted.
Sure would be nice if it were something simple, for a change!!!
Thanks,
------------------
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 03-04-2005 09:50 PM
I had raw gas leaking from my distributer.lol the vacuum diaphram was trashed in my dizzy and some how after the car shut down fue l would leak down the vacuum line. i jsut took the hose off and plugged it up.------------------
88 thunderbird TC 2.3L
66 mustang 200ci 3 speed
68 Fairlane 289 w/ auto
79 f150 300 3 onda tree
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jay67fast
Gearhead Posts: 146
From: Boca Raton, Florida,U.S.A.
Registered: Nov 2004
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posted 03-05-2005 01:21 PM
exlocal,
Thanks for the suggestion, but no joy. I can't find any sign of a vacuum leak. So, no simple solution for me. I'll just have to keep on trying.
Thanks again
jay67fast
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exlocal
Gearhead Posts: 1552
From: hacienda hts., CA, USA
Registered: Dec 2004
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posted 03-06-2005 12:37 AM
quote:
Originally posted by jay67fast:
exlocal,
Thanks for the suggestion, but no joy. I can't find any sign of a vacuum leak. So, no simple solution for me. I'll just have to keep on trying.
Thanks again
jay67fast
I thought I had an actual fuel leak somewhere, so was spraying carb cleaner around the intake manifold to clean stuff up and noticed that the engine would start stumbling. All the intake bolts were tight, but turned out to be the intake manifold gasket on this particular chebbie. Good luck. ------------------
reliving youth
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