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Spitting Black Liquid
#1
Nuclear Ned Ned S
Crossville, USA   USA
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1957 MG MGA 1500
1958 Chevrolet Impala
I probably already know the answer to this, but I'll pose the question nonetheless. When I start my '57 MGA it blows out spots of black liquid. I'm guessing my fuel mixture is too rich and its building up carbon which soon comes to rest in the exhaust pipe un til the next time I start the car and it blows it out like snot from your nose.

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Re: Spitting Black Liquid
#2
oleanderjoe Avatar
oleanderjoe Platinum AdvertiserAdvertiser Joseph Baba
Fresno, CA, USA   USA
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1962 Triumph Spitfire 4 (MkI) "SPITTY"
thumbs up SORRY started laughing, and had to stop typing. YES> PROBE your tailpipe, and if your PROBE device comes out SOOTY, the carbs are running rich.

In reply to # 4784968 by Nuclear Ned I probably already know the answer to this, but I'll pose the question nonetheless. When I start my '57 MGA it blows out spots of black liquid. I'm guessing my fuel mixture is too rich and its building up carbon which soon comes to rest in the exhaust pipe un til the next time I start the car and it blows it out like snot from your nose.


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Edited 1 time(s). Last edit at 2024-04-14 11:04 AM by oleanderjoe.


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Re: Spitting Black Liquid
#3
szpcn0 Avatar
szpcn0 Gold Member Bob Shafto
New Hudson, MI, USA   USA
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1957 MG MGA 1500
1960 MG MGA 1600
Yes, spitting soot (carbon) and water. Mixture is too rich.

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  oleanderjoe thanked szpcn0 for this post
Re: Spitting Black Liquid
#4
MGA56Joe Avatar
MGA56Joe Joe Walsh
CHESHAM, Buckinghamshire, UK   GBR
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1956 MG MGA 1500
Fit clean air filters, tune the carbs and give it a dam good thrashing thumbs up



Edited 1 time(s). Last edit at 2024-04-14 04:57 PM by MGA56Joe.

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Re: Spitting Black Liquid
#5
RJBrown Avatar
RJBrown Randy Brown
Queen Creek, AZ, USA   USA
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1957 MG MGA 1500
1958 MG MGA 1500 Coupe
1960 MG MGA 1600 "Later"
1962 MG MGA MkII
The largest component of exhaust is water.
Cold start includes use of choke.
Over rich mixture from choke makes black soot.
May be normal.
Don’t change mixture until checked warm and running.
Choke operation pulls jet tubes down.
Sometime jet tubes stick down, check them first.
Old cars spit black gunk on startup.
Live with it.

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Re: Spitting Black Liquid
#6
Grubeguy Avatar
Grubeguy Gold Member Grube Guy
Washington, DC, USA   USA
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1957 MG MGA 1500 Coupe "JP"
1958 MG MGA 1500
1968 Saab 96 3cyl 2stroke
1972 Fiat 850 Spider    & more
Also known as an Italian tuneup

In reply to # 4785112 by MGA56Joe give it a dam good thrashing thumbs up

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Re: Spitting Black Liquid
#7
SteveT3000 Avatar
SteveT3000 Steve Townsend
Forest of Dean, Gloucestershire, UK   GBR
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1948 MG TC
1957 MG MGA "Mavis"
1967 Austin-Healey 3000 BJ8
2019 Morgan Plus 4 (+4)
I wouldn’t change anything until youve checked a few things as it may be quite normal, especially if the car doesn’t get long enough runs to heat up properly.

It’s bound to be rich on choke start ups but check that the jet tubes fully return when the choke is in, they can stick.

Took me quite a lot of fiddling to get mine set up right but I had the opposite problem, wasn’t getting rich enough with the choke fully out.


1957 ‘Oselli’ MGA in Iris Blue
1950cc Stage 2

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Re: Spitting Black Liquid
#8
Blueosprey90 Avatar
Blueosprey90 Silver Member Jeff Sienkiewicz
New Milford, CT, USA   USA
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1957 Volvo PV444
1959 MG MGA
2004 Honda S2000
I have the problem with my ‘57 Volvo, but I thought it was more of an oil/water mix. The car is pretty decrepit though, and one can see a pound - er, … maybe two pounds - of carbon built up on the pistons if one pulls the spark plugs.

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Re: Spitting Black Liquid
#9
szpcn0 Avatar
szpcn0 Gold Member Bob Shafto
New Hudson, MI, USA   USA
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1957 MG MGA 1500
1960 MG MGA 1600
In reply to # 4785182 by RJBrown The largest component of exhaust is water.
Cold start includes use of choke.
Over rich mixture from choke makes black soot.
May be normal.
Don’t change mixture until checked warm and running.
Choke operation pulls jet tubes down.
Sometime jet tubes stick down, check them first.
Old cars spit black gunk on startup.
Live with it.

The largest component of exhaust is Nitrogen 71 %. Water (water vapor) is around 10%


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Typical-exhaust-gas-composition-of-a-gasoline-powered-spark-ignition-internal.jpg

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Re: Spitting Black Liquid
#10
SilasW Avatar
SilasW Gold Member Silas Kinsey
Canterbury, CT, USA   USA
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1966 MG MGB GT
In reply to # 4785261 by SteveT3000 I wouldn’t change anything until youve checked a few things as it may be quite normal, especially if the car doesn’t get long enough runs to heat up properly.

It’s bound to be rich on choke start ups but check that the jet tubes fully return when the choke is in, they can stick.

Took me quite a lot of fiddling to get mine set up right but I had the opposite problem, wasn’t getting rich enough with the choke fully out.

And final mixture adjustment must be done with the car stinking hot after a good hours hard run at midday.

Silas

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