Exhaust Soot ??

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Mar 5, 2012 | 10:26 AM

jlhtec

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Joined: Sep 2011

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From: Midlothian Texas

Exhaust Soot ??

Everytime I start the car, I get two nice black sooty stains on the concrete right below the exhaust. I did alot of upgrades to the car at once.

Didn't notice the soot until the upgrades. BTW... It is worse than the picture shows!!

Headers
Dual exhaust no cats
Vortec Heads
Performer RPM Intake
Carb

Any ideas??

Mar 5, 2012 | 11:01 AM

Mike Ward

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Joined: Jul 2001

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Mixture is too rich, choke is stuck on.

Mar 5, 2012 | 11:31 AM

Mark Riles

Pro

Joined: Feb 2012

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Quote:

Originally Posted by Mike Ward

Mixture is too rich, choke is stuck on.

Pull, mark, and read the color of your plugs. Brown / Tan is perfect. Black is rich and white is lean. I'm with Mike in suspecting your mixture.

Mar 5, 2012 | 11:37 AM

Jims66

Drifting

Joined: Apr 2008

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From: Lexington Park Maryland

Yup, agree w/Mike. Too rich............

Mar 5, 2012 | 11:37 AM

7T1vette

Team Owner

Joined: Jan 2006

Posts: 37,637

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From: Crossville TN

Need to adjust choke plate at start-up. Probably closed too far (not enough airflow...too rich).

Mar 5, 2012 | 03:22 PM

jlhtec

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From: Midlothian Texas

Thanks!! I'll try adjusting the choke tonight and see what happens

Thanks,
Jeff

Mar 5, 2012 | 07:18 PM

Paul L

Team Owner

Joined: Aug 1999

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From: Ontario

When you set the choke by putting the pedal to the floor you introduce a squirt of fuel into the engine. Of course it will be rich at start-up. Seems normal to me unless the black persists for some time.

Mar 7, 2012 | 10:31 AM

jlhtec

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From: Midlothian Texas

Thanks All !

I adjusted the choke to be partially open cold, and NO Black Soot!

Now I just have to lower my high idle, which is kinda painful on the 3310.

Thanks !!
Jeff

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Mar 7, 2012 | 12:38 PM

MelWff

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what is difficult about lowering the idle on a Holley 3310?

Mar 7, 2012 | 12:49 PM

#10

ramair_bryan

Safety Car

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H20

The by product of combustion is........

Mar 7, 2012 | 12:49 PM

#11

scottyp99

Le Mans Master

Joined: Mar 2008

Posts: 5,948

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From: Oxford MA-----You just lost the game!!!!

Quote:

Originally Posted by MelWff

what is difficult about lowering the idle on a Holley 3310?

Yeah, man, all ya have to do is turn one screw, it's easier than falling in love!

Do you have an electric choke on the 3310? They are pretty nice, set it and forget it.

Keep the shiny side up!