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Jon H


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Exhaust analyzer
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The carb on my car has been running rich/lean?

Long story short, whenever I am out for a run, I come home and through my shirt in the laundry as it has a terrible exhaust smell. I know these cars don/t have catalytic converters and do smell some but this has been excessive. During the Cruise for the Troops run, John P. who was following me said his eyes were burning the whole way from my exhaust. I always thought it was rich but after talking to some people I trust on carbs they are telling me that smell/irritation is from a lean condition, not rich. I think my best option is to put this on an exhaust analyzer and see what it tells me. First, any other options I should explore first? Second, anyone know of the least expensive way to do the analyzer, preferably one that will test while driving?



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'69 Convertible,  Lemans Blue, 454, 200 4R, 12 Bolt. 

Jon H.  Lino Lakes
Lost in the 60s


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Do you have an o2 bung in the exhaust now ? That is the best way to tune the engine.



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Mitch D.   River Falls, WI

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1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS/RS 350 M20
Bobs_Place


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Lost in the 60s wrote:

Do you have an o2 bung in the exhaust now ? That is the best way to tune the engine.

 I agree, I have been using o2 sensor first on my boat and now on the Chevelle. I use the Innovate Motor Sports, they have a gauge kit for as low as $220.00 or so. You can also upgrade to a full data log system.  It works well.

The rich/Lean thing, a lean running engine is much more prone to misfires, stumbles and hesitation, a rice running engine will be sluggish and possible load up or foul plugs.
My guess it`s rich, a lean stumble is very aggravating to drive.

As for the exhaust smell, check for the plugs in the wells just behind the wheels,  the holes are on the inside of the panel below the trunk floor. Once exhaust is in the trunk, your going to smell it in the passenger compartment.

 



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Bob W.

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Jon H


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No bungs installed. The car runs great with no stumbles or hesitation. True numbers would be nice to know. Checked with on shop and they can do it through the full driving range and see how the secondaries kick in for $100.

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'69 Convertible,  Lemans Blue, 454, 200 4R, 12 Bolt. 

Jon H.  Lino Lakes
SteveS


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I have the Innovative kit we used on Kevin's Buick, it has a tailpipe clamp so you wouldn't need a bung, although a bung would be more accurate.  We could hook it up, but with the drive time if you've got a local shop that will do it for $100 that would be the way to go.



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Steve S. - Fountain, MN

 

1972 Chevelle - 383 stroked LS1/4L60E - SOLD!
Jon H


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SteveS wrote:

I have the Innovative kit we used on Kevin's Buick, it has a tailpipe clamp so you wouldn't need a bung, although a bung would be more accurate.  We could hook it up, but with the drive time if you've got a local shop that will do it for $100 that would be the way to go.

 Thanks Steve, let me think on that.



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'69 Convertible,  Lemans Blue, 454, 200 4R, 12 Bolt. 

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67ss


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I think that Saint paul automotive that the camaro club has there dyno deal at each year will do this. I think they load it on their dyno and will tune it. Might PM Mitch to be sure.



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
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67ss wrote:

I think that Saint Paul automotive that the Camaro club has there dyno deal at each year will do this. I think they load it on their dyno and will tune it. Might PM Mitch to be sure.

They will but Scott would prefer to install a bung and read from a sensor too, so the $100 is a deal.

If need be, I can install a bung at some time too...dunno



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Mitch D.   River Falls, WI

Lifetime member of the "Cars apart Club"

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS/RS 350 M20
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Jon, have you pulled a spark plug from each head to check them for being tan or black from being carboned up? That's probably the easiest first step.  If you find they are carboned up, maybe go down the AF ratio monitor path after having the carb checked?



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Stan S.-Twin Cities 'South Metro'

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