Re: IML: Lean burn and exhaust help...

["Stevan Miner" <miner@xxxxxxxxxxx>]

Hi Tom,
The Lean Burn system is one of the most misunderstood systems that Chrysler 
ever made. It really doesn't have any thing to do with the fuel system so 
chance of it causing any idle roughness or stumble is remote. It is used to 
electronically control the timing which allows a leaner fuel mixture thus 
better mileage. The number of control boxes I've replaced I can count on one 
finger as they don't go bad all that often. I've had pretty good results by 
running the carb a little richer to eliminate stumble and rough running. The 
fuel available today isn't any where close to what was back in the 70's. In 
the center of the metering rod hanger is a set screw which if you turn 
clockwise will raise the rods out of the jets giving a richer mixture. Don't 
get carried away, usually 1 to 2 turns is plenty. Also make sure when you're 
setting the base timing, make sure to ground the stop on the carb 
transducer.
Stevan Miner
Miner Auto Service
Winnebago, MN
----- Original Message ----- 
From: "Thomas A.Nedelka" <eesigns@xxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Friday, August 24, 2007 3:50 PM
Subject: IML: Lean burn and exhaust help...


> If anyone can help..I have a 78 NYB with 400/4bbl and lean burn.  The car 
> cameout of Calgary two summers ago with only 10,500 original miles/1 
> owner. I am trying to keep it as original as possible.  I had the carb 
> rebuilt by a top Chrysler mechanic, and it has helped the roughness off 
> idle, but not solved it.  He replaced the Throttle Positioning Sensor as 
> it was not sending any signal, and reports that the other sensors that 
> feed the Lean Burn are working, so the rule is then to go to the Lean Burn 
> box.  IT is part # 4111278, both from the book and from the existing box. 
> I do have the Lean Burn replacement kit, but prefer not to use it.  Any 
> idea where I can get this, or get it repaired?
>
> Also, the tail pipe separated at the muffler, and I want to replace it all 
> from the Y pipe back(extension, muffler, resonator, etc) to get it right 
> and keep as original as possible. The car was build for Canada, and does 
> not seem to have had a Cat Converter.
>
> The car now has about 20,000 miles, with almost all original parts, and 
> paint.  It is stunning, including the factory sunroof.
>
> Thanks for any and all help.
> Tom
>
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