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

["Stevan Miner" <miner@xxxxxxxxxxx>]

Hi Tom,
You can verify if the timing is working or not if you have a timing light 
with an advance setting. I disconnect the small wire that comes out of the 
front of the transducer on the right side of the carburetor. With the engine 
running you can change the timing by pulling the wire out of the transducer 
towards the rear of the car. The timing change should happen pretty quickly 
and is quite sensitive. Another thing to check is that there is a single 
wire lead coming from the harness on the Lean Burn computer that sometimes 
doesn't get reconnected after the air cleaner has been off. This will 
prevent proper operation also. I've had the most trouble with these at the 
grounding switch where the stop screw contacts the grounded terminal. I've 
had good results on the stubborn ones grinding the set screw to a sharper 
point on the end.
Stevan Miner
Miner Auto Service
Winnebago, MN
----- Original Message ----- 
From: "Thomas A.Nedelka" <eesigns@xxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Saturday, August 25, 2007 9:33 PM
Subject: Re: Re: IML: Lean burn and exhaust help...


> >From: Stevan Miner <miner@xxxxxxxxxxx>
> > Date: 2007/08/25 Sat PM 09:21:34 CDT
> > To: mailing-list@xxxxxxxxxxxxxxxx
> > Subject: Re: IML: Lean burn and exhaust help
>
> Thank you very much. The mechanic told me that the purpose of the who 
> sensors/lean burn is to advance timing, and that I am not getting any 
> timing advance off idle.  He just rebuilt the carb, and it feels right 
> except for right off idle, where it stumbles most of the time.  I will 
> check for the grounding of the tps, and then take whatever info I can to 
> him.  I need to be careful not to come across like an expert, especially 
> since I was an English major.
> Tom
> > 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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