Okay I know my old exhaust manifold is leaking, and is at it's worst
when cold so I'm wondering if a leaking manifold could fool the O2
sensor and cause the Cater stepper motor to go too rich, until the
engine gets a little warm (at which point the manifold has expanded from
the heat and sealed things up a little better) and then leans out.

Would an exhaust leak before the O2 sensor cause rich or lean? In other
words would the sensor detect MORE O2 (lean) causing the computer to go
too rich?

I'm about to get out and check the stepper metering pins to make sure
I've actually got a rich condition (pins all the way forward) and watch
it to see if it's backing down as the engine warms up.

--
Simon
"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

 

More than likely your Oxygen Sensor is history, kind of like up
plugging it, it richens it, and has destroyed your catalytic convert by
now.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Simon Juncal wrote:
>
> Okay I know my old exhaust manifold is leaking, and is at it's worst
> when cold so I'm wondering if a leaking manifold could fool the O2
> sensor and cause the Cater stepper motor to go too rich, until the
> engine gets a little warm (at which point the manifold has expanded from
> the heat and sealed things up a little better) and then leans out.
>
> Would an exhaust leak before the O2 sensor cause rich or lean? In other
> words would the sensor detect MORE O2 (lean) causing the computer to go
> too rich?
>
> I'm about to get out and check the stepper metering pins to make sure
> I've actually got a rich condition (pins all the way forward) and watch
> it to see if it's backing down as the engine warms up.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

 

More than likely your Oxygen Sensor is history, kind of like up
plugging it, it richens it, and has destroyed your catalytic convert by
now.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Simon Juncal wrote:
>
> Okay I know my old exhaust manifold is leaking, and is at it's worst
> when cold so I'm wondering if a leaking manifold could fool the O2
> sensor and cause the Cater stepper motor to go too rich, until the
> engine gets a little warm (at which point the manifold has expanded from
> the heat and sealed things up a little better) and then leans out.
>
> Would an exhaust leak before the O2 sensor cause rich or lean? In other
> words would the sensor detect MORE O2 (lean) causing the computer to go
> too rich?
>
> I'm about to get out and check the stepper metering pins to make sure
> I've actually got a rich condition (pins all the way forward) and watch
> it to see if it's backing down as the engine warms up.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

 

More than likely your Oxygen Sensor is history, kind of like up
plugging it, it richens it, and has destroyed your catalytic convert by
now.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Simon Juncal wrote:
>
> Okay I know my old exhaust manifold is leaking, and is at it's worst
> when cold so I'm wondering if a leaking manifold could fool the O2
> sensor and cause the Cater stepper motor to go too rich, until the
> engine gets a little warm (at which point the manifold has expanded from
> the heat and sealed things up a little better) and then leans out.
>
> Would an exhaust leak before the O2 sensor cause rich or lean? In other
> words would the sensor detect MORE O2 (lean) causing the computer to go
> too rich?
>
> I'm about to get out and check the stepper metering pins to make sure
> I've actually got a rich condition (pins all the way forward) and watch
> it to see if it's backing down as the engine warms up.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein

 

Simon, I just had this problem. I had a bad leak before the o2 sensor and
my engine ran increadibly rich. It was mis-firing and failed emissions
badly. I just had the leak fixed and my Jeep now runs great as a direct
result.
Nick

"Simon Juncal" <SPAMERSSUCK@usefirstinitialandlastnameATerols.com > wrote in
message news:3FEDEA58.1060702@usefirstinitialandlastnameAT erols.com...
> Okay I know my old exhaust manifold is leaking, and is at it's worst
> when cold so I'm wondering if a leaking manifold could fool the O2
> sensor and cause the Cater stepper motor to go too rich, until the
> engine gets a little warm (at which point the manifold has expanded from
> the heat and sealed things up a little better) and then leans out.
>
> Would an exhaust leak before the O2 sensor cause rich or lean? In other
> words would the sensor detect MORE O2 (lean) causing the computer to go
> too rich?
>
> I'm about to get out and check the stepper metering pins to make sure
> I've actually got a rich condition (pins all the way forward) and watch
> it to see if it's backing down as the engine warms up.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
>

 

Simon, I just had this problem. I had a bad leak before the o2 sensor and
my engine ran increadibly rich. It was mis-firing and failed emissions
badly. I just had the leak fixed and my Jeep now runs great as a direct
result.
Nick

"Simon Juncal" <SPAMERSSUCK@usefirstinitialandlastnameATerols.com > wrote in
message news:3FEDEA58.1060702@usefirstinitialandlastnameAT erols.com...
> Okay I know my old exhaust manifold is leaking, and is at it's worst
> when cold so I'm wondering if a leaking manifold could fool the O2
> sensor and cause the Cater stepper motor to go too rich, until the
> engine gets a little warm (at which point the manifold has expanded from
> the heat and sealed things up a little better) and then leans out.
>
> Would an exhaust leak before the O2 sensor cause rich or lean? In other
> words would the sensor detect MORE O2 (lean) causing the computer to go
> too rich?
>
> I'm about to get out and check the stepper metering pins to make sure
> I've actually got a rich condition (pins all the way forward) and watch
> it to see if it's backing down as the engine warms up.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
>

 

Simon, I just had this problem. I had a bad leak before the o2 sensor and
my engine ran increadibly rich. It was mis-firing and failed emissions
badly. I just had the leak fixed and my Jeep now runs great as a direct
result.
Nick

"Simon Juncal" <SPAMERSSUCK@usefirstinitialandlastnameATerols.com > wrote in
message news:3FEDEA58.1060702@usefirstinitialandlastnameAT erols.com...
> Okay I know my old exhaust manifold is leaking, and is at it's worst
> when cold so I'm wondering if a leaking manifold could fool the O2
> sensor and cause the Cater stepper motor to go too rich, until the
> engine gets a little warm (at which point the manifold has expanded from
> the heat and sealed things up a little better) and then leans out.
>
> Would an exhaust leak before the O2 sensor cause rich or lean? In other
> words would the sensor detect MORE O2 (lean) causing the computer to go
> too rich?
>
> I'm about to get out and check the stepper metering pins to make sure
> I've actually got a rich condition (pins all the way forward) and watch
> it to see if it's backing down as the engine warms up.
>
> --
> Simon
> "I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
>

 

The O2 sensor is ignored until the engine is warmed up, junior.


In message <3FEDEA58.1060702@usefirstinitialandlastnameATerol s.com>, "Simon
Juncal" wrote:

>Okay I know my old exhaust manifold is leaking, and is at it's worst
>when cold so I'm wondering if a leaking manifold could fool the O2
>sensor and cause the Cater stepper motor to go too rich, until the
>engine gets a little warm (at which point the manifold has expanded from
>the heat and sealed things up a little better) and then leans out.
>
>Would an exhaust leak before the O2 sensor cause rich or lean? In other
>words would the sensor detect MORE O2 (lean) causing the computer to go
>too rich?
>
>I'm about to get out and check the stepper metering pins to make sure
>I've actually got a rich condition (pins all the way forward) and watch
>it to see if it's backing down as the engine warms up.

 

The O2 sensor is ignored until the engine is warmed up, junior.


In message <3FEDEA58.1060702@usefirstinitialandlastnameATerol s.com>, "Simon
Juncal" wrote:

>Okay I know my old exhaust manifold is leaking, and is at it's worst
>when cold so I'm wondering if a leaking manifold could fool the O2
>sensor and cause the Cater stepper motor to go too rich, until the
>engine gets a little warm (at which point the manifold has expanded from
>the heat and sealed things up a little better) and then leans out.
>
>Would an exhaust leak before the O2 sensor cause rich or lean? In other
>words would the sensor detect MORE O2 (lean) causing the computer to go
>too rich?
>
>I'm about to get out and check the stepper metering pins to make sure
>I've actually got a rich condition (pins all the way forward) and watch
>it to see if it's backing down as the engine warms up.

 

The O2 sensor is ignored until the engine is warmed up, junior.


In message <3FEDEA58.1060702@usefirstinitialandlastnameATerol s.com>, "Simon
Juncal" wrote:

>Okay I know my old exhaust manifold is leaking, and is at it's worst
>when cold so I'm wondering if a leaking manifold could fool the O2
>sensor and cause the Cater stepper motor to go too rich, until the
>engine gets a little warm (at which point the manifold has expanded from
>the heat and sealed things up a little better) and then leans out.
>
>Would an exhaust leak before the O2 sensor cause rich or lean? In other
>words would the sensor detect MORE O2 (lean) causing the computer to go
>too rich?
>
>I'm about to get out and check the stepper metering pins to make sure
>I've actually got a rich condition (pins all the way forward) and watch
>it to see if it's backing down as the engine warms up.