'04 running rich
 

For those of you who like diagnosing strange problems I have a doozy
for you.

The symptoms are as follows: Very rich smelling exhaust, inside of
tailpipe VERY thickly coated with soot, badly carboned plugs.

I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
gear), done an aceytelene test around the intake and throttle-body
gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
are all over the map over the past 2 months I have gotten from 14 to
33! mpg using the same brand/grade of fuel driving the same routes
every week. I have made NO changes to the vehicle WHAT SO EVER.

This has me stumped.

How about you.

Re: '04 running rich
 

On Tue, 22 May 2007 20:58:35 -0300, kevin.dooks@ns.sympatico.ca wrote:

>For those of you who like diagnosing strange problems I have a doozy
>for you.
>
>The symptoms are as follows: Very rich smelling exhaust, inside of
>tailpipe VERY thickly coated with soot, badly carboned plugs.
>
>I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
>gear), done an aceytelene test around the intake and throttle-body
>gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
>are all over the map over the past 2 months I have gotten from 14 to
>33! mpg using the same brand/grade of fuel driving the same routes
>every week. I have made NO changes to the vehicle WHAT SO EVER.
>
>This has me stumped.
>
>How about you.
Gee, how to reply to my own post, DUH.

Just some more info, the engine is a 4.0L (242 CID), with less than
50,000 km hooked to a 4 spd auto trans with a 3.55 ratio rear end.

One more note there appears to be NO loss of power and NO smoke out of
the tailpipe.

Strange eh?

Kevin

Re: '04 running rich
 

On Tue, 22 May 2007 20:58:35 -0300, kevin.dooks@ns.sympatico.ca wrote:

>For those of you who like diagnosing strange problems I have a doozy
>for you.
>
>The symptoms are as follows: Very rich smelling exhaust, inside of
>tailpipe VERY thickly coated with soot, badly carboned plugs.
>
>I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
>gear), done an aceytelene test around the intake and throttle-body
>gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
>are all over the map over the past 2 months I have gotten from 14 to
>33! mpg using the same brand/grade of fuel driving the same routes
>every week. I have made NO changes to the vehicle WHAT SO EVER.
>
>This has me stumped.
>
>How about you.
Gee, how to reply to my own post, DUH.

Just some more info, the engine is a 4.0L (242 CID), with less than
50,000 km hooked to a 4 spd auto trans with a 3.55 ratio rear end.

One more note there appears to be NO loss of power and NO smoke out of
the tailpipe.

Strange eh?

Kevin

Re: '04 running rich
 

On Tue, 22 May 2007 20:58:35 -0300, kevin.dooks@ns.sympatico.ca wrote:

>For those of you who like diagnosing strange problems I have a doozy
>for you.
>
>The symptoms are as follows: Very rich smelling exhaust, inside of
>tailpipe VERY thickly coated with soot, badly carboned plugs.
>
>I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
>gear), done an aceytelene test around the intake and throttle-body
>gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
>are all over the map over the past 2 months I have gotten from 14 to
>33! mpg using the same brand/grade of fuel driving the same routes
>every week. I have made NO changes to the vehicle WHAT SO EVER.
>
>This has me stumped.
>
>How about you.
Gee, how to reply to my own post, DUH.

Just some more info, the engine is a 4.0L (242 CID), with less than
50,000 km hooked to a 4 spd auto trans with a 3.55 ratio rear end.

One more note there appears to be NO loss of power and NO smoke out of
the tailpipe.

Strange eh?

Kevin

Re: '04 running rich
 

On Tue, 22 May 2007 20:58:35 -0300, kevin.dooks@ns.sympatico.ca wrote:

>For those of you who like diagnosing strange problems I have a doozy
>for you.
>
>The symptoms are as follows: Very rich smelling exhaust, inside of
>tailpipe VERY thickly coated with soot, badly carboned plugs.
>
>I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
>gear), done an aceytelene test around the intake and throttle-body
>gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
>are all over the map over the past 2 months I have gotten from 14 to
>33! mpg using the same brand/grade of fuel driving the same routes
>every week. I have made NO changes to the vehicle WHAT SO EVER.
>
>This has me stumped.
>
>How about you.
Gee, how to reply to my own post, DUH.

Just some more info, the engine is a 4.0L (242 CID), with less than
50,000 km hooked to a 4 spd auto trans with a 3.55 ratio rear end.

One more note there appears to be NO loss of power and NO smoke out of
the tailpipe.

Strange eh?

Kevin

Re: '04 running rich
 

02 sensors and map sensors come to mind first

kevin.dooks@ns.sympatico.ca wrote:

> For those of you who like diagnosing strange problems I have a doozy
> for you.
>
> The symptoms are as follows: Very rich smelling exhaust, inside of
> tailpipe VERY thickly coated with soot, badly carboned plugs.
>
> I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
> gear), done an aceytelene test around the intake and throttle-body
> gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
> are all over the map over the past 2 months I have gotten from 14 to
> 33! mpg using the same brand/grade of fuel driving the same routes
> every week. I have made NO changes to the vehicle WHAT SO EVER.
>
> This has me stumped.
>
> How about you.

Re: '04 running rich
 

02 sensors and map sensors come to mind first

kevin.dooks@ns.sympatico.ca wrote:

> For those of you who like diagnosing strange problems I have a doozy
> for you.
>
> The symptoms are as follows: Very rich smelling exhaust, inside of
> tailpipe VERY thickly coated with soot, badly carboned plugs.
>
> I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
> gear), done an aceytelene test around the intake and throttle-body
> gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
> are all over the map over the past 2 months I have gotten from 14 to
> 33! mpg using the same brand/grade of fuel driving the same routes
> every week. I have made NO changes to the vehicle WHAT SO EVER.
>
> This has me stumped.
>
> How about you.

Re: '04 running rich
 

02 sensors and map sensors come to mind first

kevin.dooks@ns.sympatico.ca wrote:

> For those of you who like diagnosing strange problems I have a doozy
> for you.
>
> The symptoms are as follows: Very rich smelling exhaust, inside of
> tailpipe VERY thickly coated with soot, badly carboned plugs.
>
> I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
> gear), done an aceytelene test around the intake and throttle-body
> gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
> are all over the map over the past 2 months I have gotten from 14 to
> 33! mpg using the same brand/grade of fuel driving the same routes
> every week. I have made NO changes to the vehicle WHAT SO EVER.
>
> This has me stumped.
>
> How about you.

Re: '04 running rich
 

02 sensors and map sensors come to mind first

kevin.dooks@ns.sympatico.ca wrote:

> For those of you who like diagnosing strange problems I have a doozy
> for you.
>
> The symptoms are as follows: Very rich smelling exhaust, inside of
> tailpipe VERY thickly coated with soot, badly carboned plugs.
>
> I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
> gear), done an aceytelene test around the intake and throttle-body
> gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
> are all over the map over the past 2 months I have gotten from 14 to
> 33! mpg using the same brand/grade of fuel driving the same routes
> every week. I have made NO changes to the vehicle WHAT SO EVER.
>
> This has me stumped.
>
> How about you.

Re: '04 running rich
 

<kevin.dooks@ns.sympatico.ca> wrote in message
news:3tv653tadjqjj9g8ddf2tifm70jp151jh3@4ax.com...
> For those of you who like diagnosing strange problems I have a doozy
> for you.
>
> The symptoms are as follows: Very rich smelling exhaust, inside of
> tailpipe VERY thickly coated with soot, badly carboned plugs.
>
> I have checked the following: Manifold vacuum (20 ish in/Hg at idle in
> gear), done an aceytelene test around the intake and throttle-body
> gaskets/assemblys. The OBD system reports NO PROBLEMS, the mpg figures
> are all over the map over the past 2 months I have gotten from 14 to
> 33! mpg using the same brand/grade of fuel driving the same routes
> every week. I have made NO changes to the vehicle WHAT SO EVER.
>



I seriously doubt your Jeep can run rich and not throw an OBD II code as a
result. The O2 Sensor(s) are looking at the rich/lean condition, both before
and after the CAT.