Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem is,
have moved to CA from TX - in CA they test for NOX - CO and CO2 readings are
excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
engine was running too lean, thus failed NOX. Looking for a fix, larger
injectors?? Just advance the timing?? Need to find out - trying to
regeister in CA - but need to pass Smog

--
Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Is your EGR working? That is supposed to cut out NOx by cooling the top
end I think.

Geese, I got 589 NOx on my manually tuned (no computer) BBD (POS) carb
in my CJ7 on a recent test and I don't even have a catalytic converter,
just a straight pipe to a Dynomax turbo muffler.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

"Tate Austin via CarKB.com" wrote:
>
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Is your EGR working? That is supposed to cut out NOx by cooling the top
end I think.

Geese, I got 589 NOx on my manually tuned (no computer) BBD (POS) carb
in my CJ7 on a recent test and I don't even have a catalytic converter,
just a straight pipe to a Dynomax turbo muffler.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

"Tate Austin via CarKB.com" wrote:
>
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Is your EGR working? That is supposed to cut out NOx by cooling the top
end I think.

Geese, I got 589 NOx on my manually tuned (no computer) BBD (POS) carb
in my CJ7 on a recent test and I don't even have a catalytic converter,
just a straight pipe to a Dynomax turbo muffler.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

"Tate Austin via CarKB.com" wrote:
>
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Hi Tate,
I'm surprised he didn't fail you for the injection, as any variance
from stock needs certification. Was your CJ a Kalifornia car to begin
with, or a state requiring a catalytic converter? NOX is it's job:
http://auto.howstuffworks.com/catalytic-converter2.htm Anyway, a new
converter will solve your problem.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"Tate Austin via CarKB.com" wrote:
>
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Hi Tate,
I'm surprised he didn't fail you for the injection, as any variance
from stock needs certification. Was your CJ a Kalifornia car to begin
with, or a state requiring a catalytic converter? NOX is it's job:
http://auto.howstuffworks.com/catalytic-converter2.htm Anyway, a new
converter will solve your problem.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"Tate Austin via CarKB.com" wrote:
>
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Hi Tate,
I'm surprised he didn't fail you for the injection, as any variance
from stock needs certification. Was your CJ a Kalifornia car to begin
with, or a state requiring a catalytic converter? NOX is it's job:
http://auto.howstuffworks.com/catalytic-converter2.htm Anyway, a new
converter will solve your problem.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

"Tate Austin via CarKB.com" wrote:
>
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Like Bill said, the cat helps take care of NOx, but it needs to be at
operating temperature for it to function like it should. Take your Jeep for
a good highway run right before you take it in for the test, and it will
help immensely.

Chris

"Tate Austin via CarKB.com" <u23830@uwe> wrote in message
news:62e877555aa13@uwe...
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem
> is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings
> are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Like Bill said, the cat helps take care of NOx, but it needs to be at
operating temperature for it to function like it should. Take your Jeep for
a good highway run right before you take it in for the test, and it will
help immensely.

Chris

"Tate Austin via CarKB.com" <u23830@uwe> wrote in message
news:62e877555aa13@uwe...
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem
> is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings
> are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com

Re: Jeep CJ7 Mopar MPFI - Failed California Smog Test
 

Like Bill said, the cat helps take care of NOx, but it needs to be at
operating temperature for it to function like it should. Take your Jeep for
a good highway run right before you take it in for the test, and it will
help immensely.

Chris

"Tate Austin via CarKB.com" <u23830@uwe> wrote in message
news:62e877555aa13@uwe...
> Have had the MPFI on my CJ-7 for several years. Very satisfied. Problem
> is,
> have moved to CA from TX - in CA they test for NOX - CO and CO2 readings
> are
> excellent - failed NOX. Tester (reliable; actually a "Referee" )said the
> engine was running too lean, thus failed NOX. Looking for a fix, larger
> injectors?? Just advance the timing?? Need to find out - trying to
> regeister in CA - but need to pass Smog
>
> --
> Message posted via http://www.carkb.com