93 Jeep Wrangler - 57K miles - fails CA smog
01-20-2007, 11:10 PM
#41
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
Thanks for the responses.
Yeh, it seemed like the EGR. So I started checking for replacement EGRs
for my Jeep.
Cannot find any at any site.
I have a service manual and so I looked up EGR.
Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
have one.
It might be regulated by the computer. Maybe the hose is plugged or
something.
Jim.
Outatime wrote:
> High NO usually indicates a problem with the EGR valve, plugged EGR
> passages or a leak in the EGR vacuum circuit. I had the same problem
> with another vehicle last year, and a replacement EGR valve solved the
> problem.
>
> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> OEM part regardless of cost. I learned this lesson the hard way.
Yeh, it seemed like the EGR. So I started checking for replacement EGRs
for my Jeep.
Cannot find any at any site.
I have a service manual and so I looked up EGR.
Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
have one.
It might be regulated by the computer. Maybe the hose is plugged or
something.
Jim.
Outatime wrote:
> High NO usually indicates a problem with the EGR valve, plugged EGR
> passages or a leak in the EGR vacuum circuit. I had the same problem
> with another vehicle last year, and a replacement EGR valve solved the
> problem.
>
> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> OEM part regardless of cost. I learned this lesson the hard way.
01-20-2007, 11:24 PM
#42
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
My Haynes manual mentions an "EGR Solenoid" for later models. It's not a
very good manual because it tries to cover too many years. Check the
Vehicle Emissions Control Information label under the hood, if it is still
there. That is really the only reliable indicator, for what emissions
control equipment you actually have. They come right off with steam
cleaning.
Earle
<kaigoneq@yahoo.com> wrote in message
news:1169352602.329755.47330@38g2000cwa.googlegrou ps.com...
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
> > High NO usually indicates a problem with the EGR valve, plugged EGR
> > passages or a leak in the EGR vacuum circuit. I had the same problem
> > with another vehicle last year, and a replacement EGR valve solved the
> > problem.
> >
> > Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> > OEM part regardless of cost. I learned this lesson the hard way.
>
very good manual because it tries to cover too many years. Check the
Vehicle Emissions Control Information label under the hood, if it is still
there. That is really the only reliable indicator, for what emissions
control equipment you actually have. They come right off with steam
cleaning.
Earle
<kaigoneq@yahoo.com> wrote in message
news:1169352602.329755.47330@38g2000cwa.googlegrou ps.com...
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
> > High NO usually indicates a problem with the EGR valve, plugged EGR
> > passages or a leak in the EGR vacuum circuit. I had the same problem
> > with another vehicle last year, and a replacement EGR valve solved the
> > problem.
> >
> > Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> > OEM part regardless of cost. I learned this lesson the hard way.
>
01-20-2007, 11:24 PM
#43
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
My Haynes manual mentions an "EGR Solenoid" for later models. It's not a
very good manual because it tries to cover too many years. Check the
Vehicle Emissions Control Information label under the hood, if it is still
there. That is really the only reliable indicator, for what emissions
control equipment you actually have. They come right off with steam
cleaning.
Earle
<kaigoneq@yahoo.com> wrote in message
news:1169352602.329755.47330@38g2000cwa.googlegrou ps.com...
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
> > High NO usually indicates a problem with the EGR valve, plugged EGR
> > passages or a leak in the EGR vacuum circuit. I had the same problem
> > with another vehicle last year, and a replacement EGR valve solved the
> > problem.
> >
> > Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> > OEM part regardless of cost. I learned this lesson the hard way.
>
very good manual because it tries to cover too many years. Check the
Vehicle Emissions Control Information label under the hood, if it is still
there. That is really the only reliable indicator, for what emissions
control equipment you actually have. They come right off with steam
cleaning.
Earle
<kaigoneq@yahoo.com> wrote in message
news:1169352602.329755.47330@38g2000cwa.googlegrou ps.com...
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
> > High NO usually indicates a problem with the EGR valve, plugged EGR
> > passages or a leak in the EGR vacuum circuit. I had the same problem
> > with another vehicle last year, and a replacement EGR valve solved the
> > problem.
> >
> > Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> > OEM part regardless of cost. I learned this lesson the hard way.
>
01-20-2007, 11:24 PM
#44
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
My Haynes manual mentions an "EGR Solenoid" for later models. It's not a
very good manual because it tries to cover too many years. Check the
Vehicle Emissions Control Information label under the hood, if it is still
there. That is really the only reliable indicator, for what emissions
control equipment you actually have. They come right off with steam
cleaning.
Earle
<kaigoneq@yahoo.com> wrote in message
news:1169352602.329755.47330@38g2000cwa.googlegrou ps.com...
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
> > High NO usually indicates a problem with the EGR valve, plugged EGR
> > passages or a leak in the EGR vacuum circuit. I had the same problem
> > with another vehicle last year, and a replacement EGR valve solved the
> > problem.
> >
> > Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> > OEM part regardless of cost. I learned this lesson the hard way.
>
very good manual because it tries to cover too many years. Check the
Vehicle Emissions Control Information label under the hood, if it is still
there. That is really the only reliable indicator, for what emissions
control equipment you actually have. They come right off with steam
cleaning.
Earle
<kaigoneq@yahoo.com> wrote in message
news:1169352602.329755.47330@38g2000cwa.googlegrou ps.com...
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
> > High NO usually indicates a problem with the EGR valve, plugged EGR
> > passages or a leak in the EGR vacuum circuit. I had the same problem
> > with another vehicle last year, and a replacement EGR valve solved the
> > problem.
> >
> > Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> > OEM part regardless of cost. I learned this lesson the hard way.
>
01-20-2007, 11:24 PM
#45
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
My Haynes manual mentions an "EGR Solenoid" for later models. It's not a
very good manual because it tries to cover too many years. Check the
Vehicle Emissions Control Information label under the hood, if it is still
there. That is really the only reliable indicator, for what emissions
control equipment you actually have. They come right off with steam
cleaning.
Earle
<kaigoneq@yahoo.com> wrote in message
news:1169352602.329755.47330@38g2000cwa.googlegrou ps.com...
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
> > High NO usually indicates a problem with the EGR valve, plugged EGR
> > passages or a leak in the EGR vacuum circuit. I had the same problem
> > with another vehicle last year, and a replacement EGR valve solved the
> > problem.
> >
> > Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> > OEM part regardless of cost. I learned this lesson the hard way.
>
very good manual because it tries to cover too many years. Check the
Vehicle Emissions Control Information label under the hood, if it is still
there. That is really the only reliable indicator, for what emissions
control equipment you actually have. They come right off with steam
cleaning.
Earle
<kaigoneq@yahoo.com> wrote in message
news:1169352602.329755.47330@38g2000cwa.googlegrou ps.com...
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
> > High NO usually indicates a problem with the EGR valve, plugged EGR
> > passages or a leak in the EGR vacuum circuit. I had the same problem
> > with another vehicle last year, and a replacement EGR valve solved the
> > problem.
> >
> > Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
> > OEM part regardless of cost. I learned this lesson the hard way.
>
01-21-2007, 01:14 AM
#46
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
On 20 Jan 2007 20:10:02 -0800, kaigoneq@yahoo.com wrote:
>Thanks for the responses.
>Yeh, it seemed like the EGR. So I started checking for replacement EGRs
>for my Jeep.
>Cannot find any at any site.
>I have a service manual and so I looked up EGR.
>Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
>have one.
>It might be regulated by the computer. Maybe the hose is plugged or
>something.
Give up on the EGR already. It doesn't have EGR.
Anything that increases combustion temp can cause high NOx. Carbon
buildup, wrong spark plugs, slow O2...
To get the right stuff out of the cat, you need the right stuff going
in. Unlike the old days when leaner was better, to control NOx, the
cat needs some CO to get the job done. A large exhaust leak could
contribute to high NOx numbers.
>
>Jim.
>
>
>Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
>Thanks for the responses.
>Yeh, it seemed like the EGR. So I started checking for replacement EGRs
>for my Jeep.
>Cannot find any at any site.
>I have a service manual and so I looked up EGR.
>Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
>have one.
>It might be regulated by the computer. Maybe the hose is plugged or
>something.
Give up on the EGR already. It doesn't have EGR.
Anything that increases combustion temp can cause high NOx. Carbon
buildup, wrong spark plugs, slow O2...
To get the right stuff out of the cat, you need the right stuff going
in. Unlike the old days when leaner was better, to control NOx, the
cat needs some CO to get the job done. A large exhaust leak could
contribute to high NOx numbers.
>
>Jim.
>
>
>Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
01-21-2007, 01:14 AM
#47
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
On 20 Jan 2007 20:10:02 -0800, kaigoneq@yahoo.com wrote:
>Thanks for the responses.
>Yeh, it seemed like the EGR. So I started checking for replacement EGRs
>for my Jeep.
>Cannot find any at any site.
>I have a service manual and so I looked up EGR.
>Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
>have one.
>It might be regulated by the computer. Maybe the hose is plugged or
>something.
Give up on the EGR already. It doesn't have EGR.
Anything that increases combustion temp can cause high NOx. Carbon
buildup, wrong spark plugs, slow O2...
To get the right stuff out of the cat, you need the right stuff going
in. Unlike the old days when leaner was better, to control NOx, the
cat needs some CO to get the job done. A large exhaust leak could
contribute to high NOx numbers.
>
>Jim.
>
>
>Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
>Thanks for the responses.
>Yeh, it seemed like the EGR. So I started checking for replacement EGRs
>for my Jeep.
>Cannot find any at any site.
>I have a service manual and so I looked up EGR.
>Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
>have one.
>It might be regulated by the computer. Maybe the hose is plugged or
>something.
Give up on the EGR already. It doesn't have EGR.
Anything that increases combustion temp can cause high NOx. Carbon
buildup, wrong spark plugs, slow O2...
To get the right stuff out of the cat, you need the right stuff going
in. Unlike the old days when leaner was better, to control NOx, the
cat needs some CO to get the job done. A large exhaust leak could
contribute to high NOx numbers.
>
>Jim.
>
>
>Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
01-21-2007, 01:14 AM
#48
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
On 20 Jan 2007 20:10:02 -0800, kaigoneq@yahoo.com wrote:
>Thanks for the responses.
>Yeh, it seemed like the EGR. So I started checking for replacement EGRs
>for my Jeep.
>Cannot find any at any site.
>I have a service manual and so I looked up EGR.
>Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
>have one.
>It might be regulated by the computer. Maybe the hose is plugged or
>something.
Give up on the EGR already. It doesn't have EGR.
Anything that increases combustion temp can cause high NOx. Carbon
buildup, wrong spark plugs, slow O2...
To get the right stuff out of the cat, you need the right stuff going
in. Unlike the old days when leaner was better, to control NOx, the
cat needs some CO to get the job done. A large exhaust leak could
contribute to high NOx numbers.
>
>Jim.
>
>
>Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
>Thanks for the responses.
>Yeh, it seemed like the EGR. So I started checking for replacement EGRs
>for my Jeep.
>Cannot find any at any site.
>I have a service manual and so I looked up EGR.
>Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
>have one.
>It might be regulated by the computer. Maybe the hose is plugged or
>something.
Give up on the EGR already. It doesn't have EGR.
Anything that increases combustion temp can cause high NOx. Carbon
buildup, wrong spark plugs, slow O2...
To get the right stuff out of the cat, you need the right stuff going
in. Unlike the old days when leaner was better, to control NOx, the
cat needs some CO to get the job done. A large exhaust leak could
contribute to high NOx numbers.
>
>Jim.
>
>
>Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
01-21-2007, 01:14 AM
#49
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
On 20 Jan 2007 20:10:02 -0800, kaigoneq@yahoo.com wrote:
>Thanks for the responses.
>Yeh, it seemed like the EGR. So I started checking for replacement EGRs
>for my Jeep.
>Cannot find any at any site.
>I have a service manual and so I looked up EGR.
>Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
>have one.
>It might be regulated by the computer. Maybe the hose is plugged or
>something.
Give up on the EGR already. It doesn't have EGR.
Anything that increases combustion temp can cause high NOx. Carbon
buildup, wrong spark plugs, slow O2...
To get the right stuff out of the cat, you need the right stuff going
in. Unlike the old days when leaner was better, to control NOx, the
cat needs some CO to get the job done. A large exhaust leak could
contribute to high NOx numbers.
>
>Jim.
>
>
>Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
>Thanks for the responses.
>Yeh, it seemed like the EGR. So I started checking for replacement EGRs
>for my Jeep.
>Cannot find any at any site.
>I have a service manual and so I looked up EGR.
>Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
>have one.
>It might be regulated by the computer. Maybe the hose is plugged or
>something.
Give up on the EGR already. It doesn't have EGR.
Anything that increases combustion temp can cause high NOx. Carbon
buildup, wrong spark plugs, slow O2...
To get the right stuff out of the cat, you need the right stuff going
in. Unlike the old days when leaner was better, to control NOx, the
cat needs some CO to get the job done. A large exhaust leak could
contribute to high NOx numbers.
>
>Jim.
>
>
>Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
01-21-2007, 10:28 AM
#50
Guest
Posts: n/a
Re: 93 Jeep Wrangler - 57K miles - fails CA smog
I thought that...
I would be thinking carbon buildup in a vehicle with so few miles on it.
A good high rpm highway run or a good run in 4 low can sometimes blow
the carbon out or a de-carboning job 'will' clean the carbon out for
sure. They have products your mechanic might be able to use or you can
slowly let the engine ingest a pint of water while you keep the revs up
enough to prevent a stall. One of my older vehicles flunked emissions
and I just paid the guy to do an upper cylinder clean. It then passed.
The water shock will clean the carbon out. I use ATF instead of water
for this just because I was taught that way and know it cleans the
combustion chamber like new. When I worked in garages, they use to do
the ATF cleanout on city driven vehicles to get rid of run on and
pinging under load. I always do this before a head gasket job so I have
everything clean for inspection. It makes a massive cloud of smoke though.
I have been told you can use a vacuum line to suck the water into the
intake for this job. Something like the PCV line would do I believe.
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)
kaigoneq@yahoo.com wrote:
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
>
I would be thinking carbon buildup in a vehicle with so few miles on it.
A good high rpm highway run or a good run in 4 low can sometimes blow
the carbon out or a de-carboning job 'will' clean the carbon out for
sure. They have products your mechanic might be able to use or you can
slowly let the engine ingest a pint of water while you keep the revs up
enough to prevent a stall. One of my older vehicles flunked emissions
and I just paid the guy to do an upper cylinder clean. It then passed.
The water shock will clean the carbon out. I use ATF instead of water
for this just because I was taught that way and know it cleans the
combustion chamber like new. When I worked in garages, they use to do
the ATF cleanout on city driven vehicles to get rid of run on and
pinging under load. I always do this before a head gasket job so I have
everything clean for inspection. It makes a massive cloud of smoke though.
I have been told you can use a vacuum line to suck the water into the
intake for this job. Something like the PCV line would do I believe.
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)
kaigoneq@yahoo.com wrote:
> Thanks for the responses.
> Yeh, it seemed like the EGR. So I started checking for replacement EGRs
> for my Jeep.
> Cannot find any at any site.
> I have a service manual and so I looked up EGR.
> Jeep removed the EGR from the wranglers in 1990. So my 1993 does not
> have one.
> It might be regulated by the computer. Maybe the hose is plugged or
> something.
>
> Jim.
>
>
> Outatime wrote:
>> High NO usually indicates a problem with the EGR valve, plugged EGR
>> passages or a leak in the EGR vacuum circuit. I had the same problem
>> with another vehicle last year, and a replacement EGR valve solved the
>> problem.
>>
>> Warning: don't buy an aftermarket EGR valve --they're junk. Go with an
>> OEM part regardless of cost. I learned this lesson the hard way.
>