Jeep Cherokee XJ Forum

Discuss the Jeep Cherokee XJ with others.

You are not logged in.

#1 02-21-2012 14:08:16

Stein
Helper
Registered: 05-27-2009
Posts: 30

88XJ smog

I think I'm going to try to get it smogged today.  I ran two tanks of fuel through it since I got it running again.  It runs good and is getting good mileage.  All I have to do is replace the heat riser tube for visual.

You guys have all recommended iso-heat, acetone and/or isopropyl alcohol.  Is one better than the other?  Is there someplace up here near me where I can buy one of these in bulk?

I've changed the oil, cleaned and oiled the K&N and it has fresh plugs.  Other than a couple gallons of one of the additives and having it nice and warm does anybody else have any other suggestions?  This XJ has failed smog once.  After that I replaced everything that could be related including all of the vacuum lines and cat.  It then smogged great.  I just don't like having it fail.

Offline

02-21-2012 14:08:16

Ads

Re: 88XJ smog

#2 02-21-2012 14:09:37

kev
Rookie
Registered: 09-27-2008
Posts: 76

Re: 88XJ smog

Iso heet like 3 bucks or less at autozone for the yellow bottle. Just use one. Have your tank near full for a better evap test. Make sure you have a fresh oil change.

Offline

#3 02-21-2012 14:57:52

Stein
Helper
Registered: 05-27-2009
Posts: 30

Re: 88XJ smog

Almost 250,000 miles.

15 mph: HC/max 87/average 43/ meas. 44.  CO/max  .75 /average .14/ meas. .11.  NO/max 714/average 344/meas. 7.

25 mph: HC/max 73/average 34/measured 51.  CO/max .95/average .16/ meas. .17.  NO/max 616/average 276/meas. 0.

Offline

#4 02-21-2012 15:14:47

bj
Rookie
Registered: 05-18-2009
Posts: 76

Re: 88XJ smog

very nice!  dont forget the acetone next time you need to smog.  :)

Offline

#5 02-21-2012 15:15:39

Kacul
Helper
Registered: 03-25-2009
Posts: 25

Re: 88XJ smog

Passed mine back in december 248k. Only problem was the 33s on the dyno

Offline

#6 02-21-2012 15:35:17

scooter
Helper
Registered: 10-05-2008
Posts: 16

Re: 88XJ smog

Do you think 33's with 3.55Gears will pass? I have about 7 days to figure it out. If not do you suggest putting the stock ones on.

Offline

#7 02-21-2012 15:35:43

endocryn
Helper
Registered: 04-28-2009
Posts: 22

Re: 88XJ smog

I passed with 33's and 3.55

Offline

#8 02-21-2012 15:36:36

ken
Newbie
Registered: 10-05-2008
Posts: 5

Re: 88XJ smog

Why would tire size and gearing make it not pass?

Offline

#9 02-21-2012 16:19:28

bj
Rookie
Registered: 05-18-2009
Posts: 76

Re: 88XJ smog

larger tires change your gear ratio (just like changing the axle ring & pinion) thus making the engine turn lower rpms to run the same mph.  this will negatively affect your passing smog.

Offline

#10 02-21-2012 16:20:31

kram
Rookie
Registered: 05-24-2009
Posts: 80

Re: 88XJ smog

My numbers were better at 25mph than at 15mph.  At least on my civic.
NOX was way higher at 15mph than 25mph.

Offline

Board footer