'90 Wrangler won't pass smog! - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 21 Old 06-16-2013, 11:41 AM Thread Starter
runhot
Registered User
1990 YJ Wrangler 
 
Join Date: Jun 2013
Location: Corona
Posts: 5
'90 Wrangler won't pass smog!

I have more than 6k invested in my Wrangler, new engine, trans, top, brakes, radiator, hubs, battery, carb, etc. and it still won't pass California smog. I have had the 02 sensor replaced, cat converter was changed out 2 yrs ago, it has a new carb, timing set, new plugs, wires, etc and it comes close but still won't pass smog. I have all this $ invested for use in snow area where I will be living. (my life could depend on this jeep) I really need to use it! My mechanic (who has never let me down ever) can't seem to figure it out. Any help would be appreciated!

runhot is offline  
Sponsored Links
Advertisement
 
post #2 of 21 Old 06-16-2013, 12:06 PM
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego
Posts: 18,064
Garage
post the numbers

.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline  
post #3 of 21 Old 06-16-2013, 01:53 PM Thread Starter
runhot
Registered User
1990 YJ Wrangler 
 
Join Date: Jun 2013
Location: Corona
Posts: 5
Emissions

I will have to get them from my mechanic but as I recall he said the hydrocarbons were the problem. (I thought this was odd because the converter isn't very old)
runhot is offline  
post #4 of 21 Old 06-16-2013, 04:50 PM
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
How did he set up and tune the carb?

Have you checked for blocked idle bleeds, happens even on brand new carbs with the bad gas sold these days.

Is your mechanic using an exhaust gas analyzer to set it? This is a must where you are, can't be guessing on it.

418 miles on 19 gallons of gas. Can't beat the BBD !
Old4X is offline  
post #5 of 21 Old 06-16-2013, 05:03 PM
youngjeepr
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2009
Location: layton UT
Posts: 2,522
A TEMPORARY fix is run your tank down to about 1/8 tank premium then add 4 quarts of rubbing alcohol it will much run cleaner after you pass go full up with premium

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

Utah Jeep Crew



Build Thread
youngjeepr is offline  
post #6 of 21 Old 06-16-2013, 05:05 PM
youngjeepr
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2009
Location: layton UT
Posts: 2,522
The 5.7 in my jeep just has cherry bombs and my HCs are 80 when I add rubbing alcohol and 140 without. I also have a fairly lopey cam.

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

Utah Jeep Crew



Build Thread
youngjeepr is offline  
post #7 of 21 Old 06-16-2013, 05:08 PM
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
Quote:
Originally Posted by youngjeepr View Post
A TEMPORARY fix is run your tank down to about 1/8 tank premium then add 4 quarts of rubbing alcohol it will much run cleaner after you pass go full up with premium
Better check it with a sniffer first.

Rubbing alcohol has water in it.

418 miles on 19 gallons of gas. Can't beat the BBD !
Old4X is offline  
post #8 of 21 Old 06-16-2013, 05:17 PM
youngjeepr
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2009
Location: layton UT
Posts: 2,522
Not enough to harm your engine in that small of amount... But I would check how your carb is tuned and read your plugs. And possibly put some hotter plugs in

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

Utah Jeep Crew



Build Thread
youngjeepr is offline  
post #9 of 21 Old 06-16-2013, 05:23 PM
jollyroger1
Registered User
1990 YJ Wrangler 
 
Join Date: Oct 2011
Location: Nashville
Posts: 36
If it is really close creating a small vacuum leak can sometimes work ,it did for me last year
jollyroger1 is offline  
post #10 of 21 Old 07-20-2013, 10:17 AM Thread Starter
runhot
Registered User
1990 YJ Wrangler 
 
Join Date: Jun 2013
Location: Corona
Posts: 5
Thanks eveyone, it finally squeaked by with 87 on the hydrocrabons!
runhot is offline  
post #11 of 21 Old 07-20-2013, 10:25 AM Thread Starter
runhot
Registered User
1990 YJ Wrangler 
 
Join Date: Jun 2013
Location: Corona
Posts: 5
Turns out the new carb had to be tossed (ouch) it didn't have the recall mods required for california, That meant another $340 to rebuild the old one. My mistake for buying a new Rallye brand Carb online. (warranty already expired waiting for engine and trans rebuild)
runhot is offline  
post #12 of 21 Old 07-20-2013, 10:28 AM Thread Starter
runhot
Registered User
1990 YJ Wrangler 
 
Join Date: Jun 2013
Location: Corona
Posts: 5
The problem was hydrocarbons at 15 mph... who drives 15 mph anyway!!!
runhot is offline  
post #13 of 21 Old 07-20-2013, 06:35 PM
rocketboy
Senior Member
 
rocketboy's Avatar
1989 YJ Wrangler 
 
Join Date: Jun 2011
Location: Houston
Posts: 509
I'm waiting for a new carb to come in to try to pass here in Texas.

I'm interested in this rubbing alcohol thing. If I understand what was posted above, I leave 1/8 tank of premium in and then add 4 quarts of rubbing alcohol? 4 QUARTS? What comes in the drugstore is pints. Do you really mean quarts or do you mean the pint bottles? If you mean quarts, I could get a gallon at the hardware store. But I don't want to add too much...
rocketboy is offline  
post #14 of 21 Old 07-20-2013, 06:46 PM
youngjeepr
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2009
Location: layton UT
Posts: 2,522
I meant pints sorry. And the rubbing alcohol trick should just be used as a temporary fix until you can fix it properly... Also after you pass the test fill Your tank with premium fuel again.

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

Utah Jeep Crew



Build Thread
youngjeepr is offline  
post #15 of 21 Old 07-20-2013, 06:55 PM
rocketboy
Senior Member
 
rocketboy's Avatar
1989 YJ Wrangler 
 
Join Date: Jun 2011
Location: Houston
Posts: 509
OK cool, thanks! Understand, I don't want to run like that all the time but I just need to pass the test. It's the last time, too. Next year she'll be 25 and exempt here.
rocketboy is offline  
Reply

Tags
smog

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome