Emissions...Failed! - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Emissions...Failed!

JK specific skid plates from Clayton Off Road Mfg.RCV Heavy Duty Axle Shafts Now Shipping at Baseline4x4.comStainless Steel Door Hinge Pins

Reply
Unread 07-13-2013, 06:51 AM   #1
JHo303
Registered User
1987 YJ Wrangler 
 
Join Date: Jun 2013
Location: Highlands Ranch, CO
Posts: 18
Emissions...Failed!

Well, failed the first try...didnt have alot of hope. After fixing idle problems by cleaning out the venturi tubes (thnx Forum), Jeep runs great until you stick your foot in it too far. Then it bogs down really bad. Failed on "High HC" (unburned fuel) and "High CO" (air/fuel mix too rich). Stock Carter BBD and air cleaner. It does have a whistle that is consistent with engine RPM, which I assume is a vacuum leak. Is that where I start to just get it through emissions?
Thanks, Jim

JHo303 is offline   Reply With Quote
Unread 07-13-2013, 02:16 PM   #2
jokerchief462
Wild Wheeler
 
jokerchief462's Avatar
1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City, Nevada
Posts: 2,828
Yes that would be a good place to start. Also check this site for some good info.

Smogtips.com
__________________
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
jokerchief462 is offline   Reply With Quote
Unread 07-13-2013, 03:18 PM   #3
Old4X
Registered User
1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 4,153
What is the altitude at your test site? There is a high altitude jumper for YJs based above 4,000 ft msl (or close, cna't remember the exact figure). You will be out os spec on the rich side if you do not use the jumper.

It is mentioned in the factory maint manual, and has been written up here several times.
__________________
Rust free YJ for sale. Need more room in barn.
Old4X is online now   Reply With Quote
Unread 07-14-2013, 06:03 AM   #4
jay-h
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2006
Location: , NJ
Posts: 4,081
I've got some stock carb & hookup parts if you need them.
__________________
My toys
'89 Wrangler YJ
'47 CJ2-A

wife's toys
97 Grand Cherokee (ZJ)
87 MB 560SL roadster
jay-h is offline   Reply With Quote
Unread 07-14-2013, 07:37 AM   #5
JHo303
Registered User
1987 YJ Wrangler 
 
Join Date: Jun 2013
Location: Highlands Ranch, CO
Posts: 18
Thanks for the replies...think I'll just sell out and get the Howell TBI
JHo303 is offline   Reply With Quote
Unread 07-14-2013, 08:07 AM   #6
laybackman
Bikini Bridge Inspector
 
laybackman's Avatar
1995 YJ Wrangler 
 
Join Date: Dec 2002
Location: Massachusetts
Posts: 5,592
Quote:
Originally Posted by JHo303 View Post
Thanks for the replies...think I'll just sell out and get the Howell TBI
Not to pee in your pool but that may only lighten your wallet but not fix your problem. You don't just slap on the TB set up and drive off into the sunset.

If you have a vacuum leak, find it! Stick your head under the hood while it is running and find the leak first. You may only need to tighten the bolts that hold the carb on the intake.

Spend you $$$ on something else!

Keep this in mind....that YJ of yours ran perfect at one time. Find out what changed and fix it!
__________________
"Once good behavior becomes the exception and not the rule your society has begun to fail…..we are there." laybackman

If your girl is throwing gang signs with her toes you're hitting the spot.

"If we cannot afford to take care of Veterans, then we should stop making them."
David C. Wilker Jr. USAF (RET)
laybackman is offline   Reply With Quote
Unread 07-14-2013, 08:49 AM   #7
SLCSmoker
Registered User
1990 YJ Wrangler 
 
Join Date: Nov 2012
Location: SLC, Utah
Posts: 54
I disagree completely with the above post. I went through all this about 8 months ago. Ripped off the carb and put howell FI on. Best $ I've spent on the Heep. The vacuum system is 100x simpler with the howell and it passed emissions cleaner than the stock vehicle brand new. Its not a waste of $$. I say do it and save yourself a ton of headaches with the POS stock carb. It also allows you to tear out about 60 feet of redundant wiring and really clean everything up.
SLCSmoker is offline   Reply With Quote
Unread 07-14-2013, 10:19 AM   #8
NonRubicon
Registered User
1990 YJ Wrangler 
 
Join Date: Nov 2009
Location: The southern armpit of California
Posts: 1,980
If you want the upgrade to simplify the setup and get better performance, then do the Howell. But be careful thinking that the Howell will solve all problems. Double check your intake manifold - retorque all the bolts to spec and do the carb spray trick to check for vacuum leaks. The Howell will not fix a bad intake/exhaust manifold gasket, nor will it fix a crack in the exhaust manifold and both can cause a fail. So, if you are set on doing the Howell, I highly recommend you track down that vacuum leak whistle, before doing the kit. And for good measure make sure the exhaust manifold doesn't have any cracks. That'll cause a rich condition too by messing with the O2 sensor.

With that said, I found the Howell to be a vast improvement in simplicity and increased performance over the OEM setup. I used to spend entire weekends under the hood f-ing with the OEM setup trying to diagnose and track down a simple problem. A TBI setup like the Howell is what Jeep should have put on the 4.2L YJ in the first place, but I suppose it was easier and cheaper to just keep using the CJ components.
NonRubicon is offline   Reply With Quote
Unread 07-14-2013, 11:47 AM   #9
The_Goob
Hell on Wheels
 
The_Goob's Avatar
1991 YJ Wrangler 
 
Join Date: Jun 2012
Location: Walcott, IA
Posts: 1,652
Sometimes Im glad I live in Iowa and dont have to do emissions :P
The_Goob is offline   Reply With Quote
Unread 07-14-2013, 07:21 PM   #10
jay-h
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2006
Location: , NJ
Posts: 4,081
While it's true the Howell can't solve all the problems, it gets rid of a lot of the vacuum lines and controls and meters the fuel more accurately. Assuming your engine is decent it should work. I'm quite pleased with mine

Keep in mind that there are two Howell versions, only one is actually EPA approved. Both may well pass the sniffer test but in a lot of places you need the approved one.
__________________
My toys
'89 Wrangler YJ
'47 CJ2-A

wife's toys
97 Grand Cherokee (ZJ)
87 MB 560SL roadster
jay-h is offline   Reply With Quote
Unread 07-16-2013, 08:44 PM   #11
JHo303
Registered User
1987 YJ Wrangler 
 
Join Date: Jun 2013
Location: Highlands Ranch, CO
Posts: 18
$1375.00 including shipping and a new Prom that lets us wheel at higher elevation. Going to replace the intake gasket while I wait for the Howell to get here. Should be a hoot!
JHo303 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.