Howell TBI-O2 Sensor problem - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 08-21-2004, 09:00 AM
mohawk82
Guest
 
Posts: n/a
Howell TBI-O2 Sensor problem

I've had the Howell kit on my 1982 CJ-7 4.2L for 6 years without any problems except for a bad O2 sensor. Last week I had my cracked exhaust manifold replaced with a Hedman 6 into 1 header. The place that did the install spliced 3 feet of wire onto the original O2 sensor connection so that they could move the O2 sensor to the exhaust pipe after the header flange.

My problem is that my system is running wide open. The dash light for the O2 sensor goes off when I first start my <nobr>Jeep</nobr>, then stays on the rest of the time. They installed a new O2 sensor with the header, so I do not think that is the problem. Any ideas or suggestions will be appreciated.

Thanks
Mohawk82
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 08-21-2004, 10:01 AM
 
Join Date: Mar 2002
Posts: 325
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Howell TBI-O2 Sensor problem

Have you tried swapping out the O2 sensor for one from another vehicle that is running well - in other words, a known good one? I know it sounds silly, but just because a part is new doesn't mean it is good. You'll find lots of people that have chased ghosts for a while before finally checking the "new" part and finding their problem.

Another possible cause is a vacuum or manifold leak (could be intake or exhaust). An easy way to check for vacuum leaks is with a burnable carb cleaner. As RRich has pointed out countless times on this forum, not all carb cleaners are burnable. If you spray it directly in the intake and the RPMs go up - it's burnable.

Of course, I would also put a multimeter to the extended wire's leads and make sure they didn't hose that up on you. [img]images/graemlins/tongue.gif[/img]
highfill is offline  
post #3 of (permalink) Old 08-21-2004, 10:33 AM
mohawk82
Guest
 
Posts: n/a
Re: Howell TBI-O2 Sensor problem

Thanks for the quick suggestions. I ordered another O2 sensor yesterday. The wire continuity checks good. I'll get some cleaner and check for leaks next.

Thanks again,
Mohawk82
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 08-21-2004, 10:36 AM
Can't Get Enough
 
jeeperjohn's Avatar
 
Join Date: Sep 1999
Location: The Plywood State.... Florida
Posts: 1,340
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Howell TBI-O2 Sensor problem

My guess is that the 02 sensor is not getting hot enough to function properly. It may be necessary to add a heated sensor.
jeeperjohn is offline  
post #5 of (permalink) Old 08-21-2004, 03:12 PM
Way Outta Control
 
Join Date: Sep 1999
Location: The Palouse
Posts: 13,432
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: Howell TBI-O2 Sensor problem

1. I'm with JeeperJohn on this one.
2. The O2 sensor needs LOTS of heat to work.
3. Moving it further down the pipe...
4. Is a recipe for disaster ( the header installer should know better ).
5. I'd agree to go to a heated sensor,
6. And see what happens.
7. I'd also advise using the Paper Clip trick,
8. To recover the codes to confirm your suspicions...
LEVE is offline  
post #6 of (permalink) Old 08-22-2004, 12:49 PM
mohawk82
Guest
 
Posts: n/a
Re: Howell TBI-O2 Sensor problem

Thank you all for the advice. I found some leaks from my old smog pump connections. Once I'ved fixed these, I hope that my problem is solved. If not, the heated O2 sensor is next. I will post what finally works.

Thanks again,
Mohawk82
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not 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 On
Pingbacks are On
Refbacks are On

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