97 and older models don't need the KatBox. It's mainly for 98 and
newer.
(However, I did the same to my truck as well as removing the cat
temporarily and after installing the KatBox, it idled smoother and runs
much better overall...this is compared to with my high-flow cat an the
rear O2 installed.
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net] On Behalf Of Ragnarok
Sent: Sunday, July 15, 2001 3:39 AM
To: dakota-truck@buffnet.net
Subject: Re: DML: Aft O2 'simulator'
Bob Tom wrote:
> An owner of a '99 Dak is looking to remove his cat.
> Anyone know of some sources for a fix to the aft
> O2 sensor problem? TIA.
>
I just took the cat off my 97 and while preparing to do this, my buddy
and I brainstormed and this is what we came up with: the aft sensor
doesn't actually affect how the engine runs, it's just there to satisfy
OBD2 laws, to double-check that the cat is working. when properly
functioning, it passes a voltage of between 100 and 900 millivolts,
averaging 400. Logically, this is slightly lower than the sensor
upstream of the cat. Less oxygen, less voltage. So in order to create a
false reading after the cat is gone, wire in a resistor in the negative
lead that will drop the voltage just enough, say 250 millivolts, 1/4
volt. Offhand I don't know how many ohms that is, not much I'd assume.
You must leave the sensor in the exhaust because it only functions
properly at its operating temperature of around 600 degrees.
HOWEVER, after taking the cat off my truck, it runs great, hasn't
thrown any codes, and the check engine light hasn't come on. *shrug*
Haven't touched the sensors.
Oh, and the exhaust is noticeably louder. ;-)
William
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:02:06 EDT