shadow tree tuning using O2 sensor - Pirate4x4.Com : 4x4 and Off-Road Forum

jeepinislife · 07-07-2003, 02:06 PM

Hi:

Is it a good idea to fit an O2 sensor to the exhaust and take its readings witn an Ohmeter while tuning up the carb?.

Comments are welcome,

Arrow · 07-07-2003, 07:02 PM

It can be done.
Get an O2 sensor that is heated ( 4 wire )
search the web , you can find write-ups on how to do it.
One thing to remember is that they only measure oxygen, not unburned fuel.
All said , I think that for the price they make a good tool for fine tuning.
good luck

frankenfab · 07-07-2003, 07:23 PM

O2 sensors are like a small battery. The difference between oxygen in the exhaust and oxygen outside the sensor cause it to produce a voltage.

.1 volt is lean

.9 volt is rich

.45 is centerline (about 14.7:1 air/fuel ratio)

They don't produce a voltage unless they are hot, so get a heated one.

Also note that 14.7:1 is a cruise ratio. A computer ignores the O2 sensor during acceleration or deceleration.

Damage, Inc. · 07-07-2003, 08:00 PM

Yep...keep in mind they're very much steady-state devices. Which means that data you're seeing happend along time ago (engine-speak).

WindRider · 07-08-2003, 10:12 AM

One thing to keep in mind here is that an O2 sensor is a voltage device, I.E. it puts out a voltage while operating. Hooking a ohmmeter to it will usually blow them up. They do not like voltage applied to their sensor wire.

07-07-2003, 02:06 PM	#1 (permalink)
jeepinislife Registered User Join Date: Jun 2003 Member # 20625 Location: Caracas - Venezuela Posts: 100	shadow tree tuning using O2 sensor Hi: Is it a good idea to fit an O2 sensor to the exhaust and take its readings witn an Ohmeter while tuning up the carb?. Comments are welcome,

07-07-2003, 07:02 PM	#2 (permalink)
Arrow Registered User Join Date: Feb 2000 Member # 49 Location: SacraTomato Posts: 681	It can be done. Get an O2 sensor that is heated ( 4 wire ) search the web , you can find write-ups on how to do it. One thing to remember is that they only measure oxygen, not unburned fuel. All said , I think that for the price they make a good tool for fine tuning. good luck __________________ Tom Ok so it's not extreme but it gets dirty! The Heartbeat of America Yesterday's Chevy Truck!

07-07-2003, 07:23 PM	#3 (permalink)
frankenfab Registered User Join Date: Apr 2003 Member # 18989 Location: Utah Posts: 526	O2 sensors are like a small battery. The difference between oxygen in the exhaust and oxygen outside the sensor cause it to produce a voltage. .1 volt is lean .9 volt is rich .45 is centerline (about 14.7:1 air/fuel ratio) They don't produce a voltage unless they are hot, so get a heated one. Also note that 14.7:1 is a cruise ratio. A computer ignores the O2 sensor during acceleration or deceleration. __________________ A flash of lightning illuminated the object, wretch, hideous, filthy daemon. A new species would bless me as its creator.

07-08-2003, 10:12 AM	#5 (permalink)
WindRider Registered User Join Date: Feb 2003 Member # 17366 Location: Sacramento, Ca Posts: 148	One thing to keep in mind here is that an O2 sensor is a voltage device, I.E. it puts out a voltage while operating. Hooking a ohmmeter to it will usually blow them up. They do not like voltage applied to their sensor wire. __________________ There are no problems that can not be solved with the proper application of high explosives.

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07-07-2003, 08:00 PM	#4 (permalink)
Damage, Inc. Rock God Join Date: Jun 2003 Member # 20298 Location: Colorado Posts: 1,153	Yep...keep in mind they're very much steady-state devices. Which means that data you're seeing happend along time ago (engine-speak).