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View Full Version : 4 O2 sensors on a O2 enhancer??



Roland Jacques
09-19-2008, 07:12 PM
I have 4 O2 sensors 2 before the Cats and 2 after.

How do I use the O2 enhancers with 4 O2 sensors?

This is the enhancer im looking at.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=110290283824

If thier is a better one let me know thank you

richardb200373
09-19-2008, 10:42 PM
From what I have been told and read on many web sites, you only need to worry about the two before the cat. My jeep is the same way.

Roland Jacques
09-19-2008, 11:13 PM
So do you need 2 EFIE for the 2 O2 sensors before the Cats?

Jaxom
09-20-2008, 11:42 AM
Correct, unless you can find a 2-channel EFIE (don't even know if they're available.) The downstream O2's are there strictly for catalytic convertor self-diagnostics.

hygear
09-20-2008, 05:11 PM
Correct, unless you can find a 2-channel EFIE (don't even know if they're available.) The downstream O2's are there strictly for catalytic convertor self-diagnostics.



Fuel-saver.org has a good dual channel efie and Mike stands behind his product with all the help and support you need,without having to wait days or longer for answers.His units go for about $115.00 + shipping.Just make sure to test your sensor voltage to see if you have wideband sensors before you buy and especially install it.Once you've installed it you can't return it.

Hope this helps you out

DaneDHorstead
09-20-2008, 05:24 PM
So do you need 2 EFIE for the 2 O2 sensors before the Cats?
No!
You need only one.
And, the unit you are looking at, cost about twice, what it should cost, unless you specificly are dealing with wideband!

Roland Jacques
09-20-2008, 11:32 PM
No!
You need only one.
And, the unit you are looking at, cost about twice, what it should cost, unless you specificly are dealing with wideband!


This one says it can deal with 2 O2 sensors along with the MAP at the same time. which one would you get if you dont have wideband O2 sensors?


I did already purchace the one above. So how do i tell whether i have wide band or narrow ? and will this one work on ether type? my O2 sensors have 4 wires.

hygear
09-21-2008, 01:42 AM
This one says it can deal with 2 O2 sensors along with the MAP at the same time. which one would you get if you dont have wideband O2 sensors?


I did already purchace the one above. So how do i tell whether i have wide band or narrow ? and will this one work on ether type? my O2 sensors have 4 wires.



Roland, Check out my thread on wideband efie this should clear things up regarding your questions on efie's and narrow and wide band sensors.

hydrotinkerer
09-21-2008, 09:51 AM
This one says it can deal with 2 O2 sensors along with the MAP at the same time. which one would you get if you dont have wideband O2 sensors?


I did already purchace the one above. So how do i tell whether i have wide band or narrow ? and will this one work on ether type? my O2 sensors have 4 wires.

Roland, What kind of vehicle and engine? We'll see if we can figure out which sensors you have.

Roland Jacques
09-21-2008, 10:05 AM
2001 GMC Savanana van 3500 5.7 litter.


Ill look at that thread closer.

hydrotinkerer
09-21-2008, 03:18 PM
2001 GMC Savanana van 3500 5.7 litter.


Ill look at that thread closer.

The EFIE you purchased will work for your o2 sensors. They are narrowband sensors. Usually the signal wire for GM is purple. Test for voltage between
.1 - 1 volt engine hot and running. Voltage will constantly fluctuate up and down.

Roland Jacques
09-22-2008, 11:06 AM
Thank you much

hhocavalier
09-29-2008, 07:51 PM
not to steel your post but i have a question, what happens if i was to put a .45v to my ecu threw the o2 wouldent the ecu see this as perfect mix and not try to ajust?

donnylynn
09-29-2008, 08:12 PM
not to steel your post but i have a question, what happens if i was to put a .45v to my ecu threw the o2 wouldent the ecu see this as perfect mix and not try to ajust?

As I understand it, the ECU is expecting to see a constantly changing signal from the O2 sensor, swinging above and below .45 volts. It would interpret a steady .45 volts as an error and assume the sensor has failed.

hhocavalier
10-01-2008, 12:21 AM
what if i dont cut the o2 i simply add in a .45 volt so it will still fluxuate but wont dip below .45