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multimeter challenge.

Old 11-24-2009, 06:35 PM
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Default multimeter challenge.

i know this idea is possible and maybe routine for people on this site. i want to use my fluke meter as a air/fuel meter on my 4.0 jeep. can any body tell me how to go about this?
i mean i would like it to display the air ratio. i guess that would require probing the correct wire and zeroing the meter at a specific volts or somthing?
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Old 11-24-2009, 08:17 PM
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honestly id just get a a/f gauge. they arent that expensive for a narrowband. 20-40bucks depending where you get it from
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Old 11-25-2009, 08:00 AM
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but thats what any body can do. i want to learn how to turn my multimeter into an afr gauge any time. that would be very cool. and cheap in the long run!
Originally Posted by david_mutchler View Post
honestly id just get a a/f gauge. they arent that expensive for a narrowband. 20-40bucks depending where you get it from
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Old 11-25-2009, 10:10 AM
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there is no way to do it and have it show readings that you can use. the stock sensor is useless for anything other than what the ecu uses it for. they are really just an on off switch and while it would show you various voltages while driving, they fall in to a very small window of a useless air/fuel range.

getting a sensor that can read something useful is also just as pointless cause you have to have a controller for them. they need to be heated to a specific point and no amount of putting voltage to it manually will get you there.

so, in short. get a JAW from 14point7.com and program it to run a cheap narrow band gauge from the parts store. or watch it with your multi-meter if thats what you really want to do. i personally dont like to work that hard and would opt for the gauge
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Old 11-25-2009, 11:13 AM
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Default another idea

i thought" since o2 sensor use electricity to communicate with the ecu mabey a multimeter could give me a useable volt or amperage? i found a write up after i searched around. check out www.autospeed.com/A_109878/cms/article.html

the problem i heard is the speed with which a multimeter works isnt fast enough. but this dude did it so mabey some one with some jeep/mopar specific experience might be able to help me. mabey theres a way to tap into the ecu for the reading instead of the o2 sensor?

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Old 11-26-2009, 03:12 AM
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Originally Posted by cherokeebuilder View Post
i thought" since o2 sensor use electricity to communicate with the ecu mabey a multimeter could give me a useable volt or amperage? i found a write up after i searched around. check out www.autospeed.com/A_109878/cms/article.html

the problem i heard is the speed with which a multimeter works isnt fast enough. but this dude did it so mabey some one with some jeep/mopar specific experience might be able to help me. mabey theres a way to tap into the ecu for the reading instead of the o2 sensor?
well i did not read the article mainly becuase im not interested in this subject but i will say that guy who turned his dmm into a a/f guage had a very nice dmm that has a very fast response time. if thats the case you will spend a decent amout of money for a dmm like that and the better (i.e. cost effective and easier) way to do it is to listen to philstubs and get a jaw wideband kit most bang for the buck wb on the market
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Old 11-26-2009, 04:00 PM
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if you want o2 readings why don't you just buy a cheap dlc scanner at auto zone or ebay. I hope you are not trying to tune off of an o2 sensor.
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Old 11-27-2009, 04:10 PM
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Default i have the same dmm

what is a dlc and yes i was trying to go off the o2 sensor , why not?
Originally Posted by brettsb16a2 View Post
if you want o2 readings why don't you just buy a cheap dlc scanner at auto zone or ebay. I hope you are not trying to tune off of an o2 sensor.
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Old 11-27-2009, 05:15 PM
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Originally Posted by cherokeebuilder View Post
what is a dlc and yes i was trying to go off the o2 sensor , why not?
DLC- diagnostic link connector scanner... code reader... what ever you want to call it. The tool you buy that plugs into your 16 pin connector under your dash. OBD2 connector unless you have an older vehicle. What did you do to a cherokee that you need to tune for?
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Old 11-27-2009, 05:18 PM
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O2 sensor and Air Fuel sensor is two different things and you don't tune with a o2 sensor. up at the top you put air sensor so what sensor are you talking about... sounds like o2. Why dont you just get a nice o2 sensor off ebay for like 30 bucks and put it someplace in your car.
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