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?

honestly id just get a a/f gauge. they arent that expensive for a narrowband. 20-40bucks depending where you get it from

i know
 

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!

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

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?

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

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.

i have the same dmm
 

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?

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.

a turbo
 

im getting everything ready for my first turbo. im learning about them at the same time. the o2 sensor in my stock jeep is narrowband?, and to monitor air/fuel you need a wideband o2 sensor? iv heard of the obd2 method of finding a/f ratio. what kind can you get for cheaper than a $200 complete wideband setup? and why doesnt every one use the obd2 way of monitoring. after my homemade header is done i may just install and tune at school with one of there scan tools.

I mean get an O2 sensor gauge not the actual sensor. I have a glow shift 02 gauge that i hooked near the ecu from when my civic was N/A and it worked great... looks cool too. if you want to tune you need to buy a wide band o2 (air fuel) gauge and you can use it to trick your computer to think you still have a narrow band. I use a innovate LC-1 that i got from xenocron. You have to order the gauge too. They may have a package deal... not sure. Very very accurate wide band which was proven when i was working at a dyno shop.

You must get this in your head now... nothing will be cheap when you turbo especially a jeep. Its the electonics that get expensive. You can cheap out on the mechanical side though. I don't know what you can do to your jeep as for obd2... you might have to spend alot for a standalone (if available) or maybe use a AFC hack (apexi), a BTM (msd), and the Wide band. Not sure if you can use a AFC on a jeep but maybe. I know you have a map sensor but probably a maf sensor too... it may still work. Unless there is a standalone unit... your only other option is the AFC, BTM, and Wide band. YOur looking at around 800 for all that used on ebay. YOU MUST DO SOME MORE RESEARCH ON A JEEP. Find out what others are doing on a jeep website.