I have an early 1995 F350 7.3 DIT

I can feel and hear a miss, though it runs pretty well and it's been this way since I got it a year ago. Now that it's getting chilly at night, the truck starts a little hard and smokes when it starts up, so I'd like to give it a little love -- Hopefully find a bad injector to fix the miss and some glow plugs that are 20 years and 140k miles newer would probably help.

So my question is has anyone done a power balance / cylinder contribution / drop test using an android phone and wireless obd2 interface device? Is there an app that does it?

I have the Torque Pro app, but haven't figured out how to do it.

Do I have to spring for a more expensive diagnostic tool or manually unplug injectors to get a power balance test?

Also, I notice my temperatures are out of whack in the Torque Pro app -- oil is about 50* coolant is 212* and air intake is -40* I haven't played with this enough to verify all those numbers-- oil could be 50*, but coolant is not 212 and air is not -40

So in light of this data and the OEM temp gauge in the dash that shows almost nothing, which in my limited experience is normal, I ordered a mechanical temp gage to swap in like I did on my old '94 IDI. But now that I think about it, I wonder if it will mess up anything in the truck's brain if I remove the electrical temp sensor and put in a mechanical one? Does it matter which one I go for --the gage sensor or the idiot light sensor? This worked great on my IDI, but that thing has no brain.

Thanks in advance!

 

The trucks "brain" uses the engine oil temp to set fuel and other functions, I believe. So using a mechanical gauge won't hurt anything. I would use the temp light I think. Then you could see the difference between the original gauge reading and the mechanical one.

 

There shouldn't be any coolant reading with the TorquePro app as the 7.3 does not have a temp sensor that feeds into the ECU. As previously stated the ECU uses the EOT to determine fueling and other functions. Look below for the custom PID that I found will work with IAT. My IAT read like yours until I found this PID for it on another forum. For EOT I had to change the unit from F to C to get it to read in Fahrenheit even though all my setting are already set up for F and other US units of measure. It looks like your reading for EOT is in Celsius.

Mode/PID: 22114A
Long name: IATf OBS
Short name: IATf
Min value: 0
Max value: 100
Scale: x1
Unit: °F
Equation: (((A*256)+B)*-0.00314)+193.34
Header: C410F1

 

You need Car Guage Pro for buzz and contribution tests. It's kind of a pain in the butt, but it works.