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Blue Driver OBD2 interface questions

Discussion in '3rd Gen - 2007 - 2017' started by Bigfishfin, Nov 29, 2020.

  1. Bigfishfin

    Bigfishfin Full Access Members

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    Hi gang...Could use some advice from those more knowledgeable than I!...I just bought a Blue Driver OBD2 interface for use when I tow a 7,000 LB. travel trailer. I desire to be informed as much as is reasonably possible as to the "important parameters" of the power train of my truck, especially while under towing stress. So, could y'all let me know which of the below listed "Ford supported parameters" would be most useful for me to track on my iphone as I cruise through the country (five maximum)?

    The "supported" parameters (not including the obvious: coolant temp, etc.) are: Evap. system vapor pressure; Catalyst temp bank 1&2 sensors; Control Module Voltage; Absolute load value; Command Equivalence ratio; Intake Manifold absolute pressure; Timing advance for #1 cylinder; Fuel rail pressure; Command Evaporative purge; Command throttle actuator; Fuel system status; Calculated engine load value; Short term fuel trim bank 1&2; long term fuel trim bank 1&2.

    There are also several "throttle and pedal position" parameters that seem to me to not be critical for viewing during operation, but what do I know?...

    If I could get a brief reason for certain parameters to be viewed during operating that would be most appreciated...

    Thanks to all in advance for this help!...
     
  2. beefychicken

    beefychicken New Member

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    Attempted to provide some insight to each item below with a few recommendations. To anyone reading this, please feel free to correct anything I have wrong. (my experience is with GM and Infiniti).

    Evap. system vapor pressure; Monitors function of the fuel evap system. a problem here could result in a loss of power and possibly rough idle. Not necessary for towing.

    Catalyst temp bank 1&2 sensors; Cat temps, should be the same. Might be useful if you throw a code while towing. Difference would indicate a Cat problem/plugged Cat.

    * Control Module Voltage; Worthy, tracks your Alternator output. That is, of course, if the value is in Volts DC. If it is any other value, then it is not much use.

    Absolute load value; Not sure with Ford, nor do i know the output value. assume it would be engine torque, useful if the output value is easy to understand.

    Command Equivalence ratio; This is the commanded air/fuel ratio, basically its what the ECM wants the A/F to be based on various parameters. Not very useful unless youre running a custom tune and have adjusted this value.

    Intake Manifold absolute pressure; This would be your boost pressure. Fun to watch to know how much boost youre pushing.

    Timing advance for #1 cylinder; Just tracks your timing advance. Not much value, except you can probably see small differences based on fuel type. Valuable if you are running a custom tune as this is a parameter that would be dialed in based on fuel type, eng temps, rpm, etc.

    Fuel rail pressure; Fuel pressure. if it drops, you will know, ha ha ha. but can be tracked by you over the long term to see if the fuel pump might be wearing out. Not much immediate use for towing.

    Command Evaporative purge; The ECM turning on the fuel evap purge valve. Not much use for towing.

    Command throttle actuator; The value your foot is telling the throttle body to move the throttle plate. This would also be tied to the throttle and pedal position values you mentioned. Useful for a custom tune, otherwise...meh...except it would be useful for troubleshooting a no accel issue.

    Fuel system status; Not sure what this reports? Maybe load it and watch it and try to figure out what it does. If you do, let me know what you find out.

    Calculated engine load value; Calculated torque, I believe this is what is used by the transmission to set the pressures for shifting, probably in a % The higher the number, the more demand being requested, the higher the shifting pressures. Should be preset values unless you have a custom tune, in which case this would be useful for ensuring the trans pressures are good.

    Short term fuel trim bank 1&2; Works with Command Equiv Ratio, Tells you what adjustments are needed to keep your A/F ratio at the commanded value of 14.64/1, not needed unless you're using a custom tune and attempting to dial in the A/F ratios

    long term fuel trim bank 1&2. Similar to above, except it adds or subtracts a set % to compensate for a constant (or long term) A/F adjustment. e.g., if the ECM is commanding 14.64, but the O2 snsr keeps reporting that its always a bit lean, then this parameter shows the amount of long term correction needed.

    Hope this helps, its just random knowledge I picked up while tuning my Infiniti and helping a friend who tunes LS's on the side.
     
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  3. LokiWolf

    LokiWolf Full Access Members

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    Blue Driver is a useless OBDII adapter on a Ford. It does not have the ability to use the MSCAN protocol which is what you need to see most of the data you are looking for.

    OBDLINK MX+ is what you should be using if you want a BT LE OBDII adapter to monitor, log, or FORSCAN on any modern Ford.
     
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  4. JasonH

    JasonH Full Access Members

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    Here's my setup.

    Screenshot_20201129-215440.png

    Screenshot_20201129-215429.png
     
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  5. Bigfishfin

    Bigfishfin Full Access Members

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    Thanks a bunch guys! Based on the response y'all gave, I am returning the Blue Driver and just purchased the OBDlink MX+ unit...
     
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