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Resetting Computer After Mods?

Discussion in 'Performance and Tuning' started by Coyboy 0351, Nov 16, 2011.

  1. Nov 16, 2011 at 6:22 AM
    #1
    Coyboy 0351

    Coyboy 0351 [OP] Well-Known Member

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    I heard that you have to pull a certain fuse or disconnect battery cables after you add a CAI to reset the computer so the Mass Air will read the increased air flow? True or False?
     
  2. Nov 16, 2011 at 6:27 AM
    #2
    jjew18

    jjew18 the Nightman cometh!

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    Sub'ed for the answer, but I would think yes. Just like your PC with any major hardware or OS update, you usually have to do a hard reboot.
     
  3. Nov 16, 2011 at 6:42 AM
    #3
    acdronin

    acdronin Well-Known Member

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    No, the MAF is going to read the increased airflow regardless of re-setting the computer. I put a CAI on my 07 and here's what I found: The intake increased the airflow but i think that had more to do with the fact that i removed the secondary air filter than anything else. It increased throttle response big time and yes there is an increase in power BUT, it also decreased my MPG's. This is what I learned the hard way: Because you removed the stock intake, you changed the airflow dynamics, this changed the data that the MAF sent to the ECU (your truck's computer), which meant that the computer thinks the truck needs more fuel than it really does so it dumps more fuel into the engine, hence the MPG's go down. Now the truck is running rich. I installed a MAF Calibrator from URD which needed to be soldered into the wiring harness of the ECU (not REAL complicated but i was VERY careful not to fuck this up), and this corrected the MAF data which leaned out the truck and for the most part my MPG's came back. Not a perfect solution but in hindsight I think I would have just tore out the secondary air filter, I think I would have got the same increase in throttle response.
     
  4. Nov 16, 2011 at 7:16 AM
    #4
    Coyboy 0351

    Coyboy 0351 [OP] Well-Known Member

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    Thanks... I took off my 2ng gen TRD CAI because the gas mileage was killin me. I put the stock intake back on and the gas mileage is still shitty...
     
  5. Nov 30, 2011 at 7:57 AM
    #5
    Vassily28

    Vassily28 Well-Known Member

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    You should reset the ECU when changing something like intake system (air filter, CAI, Headers) or exhaust that will change air flow in the system. Th purpose of this reset is to clear the short trim and long trim correction in closed loop part of the EFI.

    Your MPG will go down not cause you're running rich (With stock electronic, it's impossible in closed loop). If there is more air, the ECU has to inject more fuel to keep a steady AFR.

    The installation of a MAF calibrator will not has any effects on the closed loop operation. The purpose of the MAF is to optimize the power you can get from your mods by richening the mixture in opened loop (WOT) and get richer AFR (less than 14.7).

    And to finish, dont forget that power increase = fuel consumption increase.:eek:
     
  6. Dec 2, 2011 at 8:14 AM
    #6
    Coyboy 0351

    Coyboy 0351 [OP] Well-Known Member

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    Thanks... So how do you resest ECU? My gas milage stayed shitty after I put the stock intake back on.. I only am running flowmaster exhaust now. Its almost due for its check up at the dealership... Wait and have them reset or can I reset it?
     
  7. Dec 2, 2011 at 8:25 AM
    #7
    Alby9999

    Alby9999 Well-Known Member

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  8. Dec 2, 2011 at 8:28 AM
    #8
    Vassily28

    Vassily28 Well-Known Member

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    Just disconnect the battery for 1 min. :)
     
  9. Dec 2, 2011 at 9:26 AM
    #9
    Coyboy 0351

    Coyboy 0351 [OP] Well-Known Member

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    Will give it a shot... Thanks
     
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