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2012 5.7 Fuel density woes..

Discussion in 'Performance and Tuning' started by Allover, Dec 3, 2019.

  1. Dec 3, 2019 at 7:35 AM
    #1
    Allover

    Allover [OP] New Member

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    Hello fellow Tundra folks. Thanks for having me on here. I was following a couple of threads about fuel density settings and extended cranking in cold weather.. I’ve been having those issues for a while. I had been using premium gas which seemed to fix things.. I forgot and filled up with regular two days ago. Had a hard start yesterday morning then this morning same extended cranking but followed by nothing at all. Starter won’t turn over now. Tested the battery. It’s good, any tips? Thanks in advance...
     
    OR18TRD likes this.
  2. Dec 3, 2019 at 8:22 AM
    #2
    14burrito

    14burrito IG @14burrito

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    Load test the battery or just check voltage?

    Voltage could be OK but the battery could still be bad.
     
    TTund16 likes this.
  3. Mar 20, 2020 at 8:23 PM
    #3
    TexasArdnut

    TexasArdnut New Member

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    If your battery voltage is below 11.3 it’s bad. Low voltage indicates a sulfated plate and drops your amperage to almost zero. You can have all the voltage in the world but without amps you won’t light a light bulb.

    Your problem is not regular fuel, being 85-87 octane, which is what your engine was designed for. Stop using 89, 91, or 93 octane. You’re robbing your engine of power and creating unburned fuel deposits in your cylinders and exhaust system. Your engine is a low compression engine with a ratio below 9.5:1. Use regular gas always. If you are forced to put in a high octane during a trip, dilute it with regular as soon as you can.

    I recommend you go to the dealer and have them do a fuel system cleaning. It will restore your engine to it’s new running condition, as far as the fuel system is concerned.
     
  4. Mar 21, 2020 at 8:58 PM
    #4
    Tundra_power

    Tundra_power New Member

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    How many times are you giving out the wrong information. First our engines are 10:2 1 not below 9:5 1. And second nothing is wrong putting in 93 octane even in any cr. 5.7 has variable valve timing with intelligence which therefore adapts to octane alot better than most engines. Timing is being pulled alot like max out. This is what dap said and prove...


    As we have reported with every truck we have tested on, 4.6L, 4.7L, 5.7L, all run best on 91+ octane weather they are completely stock with stock tune, or tuned. These engines pull 8-12 degrees of timing due to knock retard on 87 oct, 6-10 deg on 89oct, 2-6 deg on 91oct, and 0-2deg on 93oct. That is on a completely stock truck with factory tune.

    If you care about the engine in your $35,000-$65,000 truck as you think you do, you wont run anything but premium in it weather you are tuned or not tuned."
     
    Metro14536 and TXTundra2722 like this.
  5. Mar 22, 2020 at 3:24 AM
    #5
    GNTundra

    GNTundra The Notorious Troll Sniper

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