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engine predetonation?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by graywolf2011, Jun 13, 2012.

  1. Jun 13, 2012 at 8:15 PM
    #1
    graywolf2011

    graywolf2011 [OP] Well-Known Member

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    Orlando Florida
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    undercover hard toneau, stainless steel nfab step bars
    My 2011 Taco 4.0L V6 started making a engine "rattling sound", like pinging, but not as "tenny" sounding. Its hard to describe, it happens at low speed, 35mph or below, under very light acceleration(enough to maintain speed). It sounds like it is going to ping and just "rattles" instead. I took it to dealer and they said its normal :rolleyes: They called tech services and the guy told them he has a 2012 Taco that makes the same noise, said it is the VVTI. I tried a tank of premium and the noise stopped :confused: which kinda doesn't support the VVTI theory. Anyone else experience this "rattling noise"?
     
  2. Jun 13, 2012 at 8:40 PM
    #2
    BlackSeven

    BlackSeven Grab your helmet, this shits about to get retarded

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    Toytec Ultimate Lift kit, Toytec Rear AAL, 4.88 Gears, ARB Rear locker, Doug Thorley header, Volant Cold Air Intake, Demello Offroad front high clearance bumper, ARB On board Air compressor, BLHM, Wet Okoles, 2011 Color matched grill, Weathertech mats, 4x Innovations Sliders, ATO Engine Skid plate, ATO High lift bed mounts.
    The solution is to hook up one of the Toyota diagnostic computers and look for knock events in the ecu. If its out of specification it will throw a check engine light but they should be able to see the knock count in the ecu anyway. Bad gas will cause pinging, even crappy gas (in this area that would be wawa and royal farms). Try filling up at a shell station with regular and see if it knocks.
     
  3. Jun 14, 2012 at 4:27 PM
    #3
    iroh

    iroh Well-Known Member

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    Mine will ping like that on regular gas every time. I just run premium instead, although most of it is gone on midgrade.

    If you get a lot of pinging even in those sporadic situations, the ECU starts to pull timing everywhere (I've seen it happen real-time on the ultragauge) and cruising mileage will take a dump until it tries to bring it back up again.
     
  4. Oct 28, 2013 at 11:36 AM
    #4
    TacoMan31

    TacoMan31 Member

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    My 2012 does the same and it really pisses me off. Dealer swears up and down that its not an issue. I run premium too.
     

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