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5.4 Detonation and fix

Discussion in 'Ford Raptor Engine Discussion and Performance Mods' started by AZ SVT, Nov 30, 2017.

  1. AZ SVT

    AZ SVT Full Access Member

    Likes Received:
    Dec 8, 2010
    Delta Junction, Alaska
    Just to make sure everyone knows the time line here
    Oct 2016: hearing the nasty sounds of detonation, I start trouble shooting.
    1) No check engine light, code scanner shows no codes
    2) Understanding that a lean situation is unlikely with no code, check fuel pressure anyway, fuel pressure is within specs.
    3) Pull plugs, they all look fine, replace plugs anyway.
    4) I have a new set of injectors sitting on the shelf, and though my logical mind says there is no call for it, I install the new set anyway, (and keep the perfectly fine old ones as spares).
    5) To this point there is no change, truck is still pinging and rattling.
    6) Scope the cylinder bores, nothing notable observed.
    7) Start believing what I already know; its not a fuel mixture problem
    8) Start leaning towards a cam/valve timing issue and start getting smart on how the system works
    9) Could be timing chain, cam phaser, tensioner, or the variable timing solenoid. I rule out the chains and tensors, leaving the phasers and timing solenoid.
    10) This is the point where the Sea Foam was recommended.
    11) Thought about it for a day or two. The best mechanic I know, with over 45 years of experience, recommended it. The motor has (had) over 130,000 hard miles on it, and if I crack it open, I'm not going to put it back together without a complete rebuild. So I sack-up and add 1.5 oz per quart (10.5 oz total) with an oil change, 5w-20 Mobil 1.

    That was a year ago. The truck now has 148,000 miles on it, 10k+ after the Sea Foam, including an Alaskan winter, and no detonation since.

    So, you can sit there reading the same regurgitated tribal knowledge, or you can believe me. I did the experiment, the sky didn't fall, and my well maintained, high mileage 5.4 4-valve is still humming along.

    An that's all I have to say about that.

    Jimster58 and Wilson like this.
  2. Snowsled

    Snowsled Full Access Member

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    Oct 2, 2017
    Ridgway CO
    So you bypassed the obvious chain/tensioner/phaser repair, which is what, $700 in parts and a Saturdays work? Instead you dumped diesel and detergent into the motor and it "fixed" it... The excuse for not making the correct repair was that you are not "going in without doing it all" even though the timing gear is superficial to the real guts, which are good for at least another 100k miles.

    That is just retarded. Do you seriously think you fixed it? Maybe you will get lucky and when it comes apart it will tear up a bunch of other stuff you can soak in diesel and fix...

    I am thrilled with you, that this worked. Anybody who thinks this a good way to "fix" their vehicle is just plain crazy though.

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