Performing compression test on a ford with a misfire and high mileage

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  • @stevemabry6718
    @stevemabry6718 23 дні тому +8

    Squirt the cylinder with oil, if compression goes up it's rings, stays down it's valves

  • @lowlife44
    @lowlife44 23 дні тому +8

    The gray coilpacks are duralast brand aka chinesium garbage

    • @TheCrystalGlow
      @TheCrystalGlow 23 дні тому +1

      I’ve never had any issues whatsoever with any of their parts. I’ve been using that brand exclusively since 2009 and it’s never failed me once. If they happen to fail, they have a lifetime no questions asked warranty. It’s Dorman you want to watch out for. I won’t touch those with a 20 foot pole.

    • @goharrisautomotive
      @goharrisautomotive  22 дні тому +2

      I’m glad you realize that. But that was the reason why I didn’t recognize a brand because I don’t install bullshit parts. No professionals use that shit.

    • @lowlife44
      @lowlife44 22 дні тому

      ​@@goharrisautomotiveyup same here,I no longer install customer supplied parts mainly because of them providing the lowest quality parts 😂

  • @nofyfb123
    @nofyfb123 23 дні тому +10

    180K is high? For fraud, it certainly is.
    And when you do compression test, remove ALL spark plugs.

    • @HalferLandPerformance
      @HalferLandPerformance 23 дні тому +1

      That's what I was saying, leak down you only remove the cylinder being tested, compression you remove all of them

    • @goharrisautomotive
      @goharrisautomotive  22 дні тому +1

      Very true. But once I tested that cylinder and it was dead, no reason to test any other other ones. Engine only here at Harris auto considering the miles that’s on there

    • @alb12345672
      @alb12345672 4 дні тому

      @@HalferLandPerformance If the battery is good it won't matter. Also a ford scan tool can do a compression test. you can also do a relative with its neighbor, even with plugs

  • @RickC_
    @RickC_ 17 днів тому +1

    I have had a bad coil cause a misfire and also cause low compression. The low compression cleared up after 100 miles with a new coil and plug.

    • @goharrisautomotive
      @goharrisautomotive  16 днів тому

      I can see that. Cylinders was washed down in your case. But no compression is different.

  • @jimmydafoot75
    @jimmydafoot75 23 дні тому +1

    You can hear the gallop in the motor too .

  • @bjcasarez8557
    @bjcasarez8557 23 дні тому +3

    Guess it wasn’t that spark plug. These aren’t any high-performance high compression engines it does not care what spark plugs in there as long as the gap is good it will run.

    • @brarautorepairs
      @brarautorepairs 21 день тому

      Depends on engines. I've seen some very picky engines. The plug needs to fire inside the cylinder under pressure. Oftentimes, it will fire fine outside the cylinder but struggle under load

  • @doug0537
    @doug0537 23 дні тому +1

    I’ll take the #6 coil and move it to #5, then take the plug and move it to #4 and see where the skip moves. If it stays on #6, you know it’s not ignition.

    • @goharrisautomotive
      @goharrisautomotive  22 дні тому +1

      Yeah. But high mile cars. Do a compression check, saves a lot of extra work. And its the best thing to do.

  • @jacobeigenheer3585
    @jacobeigenheer3585 22 дні тому +1

    AC Delco makes parts for more than just GM vehicles. I have had a AC Delco coolant hose on my VW GTI for over 2 years now. Im not talking about some generic hose either, molded same as the factory one with the quick connects on the end and everything. Part number 27045X

    • @goharrisautomotive
      @goharrisautomotive  21 день тому

      I agree. But I have had issues in my career with misfires due to wrong manufacturer plugs.

  • @toddstidham8374
    @toddstidham8374 13 днів тому

    So long as that AC Delco plug is the correct part number interchange to the motorcraft brand, it should be fine. I've even used motorcraft plugs on my Jeep, because it was what was in stock and the engine ran fine. That plug interchanges to many brands of vehicles, 1998-2021 Fords being one, but also specific years for Dodge/Chryslers, Mazda and Land Rover vehicles. Please don't state inaccurate information if you haven't verified the application.

    • @goharrisautomotive
      @goharrisautomotive  12 днів тому

      From my 33 years of professional experience, I’ve seen the wrong manufacturer, spark plugs, cause misfires more than once. Matter of fact. Several times. But this conversation is irrelevant, Can I please get some credit? I went straight for the compression test? Was that the right thing to do?

  • @TheCrystalGlow
    @TheCrystalGlow 23 дні тому +1

    That D on the coils is Duralast brand. So they’re from autozone.

    • @goharrisautomotive
      @goharrisautomotive  22 дні тому

      Oh. Trash parts. That’s why I don’t recognize it. I guess kudus to me for not knowing.

  • @rowdyazz7519
    @rowdyazz7519 23 дні тому +1

    Collapsed lifter common problem

    • @Mr._Flunky
      @Mr._Flunky 23 дні тому +1

      This isn't an LS bruh

    • @Addison0526
      @Addison0526 23 дні тому

      It’s a ford v6 lol I’m sure it’s OHC and you don’t hear any off noise or ticking while it’s running. It’s just low on compression. Could be several reasons why. Bad headgasket, pistons ring failure, bent valve, out of time, etc.

  • @dudeenglehart6517
    @dudeenglehart6517 23 дні тому +1

    Really question how you don't realize what a duralast looks like. As in any marking that has that Big d shaped like that more than likely a duralast and the only other brand that I can think of offhand that starts with a d is denso but I'm 100% positive that's a duralast coil pack. But you are right though about AC Delco Chevrolet

    • @goharrisautomotive
      @goharrisautomotive  22 дні тому

      Sorry. I don’t buy shit parts. Respectfully. And duralast is the bottom of the bottom. That’s why I don’t recognize the brand No true professionals ever buy and install dura last parts.

    • @dudeenglehart6517
      @dudeenglehart6517 22 дні тому

      @@goharrisautomotive fare point sometimes customers bring them in as well to save a dollar

  • @RONNIEJNZN
    @RONNIEJNZN 5 днів тому +1

    Worn cam lobe from a seized roller lifter ? Valve cover off, measure lift. Seen alot on Hemis

    • @goharrisautomotive
      @goharrisautomotive  3 дні тому +1

      Got a hemi in the shop now. Mis on 5, 120k. Probably going to need cams and lifters.

  • @user-wi2su7zk1f
    @user-wi2su7zk1f 23 дні тому +2

    It seems like you guys get a lot of customers who try to do their own work and fail. At the end they give up and bring it to your shop.

    • @goharrisautomotive
      @goharrisautomotive  22 дні тому +1

      Yes, we see our fair share of that. Or more sadly, another shop attempts to get it right and he cannot.

  • @redbaron6805
    @redbaron6805 23 дні тому

    Cheap and mismatched parts always lead to some kind of a disaster. Just a matter of time...

  • @frankshropshire789
    @frankshropshire789 23 дні тому

    Doing too much hes hunting for bread

    • @neonbelly9491
      @neonbelly9491 23 дні тому

      your brain seems to be incapable of producing a coherent sentence