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  • Okay..... really off the wall question

    Does anyone know what sort of resistance reading (in ohms) I should expect from a glow plug ? I have 4 plugs and 3 are about 0.1ohms (allowing for test leads) and the fourth is 1ohm.

    It looks to me like number 4 is kn4ckerd.... any thoughts ?
    [center][font=Microsoft Sans Serif][size=7][color=magenta][u][b][img]http://www.gifs.net/animate/hipgrl12.gif[/img][/b][/u][/color][/size] [img]http://www.gifs.net/animate/hipmn1.gif[/img][/font][/center][center][img]http://homepage.ntlworld.com/jim_ashton/shyAV5.jpg[/img][/center][center][b][color=#ff00ff][size=7][u]E[/u][/size][u][size=5]ms [/size][size=5]&[/size][size=7] J[/size][size=5]im[/size][/u][/color][/b][/center]

  • #2
    Originally posted by Ems and Jim
    Does anyone know what sort of resistance reading (in ohms) I should expect from a glow plug ? I have 4 plugs and 3 are about 0.1ohms (allowing for test leads) and the fourth is 1ohm.

    It looks to me like number 4 is kn4ckerd.... any thoughts ?
    Jim just looked im my Toyota repair manual.

    Standard resistance at 20deg (68deg F) Approx 0.65ohms.
    That is between the glow plug terminal and ground.

    Geoff.
    Rubblebags (Geoff).

    Comment


    • #3
      Originally posted by rubblebags
      Jim just looked im my Toyota repair manual.

      Standard resistance at 20deg (68deg F) Approx 0.65ohms.
      That is between the glow plug terminal and ground.

      Geoff.
      The glow plug resistor is Approx 0.17ohms

      Geoff.
      Rubblebags (Geoff).

      Comment


      • #4
        Originally posted by rubblebags
        Jim just looked im my Toyota repair manual.

        Standard resistance at 20deg (68deg F) Approx 0.65ohms.
        That is between the glow plug terminal and ground.

        Geoff.
        Cheer Geoff, you're a star

        Makes me feel better... I allowed .4 for the crap leads on the crap meter, without that i get 3 plugs at .6 and one at around 1.2........ TOOOOOO HIGH methinks !

        Good, had a row with the man who fitted my engine, reckoning he'd tested them and my engine was just old & tired !... Yeah, tested them by checking they got hot TW4T !!!!!!!!!!
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        • #5
          Originally posted by Ems and Jim
          Cheer Geoff, you're a star

          Makes me feel better... I allowed .4 for the crap leads on the crap meter, without that i get 3 plugs at .6 and one at around 1.2........ TOOOOOO HIGH methinks !

          Good, had a row with the man who fitted my engine, reckoning he'd tested them and my engine was just old & tired !... Yeah, tested them by checking they got hot TW4T !!!!!!!!!!
          take the oil filler cap off when its running at normal temp if it breathes he's right
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          • #6
            Originally posted by Ems and Jim
            Cheer Geoff, you're a star

            Makes me feel better... I allowed .4 for the crap leads on the crap meter, without that i get 3 plugs at .6 and one at around 1.2........ TOOOOOO HIGH methinks !

            Good, had a row with the man who fitted my engine, reckoning he'd tested them and my engine was just old & tired !... Yeah, tested them by checking they got hot TW4T !!!!!!!!!!
            Jim it says if there is no continuity replace them.?

            Geoff.
            Rubblebags (Geoff).

            Comment


            • #7
              Just applied Ohms law to your number four and it appears to be knackered. It won't get hot enough to warm u[a a pasty. It is needing a change.
              It's only a hobby!

              Comment


              • #8
                Originally posted by kitesurf_phil
                Just applied Ohms law to your number four and it appears to be knackered. It won't get hot enough to warm u[a a pasty. It is needing a change.
                This was my theory..... dredged the triangle out of my head and came up with the wrong number (about 10amps)

                I reckoned that 1, 2 and 3 are pulling near 20 amps each number 4 is struggling with 10.... bingo ! 20+20+20+20 = 80.... what size is the glow plug fuse ? Its a wild guess, but as I have 4 spare glow plugs why not !


                As for breathing.... no it doesn't but thanks for the suggestion.
                [center][font=Microsoft Sans Serif][size=7][color=magenta][u][b][img]http://www.gifs.net/animate/hipgrl12.gif[/img][/b][/u][/color][/size] [img]http://www.gifs.net/animate/hipmn1.gif[/img][/font][/center][center][img]http://homepage.ntlworld.com/jim_ashton/shyAV5.jpg[/img][/center][center][b][color=#ff00ff][size=7][u]E[/u][/size][u][size=5]ms [/size][size=5]&[/size][size=7] J[/size][size=5]im[/size][/u][/color][/b][/center]

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                • #9
                  Originally posted by rubblebags
                  Jim it says if there is no continuity replace them.?

                  Geoff.
                  S'okay Geoff.... my meter (jap £2.50 cheapo kept at home for fiddling - the good stuff £250+ stays at the yard with the posh tools and the alarm & insurance !) reads 0 for full continuity and "1____.0" for Over range (no continuity) the higher the resistance figure, the less the continuity.... so 0.6 is good and 1.2 is baaaad. NO continuity at all means a totally dead plug - broken element etc.

                  Off to the garage tomorrow to pick up a plug or two
                  [center][font=Microsoft Sans Serif][size=7][color=magenta][u][b][img]http://www.gifs.net/animate/hipgrl12.gif[/img][/b][/u][/color][/size] [img]http://www.gifs.net/animate/hipmn1.gif[/img][/font][/center][center][img]http://homepage.ntlworld.com/jim_ashton/shyAV5.jpg[/img][/center][center][b][color=#ff00ff][size=7][u]E[/u][/size][u][size=5]ms [/size][size=5]&[/size][size=7] J[/size][size=5]im[/size][/u][/color][/b][/center]

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                  • #10
                    Originally posted by Ems and Jim
                    This was my theory..... dredged the triangle out of my head and came up with the wrong number (about 10amps)

                    I reckoned that 1, 2 and 3 are pulling near 20 amps each number 4 is struggling with 10.... bingo ! 20+20+20+20 = 80.... what size is the glow plug fuse ? Its a wild guess, but as I have 4 spare glow plugs why not !


                    As for breathing.... no it doesn't but thanks for the suggestion.
                    glad to hear
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                    • #11
                      Originally posted by Ems and Jim
                      Does anyone know what sort of resistance reading (in ohms) I should expect from a glow plug ? I have 4 plugs and 3 are about 0.1ohms (allowing for test leads) and the fourth is 1ohm.

                      It looks to me like number 4 is kn4ckerd.... any thoughts ?
                      No it's the other 3 that are knackered. Less resistance means less heat generated. If they got much better at condicting they'd be a dead short and blow the fuse.

                      Cheers

                      Comment


                      • #12
                        Originally posted by Ems and Jim
                        This was my theory..... dredged the triangle out of my head and came up with the wrong number (about 10amps)

                        I reckoned that 1, 2 and 3 are pulling near 20 amps each number 4 is struggling with 10.... bingo ! 20+20+20+20 = 80.... what size is the glow plug fuse ? Its a wild guess, but as I have 4 spare glow plugs why not !


                        As for breathing.... no it doesn't but thanks for the suggestion.

                        Glow plug fuse 80A so 20+20+20+20 is a bit near the mark for the 80A fuse.
                        Disconnect cable from negative side of battery. Remove the glow plug buzz bar, check there is continuity between the glow plug post and earth, if there is they work, if not replace them.
                        Apparently you need to disonnect the negative and buzz bar on tests as
                        the readings could be false due to feed across the bar & negative.
                        Say not always what you know, but always know what you say.

                        My 4x4
                        My choice
                        Back off

                        Comment


                        • #13
                          Change them all

                          Since you have to remove all of the gubbins to change one or all of the glow plugs - why not change them all?

                          I got the ones from Milners, so at about a fiver each - the difference is £15. It's hardly worth having to strip the system down again in 2 months time when another plug stops working.

                          If you have a new set in - you know you should have a while before you need to pull it apart again.

                          Let's face it - you'd never change just one spark plug in a petrol engine would you? And they're way easier to change.

                          Rob

                          Comment


                          • #14
                            Originally posted by robnw67
                            Since you have to remove all of the gubbins to change one or all of the glow plugs - why not change them all?

                            I got the ones from Milners, so at about a fiver each - the difference is £15. It's hardly worth having to strip the system down again in 2 months time when another plug stops working.

                            If you have a new set in - you know you should have a while before you need to pull it apart again.

                            Let's face it - you'd never change just one spark plug in a petrol engine would you? And they're way easier to change.

                            Rob
                            all right in theory, but glow plugs just go at anytime, a new one isnt really guaranteed to last as long as one thats already in and working, this thread is making them sound to complicated for people with no knowledge of, or dont own any electrical test equipment, a simple test is remove the buzz bar connecting them all together, get a piece of 12v wire hold one end on the positive battery terminal, touch the thin thread on top of the glow plug if theres a spark its working ok, if there isnt its dead and needs replacing
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                            • #15
                              Originally posted by Koi
                              Glow plug fuse 80A so 20+20+20+20 is a bit near the mark for the 80A fuse.
                              Disconnect cable from negative side of battery. Remove the glow plug buzz bar, check there is continuity between the glow plug post and earth, if there is they work, if not replace them.
                              Apparently you need to disonnect the negative and buzz bar on tests as
                              the readings could be false due to feed across the bar & negative.
                              Awwww b*gger it.... it was far toooo late at night to go thinking !!! Lucky's right of course..... low reading..... dodgy plug !

                              However as I didn't take the buzz bar off I'm an $rse!

                              I have all of the plugs from the 'retired' engine (all reading 1.2 ohms when removed) and as its only 15 mins to do I reckon I'll have a fiddle tomorra.... too late 2night, crap week at work so the pub is calling and the babysitter will be here soon (Cheers dad!)

                              Time for beer !!!!!!!!!!!
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