How to Test Glow Plugs - Measure the Resistance (Still Fitted to the Vehicle)

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Test Meter (Multimeter) - (UK) - ebay.us/TYvuAn
Multimeter (Test Meter) - (USA) - ebay.us/5UXl14
Glow Plug Removal Tools - (UK) - ebay.us/XCVgft
Glow Plug Removal Tools - (USA) - ebay.us/FohVav
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Jumper Cables - (USA) - ebay.us/92CL4z
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For more information, see: do-it-up.com/v...
There is a typo at 1:40 where it says 3m ohms, this should be 3M ohms...
Other Videos:
- With a test meter: • How to Test Glow Plugs...
- Without a test meter: • How to Test Glow Plugs...
Testing Glow Plugs Without Removing From Vehicle can be a quick way to check if they’re OK. It doesn’t always produce accurate results though (if there’s poor contact, corrosion, etc). However, testing in place can still be a good indicator on the condition. I.e. Poor results - Remove the glow plugs from the vehicle and check / test again…
The brief description that follows, helps explain why your vehicle doesn’t start easily when cold, and why we need to test the glow plugs…
Petrol engines start with the assistance of a spark from a spark plug to ignite the fuel. Whereas diesel engines start using the compression of the fuel mixture. However, diesels don’t like starting when cold. Hence diesel engines are fitted with glow plugs that heat the air fuel mix to aid starting when cold.
If a diesel engine is running well and starts easily when the engine is warm, but won’t start when cold, (or takes ages to get it started when cold). It could be an issue with the glow plugs, the glow plug system (module, relay, or voltage supply). This video shows how to test glow plugs without a multimeter (test meter).

Опубликовано:

8 сен 2024

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Комментарии : 64

@columbiaindieband4717 9 месяцев назад

Thanks for this, just saved me a trip to the garage. A £13 bill instead of £113 👍👍

@doitup 9 месяцев назад

Hi, glad it helped... It's great when someone lets you know. It makes the time taken making the video all worthwhile... 😃👍

@TonyG-iu4td 8 месяцев назад

Thankyou for taking the time to show exactly what you are testing. Not all similar vids bother 👍

@doitup 8 месяцев назад

Hi, thanks for letting me know. It's great to hear when it helps someone out... 😃

@TonyG-iu4td 8 месяцев назад

@@doitup No worries. So many people add similar vids to help but assume that the audience has their level of knowledge? If they went slow and showed what they were doing, like U! Then we would all understand!

@doitup 8 месяцев назад

Thanks for that. The trouble with knowing something, is you can assume everyone else knows it too... I can certainly fall foul of that sometimes. My brain soaks up knowledge very slowly, so maybe that's my superpower... The ability to pass it back slowly as well..! 🤣

@enlightenednews5265 Год назад

Good video clearly explained

@doitup Год назад

Hi, thanks for letting me know. Makes all the effort worthwhile... 😃

@JatinderSingh-jj5xi 3 месяца назад

Nice video

@doitup 3 месяца назад

Hi, thanks for letting me know it helped you out. Much appreciated... 😀

@albertc5813 4 месяца назад

Great video!! Thank you!!

@doitup 4 месяца назад

Hi, thanks for letting me know it helped you out... 😀

@sergiop2207 Год назад

Thank you! Very nice video!

@doitup Год назад

Hi, glad you liked it Thanks for letting me know... 😃

@norwindaveramirez6089 Год назад

Nc infos, Sir Happy 2023

@doitup Год назад

Hi, thanks for comment. It's much appreciated. HNY to you too... 😃

@juliandodwell8213 Месяц назад

Number one is still good , no?

@doitup Месяц назад

Hi, good spot. It is defective. Unfortunately, there's a typing error in the text. it should say M ohms, (not m ohms!). The meter display shows the correct reading. Once the video is uploaded, I can't change it, unless I delete it and start again. There's a comment in the text below the video correcting the error... 👍

@nuribnuu 7 месяцев назад

Thanks

@doitup 7 месяцев назад

No problem, thanks for letting me know... 😃

@adamclifford1278 Год назад

Thanks!Great!

@doitup Год назад

Hi, thank you. It's always good to know when it helps someone out... 😃

@RamKumar-lh1sv Год назад

Good video🎥 🙂

@doitup Год назад

Hi, thanks for letting me know. It's much appreciated... 😃

@samostar4375 Год назад

Hi... make this test after turning the ignition key at position 2 . or not ?

@doitup Год назад

Hi, yes... Turn the ignition on, so you have voltage applied to the glow plugs, (often called position 2). You don't usually have to have the engine running, as you want the glow plugs to preheat before the engine starts. Hope this helps... 👍😃

@vidgalves 5 месяцев назад

Hello. How do you remove the plastic case? Just pull it up? I’m not being capable of removing it

@doitup 5 месяцев назад

Hi, if you mean the accoustic cover over the top of the engine, they can be push on and off. But they can also be held on with clips and screws. Sometimes they can be made of several parts, (where you have to remove part of the cover to reveal more clips or screws underneath). The best way is to slowly work around the cover, identifying where the most resistance and try and fathom out how it's fixed. If you mean the connections on top of the glow plugs, they may just be pull off. They could also have a release mechanism where you compress part of the connector to release. Unfortunately, each manufacturer may have their own method of release, and this may change depending on the vehicle model and its age? Use Google to see if anyone demonstrates how, when carrying out similar tasks with the same type of vehicle... I've probably not helped you much here, but it may have pointed you in the right direction? I hope you get it fixed soon... 😃

@markjohn4802 Год назад

Hi. Do I need to remove the leads, they're held on with a nut, but deep down. Save aggro if I didn't.

@doitup Год назад

Hi, I would measure the voltage with the lead in place if you can and see what it is. If there are any discrepancies, then you may have to remove the lead to check it. Before you do that though, check what the actual voltage should be for your vehicle. You can look up the data sheets on one of the manufacturers websites to verify if the voltage is correct. If you have to remove the leads, a magnet on one of those telescopic sticks, are extremely handy if you ever drop a nut or bolt, (and sometimes you can magnetise a socket with it). Hope this helps and you get it fixed soon... 😃

@BLahBLahBLahBLah584 Год назад

Hi, when I do the same test with my multimeter, I get a reading of 0 on all 4 glowplugs, does this mean they are faulty? My car doesn't start but not displaying any codes

@doitup Год назад

Hi, there would usually be a very small amount of resistance (typically between 1 and 6 ohms), with a working glow plug. A more detailed description of the resistance and what to expect can be found here: do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/#Typical-Glow-Plug-Resistance-Values. However, if you're measuring the glow plug resistance with them still fitted, you can get errors. So, if you suspect the glow plugs are faulty, you can do an easy practical check. - Remove the glow plug from the vehicle. Plug it into the connector and place it somewhere where it won't burn anything. Earth the end of the glow plug that screws into the engine with a jump lead or similar, (to provide the electrical circuit). Turn on the ignition and see if/how much it glows, (and also very importantly... How long for). I have another video that shows how to do this, if you follow the link: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YkKsbRHHNS8.html. - More detailed information, can also be found here: do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/. Hopefully this will prove the glow plugs and the glow plug circuit, (before replacing anything). Please let us know how you get on, as it may help others? As usual, at your own risk. Hope this helps, and you get it fixed soon... 😃

@BLahBLahBLahBLah584 Год назад

@@doitup thanks for the reply, I can't remove the GPs as they're stuck and don't want to snap them, but managed to get a better reading, all 4 GP are showing 0.07, I don't know if that's good or bad

@doitup Год назад

Hi, It's difficult to say without removing the glow plugs and physically checking if they heat up? Testing in place may only give an indication of their condition. If there is corrosion, (they're stuck) then there may not be a good electrical contact for the glow plug circuit to work effectively, (or to take measurements). 0 ohms would be a dead short. 0.07 is close to that, (1 to 6 ohms is typical, dependent on the type of glow plug). You should also check the glow plug timer, and supply voltages in case the control unit (relay, etc) is defective? I have a video here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-A_IUlFjHcvI.html. I also have a video on removing the glow plugs ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-hTCgpOxTPXA.html. If they're difficult to get out, try removing them when the engines hot. Soak in penetrating fluid (leave it to soak in), but make sure it's not so hot the penetrating fluid catches fire, or gets spilt on a hot exhaust, etc. When replacing glow plugs, they don't need to be tightened much at all (about 7 to 9 Nm, dependant on the type). Use copper ease, a copper based high temperature grease on any threads, to prevent corrosion and prevent them from getting stuck again. As usual, at your own risk. Hope this helps, and you get it fixed soon... 😃

@borjaosaba4412 Год назад

Hello. Thank you very much for your video. One question please: I need to change them. But I can buy 4 glow plugs of 0,5 ohm-s or 1 ohm-s. Which one is better??? 1 ohm??? 0,5 ohm??? These are cheaper, almost half price than the 1 ohm-s. Thank you very much. Have a nice day.

@doitup Год назад

Hi, I wouldn't be able to say if one is better than the other, as there could be other design parameters involved. The best thing to do, is if you know the make of the glow plugs, visit the manufacturer's website. They often have lookup tools, or an online catalogue (sometimes called a webcat) where you can check the requirements for your vehicle. You could also compare with other brand catalogues to see which is the correct fitment for your vehicle. If you get offered a choice of more than one glow plug, you would have to look at the specifications to compare. For instance... It could be your specific engine, the temperature range where you live, (or other parameters) in choosing which is the best one for your vehicle? Unfortunately, sometimes manufactures change engine specifications part the way through a models life, making it more difficult to find the correct part. You can sometimes find the specific engine fitted to your vehicle by looking up the detail using your VIN number online. Try and make sure it's a reputable website. Here's an example google search: www.google.com/search?sxsrf=APwXEdd17lMJdiQzK_z1DHPNGrMYSqzm7w:1680023562740&q=Vehicle+specs+by+VIN+free&sa=X&ved=2ahUKEwjWna-9j__9AhWholwKHXZCCqcQ1QJ6BAg8EAE&biw=1920&bih=929&dpr=1 This should help you make the right choice when ordering parts. Hope this helps... 😃

@borjaosaba4412 Год назад

@@doitup the 2 of them (0,5 and 1) are of the same brand. But I forgot the name of it.

@borjaosaba4412 Год назад

@@doitup thank you for your answer.

@doitup Год назад

Hi, no problem. It can be a pain trying to find the right part, as there are often different parameters to consider. As an example, my wife's mini could have one of two engines fitted. Both are a 1.6 litre engine... - 1598cc 85KW 116HP, N12 B16 A; N16 B16 A or - 1598cc 88KW 120HP, N12 B16 A. A VIN number search eventually told me which one was fitted... I hope you get it sorted soon... 😄

@theandreas9262 Год назад

i got my glow plug fuse blown out and what do usually cause this? shorted glow plug to ground? can I check which one is at faulty without removing it? I have boxer engine so it is not that easy to take them out

@doitup Год назад

Hi, the fuse will blow if the current in the circuit gets too high. This is often caused by a dead short. You should be able to check for this with the glow plugs still fitted. You may want to make sure your test meter reads 0 ohms (by touching the two test leads together) before you start, to make sure you can get an accurate reading, (as glow plugs usually have a low resistance). If there is nothing obvious when fault finding, try and disconnect different parts of the circuit (to split it into different area's), so you can try and isolate the area where the fault is occurring. Note that the glow plug(s) may initially appear to be OK (when tested cold), but could break down under load. Hope this helps... 😃

@theandreas9262 Год назад

@@doitup thanks for your video and your answer !!!

@doitup Год назад

No problem... I hope you get it fixed soon.

@theeaskey Год назад

Is it assumed you disconnect the glow plug harness first ..

@doitup Год назад

Hi, yes... It's best to disconnect the glow plug from the harness before taking any measurements. Please note that you will always get a more accurate reading with the glow plug removed. Measuring the glow plug when still fitted may only give you an indication on the glow plugs condition, (as you can get errors if there is corrosion etc). However, If you do get a good reading with the glow plugs fitted, then you know the glow plug is making a good electrical contact with the engine head/block. If you need more detail, I have some other video's here: - How to test glow plugs with a test meter (from start to finish): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nFrvzstFqwE.html - How to test glow plugs without a test meter (from start to finish): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YkKsbRHHNS8.html Hope this helps (and makes some sense!)... 😃

@guermandmitriev6446 Год назад

Remember glow plugs are different, Delco,Bash can be 10.5v,11.5v,12.0v( heat different),same as resistance( 1.0,1.2,1,3owhz) There is another tip,glow plug relay,must be specify. Parts must be in good quality, business don't follow it... Prepare yourself to see new world with a junk left.

@doitup Год назад

Hi, yes. Great info... The voltages and resistance can vary. Typical resistance 1 to 5 ohms and the voltages from 5 to 12v dependant on the system and manufacturer. Generally the 'older type' of glow plugs would be around 1 ohm... do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/#Typical-Glow-Plug-Resistance-Values... and approx 12v do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/#Checking-the-Glow-Plug-Supply-Voltage-the-Glow-Plug-Relay. It's always best to check the manufacturers specifications on their website though, especially if it's a newer type vehicle! When measuring resistance, it's always worthwhile checking your test meter is reading correctly before you take a measurement... do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/#Check-Your-Test-Meter. Thanks for the info... Anything that's useful to others trying to fix their vehicles is always a great help... 👍😃

@SkepticleOrc 10 месяцев назад

Anything up to 6 ohms is acceptable. Meaning, not all these need replacing. That one with 211 ohms lol. Does it even work? Good video. 😊

@doitup 10 месяцев назад

Hi. Anything up to 6 ohms is acceptable..? Not a straightforward answer I'm afraid. In some cases yes... Newer vehicles may have more fancy glow plugs! If it's a fancy glow plug the resistance may be more specific. Plus they now have other tricks up their sleeve such as pressure sensors included, etc. Dependant on your vehicle... If it has 'fancy pants' glow plugs, it may be useful to look up the data sheet on the glow plug manufacturer's website. Some specify more precise measurements for voltage and resistance, as glow plugs and vehicles get smarter... Nothing's ever easy these days! Thanks for your comment, I hope the not so straightforward answer helps in some way... 😄

@SkepticleOrc 10 месяцев назад

@@doitup No I totally get it, I understand that much. Technology is never simple lol.

@doitup 10 месяцев назад

Technology is wonderful... May it never break down or take over the world, and allow us all to retire on full pay, (index linked)... 👍😁

@richiejbhoy1888 7 месяцев назад

Number 1 is 3ohms, why has that failed?

@doitup 7 месяцев назад

Hi, it could be that it's a newer more fancy glow plug that has tighter tolerances? You may be able to look up the manufacturers data sheet to get the exact values of your specific glow plug. You can also check that your test meter is reading the correct resistance value. There is an explanation of how to check your test meter here: do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/#Check-Your-Test-Meter. There is more info on glow plug resistance here: do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/#Checking-the-Glow-Plug-Resistance. that may help? Hope this helps and you get it fixed soon... 😃

@alexanderthomas412 4 месяца назад

Correction: The 1st plug is 3.03 Million ohms & not milli ohms.

@doitup 4 месяца назад

Hi. Yes, you're quite right. Just a typo I'm afraid... Unfortunately, once the video is uploaded, you can't change the video itself, so you either have to leave it as it is, or start again! I've added a note in the text below the video... 😃

@MoBH88 2 года назад

Thanks, a very useful video

@doitup 2 года назад

Thanks for letting me know. I'm glad it was helpful... 😃

@chemorgan8131 2 года назад

What if they come back as 1 ? Thanks in advance

@doitup 2 года назад

Hi, A typical resistance value for a working glow plug is usually between 1 and 6 ohms. You want a low resistance, so the energy is dissipated in the glow plug and it heats up. But… Not a really, really low resistance (like a dead short). Otherwise, the energy will be dissipated in the glow plug, and in the rest of the circuit. Blowing the fuse and potentially melting the wires (dependant on the fuse rating and how quickly the fuse reacts!). More information can be found here, Typical Resistance Values: do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/#Typical-Glow-Plug-Resistance-Values and here, Glow Plug Resistance Explained: do-it-up.com/vehicles/engine-transmission/diesel-wont-start-when-cold-how-to-fix-glow-plugs/#Glow-Plug-Resistance-Explained. Hope this helps... 😃