Using a Multimeter to Test Fuel Injector Using Resistance (Ohms)

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Quick and easy way to test an injector. Please note this is not 100% so further testing may be needed.

[@mechanic7417]

'98 Ford Ranger 3.0 range is 12.0 - 16.0 ohms. Four were about 14.2 ohms. Two were as high as 28 ohms. Truck has over 422,000 miles. I replaced all of them. I have all the paperwork from the previous owner and they were never replaced. And it cleared the P0304 code.

[@coycarlson4979]

Ok - good / simple test and advice. That being said , if I were to perform this test on all injectors as a comparison on ohm readings between the injectors - I would not remove the injectors - rather just unplug them and test without removing

[@jw200]

I planned to clean injector as i have been suggested to do that, and after i clean them i will measure the resistance. Thanks for the tip.

[@paulperez509]

I once again you don't have to respond I read some of the Articles here and found what I was looking for thanks I really appreciate it.

[@SGray-no9zv]

Love that Trans Am in the back!!!!

[@kismofer1]

thanks for that review 👍🏻

[@spelunkerd]

I really like the quality of your audio. Of course the voice is great. But from a technical perspective, what are you using for audio?

[@TheAzore64]

Useful information, many thanks.

[@corycoaxen3491]

Great video and explanation. Thank you

[@darwinbisqueraofficial1426]

Hi, how do you record your audio and video? coz your audio is so clear i'm using ear phones and your like speaking inside my head. Thanks.

[@user-sg7zg5oc7e]

Hi. Very good video. Could you tell me, does the same apply to an adblue injector? Thanks. Toby

[@marcobani9570]

Bravo procedura giusta!

[@saadalghamdi3203]

Thanks . I whel test in my w140

[@keithflaro9257]

Hey johnny i know this question is kinda unrealated to this video but i thaught id ask it any way im rebuilding the top end on an outlaw 90 and dropped a circlip into the bottom end what can i do to get it out?

[@RC-Heli835]

Thanks for sharing man! I just found an injector on my 2000 Windstar van that makes no difference in the sound of the mildly skipping engine when I unplug it. When I unplug any of the other 5 the RMPS drop a couple 100. Now to find out whats wrong with it.-_-

[@Johnnysshop]

ILTSYC Good luck and thanks for watching!

[@Appregator]

Info: Alt 234 will give you the Ω symbol if you use the Numlock Keys to choose the numbers with Numlock On.

[@mudshark1971]

Can I do this while they’re in the engine still, and can I check the wires going to the fuel injectors?

[@makantahi3731]

i measured on two of them and both have 12.0 ohms but one does not work instaled in car and changed position and same thing and all were tested and cleaned and they said it is ok

[@paulperez509]

can you test the fuel injectors while they're still in the same way

[@Pablo-ih9up]

Very helpful thanks

[@bosspranks8349]

I'm not getting any readings on my meter is possible all injectors that bad?

[@mounir2312]

Good job!! Is the 16.3 for all cars injectors? what is the Chevy measure?

[@Johnnysshop]

Thanks! No, they are all a little different. I'm not 100% sure on a Chevy, I usually call the dealer or get the repair manual to find out.

[@SileDevil]

hi how to adjust idle without an inductive tacho

[@kamahoo451]

Thanks! My Millenia is giving me the blues trying to track down the issue of raw fuel inthe exaust & cylinders. Any suggestions would be greatly appreciated. (Engine has under 50k miles)

[@Johnnysshop]

Hmm... Injectors could be sticking.

[@hp11208]

Interesting

[@DoctorHooloovoo]

What is your recording setup? It's good.

[@Johnnysshop]

Thanks, I appreciate it. I'm using a Canon Vixia HFS20 with a Canon DM100 mic.

[@talaueconstante830]

Testing resistance sometimes will lead you to wrong diagnosis..it is better to swap with another..because sometimes injector will malfunction when it gets hot or running..i have experienced it many time..resistance is in specification but after a few minutes of driving, problem will comes..i checked the data stream while engine is running , i saw that the injector #4 is 0 ms..then when engine is cold the injector have 160 ms.

[@random-cq3uk]

hi, all my 4 injectorshave 0 ohms of resistance, but the engine start and no engine light? I did it multiple times, precociously touch only the probes of the injector!! Is it possible or i messed up my resistance test? Thanks! I heard that solenoid injector can have .3ohms of resistance and working fine!

[@kurtjohn5554]

Thx, I just heard about this test I have had a number of issues trying to diagnosis a missing w/ my 1995 Roadmaster. I recently discovered and replaced both catalytic converter's bcoz of being plugged, which I think may have harmed the EFI's. I used my cheap voltmeter w/ setting on 2000 Ohms and I got .015-.017 on 5 of the EFI's and 3 had readings of .005-.007 so I think there maybe a problem w/ those 3 which are on the side of the cat that was mainly plugged. Also my mechanic said that side was running lean. Any advice in appreciated. Thx

[@Johnnysshop]

Hmm. Not 100% sure but I would try to find some used ones online and go from there.

[@kurtjohn5554]

Thx for getting back I was thinking about changing the 3 myself but I watched a fellow on Utube remove the fuel rail at a junk yard and it looks like he used a special expander tool. My mechanic agreed to replace the 3, I hope this will be the last of the issue. I bought new cheaper ones on rockauto bcoz a refurbished one before didnt work.

[@gurunathanc3516]

Very important us

[@scottyfixer452]

What about if I test my injector it test fine within spec and then I waited a few minutes tested it again and it showed open loop 0L on my multimeter I made sure my connections were good

[@Roakusfm]

Thanks for your video and its possible to test without taken it out from the engine?

[@Johnnysshop]

+Roakusfm Sure, just unplug it and test away!

[@Roakusfm]

ok thanks

[@briangutierrez5635]

I test injectors on a motorcycle today in wondering on mine is shows 12.8 - 12.9 ohms but one of the injectors shows at 13.5 ohms is that mean that when is going bad that's open

[@Johnnysshop]

Maybe or maybe not. I would see if you can find out what range is acceptable for those injectors. It may be fine.

[@zernestro]

"331SVTCobra saidFirst reading was 16.1 ohms. The second reading was 15.9. The difference isn't worth worrying about, but notice that you steadied both probes with your fingers, creating a parallel path, and reducing the resistance." ...that's not true. The parallel path goes across your skin, which is a high resistance, some mega ohms. You can't lower the 16ohms with such a high resistance. Meaning: measuring such low resistances, you can't influence the reading by holding probes with fingers. You can check that by the simple parallel res. equation. The story is different when you measure high resistances, but still, the path through skin is very high res. So you need to measure megaohms to screw the reading by touching the probes.

[@mylgardose]

zernestro ,

[@oneguysopinionyup7252]

What are mega ohms

[@kuntz144]

Hey what if your testing your fuel injector for ohms and the multimeter just beeps like when you touch the ends together? Help please

[@AnythingEverythingGh]

Quick one Can cleaning the injectors alter the readings in anyway? Can ohm test it be good, but still the injector bad?

[@EdwardOskarsson]

Cleaning has no effect on ohm test. Ohm test really just checks that the coil inside the injector is still making a circuit. The coil inside magnetically moves the plunger in the injector to allow petrol to pass. It doesn't tell you anything about wether you have a dirty injector, bad seals, corroded connections, or problems in the harness somwhere.

[@bcbjbggjh9102]

@@EdwardOskarsson thks man , that's what i was looking for.. 3 of mine injector were the same while one is off by 1 ohm.

[@codyrockwood15]

Mine does a long beep and 0L before it settles

[@dannychuqui4797]

Hi, thanks for the video s... Question.... So when the injector are bad.....don't shows up any number??? And what's the good number & bad number .....Thank... u very much....for helping us.

[@Johnnysshop]

+Danny Chuqui It really depends on the manufacture. Some will have different readings than others. As far as being bad, it could be a low number, no number at all or really high.

[@ricotampus9201]

sir my injector i check alredy multimeter 13.6 omh.it is good or bad?

[@dieselscience]

*Omega

[@YAMAHA_FAN_BOi_95]

Sir is more resistance means rich mixture ? And bad millage ? My Hyundai santro 2004 are giving me 16 ohms resistance what does that means ? Edit And I Don't know what company manual said about their resistance

[@g0fvt]

Not a problem, nothing to do with economy, the resistance of all the injectors in the set should be pretty consistent.16 ohms is normal for the Sentra.

[@505fastlife6]

This test just tells you which injector is bad how do i know if its clogged?

[@elulitosos3648]

What about if all my injectors are 17 but one go to 22 ?

[@shageershah8231]

Bhai zmr baik ghatke. Maar rahi ha kya hua hoga

[@patrickdubuc3439]

Can doing this test show that it's leaking or your just testing if it is good?

[@wildthoughts6959]

Thank you, that's the purpose we are here looking for vidoes that address faulty injectors. This man demonstrating a healthy injector. I can buy a new one and test it too. F(*(S*DF

[@hasanbokra]

What should be resistance of injectors?

[@clintbalzan8926]

HS HASNY ideally you should test all of them. They should be the same reading. If one is of a different reading, its faulty.

[@EdwinHenryBlachford]

continuity is a good test for a melted coil wire.. cool. Note: if your mechanic says more than one injector has failed, that would be a MIGHTY big coincidence so go out into your garage at midnight and check for aliens in flying saucers firing ray guns at your engine. Or find another mechanic

[@muhammedabbas242]

Edwin Henry Blachford Well, if the fuel system is so dirty or the fuel itself is contaminated with water .... its so likely to find out that more than one injector has failed.

[@NimsChannel]

Edwin Henry Blachford I once honked at a lady for going slow (I never use my horn). Instant karma, she looks up and a dog had appeared - she did an emergency stop and made me barely tap her bumper. She says it was the dog and not to worry - so we leave. My mom calls fifteen minutes and 4 miles down the road. I say you'd never believe what just..... Right at that second a suv came speeding up behind me at a light, took out my vehicle.

[@edgargelabert6056]

Edwin Henry Blachford I'm

[@asdareda5548]

cara mengecek sensor

[@grzegorz16100]

Where do I get specs from? Can't find any. I'm using autodata online but it doesn't give any specs for resistance...

[@Johnnysshop]

Gregory May Might be able to call the dealership, what are you looking for?

[@mayyxx7856]

h. v

[@HwCraze2]

Hi, I was de-subbe somehow and I can't find the other channel to sub again could you send me a link or something?

[@keithflaro9257]

Are you from canada or usa?

[@sulakakooza8139]

Uganda

[@sulakakooza8139]

Uganda

[@sulakakooza8139]

Wiring mechanic but in need of diagnostic computer

[@sulakakooza8139]

Uganda Africa and one of east African countries

[@Anonymous-tm1jn]

I've tested all 4 of mine and they all said 2.5 ohms but when I did the AA battery test only 2 would click, do you have any idea what could be wrong with them?

[@Johnnysshop]

Have you cleaned them?

[@Anonymous-tm1jn]

Johnnysshop, yea I sprayed carb cleaner in them and I had them sitting in it also, I called a local part pull yard and they have injectors for $11 a piece

[@Anonymous-tm1jn]

so I'm just gonna do that route

[@Johnnysshop]

Yeah, I don't blame ya. Can't go wrong at that price!

[@alfredoacosta8510]

U need to clean them

[@2koolforyou88]

I did this same thing with my 99 Camry all read 14.0 ohms and 1 doesn't read at all so I'm thinking this 1 injector is bad

[@jacobingram8152]

2koolforyou88 Did you clean them before testing them? Because they really should be around 16 ohms. 16.5 ohms

[@vikskywalker]

Ok, lets say 16 ohms its the regular spec, what if one injector its 10 ohms? What does that mean? Gonna give more flow or less?

[@my89mustang661]

vikskywalker watch this kzbin.info/www/bejne/iHiYlnaKaJJ4fpY&feature=share

[@H0NDACBR600RR]

Maltymeter yeast

[@joseortez4110]

What if the resistance is 0.0 ohms ?

[@vikskywalker]

Its broken

[@olenaerhardt7725]

Might be bcs of wrong range.

[@ScantPear]

Cant we just put it on continuity

[@Tucson20]

Alligator clips

[@SLICEDfinds]

You will know if an injector is bad if the reading of one injector is out of the 15% range of the average of all your injectors' readings

[@Johnnysshop]

Good tip!

[@danb.3397]

So what's the point then ?

[@brianfrench9487]

He likes saying probe

[@WhatIsKenDoing]

4 minutes of talking for a 4 second description. Just say what you need to say and be done.

[@nicolasom1372]

ok ok my motorcycle injector displays 1 ... he's dead I think or not?

[@Johnnysshop]

Depends. What does the manufacture state the reading range should be?

[@nicolasom1372]

@@Johnnysshop I do not know but there is really no reaction of the multimeter yet the current arrives at the connection!

[@331SVTCobra]

First reading was 16.1 ohms. The second reading was 15.9. The difference isn't worth worrying about, but notice that you steadied both probes with your fingers, creating a parallel path, and reducing the resistance. Oh, and your fingerprints are visible. I'm going to copy them and leave them all around a bank that was just robbed! Buawahahahahhaahha! j/k ;)

[@evlmpyr]

Just get to it. You wasted 2 minutes blabbing

[@tonytrout3784]

awful video. cut the chat get on with it. And there is no pos and neg on the injector

[@mikel2283]

blahblahblahblahblah for 4 minutes. with 15 secs of "touch probes to pins and should be around 15-16 ohms"

[@luismereciano8374]

SWEDISH PLEASE !!!

[@wildthoughts6959]

I hate videos that test GOOD equipment. We are here to learn about faulty equipment, if we don't have problems, we'd watching a movie. Silly , really.