Fuel Injector Testing: Noid Light vs Power Probe vs Test Light (Honda)
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- čas přidán 5. 07. 2024
- In this video I show you how I test the circuitry on an older Honda fuel injector using a noid light, a test light and a Power Probe. The vehicle shown in the video is a 2000 Honda Civic LX. These are not the only ways to test a fuel injector system.
Please note: This is a conventional multi port fuel injector system that I am testing. It is NOT one of the newer Gasoline Direct Injection (GDI) systems that use much higher pressures and have the fuel injector inside the cylinder. Do not unplug a fuel injector on a system you are not familiar with, you can do severe engine damage.
Misfires and fuel systems can be tricky to diagnose. If you are unsure about anything you might want to have a trusted mechanic diagnose it for you.
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This channel earns a small commission using some of these links - at no additional cost to you.
PowerProbe IV: amzn.to/2zQqcFL
OTC Noid Light Set: amzn.to/2NOWRDI
OTC 3636 Test Light: amzn.to/2zPEnei
OTC Leak Down Tester: amzn.to/2NMtIcf
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My miss fire just started and is sporadic. P0204 jeep liberty. At times I turn on the vehicle it acts normal and other times on start is misfires cylinder 4. I swapped the coils and spark plugs to see if it would follow and it doesn't. Now I believe it comes down to the injector acting sporadic or from the the electrical plug. Any thoughts?
V.
I watched so many videos just to get this one answer.. Thank you..
The kind of explanation I never saw in the period of 25 years, it's awesome .The tools and way you trouble shooting fantastic and perfect.
I appreciate the comment, thanks!
My Jeep is a "crank, no start" and I needed a refresher on how to use a Noid light. I learned more than I was looking for by watching this video. Thanks Dave.
Thanks for the bonus footage! I thought you were gonna leave us hanging. It would've been like watching a movie and not showing us the ending.
Damn!
You just doubled my knowledge on computer controlled injection system!
I have a 93 accord! Yours looks almost exactly like mine!
Great video!
👍
I've looked at a lot of videos about misfire diagnosis and using the Power Probe and this is by far the best that I've seen. Clear, simple instructions. You've taken out some of the mystery and confusion that others gave.
I appreciate the comment, thank you!
Excellent Video, your ability to make things easy to understand for an amateur mechanic is unmatched. Please keep them coming!!
Thank you, I appreciate the comment!
Absolutely loved the bonus footage showing the leak down test. I was wondering what the problem was up until that point. Thanks for taking the time and trouble of making this excellent, nay, Superior video, and sharing your skill and knowledge with us! Thanks again, David
I appreciate the comment, thank you!
I'm not sure why it took me so long to find your channel, you earned a sub today for sure. We have many similarities, not least of which is our addiction to quality automotive tools. What I really like about your channel is the way you explain how these systems work first, which gives a reliable compass to look for solutions. It was fun to see you use PP4 for the fuel injector. Eric O sent me one of those but I've never used the fuel injector feature. Once I see the test light flashing, I tend to follow the ScannerDanner blueprint of looking at current waveforms. There are lots of right ways to get to the answer.
Found this video while searching for noid lights. Thanks for this very clear explanation! Subscribed right away to your channel.
Thanks for the comment and welcome!
Your videos are really very informative. Lots of info and professionally explained. Like the way you stay on topic and explain what is going on. Excellent
Thank you!
The bonus made the difference between this video and the others. Excellent job .
Enjoyed the video. Really glad you showed the bonus showing the problem. Thank you for doing the video.
Thank you for the comment, I really appreciate it!
Great video, really most helpful one out there on injectors. Thanks!
Thanks!
Really liked the video and explanations being simple and easy to understand. Thank you.
Thank you, I appreciate the comment!
@@BigDog50001 will not the reverse voltage spike flows back to the power feed side and cause short circuit?? Analogy to a diode in a relay, is similar diode or capacitor necessary to absorb the reverse spike and protect the circuit and the solenoid itself?? Please kindly elaborate a bit more.
Thank you for giving us the final diagnosis - not having it would have been a "tough itch to scratch."
Where have this guy been all my life great stuff! Just subbed
lol, thank you for the comment and welcome!
Thank you for taking the time to educate! I really appreciate it!!
Great video and information. You got me towards the end. I was thinking dude what do you check next if the darn injector is getting power and fuel. Then right before I was about to type you the ?, you jumped in with the bonus video of checking the compression and leak down. After that I was saying out loud in my garage to the point my neighbor looked over as I was yelling this guy is awesome and very knowledgeable and lest us lay people know each step to achieve results. I am working on a 2012 dodge caravan with the 3.6 pentastar engine but it looks like your steps will work. I replaced a ton of stuff that requires relearn but I can’t get the van to barely run. I don’t think bank 2 cylinders are firing. I am going to start at your step 1. Thank you Sir for helping out us little people who can’t afford to send the vehicle to a shop.
Thank you, I appreciate the comment!
stumbled across this. you sir are THE MAN!. I have been fighting a no start on a Harley for weeks. It started off with a broken wire going to the throttle body then turned into a mess.
I appreciate the comment, thank you!
What was the problem ?
Excellent explanation of how a fuel injector fires; I did not know that. Thank you.
Super explanation 👌. Thanks for the time to put it together and sharing.
You bet 👍!
Dear sir,ive just come across this video.
A most exellent video.very clear and precise and methodical.
Keep up the great videos.steve from the uk.
Thanks 👍!
This is one of the best vid it explains very well n easy to understand wht need to be done if you myb only hv test light or noid light thnks for the video u gained a follower n a subscriber
Thanks and welcome!
Excellent presentation.
Excellent!! Great work, very helpful, to the point!, keep it up the good work!!
Thanks for the excellent demonstration. This was very good.
Rob's Wrenches Thank you!
Thank you so much. Best video out there on the topic!
Excellent display and knowledge of work!
Best video on injectors!
Thanks!
I infact did enjoy the bonus footage
Awesome, thanks 👍!
Excellent troubleshooting
Thanks 👍!
Excellent video, thanks for sharing. Cheers
Thank you for the comment!
Nice and easy, good demo.
Excellent and thorough
Thanks for the comment 👍!
You've got yourself a new subscriber my friend 🎉
Welcome!
Calling someone out within the first second of a video; now thats a bold move... I LIKE IT! :)
lol
Great tutorial video, from beginning to the end............... Thanks!
Thank you, I'm faimilar with diesels but petrols are a completely different headache. I enjoy the knowledge for troubleshooting :)
Thanks for the comment!
Very nice video. Thank you very much. I wish there was a scope out there that wasn't so expensive that would show the fuel injector opening.
Thank you for the comment. Here is a scope I have that is not too much money: goo.gl/FU9AAA
Keep them coming mate the info is good .
I appreciate the comment, thanks!
Nice work! Of course the owner is sick to hear the news! Thanks for the video!
👍
Another EXCELLENT instruction video - YES , I did GREATLY ENJOY . You are indeed and EXCELLENT Technician. Many thanks for sharing 😊👍👍👍✌️✌️✌️
Thank you, I appreciate the comment!
Love that Bonus footage. that told the tail.
Thank you for the comment!
really great diagnosing!
Thanks 👍!
Good bonus with scope
Great video. Keep it up
Subscribed. Great video thanks. Hello from Australia
Really excellent, clear and very usefull. Well done sir.
Thank you very much! Easy and clear explanation. I Like it in this way.
Thanks for the comment!
A Great job, very informative. Off to price up some kit. Thank you.
Thanks!
Clear and concise , well explained.
Thanks!
Thank you sir, very well done, very informative .
I appreciate the comment, thanks!
Thanks, helped a lot !!
This is quality content. Keep it up.
Thanks 👍!
Love my power probe 4 is a great tool
This was a great video. I need to get a power probe...just haven't pulled the trigger on it yet.
Thanks! It is a nice tool to have, I definitely use mine a lot.
Amazing tutorial!
Thanks 👍!
Great, clear video. Thank You
I appreciate the comment, thanks!
Great video ✌️✌️
This must be as good an instructional video for any automotive troubleshooting as I have ever seen. Great job,
Big Dog50001 Automotive
I appreciate the comment, thank you!
Very helpful video. Wanna more!
lol thanks!
good comparison! and nice tools!
The Disgruntled Mechanic Thanks Mike!
I just love this site brilliant.
THANKS..
👍
Im a stingy sob. U direct to point and thorough.
VERY GOOD EXPLANATIONS.
Thanks!
Very good video and explanation.
Thanks!
Great video, thank you. My 1994 Dodge Dakota 5.2 is driving and running, but throwing an intermittent code for the injector output signal circuit. Even when running fine, I get power (test light bright on all injectors power side), but no ground (no pulsating light to ground side on any injector). Do you know what may cause this... And how is the truck running with no ground to the injectors??
Thank you for the video. Good job.
Thanks!
Super indicative video, keep it up bro,,
👍
Well done!!
Thanks!
just got a power probe 4 love it
I like mine, I think they are a good little tool to have in the tool box. Thanks for the input!
Good video
I have watched some of your vids too, great content! Thanks for the comment!
nice video, refreshed my memory. good will always over come the bad. thats for the people that gave a thumbs down.
I appreciate the comment, thank you!
Very good thank you.
I just subscribed your channel. Thanks for sharing your video. I just have a question for the power probe. Where do you connect the power probe to test the injector? Is it in the connector or to the injector directly? And also the NOID will it work to mercedes benz injectors connector
Excellent
Thanks!
Great video!!!! was the intake valve lash tight holding the valve open? or was it burnt?
Both, thanks!
Thank you for Brilliant video, one question please, can I carry out same test using power probe 4 for testing Diesel injector?
Great video, really appreciate all the explanation. Probably a dumb question: how do you hook up the tester probe? Looks like you jammed the probe down into the connector ground from the back while it’s plugged into the injector? (I guess that’s why they call it back probe?)
Yes I probed it from the back where the wire is crimped to the connector. The probes I use are sharp like a needle which makes it easier to back probe. Thanks for the comment!
Great video So if i back probe plugged in injector with my power probe 4 and i get data like rest of cylinders does that mean injector is good ? Or just circuit system to injector is good
Thankyou. Do more on test light
👍
Great video
Thanks!
Good info!! Thanks
Thanks for the comment!
This is a really good video! Thanks Big Dog.
Thanks for the comment!
The best video
Thanks!
Thank you ❤
I use a scope often but I didn't know about the pintle hump on the waveform; thanks.
Thank you for the comment!
Time to upgrade, thanks
Nice !
Hi there this is a good diagnoatic video. One question when you used the power probe to check the connection i beilive you said you back probed the ground right? If so how could you tell there was good voltage at the same time by only probing the ground? Thanks
Voltage does not drop until there is current flow (Ohm's Law). You will see 12V because it coming in on the other wire and is going through the coil winding inside the fuel injector and stays that way until it is turned on (creates current flow). You will not see 12V if the coil inside the injector is broken. Thanks for the comment!
Do you have to select power or ground on the probe, or it defaults to ground when you select the injector function?
Thank you for the video. I am trying to diagnose a Misfire cylinder 1 P301 hyundai v6. I am at the fuel diagnosis stage. My suspicion is not ignition (spark) based on maintenance and tests of ignition. Timing seems not an issue as cylinder specific on this DOHC timing would cause entire bank issues (misfires P300). Assuming that not seeing the pintile spray pattern through these tests is an issue however your stating that the Power probe 4 showing more data compared to a known good injector shows simpler pulse pattern thus not injector issue.
That was nice, thanks
Thank you for the comment.
Great video....What happens if we have 12 volt constants but we don't have the pulses from ECM....we already check integrity of cable from injector conector to ECM end.....the diagnostic gave to be ECM replace it or can I do something else?
I can't see what you have done as far as testing and I don't know what model or vehicle you are working on, but what you are describing is the transistor/driver for the injector inside the PCM not working. Some vehicles/models will intentionally shut down an injector when it detects an issue so clearing the code, cycling the key and then immediately testing with a test light/noid light would be my next step (but even that is not fool proof as certain vehicles can detect the incorrect current flow/resistance of a test light).
If the PCM is intentionally shutting it down then the test light will flash briefly and then the PCM will most likely shut it off again very quickly. Also be aware that if the driver in the PCM was damaged, I would try and locate the reason the driver went bad before installing a new PCM (bad wiring/shorted injector etc). Thank you for the comment!
I have a issue on injector number 4 on the 1996 Toyota corolla pulsing light but then it goes solid signal I have put a ecu which is been repaired but now with that issue it causing to much fuel coming out in cylinder number 4 causing it to flood in fuel and getting white smoke with strong fuel smell not sure if it's the ecu become faulty again less than 16 days of replacement when the pulsing issue started I change spark plugs wires relays fuse and spark plus distributor n only get a p0304 cause but the irregular pulsing to just the light injector test staying on any ideas what it could cause for I injector 4 to stay on constant. Sorry for my explanation with my grammar.
Thank You.
You bet!
Top gun mechanic
Thanks!
That was a GREAT explanation, thank you!!! I'm doing the same thing on my 2009 Escape with the 2.5L. Cylinder 1 is misfiring. Injector, coil, and plug are all good. Compression is good but I'm going to do a leak down test anyway. Have you ever had any experience with good compression but a failed keak down? Thank you again!!!
Thanks for the comment 👍!
I bought one like this but there is no injector mode but how can i test continuety if the harness of ecu inside the car and the injector outside and ive tried noid tester no pulse and i have no start issue want to check continuety so can you help with this power probe ,how can i do the test?