*Tools* 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 The Big Dog 50001 Automotive Channel Store can be found here: www.amazon.com/shop/bigdog50001automotive
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?
The math says no because a 700 mA fuel injector has about 18 ohms of resistance and the 200 mA test light has about 63 ohms. This is with a fully charged battery at 12.6V, key turned to "on" position, and car not running. In order to try and open the injector by grounding it with the test light, you have to put the injector and test light in series with each other and that will drop the current down to about 157 mA. The injector shouldn't open with 157 mA. Especially if it's installed and the fuel rail is pressurized. Reality says different because I have opened my 700 mA injectors with my 220 mA test light.
Sir,Thanks for this video.. I want to calculate fuel consume at the time of fuel injection. I am layman in automobile .... Please ,can you help me for the same. Thanks in Advance
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.
Be sure to subscribe for more tool and car repair videos! ru-vid.com twitter.com/BigDog50001 instagram.com/bigdog50001/ Disclosure: This channel earns a small commission using some of these links - at no additional cost to you. The Big Dog 50001 Automotive Channel Store can be found here: www.amazon.com/shop/bigdog50001automotive
@@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.
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!
Man, i have the previous generation power probe, it doesnt have near those features. When you said power probe I was like how the heck do you use a power probe for this haha
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??
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.
Okay.. Just confused by what you said at the end.. Plugged in it was running rich from the injector dumping fuel, unplugged it evened out, so that means the injector is working properly? I don't understand. Would that not indicate that the injector is leaking? Not that it is in good condition?...
Don't get too hung up on that one test, it is just a quick and dirty way to see if injector is spraying fuel . If the fuel trims change when it is connected/disconnected then it at least gives an indication that something is happening (in this case spraying fuel when connected and not spraying fuel when disconnected). We knew it was a dead misfire, happening all the time, so this was another way to give some direction (should we go left or should we go right) and it helped me steer away from fuel injector and look somewhere else.
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.
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.
I own a 1999 Eurovan with the VR6 engine. Fuel injectors are hidden under the intake manifold, thus impossible to test with the NOID testers. I can only access the injectors harness at its junction with the ECU harness. In the video, I can't see clearly how the PowerProbe IV is connected to the injector. Can I connect the PowerProbe IV to the injector's grounding wire, but at the harness junction? Hope somebody will read and answer my question.
بعد شـُـكر الله ' شــــــكــــــراً لك ؛ وأصل شُغلك المـُمتآز Keeeep UUUPPP Keeeep Goooooing . أُكرّر شُكري لك . Very Very Excellent steps in diagnosing the . problem / malfunction مـُـهـندّس صيآنّة طآئرآت مدنيــّـة ومـُفتش مُرآقبّة الجودّة . ARAB Engineer and Sr. Lead QC Inspector . FAA, IA Inspector NDT/NDI LEVEL II Inspector , Jeddah- Dahran, . Al-Hijaz
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 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.
I have kyzee power probe,. Can i use this on ac voltage or dc voltage? I have frequency on the tool? Any reply appreciated cheers from Australia subbed and liked 👍 ❤
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?
Please answer me, I am testing injector nozzles on 1Rz engine, but when I disconnect the connector on the nozzle and ground my test lamp, then key on and probe the socket with a test lamp but both cables have power at the same time. Is this ok or not? If it's not ok what can I do, because I have a code P0200 (Injector circuit what can I do?
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.
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
It's unfortunate that those honda fuel injectors never goes bad 9/10. So the next time someone looking for a misfire on these 90s honda, you can look at the injectors as the last resort. With these engine conduct a leak down test first for your misfire diagnosis.
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!
hello Bigdog50001 i had heard that test light damage the computer (ECU) that it should be use led instead, what do you thing? greeting from monterrey mexico.
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
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
if i try to test the control signal on a "crank no start car"... would the signal the fire even if the car wont start or does the engine it have to run itself.
Awesome explanation on the white board to start. Best I’ve seen. Acts 3:19-21 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord. 20 And he shall send Jesus Christ, which before was preached unto you: 21 Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
Dont know if u r gonna read this but i may hav fried my pcm. I now hav no ground @ injectors & some other sensors..but car still runs ok.. accidently jumped a relay wrongly. Now hav a bunch of codes maf purge canstr est trans dfi (crank)..
That is definitely not good. I would probably at least check all fuses to see if any were blown, you may have been saved by a fuse. If the cars still runs that is a good sign.
I have the powerprobe maestro, so it wont tell me if my injector is bad just that the circuit feeding it is good? If so how can i test my actual injector on something like an intermittent miss?
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
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
Different vehicles/models can use all kinds of wiring colors for components. For this Civic, the ground for the fuel injectors is what is being controlled by the ECM and they fire at different times so different colors were used. Many manufacturers will use different colors for control but that may not always be the case. The power is shared by all injectors (coming directly from PGM-FI Main Relay), and in this case they are all the same color (YEL/BLK), most likely done because it is easier to manufacture that way.
@@BigDog50001 yeah sucks if they would have brought it in when the engine started to tick would have been a 1 hr labor and new valve cover gasket to make a easy fix. But sometimes people don't understand.. but thanks for the reply back
