Testing Fuel Injectors Fast

How to test fuel injectors for pulsing. Learn how to check fuel injectors. I use a screwdriver to test fuel injectors to make sure they are firing. You place a long screwdriver to the base of each injector and put your ear to the end of the screwdriver (like a doctors stethoscope). You should hear constant clicking. If not, then your injector isn’t firing or is firing intermittently.
Symptoms of bad injectors are a check engine light with codes P0300 through P0308, misfiring, hesitation, poor fuel economy, stalling, and a poor idle.

Using a Multimeter to Check Fuel Injector Resistance: https://www.youtube.com/watch?v=ZVXchvHefNc

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Due to factors beyond the control of ChrisFix, I cannot guarantee against improper use or unauthorized modifications of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ChrisFix recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ChrisFix.

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24 thoughts on “Testing Fuel Injectors Fast

  1. You literally just saved me from just going and buying a new car. All over p0301 and injector 1 not ticking. Thank you from me and my bank account!

  2. So I have a 97 Ford 150, and one day all of sudden, I believe to be the cause of water because of a bad rainstorm, it just started losing all power while I was driving it. It sounded a lot louder, the engine was idling rough and it would backfire and misfire. So I immediately was thinking coil packs and spark plugs. I replaced them all and it still is acting the same way. Sometimes it will stay cranked up and sound fine then the next it shakes and sounds rough. I checked my injectors just like this and it sounded fine. I’m so confused on what is causing it to be this way. I am hearing a weird noise coming from the engine bay that I haven’t heard before but can’t figure out what. I also replaced the fuel filter and used Lucas gas treatment for the gas and oil but it still doing the same thing.

  3. What if it is stuck open? Would you not hear clicking? I will still try this trick today when I get home. See if I notice any difference in noise.

  4. my ford ranger, it smells like gasoline when I turn it on, also, when I accelerate, it sounds like it loses power.

    In an autozone, they tell me you have a fuel overflow.

    any advice on that?

    Its a 2007 Ranger XL – L4 – 2.3L 140ci GAS MFI vin D – 4 valve DOHC

  5. I see a a lot of videos on the code p0304. Most of the videos show the mechanic replacing the ignition coils and spark plugs. I have the same code, misfire 4 cylinder. However, I replaced those about 6 months ago. Just to be sure- did a ignition coil and spark plug swap, after that kicked up the same code and problem while driving. Could the problem be the injector?

  6. This is a great trick i learned a few vehicles back, Harbor Freight sells a cheap ass tool i bought that looks like a doctors stethoscope to do the exact same thing, didn't really need it but great to have if i ever do.

  7. I used an actual mechanic stethoscope and with the injector unplugged, I can still hear the ticking. Which means I'm hearing the other injectors through the rail.

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