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In this video I take you through the process I use to check fuel injectors on a car that is setting lean codes. After eliminating all possible variables and determining it is a fuel delivery issue we need a way to prove it. Let's have a look. -Enjoy!
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50 thoughts on “Pico scope: measuring fuel injector pressure drop”
  1. Avataaar/Circle Created with python_avatars mike v says:

    How do you monitor fuel rail pressure on a scope? What scope pickup/adapter? Guess could use old pressure gauge and get similar results.

  2. Avataaar/Circle Created with python_avatars Tek24 says:

    Can anybody tell me where he plugged in the pressure transducer to get those readings? I鈥檓 assuming he鈥檚 getting it from the fuel rail? Thanks

  3. Avataaar/Circle Created with python_avatars AutomotiveDiag says:

    Great job

  4. Avataaar/Circle Created with python_avatars robert medina says:

    Awesome video! Thank you!

  5. Avataaar/Circle Created with python_avatars Hicham Said says:

    thank you so much for this tests, is this test available for both diesel and petrol engine ?

  6. Avataaar/Circle Created with python_avatars Kenneth Franklin says:

    I don't understand why you worry about negative comments. I've only seen a small handful in all the hundreds of videos you have. Do you delete the negative ones? And who is Ivan? I keep asking, but no one responds.

  7. Avataaar/Circle Created with python_avatars Hicham Said says:

    this technique is applicable for both types of engine; diesel and petrol. thanks so much

  8. Avataaar/Circle Created with python_avatars Doug Kubash says:

    Great video as always! Fuel pressure is so important – small example – we had a F-700 with a 429ci fuel injected gas engine that had exhaust that smelled so rich it would burn your eyes. It had low fuel pressure ended up being the fuel pump. My theory was the injectors didn't have enough pressure being delivered and were squirting fuel instead of atomizing.

  9. Avataaar/Circle Created with python_avatars Nate Who says:

    what would be the possibility of it being the connector controlling those two failed

  10. Avataaar/Circle Created with python_avatars MacDonalds Motorworks says:

    Hey Eric.. can you offer any info on how you T'd the wps500 into the fuel rail? I'm looking at this same job for a honda and a mazda and need to arrange for connectors…

  11. Avataaar/Circle Created with python_avatars Andy C says:

    Nice work on getting picked up by a picoscope news release. Strange seeing that in the UK marketplace.馃ぃ馃憣馃徑馃憤馃徏馃帠

  12. Avataaar/Circle Created with python_avatars Paul Sommers says:

    So Eric, after replacing all 6 injectors did it fix the problem..?

  13. Avataaar/Circle Created with python_avatars gotj says:

    Lean Ist good

  14. Avataaar/Circle Created with python_avatars Ivan Hernandez says:

    A big F bomb to whoever dislikes Erics videos

  15. Avataaar/Circle Created with python_avatars blockbmw says:

    I watch because you use technology and I want to know how to also. Did you fire the fuel pump with scan tool or short the relay to power it?

  16. Avataaar/Circle Created with python_avatars Marc Harris says:

    This seems way faster than The good ole fashion scan tool with a pressure guage. Using the harness instead of going directly to the injector saves a lot of time. Great diagnoses.

  17. Avataaar/Circle Created with python_avatars Norb says:

    Your a doctor of cars

  18. Avataaar/Circle Created with python_avatars Q Can says:

    Interesting that the 2 injectors that were different were on the other connector/harness ….

  19. Avataaar/Circle Created with python_avatars Alan W says:

    Oh my bad, I should have kept watching. That's fuel pressure on the pico

  20. Avataaar/Circle Created with python_avatars Alan W says:

    What are your settings on the Pico, I'm just wondering how high those injectors spike when de-energized?

  21. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Good diag would of been nice to have known good peco data but sometimes there isn't any yet @SouthMainAutoRepairLLC

  22. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Good video Eric O Great work on this one @SouthMainAutoRepairLLC

  23. Avataaar/Circle Created with python_avatars Jeff Roach says:

    Really nice diagnosis. My engineering experience makes me think the only good injector may be 5, but 2 and 6 are definitely bad since the pulse width is shorter than the other four indicating the injector may not be responding to all the pulses.

  24. Avataaar/Circle Created with python_avatars bill luzius says:

    You should of use the hook on the injectors try that once like to see how it turns out

  25. Avataaar/Circle Created with python_avatars Trip's Hobbies says:

    Whenever I fall asleep with youtube playing this channel always lands up playing eventually and the sound of an impact wrench wakes me up 馃檪

  26. Avataaar/Circle Created with python_avatars gwiz1100 says:

    have watched quite a few of your video's, some of the best i have ever seen if i lived in NY you would be working on my cars

  27. Avataaar/Circle Created with python_avatars Speed Demon says:

    Hi. I got a question. I got a 09 Silverado and I got the p0700 code but it's not throwing another code with it. And my traction control light is on and stabilitrak . And I dont have the gear indicator on dash. And it has a 1 2 hard shift. Just wondering if you had any ideas? Thanks

  28. Avataaar/Circle Created with python_avatars Bobby Anderson says:

    Plz help. I just changed my throttle body with position new position sensor because I was getting reduced engine power. It helped a couple months now its acting up again. Idling low to the point it cuts off. Used my obd reader and got codes p0220 and p2135. I looked them up and both seem to be the same Idk. Can u plz help me.

  29. Avataaar/Circle Created with python_avatars Al Gore says:

    You ever open the astro box from your last w.u.w?

  30. Avataaar/Circle Created with python_avatars sergio says:

    excellent video like always! keep up the good work

  31. Avataaar/Circle Created with python_avatars MrBigtime1986 says:

    You know Gary, the best way to fix this problem is to tell the owner to buy a Toyota. LOL

  32. Avataaar/Circle Created with python_avatars khndenmark says:

    Informative video, but it will be nice to se the fix.

  33. Avataaar/Circle Created with python_avatars Eric Hagler says:

    i cant remember if you can do a fuel injector on off toggle on this car but, what i was getting at could you do a running drop test as well with the same pressure tester

  34. Avataaar/Circle Created with python_avatars Steve Polk says:

    I'm listening

  35. Avataaar/Circle Created with python_avatars Mice InOz says:

    Yep, seeing how you use modern technology to identify faults is the very reason I watch your channel. Keep up the good work.

  36. Avataaar/Circle Created with python_avatars chris richard says:

    1997 f250 5.8l . Ford no longer makes fuel rail kits, mine is shot, can't find aftermarket parts and salvage yard parts are equally bad. Don't want to impose but,聽I figured " what the hell" I'll throw out a Hail Mary. Any ideas?

  37. Avataaar/Circle Created with python_avatars Mike Mardis says:

    What were you using to trigger the fuel pump?

  38. Avataaar/Circle Created with python_avatars Thomas DeMarco says:

    ?

  39. Avataaar/Circle Created with python_avatars Thomas DeMarco says:

    otc and a fuel pressure tester pretty close don't you think

  40. Avataaar/Circle Created with python_avatars Colorado Moe says:

    Absolute genius! I normally pull the injectors and run em through a flow meter. You are going to save me a lot of time!

  41. Avataaar/Circle Created with python_avatars jorge fernandez says:

    You are thorough it makes sense. Thanks for the video.

  42. Avataaar/Circle Created with python_avatars james mccreary says:

    Never under estimate the spark , just experienced this on my 2000 crv lean condition began with new injectors ,fuel pump relay, fuel regulator ,fuel pump and sending unit ….Not …New distributor and rotor as well as new exhaust cat and up and down oxygen sensors….. Not …It WAS Ignition coil and ignition control module causing misfire 219,000 clicks and still purring like a kitten Hondas B20 baby !

  43. Avataaar/Circle Created with python_avatars Brent Owen says:

    Great diagnoses. Glad you're recommending all injectors…was curious as I was watching what recommendation you'd make. Ma'am the fuel injectors are "relatively" messed up.

  44. Avataaar/Circle Created with python_avatars Matt Williams says:

    My chevy express is doing this same thing. Random misfire

  45. Avataaar/Circle Created with python_avatars Robert Nobody says:

    SMA Decal. How do I purchase a couple?
    I鈥檝e tried in the past send the PayPal request without success. Trying to figure out if I got powers and grounds, already checked the fuse in my phone. Need help in troubleshooting this missing decal no start.

  46. Avataaar/Circle Created with python_avatars Phillip Knapp says:

    Do you have a link for the test light you use?
    Thanks

  47. Avataaar/Circle Created with python_avatars Chris Feret says:

    A little above my tool grade…
    But I am a DIYer

  48. Avataaar/Circle Created with python_avatars MIKE CONT says:

    VERY INFORMATIVE. GREAT VIDEO.

  49. Avataaar/Circle Created with python_avatars Oscar Larin says:

    Would looking at rate of decay or how long it takes to drop a certain amount of fuel pressure (i.e 5 PSI) give a more accurate reading on fuel injector performance?