Multi Cylinder Mis Fire Fun
ฝัง
- เผยแพร่เมื่อ 30 เม.ย. 2024
- 2017 Nissan Armada with a P0300 Multi Cylinder Mis- Fire
Using a Picoscope and various pressure transducers to get to the bottom of it.
Bonus In-cylinder testing at the end.
Autonerdz for Pico scope equipment and/or pico group membership inquiries.
autonerdz.com/?wpam_id=2 - ยานยนต์และพาหนะ
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Thank you for using pico 7. The more I see it the more I get used to it!
No problem. I'm still getting used to it myself. Gotta keep practicing.
Love learning, thanks for bringing me along through you diags!
No problem. Thanks for riding along! 👍
Excellent diagnostic video like always Carter! Very well explained! Many years ago I was trying to diagnose a 2011 QX56 code P062B and I had a misfire not related to the injectors circuit and I put the pulse sensor in the Intake, and I was more confused than before. Crazy waveform and I am pretty sure is for the VVEL system. Thank you for sharing your knowledge.
When I do intake pulls I like to start with throttle closed and cranking, that seems to produce the simplest wave forms to try and spot issues.I may have to resort to other methods but thats a good starting point.
I still revert back to pico6 when I need a quick capture. Pico 7 runs slow on all of my laptops, I have trouble finding the functions I need quickly and have frequent crashes.
I use both. I'm glad they play nice on the same PC. My P7 skills are still under construction 😆😂
I thought it was only me who had the issue with the phase ruler. I prefer the p6 version. Nice video as always Mr C
I prefer 6 also for pressure stuff. I think just allowing the user to turn on or off the shading would be great.
@Carter : Anyway you could do some mode 6 videos. I like to learn how to use the function and be able to apply it to my diagnostics.
I'm no expert with mode 6 , but the next case study that I mention mode6 data I will try expand on it some. Thanks for watching!
Great captures! Always happy to watch your stuff! I think it's ridiculous that the warranty people can't understand that these waveforms and test are more than enough proof. I captured a rod bearing noise on a clearly knocking and bad engine. They forced me to remove the pan and rod caps,sure enough i was correct. They still force me to disable the car completely so now it can't move under its own power! Why does that make sense to them???
Yeah there was talk of actual pan removal on this. I'm hoping the boroscope pics will save us. It also creates alot more down time for the customer and then the age old question of who pays for the rental usually not the warranty company.
27:29 click the views tab to toggle channels on/off !
Nice. Thank you for that.
So much valuable information in your videos. Thank you for taking the time. 🍻😎
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I had a laugh at the rubber glove 😅... it do be like that sometimes with these companies
Crazy how some of them operate. Jumping threw hoops for these aftermarket warranty companies can be frustrating at times. I swear some companies are looking for any loop hole to deny the claim!
I've had the latest stable release crash a few times, versions before that no real problems at all. I'm hoping it's not going to be the start of constant issues like I've had in the past with P6.........
I'm still on 7.1.13 stable. It only crashes when I make TH-cam videos 😅😀
I always learn a lot with your vids, another good case study. Just curious, what would be your best guess on the scored walls damage, dirt falling in cylinder during spark plug change???
It only had 59,xxx miles on it. I got a feeling it was a manufacturing issue that is starting to flare up. We actually have a TSB on cylinder wall issues concerning #7 . So who's to say that issue couldn't have happened in other cylinders. Just my thoughts.
Off topic question, on vehicles with secure gateway, if you tap into the twisted pair and plug it into an aldl break out box will the scan tool work just as if you hooked it up to a non-secured gateway?
Thank you in advance for your answer.
Honestly I have never tried, but I'm thinking it won't be that easy. I have went around the gateway to get scope captures of the network before.
@@CartersDiagnostics Thank you for the reply. Interesting experiment, my thinking is that if the scope can see the data packets so can the scan tool. I don't have a vehicle available to experiment at this time.
CANNY ,Carter's Diagnostics
Brilliant video
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Enjoy your weekend with all your family around you, Carter's Diagnostics
From Nick Ayivor from London England UK 🇬🇧 ⏰️ 07:33AM Good Morning 🙏 🌧
Thanks Nick, I appreciate it!
Ok I’m confused. Agree a leaky valve produced a deep expansion pocket .. normally the expansion pocket vacuum shld be very close to the intake pull vacuum … in your case the expansion pocket is much higher (less vacuum) … if it was leaking on compression it wld have more vacuum wouldn’t it???
This engine does weird things with intake valve timing and valve lift cranking and idling. (I'm actually in talks with Nissan now to get some clarification my self.) So comparing exhaust pocket to intake pocket on the same wave it kinda breaks the rules a bit. Just notice the bad cylinder had 12in.hg exhaust pocket vs. good cylinder had less than half of that. This engine has exhaust vvt intake vvt and variable valve lift vvel so lots of stuff going on. I did not unplug anything so this is raw data. Hope that clears things up some.
@@CartersDiagnostics fantastic please post Nissans reply … this can send us down that endless rabbit hole😉
@@CartersDiagnostics fantastic please post Nissans reply … this can send us down that endless rabbit hole😉
Hi. I have two questions. 25:34 Why do you show that the compression tower should be on the left side? It's not better to be further to the right, because the ignition is behind top dead center. How to determine accurate GMP without pico WPS? Thank you
It seems more normal to me for the ignition to fire BTDC, but with fuel control codes stored,( because of how I disabled the fuel for cranking test.) So who knows the ignition strategy, plus I have a leaning tower that is not giving the correct location of TDC and that throws off all measurements using the peak as a base line. What is GMP?
@@CartersDiagnostics my English is poor. Here we call GMP the top position of the piston. How can I determine the exact top point of the piston when I do not have WPS?
You could put long screwdriver in the spark plug hole and crank the motor by hand until the screwdriver reaches it highest point. At that time its either Top dead center compression or Top dead center exhaust . Or if you have a scope and scan tool. You could sample the crank sensor and an ignition sync then read the commanded ignition timing on the scantool. Then Figure out how many degrees per toggle or transition of your crank sensor in 360 degrees of your crank rotation. You then could figure out where TDC will land on the crank sensor. So for example if your ignition timing is 10degrees BTDC then move to the right of your ignition sync how ever many transitions of your crank sensor would equal 10 degrees. That would theoretically TDC compression.
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