Pulse Sensor NO NO

Рет қаралды 3,055

9 ай бұрын

A quick tip when using a pressure transducer and a pulse sensor at the same time. Its a NO NO!
Autonerdz link for your picoscope needs
autonerdz.com/?wpam_id=2

Пікірлер: 53

@glenforehand 6 ай бұрын

You know the saying there’s mechanics and there’s technicians, I’ve often thought there’s a third category and this video displays it nicely. Great work!

@CartersDiagnostics 6 ай бұрын

Wow Thank you! Knowledge is power in this game . Hopefully this will help people from taking the wrong path on their diagnosis.

@autoemmissions3904 9 ай бұрын

Thank you for taking the time to educate those that want to learn.

@CartersDiagnostics 9 ай бұрын

My pleasure!

@alexgoldstein7997 9 ай бұрын

I think you are on the right track with your theory of the added volume affecting the speed of the crank.

@CartersDiagnostics 9 ай бұрын

👍

@spirokattan3655 9 ай бұрын

Hi Mike, Many times I see Bernie (ATS) measure in-cylinder and intake pressures simultaneously without any apparent anomalies. What you point out is very interesting. I will keep that in mind... Thanks for sharing! I wish you and your family a Happy and Healthy New Year!

@CartersDiagnostics 9 ай бұрын

Yea I've seen his videos. I think his pressure sensors are all absolute pressure not pulse sensors ,the effect may be different. I only have 1 absolute pressures sensor, so I h have not experimented yet. Happy New Year.

@matthewdale174 9 ай бұрын

Agree hundred percent on added volume reducing compression affecting crank shaft speed You can see the same effect with wps and when doing a relative compression test. Great info mike Happy new year🎉

@CartersDiagnostics 9 ай бұрын

Happy New Year !

@billyyoder8171 9 ай бұрын

Great job. Thank you for sharing. Happy New Year to you and your family.

@CartersDiagnostics 9 ай бұрын

I appreciate that. Happy new year as well!!

@advancedleveldiagnostics 9 ай бұрын

Great info. Thanks for sharing! I find the same is true when doing a relative compression with the wps500; that cylinder will be slightly lower.

@brandonsteckler3417 9 ай бұрын

This occurs due to the added volume from the compression hose. A smaller hose (less volume) will reduce this effect

@CartersDiagnostics 9 ай бұрын

I guess if you go into it knowing what to expect its not to bad. I have never done RC and in cylinder at the same time. I just don't trust it. Thanks for adding to the conversation.

@advancedleveldiagnostics 9 ай бұрын

@@brandonsteckler3417 Thanks! Any hose you can recommend that's better than the one that comes with the WPS500?

@gfbemc0256 9 ай бұрын

Hi Mike, thanks for the video, I greatly appreciate you sharing this information. I believe the First Look Sensor and the “pulse” sensor are both “delta pressure sensors”? Is there a reason you chose not to use the First Look in the intake manifold & vice versa?

@CartersDiagnostics 9 ай бұрын

I think the term pulse sensor and delta sensor are 1 in the same. I use my store bought first look sensor in the exhaust simply because its tougher than my home-made pulse sensor. It would do a fine job in the intake as well.

@markferraro5250 9 ай бұрын

Excellent point MIKE

@CartersDiagnostics 9 ай бұрын

👍

@brandonsteckler3417 9 ай бұрын

I believe the explanation is due to the EVO for the in-cylinder capture occurring at the same time as the overlap event for another cylinder. This additional volume reduces the effect of the intake pull on the manifold, leading to the “weak pull” you have displayed. My theory is this will not be as apparent in a 6- or 8-cyl configuration

@CartersDiagnostics 9 ай бұрын

Interesting theory i will have to rack my brain on it for a while. With my equipment 6 cylinders show an issue, I will have to revisit an 8 (its been a while) I personally just stopped all in cylinder and pulse sensor testing simultaneously, its to risky for me. Thanks for stopping by and commenting!

@ablackformula 9 ай бұрын

Interesting! This would be a fun test to repeat next time you're changing an exhaust manifold gasket. Then the exhaust volume won't be connected to other cylinders.

@scottj9043 9 ай бұрын

This would be great to bring up in the group therapy

@CartersDiagnostics 9 ай бұрын

I may have to do that!

@ablackformula 9 ай бұрын

Here's a fun comparison test: install an old-school compression tester in the plug hole (to have the hose add the extra volume to the cylinder.) Use a vacuum "T" to measure the intake manifold - one side to a pulse sensor, the other to your wps 500 set on absolute pressure. This test would show the pulse sensor having your anomaly (presumed by the change in engine speed,) but I'd expect the wps 500 to show each cylinder creating equal pressure pulls. This could prove how much engine speed variances affect the pulse sensor.

@CartersDiagnostics 9 ай бұрын

That would be a cool project. Going to have to put it on my list.

@brandonsteckler3417 9 ай бұрын

You got it!

@BartLiperz 9 ай бұрын

I would like to see a pressure waveform overlay. Is the anomaly you are looking at coming from the cylinder with the pressure transducer in it?

@CartersDiagnostics 9 ай бұрын

No its actually its companion cylinder #4 showing the anomaly.

@baja-automotive 9 ай бұрын

Good job 🎉

@CartersDiagnostics 9 ай бұрын

🥳

@kyletuttle9064 9 ай бұрын

Thanks for sharing this with us.your insight is really cool.

@CartersDiagnostics 9 ай бұрын

No problem 💯

@alexandrumardare828 Ай бұрын

Shorter Adapter Hose would make a difference probably

@stevepark5504 9 ай бұрын

The piston is stopped at TDC, accelerates to max at 90*, decelerates to stopped at BDC. If the rate of change(speed) of the cylinder pressure, that the pulse sensor is responding to, affected the sensor’s output, then the output would be a curve instead of the linear straight line.

@CartersDiagnostics 9 ай бұрын

If you have captures displaying what you are saying I would love to see them. Thanks for commenting.

@victorhoover4803 2 ай бұрын

thank you for taking the time and sharing with us that thuly want to learn!!! we really appriciated you , i have a question when do you want to isolate the crankcase ventilation systems i seen some videos were the block it thank you and i hope my question makes sence lol

@CartersDiagnostics 2 ай бұрын

I really never have a script I follow when doing advanced testing. I have some basic rules that I follow like this video. When in doubt , I would test with it blocked and not blocked and compare. My latest video (Mis-fire Fun) had pressure building in the crankcase, it never showed in the intake or exhaust pulses and I did not block the PCV sytem. It definitely showed in the crankcase test. That may have been due to PCV system design, some other engines may have showed differently. Just don't box yourself in and limit your testing. To much info is never a bad thing.

@victorhoover4803 2 ай бұрын

@@CartersDiagnostics thank you for your response, Also I was doing some test at the tail pipe on a 21 4runner using the wps and I was trying to get a good waveform and I just couldn't get it to were its was easy to understand or read it do you have videos using the wps in the tailpipe thanks.

@CartersDiagnostics 2 ай бұрын

I use a first look sensor for tailpipe testing, not my wps (just personal choice) the wps should work just fine if you use it it zoom mode not range mode. Most all my mis fire videos i use a pulse sensor in the exhaust and try to explain how to id the bad cylinder

@victorhoover4803 2 ай бұрын

@@CartersDiagnostics i will try that today car has no problems but i just want to learn how to read this waveforms and your videos are helping a lot of us that want to learn,thank you once again, if i ever need help reading a waveform can i send it your way 😅

@CartersDiagnostics 2 ай бұрын

Sure. I get lots of files sent to me. Some I can help some I can't but I always look. papaslop@yahoo.com is my email.