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Andy_

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First time user, fuel pump waveform.
Dec 21^st, 2010 at 3:27pm

Hi guys. I am new to using labscopes. I have been using my picoscope for the last couple of weeks on cars that are not broken, just to get my feet wet. Today I used it on an 02 Ford Explorer 4.0 SOHC, eng. VIN E, that has a suspected bad fuel pump. I tried to do it like the tutorial shows how to. Please let me know what I could have done better, and please explain what the waveform shows you. I believe it is bad based on what I read in the tutorial but would like some more experienced users feedback. Thanks for your time and I hope these are not stupid questions. Andy

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02exlporerfuelpump.psdata (205 KB | )

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Andy_ Super Nerd Picogroup Offline Posts: 1,398 DeMotte, IN Indiana USA Gender:	Re: First time user, fuel pump waveform. Reply #1 - Dec 21^st, 2010 at 3:48pm sorry, let me try that again
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Mick LSD Guide Offline I learn every day Posts: 7,471 Toronto 400ft Ontario Canada Gender:	Re: First time user, fuel pump waveform. Reply #2 - Dec 21^st, 2010 at 4:30pm Shummi I like to put more time on the screen so as to see the cranking to start and idle of the fuel pump. This pump apears to be spinning real fast at 7326 rpm. Mick
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Andy_ Super Nerd Picogroup Offline Posts: 1,398 DeMotte, IN Indiana USA Gender:	Re: First time user, fuel pump waveform. Reply #3 - Dec 21^st, 2010 at 5:37pm Mick, thank you for your response. Is this more like what you mean? I went up to 500 ms per division, and then zoomed in on it? Please excuse my ignorance, I'm watching the training videos, but slowly, as to take it all in.
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Andy_ Super Nerd Picogroup Offline Posts: 1,398 DeMotte, IN Indiana USA Gender:	Re: First time user, fuel pump waveform. Reply #4 - Dec 21^st, 2010 at 5:38pm now zoomed in
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fisher Super Nerd Picogroup Offline Deceased Posts: 2,734 Concord California USA Gender:	Re: First time user, fuel pump waveform. Reply #5 - Dec 21^st, 2010 at 6:01pm Excuse me, in the bottom left corner of the PICO is: ms +2.0s. What are those, Tom, somebody? I think I see that ms = 813.7 thru 829.3 ms
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daveyK Super Nerd Picogroup Offline (Retired) - Elevation: 525 feet Posts: 2,357 Hellertown, PA, USA Pennsylvania USA Gender:	Re: First time user, fuel pump waveform. Reply #6 - Dec 21^st, 2010 at 7:18pm fisher, from what I have noticed/seen that would be 2.813 thru 2.829 ms time frame. the zoom wackes the 2 ms into the .813 part. if you zoom a capture and then scroll thru you will see when you get to 2.0 ms 999.9 it will change to 3.0ms. Pico can zoom that close HTH dave
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Mick

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Re: First time user, fuel pump waveform.
Reply #7 - Dec 21^st, 2010 at 7:29pm

Andy_ wrote on Dec 21^st, 2010 at 5:37pm:

Mick, thank you for your response. Is this more like what you mean? I went up to 500 ms per division, and then zoomed in on it? Please excuse my ignorance, I'm watching the training videos, but slowly, as to take it all in.

Schumi

Yes thats about the time thats good

Can you post that psdata file please?

If the file is over 7MB then we have a drop site to assist in sharing large files.

The training videos are great.
The Pico presets in automotive help section are not the best setups

Did you change the pump and capture a after wave form of the new pump?
If you did the pump, did you change the filter as well?

Mick

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Mick

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Mick

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Re: First time user, fuel pump waveform.
Reply #8 - Dec 21^st, 2010 at 7:37pm

fisher wrote on Dec 21^st, 2010 at 6:01pm:

Excuse me, in the bottom left corner of the PICO is: ms +2.0s.
What are those, Tom, somebody? I think I see that ms = 813.7 thru 829.3 ms

Dave and Don

The 2s is because on this file the lenght of time on the screen was 5 seconds, that would be 500ms per div.
Schumi had zommed in 813.7ms past the 2 second point to 893ms

Mick

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Mick

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Andy_ Super Nerd Picogroup Offline Posts: 1,398 DeMotte, IN Indiana USA Gender:	Re: First time user, fuel pump waveform. Reply #9 - Dec 21^st, 2010 at 7:42pm No Mick, I didn't change the fuel pump yet, but will also change the filter, and will get an after waveform as well. Am I correct that this waveform doens't look right? How do I post the psdata file?
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Mick

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Re: First time user, fuel pump waveform.
Reply #10 - Dec 21^st, 2010 at 8:10pm

Andy_ wrote on Dec 21^st, 2010 at 7:42pm:

No Mick, I didn't change the fuel pump yet, but will also change the filter, and will get an after waveform as well. Am I correct that this waveform doens't look right? How do I post the psdata file?

You posted a psdata file in your first post.

How big is the 5 second file

Mick

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Mick

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fisher Super Nerd Picogroup Offline Deceased Posts: 2,734 Concord California USA Gender:	Re: First time user, fuel pump waveform. Reply #11 - Dec 21^st, 2010 at 8:17pm Thank you.
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Spence

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Re: First time user, fuel pump waveform.
Reply #12 - Dec 21^st, 2010 at 8:17pm

Andy_ wrote on Dec 21^st, 2010 at 3:27pm:

Hi guys. I am new to using labscopes. I have been using my picoscope for the last couple of weeks on cars that are not broken, just to get my feet wet. Today I used it on an 02 Ford Explorer 4.0 SOHC, eng. VIN E, that has a suspected bad fuel pump.

What is the customer concern and what lead you to believe you should of done this test?

I tried to do it like the tutorial shows how to.

They are a big help. They will get you up to speed faster.

Please let me know what I could have done better, and please explain what the waveform shows you. I believe it is bad based on what I read in the tutorial but would like some more experienced users feedback.

It's a little on the fast side but not to much from what I have seen from Fords.

Thanks for your time and I hope these are not stupid questions. Andy

They are not stupid questions

Thanks for posting what you have. Wink

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Andy_

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Re: First time user, fuel pump waveform.
Reply #13 - Dec 21^st, 2010 at 8:35pm

Spence, the customer's concern was it died out in a parking lot. It cranked but would not start. Once I got it in the shop it started. I scanned it and had P0231-fuel pump secondary low. Most of the time it runs fine, but I have had a few times where it will start for a few seconds, then the fuel pressure drops of and it dies, also a few times it blew the fuel pump fuse, so I figured this would be a good time time try to scope a fuel pump. I wasn't so worried about the speed, but on the sample waveform, the current peaks are much more even, what do you think of the one that I posted, thanks for your help.

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Andy_ Super Nerd Picogroup Offline Posts: 1,398 DeMotte, IN Indiana USA Gender:	Re: First time user, fuel pump waveform. Reply #14 - Dec 21^st, 2010 at 8:47pm Mick, the 5 second file is 407 KB
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