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Misfire detection with maths channel? (Read 266 times)

Ward Zintel

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Misfire detection with maths channel?
Sep 10^th, 2015 at 5:23am

Hello!
A while back I thought I saw a thread about an article someplace where a person had a crank signal saved. If I remember right they used the math channel to find the bad cylinder.
I could have sworn I saved that one so I could go look at it and try it out on my truck once the new engine and injection system were in.
I now have a running truck and was looking for the
topic or article and can't find it! I am still looking, but if anybody knows where it is off the top of their heads a hint (or link) would be appreciated! Smiley

-Ward-

Wayne's Driveline
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Spence

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Re: Misfire detection with maths channel?
Reply #1 - Sep 10^th, 2015 at 7:32am

Hi Ward I have been working on this and the math can show where to head with your diag. Once you have what is know good seeing the bad is extremely interesting. If you have a miss yet the signal slows up but does not speed up on the bad cylinder look for fuel and/or ignition. If the crank does not slow up when coming to TDC on the cylinder in question look for mechanical issues. This is just a small glimpse into what I have been documenting.

Be glad to see whatever you have captured.

N.B.S. Dilly Dilly! FJB

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busjockey

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Re: Misfire detection with maths channel?
Reply #2 - Sep 10^th, 2015 at 8:28am

One more thing to add Ward,actually a couple things, math channels are super easy to set up now that the software auto ranges for you, so just select a frequency channel for whichever channel you have the crank signal on and then use your vertical zoom, this will help see the cylinder deceleration much better. Post what you got so we can look.

Busjockey

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Ward Zintel Super Nerd Picogroup Offline Posts: 632 Saskatoon Saskatchewan Canada Gender:	Re: Misfire detection with maths channel? Reply #3 - Sep 10^th, 2015 at 10:09am Hello Spence, Busjockey! I have nothing to post yet - I got my truck done so I was going to read the article and then give it a try. I am assuming a few seconds of CKP is what I need but I have yet to read the article. -Ward-
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Spence

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Re: Misfire detection with maths channel?
Reply #4 - Sep 10^th, 2015 at 11:38am

Ward Zintel wrote on Sep 10^th, 2015 at 10:09am:

Hello Spence, Busjockey!
I have nothing to post yet - I got my truck done so I was going to read the article and then give it a try.
I am assuming a few seconds of CKP is what I need but I have yet to read the article.
-Ward-

Hi Ward if you are going to base line an engine try it with a load such as in drive.

After doing that unplug an injector or coil/plug wire and have another capture to compare.

Have a cylinder to ID the CKP... Post it with the firing order and let us tell ya the cylinder you disabled.

Enjoy!

N.B.S. Dilly Dilly! FJB

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spencedecordre

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Andy_ Super Nerd Picogroup Offline Posts: 1,398 DeMotte, IN Indiana USA Gender:	Re: Misfire detection with maths channel? Reply #5 - Sep 10^th, 2015 at 6:43pm Hey Spence, do you have any captures showing what you're talking about. This sounds interesting to me. -Andy
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royd

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Re: Misfire detection with maths channel?
Reply #6 - Sep 11^th, 2015 at 7:28am

Ward Zintel wrote on Sep 10^th, 2015 at 5:23am:

Hello!
A while back I thought I saw a thread about an article someplace where a person had a crank signal saved. If I remember right they used the math channel to find the bad cylinder.
-Ward-

Maybe this: It's a response from Steve Smith (pico staff) to a question posted on iATN.

http://members.iatn.net/forums/read/msg.aspx?f=forum8&m=159891&fv=0&ar=1442

But if I seem to act unkind
It's not me, it's just my mind...

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busjockey

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Re: Misfire detection with maths channel?
Reply #7 - Sep 12^th, 2015 at 3:46am

Andy_ wrote on Sep 10^th, 2015 at 6:43pm:

Hey Spence, do you have any captures showing what you're talking about. This sounds interesting to me. -Andy

Here is a thread I was doing with help from the fellow Nerdz. It's on a Diesel Transit Bus but it's the same concept.
http://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1391235742;start=0;action=threadp...

Busjockey

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Andy_ Super Nerd Picogroup Offline Posts: 1,398 DeMotte, IN Indiana USA Gender:	Re: Misfire detection with maths channel? Reply #8 - Sep 12^th, 2015 at 5:36am Thanks for that, busjockey. I have a lot to read on math channels, they confuse me. -Andy
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