[Diy_efi] re: Problem with cam mounted optical trigger sensor

Mon Apr 10 21:43:37 UTC 2006

There is a 5v pull up inside the ecu. This pulls any rising edge to the full 5v. When you rotate the sensor and it is not connected to the pull up, the rising edge of the signal gets smaller the faster you rotate. It gets down as low as 0.4v. 
  I was originally feeding the sensor only 5v and the signal was even lower. I now feed the sensor a 12v supply and the signal is higher at 0.4v. Possibly the noise is creating a tiny rising edge and the pull up inside the ecu is pulling this high to 5v thus creating a false reading?

  The pull up resistor is 680ohm. This seemed a very low value to me for a pull up but thats what Walbro told me to fit. Do you think changing this value would help me?

  I am going to try to get a scope that can log output. Then I can confirm that there are extra rising edges. I can't tell with my cheap nasty scope because its just a very jumbled square wave.

  Damian

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Today's Topics:

1. re: Problem with cam mounted optical trigger sensor (Damian Long)
2. Re: re: Problem with cam mounted optical trigger sensor
(mark krawczuk)

----------------------------------------------------------------------

Message: 1
Date: Mon, 10 Apr 2006 17:21:19 +1000 (EST)
From: Damian Long 
Subject: [Diy_efi] re: Problem with cam mounted optical trigger sensor
To: diy_efi at diy-efi.org
Message-ID: <20060410072119.70708.qmail at web50309.mail.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

Ok, well I've all but given up. Saturday I was ready to give up and I may just do that and try find someone with the knowledge to fault find the problem.

I've thought some more about what is going on. If the signal coming from the optical sensor is clean then the problem is at the sensor right? I mean if I have a dirty signal I should see it on the scope shouldn't I? The problem is still EMI related because changing the plug leads made such a difference.

My thinking then is that the problem is assisted by the EMI but is in fact in the sensor. Possibly thermal expansion (as Jay mention to me earlier) is causing misalignment in the sender reciever or extending distance between just that little bit. In turn the EMI is enough to trigger a false falling edge inside the conditioning circuit. Possible? I don't know. But the signal is clean and the ecu rpm jumps all over the shop in spikes just like EMI causes, but the scope signal looks clean.

Matt, I tried calling you a couple times. I sent you an email also. Would love to catch up if only for a chat about my issues. My no. is 0421912980

thanks

Damian Long

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Today's Topics:

1. Injector offset vs voltage (Daniel Nicoson)

----------------------------------------------------------------------

Message: 1
Date: Sat, 8 Apr 2006 22:10:50 -0400
From: "Daniel Nicoson" 
Subject: [Diy_efi] Injector offset vs voltage
To: "DIY_ EFI" 
Message-ID: 
Content-Type: text/plain; charset="iso-8859-1"

Anyone have the table showing the standard size Ford injectors and their
corresponding voltage offsets? (19#, 24#, 30#, 36#, 42#)

I thought I had it saved on my hard drive but for the life of me, I can't
find it.

I also had a link to it on the www.nilesedge... web site but that thing is
gone now.

I've been all over Google and several discussion groups "files sections" and
I can't find it.

Any help?

Thanks,

Dan Nicoson

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Message: 2
Date: Mon, 10 Apr 2006 17:29:30 +0930
From: "mark krawczuk" 
Subject: Re: [Diy_efi] re: Problem with cam mounted optical trigger
sensor
To: 
Message-ID: <001901c65c74$b2932fb0$6baef0dc at marka7e6m8swbp>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

hi, is the signal level high enough ? might be clean but not high enough,

mark k

----- Original Message ----- 
From: "Damian Long" 
To: 
Sent: Monday, April 10, 2006 4:51 PM
Subject: [Diy_efi] re: Problem with cam mounted optical trigger sensor

> Ok, well I've all but given up. Saturday I was ready to give up and I may 
> just do that and try find someone with the knowledge to fault find the 
> problem.
>
> I've thought some more about what is going on. If the signal coming from 
> the optical sensor is clean then the problem is at the sensor right? I 
> mean if I have a dirty signal I should see it on the scope shouldn't I? 
> The problem is still EMI related because changing the plug leads made such 
> a difference.
>
> My thinking then is that the problem is assisted by the EMI but is in 
> fact in the sensor. Possibly thermal expansion (as Jay mention to me 
> earlier) is causing misalignment in the sender reciever or extending 
> distance between just that little bit. In turn the EMI is enough to 
> trigger a false falling edge inside the conditioning circuit. Possible? I 
> don't know. But the signal is clean and the ecu rpm jumps all over the 
> shop in spikes just like EMI causes, but the scope signal looks clean.
>
> Matt, I tried calling you a couple times. I sent you an email also. Would 
> love to catch up if only for a chat about my issues. My no. is 0421912980
>
> thanks
>
> Damian Long
>
> diy_efi-request at diy-efi.org wrote:
> Send Diy_efi mailing list submissions to
> diy_efi at diy-efi.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.diy-efi.org/mailman/listinfo/diy_efi
> or, via email, send a message with subject or body 'help' to
> diy_efi-request at diy-efi.org
>
> You can reach the person managing the list at
> diy_efi-owner at diy-efi.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Diy_efi digest..."
>
>
> Today's Topics:
>
> 1. Injector offset vs voltage (Daniel Nicoson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 8 Apr 2006 22:10:50 -0400
> From: "Daniel Nicoson"
> Subject: [Diy_efi] Injector offset vs voltage
> To: "DIY_ EFI"
> Message-ID:
> Content-Type: text/plain; charset="iso-8859-1"
>
> Anyone have the table showing the standard size Ford injectors and their
> corresponding voltage offsets? (19#, 24#, 30#, 36#, 42#)
>
> I thought I had it saved on my hard drive but for the life of me, I can't
> find it.
>
> I also had a link to it on the www.nilesedge... web site but that thing is
> gone now.
>
> I've been all over Google and several discussion groups "files sections" 
> and
> I can't find it.
>
> Any help?
>
> Thanks,
>
> Dan Nicoson
>
>
>
>
> ------------------------------
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/diy_efi
>
>
> End of Diy_efi Digest, Vol 14, Issue 9
> **************************************
>
>
>
> ---------------------------------
> On Yahoo!7
> Music: Create your own personalised radio station.
> _______________________________________________
> Diy_efi mailing list
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> http://lists.diy-efi.org/mailman/listinfo/diy_efi 

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