Cam position sensing w/o a cam sensor

[Jim Blackwood]

I see. Forgot about that.

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org] On
Behalf Of Shannen Durphey
Sent: Tuesday, November 27, 2001 11:55 AM
To: diy_efi at diy-efi.org
Subject: Re: Cam position sensing w/o a cam sensor


Using crank position, opposite cylinders can initially be fired
together.  The voltage required in the cylinder w/ compression is
higher.  Lesson left over from waste spark, and similar methods might be
applicable to that system.  If you're watching cylinder #1 for this
higher voltage, you can tell whether the coil is firing during a
compression or exhaust stroke.

Shannen


Jim Blackwood wrote:
> 
> But isn't that a little circular? Assuming the purpose of sensing #1 
> is to fire #1 wouldn't sensing the spark to start the process just 
> cause more trouble?
> 
> Jim
> 
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org] On 
> Behalf Of Jason Haines
> Sent: Monday, November 26, 2001 9:42 PM
> To: diy_efi at diy-efi.org
> Subject: Re: Cam position sensing w/o a cam sensor
> 
> Some of the new ignition systems determine the cam position through 
> ionization energy or similar voltage/spark plug related methods. The 
> new L850 "world" 4 cylinder from GM (that is in the Cavalier, Sunfire,

> Vue (Saturn), Opel (can't remember the model), etc. ) uses this 
> method. No cam sensor - uses the individual cylinder ignition system 
> to determine cam position. I wonder how quickly it figures it out. I 
> am not sure what manufacturer makes the PCM/ECM.
> 
> Jason
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