[V8] Ingition sensors

[Kneale Brownson]

Black sensor is the ignition reference sensor, which reads the pin on the back of the flywheel.  You need it to start only.  Car runs after OK.  It's the "hot start" troublemaker.
 
The gray one is the engine speed sensor, which counts the flywheel teeth.

--- On Mon, 9/15/08, Dave Saad <dsaad at icehouse.net> wrote:

From: Dave Saad <dsaad at icehouse.net>
Subject: Re: [V8] Ingition sensors
To: "V8 Audi Fans" <V8 at audifans.com>
Date: Monday, September 15, 2008, 8:29 PM

Well...

An antilock brake sensor does work as a timing sensor - the motor  
starts right up.  I won't be able to test drive it for a while but it  
looks good.  Now I guess I need to come up with a good way to splice  
on a connector.
I currently have it installed as the "black" sensor which I think is 

the one that counts flywheel teeth.  I am going to put another one in  
for the reference sender as soon as I get another.

Dave


On Sep 15, 2008, at 1:32 PM, dsaad at icehouse.net wrote:

>
>
> As predicted - I had a timing ref sensor go bad - causing the usual  
> hot
> start problem.  After I got it out, I can see that it does indeed
> "open up" when heat is applied.  You can watch the
> resistance rapidly increase to about 2k - then poof - open.
> Actually, both sensors are doing it - meaning that they all fail after
> some period of time.  I dissected one of mine, and can see that there
> was no oil or anything in it - they just go bad from heat cycles.
>
> (btw, there is several thousand turns of 0.002" magnet wire in
> there - probably gage AWG 42.5)
>
> Now - here is the crazy part
> -
> a wheel antilock brake sensor is the same device, and comes very
> close to physically fitting.  I am going to install it and see if it
> works.  From my bench testing, these sensors are way more stable
> under heat.
>  I am also going to try to rewind my old sensor if I
> can find the wire somewhere.
>
>
> Wish me luck...
>
>
> Dave
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