Re: [T3] FI problems... of course

["Drake ." <vw_type3@hotmail.com>]

<x-flowed>Im not sure what the voltage of the trigger that is sent to the injectors, 
whe I was checking mine though I found that the Vavg on all 4 injectors was 
somewhere about .89VDC (If I remember correctly). That figure would of 
course depend on the impedence and speed of the meter you use to check the 
signal. I checked it this way just to determine that all 4 injector were 
receiving approximately the same signal. One of these days ill have to get a 
o'scope at home to check things like this :)


----Original Message Follows----
From: "Mark Fuhriman" <mfuhriman1@hotmail.com>
Reply-To: <type3@vwtype3.org>
To: <type3@vwtype3.org>
Subject: Re: [T3] FI problems... of course
Date: Thu, 25 Jul 2002 19:27:13 -0700

> injector. When i hook up the voltmeter to the injector wires I get 12v. I

?? You are measuring 12V right at the injectors?  I think the brain sends 
only about 2 or 3V to the injectors.  I believe they'll burn up at 12V.

> Yeah, the manual is on the way now. The only thing I have to go by now is
> Muir's FI system diagram which is not very helpful.

I find Muir's FI diagnosis routine to be pretty helpful.  Spend an afternoon 
going through it step by step, with the right wiring diagram in front of 
you, and you will learn a lot.  You really do need the Bentley for the right 
diagram.  Note the FI wiring varies somewhat by year, but Bentley covers 
this.  Another good resource is the VW/Porsche FI manual by Elfrink.  There 
were two editions: one published in about 1971 I think, and the other in 
about 1974, which you would need if you have a 72 or a 73.  Both editions of 
the Elfrink are long out of print, but I have heard of copies surfacing out 
there.  Maybe on eBay?  I found mine at a local used book shop.

-Mark Fuhriman

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