Date: Mon, 25 Jun 2007 16:50:14 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Dead 83.5 Westy (injector power)
In-Reply-To: <4783ce9d0706251027q4cfef4d2s816fab67419544f8@mail.gmail.com>
Content-Type: text/plain; format=flowed
All the injectors are wired in parrallel. If one works, they all should
work. The auto stores have "Noid" lights that plug inot the injector plugs
for power testing.
When the fuel pump is running, one side of the injecors has straight 12
volts. The ECU completes the connection to the chassis to fire the injector.
No +12 volt, wiring problem, no trigger from the ECU, ECU problem. The ECU
output transistor can fail. Shorted is the worse as it fills the cylinders
with fuel. There could also be a reason for the ECU to not operate the
injectors.
Dennis
>From: Erik Peterson <motoerik@GMAIL.COM>
>Reply-To: Erik Peterson <motoerik@GMAIL.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Dead 83.5 Westy (injector power)
>Date: Mon, 25 Jun 2007 19:27:08 +0200
>
>I tried to test the injector signal with a test lamp, but the leads
>kept falling out of the plug when I cranked the engine, and I was by
>myself. I am pretty sure (but kinda assuming) that the injectors are
>not getting the signal. The wiring checks good, the injectors ohm
>good, and I temp installed the old injectors just in case (no spray).
>
>RE: "I think it is more likely that the injectors are not getting the
>signal to open up." Me too. What would cause that, besides the ECU?
>
>**side note** It was a major PITA getting the timing light to indicate
>spark, I taped the trigger switch down & the wires barely reached from
>the battery to the plug wires. I'll never be able to actually check
>the timing that way... My remote starter switch is also worthless to
>me, considering the battery location. Is there an easy way to use
>these things on a Vanagon, or do I need battery extension cables?
>
>Erik
>
>On 6/25/07, Jake Beaulieu <jbeaulie@nd.edu> wrote:
>>"So I pulled the left injectors out to see if they were spraying, and
>>BINGO!, they're not! I'm excited at this point, because I've found the
>>problem, right?
>>I did all the VO meter checks on page 24.20 of the Bentley, and
>>everything checked good."
>>
>>I am not certain off hand which tests are described in 24.20 of the
>>Bentley, but did you look for a signal at the injectors when the starter
>>is engaged? Bentley reccomends doing this with a test light rather than a
>>multi meter. If you are getting both fuel pressure and a signal to the
>>injectors, yet the injectors are not squirting fuel, this suggests the
>>injectors are toast. I think it is more likely that the injectors are not
>>getting the signal to open up.
>>
>>jake
>>
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