Date: Thu, 12 Aug 2010 10:02:40 -0700
Reply-To: Karl Wolz <wolzphoto@Q.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Karl Wolz <wolzphoto@Q.COM>
Subject: Re: AFM intermittancy result?
In-Reply-To: <4C640021.7050803@gmail.com>
Content-Type: text/plain; charset="US-ASCII"
That would be near instantaneous. You would just feel a bit of a hiccup.
Dave just posted a procedure that involved grounding the AFM itself, which I
don't believe was done on my van; might be worth a try.
Have you had any issues since putting in the new ECU?
Karl
|-----Original Message-----
|From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
|Mike "Rocket J Squirrel"
|Sent: Thursday, August 12, 2010 7:07 AM
|To: vanagon@GERRY.VANAGON.COM
|Subject: Re: AFM intermittancy result?
|
|So a small bad spot on the AFM track would cause the ECU to shut off the
|injectors, resulting in a full lean condition and immediate loss of
|power. When that happens, the AFM's wiper will swing to another part of
|the track, causing the ECU to start firing the injectors again, causing
|the engine to pick back up.
|
|I wonder how many seconds that process would take -- from "Hey, the
|wiper has lost contact with the track so I'm shutting off the
|injectors!" to "Oops, I see contact again and will start firing the
|injectors!"
|
|--
|Rocky J Squirrel
|
|
|Scott Daniel - Turbovans wrote:
|> I think that will cause the injectors to not be fired by the ecu.
|>
|> it won't affect fuel pump ....
|> since it will start and idle with no air flow meter at all,
|> or AFM unplugged.
|>
|> I'm guessing that if it's not at WOT or Idle ..
|> it depends on AFM contact to keep the injectors firing.
|>
|> ( ecu keeps fuel pump relay energized because it sees the engine turning
|> from the ignition system. )
|>
|> Scott
|> turbovans.com
|>
|>
|> ----- Original Message ----- From: "Mike "Rocket J Squirrel""
|> <camping.elliott@GMAIL.COM>
|> To: <vanagon@GERRY.VANAGON.COM>
|> Sent: Wednesday, August 11, 2010 6:05 PM
|> Subject: AFM intermittancy result?
|>
|>
|>> What will the ECU tell the engine to do if the AFM's wiper loses contact
|>> with the track with the engine under high load condition, throttle
|>> depressed but not WOT (i.e., neither microswitch on the throttle
|>> assembly activated)?
|>>
|>> --
|>> Rocky J Squirrel
|>> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
|>> 74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.)
|>> Bend, OR
|>> KG6RCR
|>
|