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Date:         Sun, 15 May 2016 04:44:23 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Miss at idle?
Comments: To: Steven P Smith <kewsps@HOTMAIL.COM>
In-Reply-To:  <BAY175-W24617CE11A39E5009E6E83C6760@phx.gbl>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 01:08 AM 5/15/2016, Steven P Smith wrote: >How about pulling off a fuel injector connector. I did this recently >on mine and discovered that the problem (exactly as you describe) >was an intermittent bad connection inside the connector. Replaced >the connector with a GoWesty kit and problem went away, hopefully >for a long time. It had been an intermittent problem for at least >the last 20 years. No one was able to find it. I was lucky.

I'm leary but I don't see any warnings against it. Disconnecting the ECU connector is forbidden, but the injector connectors apparently not. It's an inductive load that will kick (generate a voltage spike**) if it's disconnected while an injector pulse is in process, but that's what happens anyway when the pulse ends, unless the driver has pulse-shaping circuits that give a slow turn-off. Also the presence of the other three injectors will tend to mitigate the effect to some extent.

I just replaced the connector on my Temp-II sender, which has been plaguing me for five years, and previously replaced one of the injector connectors. I think the Temp-II connection fails far more often than the sender itself does.

**inductance in a circuit limits the rate of change of current in the circuit because it causes energy to be stored in magnetic fields. When you close the circuit current builds up [more] slowly because of the energy going into expanding the field. When you open the circuit all that energy comes back as the fields collapse, and the voltage can briefly rise extremely high in order to maintain current flow as an arc across the widening gap. This is why inductive loads are rough on switches. If it's a transistor doing the switching there's no arc, but a corresponding voltage rise that can punch holes in the semiconductor. When you see a relay in one of these circuits with a resistor across the coil, that's one of the techniques to limit stress on the transistor controlling the coil. If the relay is switching an inductive load related techniques may be necessary to prevent contacts welding together as they bounce on open.

Yrs, d


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