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>From: Toby Erkson <Toby_Erkson@ccm2.hf.intel.com>
>From: Owner-timjones@giza.estinc.com at SMTPGATE
> I would wish that others might profit from my screw-up. I am
>not absolutely certain of the failure mechanism, but I have now
>had my third fuel injector failure in the span of a week, and it
>looks as though I will be replacing all four.
> As near as I can tell, this is because of a cleaning technique
>that I employed some time ago. The technique was as follows:
>
> I operated the injectors on the bench using a bench power
>supply, and while operated (valve electrically held open with
>application of D.C.), I sprayed Gumout carburettor cleaner
>through the injectors. They were observed to operate normally
>at this time, including normal on-off valve action, and good
>spray cones resulting as the carburettor cleaner was sprayed
>through them. No attempt was made to flush the injectors with
>anything after this procedure, and they were put away wet.
The failure mechanism is just rust, and the error was in getting the steel
parts inside the injectors so clean that they then rusted in storage.
Usually this will cause the valves to stick, but I can imagine that there
could be rust in other parts of the injector that would later break loose
and jam up in the valve. All the VALVE parts are steel in these injectors.
There is a plastic solenoid bobbin and two o-rings and I don't know what the
carb cleaner would do to these, but it wouldn't produce these symptoms.
If you store injectors for a long period of time, a good procedure is to
dribble light oil in the back end and gently push the valve stem in until
the oil drips out the front.
Jim
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Melissa Kepner Jim Adney
jadney@vwtype3.org jadney@vwtype3.org
Laura Kepner-Adney
Madison, Wisconsin
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