DIY injector cleaning

[swagaero]

Christopher J. Bruno wrote:
> 
> > >  Andris,
> > > i guess the answer was NO there isnt a GOOD way for the DIY to clean injectors other than a additive in
> > > the tank.
> > >
> >
> > > Jimm L.
> > > the injector " guru"
> >
> >   Well, I'd like an expert's opinion, but we've been using a machine which circulates a solution of
> > gasoline and cleaner through the injectorsand fuel rails while they are on the vehicle.  It's called
> > Motorvac, and it's made by Sun Equipment.  The point of the machine is to remove carbon from the engine but
> > I have seen visible improvements in GM TBI spray patterns, and Ford port setups respond really well.
> >
> > The cleaning solution is so similar to GM's Top Engine Cleaner that we've used the GM stuff pretty
> > interchangeably.  Shouldn't be too hard to rig up a tank, pump, supply and return lines and let this stuff
> > circulate for a while.  If you could fire the injector(s) the solution could flow through them for a while,
> > and after that I'd replace the filters and O rings.
> >
> 
> Hello gang,
>         First off I would like to say thanks for the incredible
> amount of information this list has.  The discussions have re-
> sparked my interest in learning enough EE to construct my own
> circuits to drive an FI system.  I would also be very interested
> in the proper connections to the ALDL to connect to an RS-232 port.
> I haven't written much serial interface code but I'm sure I could
> learn so if anybody has this data I would gladly research the
> software side to try to supply a scanning code that would be free
> for all of us.  In any case I have a little something to offer
> on the fuel injector cleaning.
>         I haven't yet completely disassembled my newly acquired
> TPI setup which is strewn about on my basement floor as a trace
> all the wires, BUT I was working on my SHO with a friend one day
> when he showed me a very interesting way to clean the injectors
> while in the car. We took an air compressor line water filter with
> the filter removed, and filled it with straight fuel injector
> cleaner (like what you would buy at K-mart).  We then tripped the
> inertia switch on the fuel pump to shut off fuel flow and connected
> one end of the 'water filter' to the schraeder valve on the fuel
> rail.  The other end of the 'water filter' was connected to a simple
> air compressor regulator which we regulated to around 35 psi and then
> turned on the air.  We started the car and ran the straight fuel
> injector cleaner through the injectors.
>         Apparently, this is in essence the same way garages and
> dealerships use to clean the injectors while on the car (using
> perhaps slightly less kludged equipment).  Although it doesn't
> account for backflushing or screen replacement, it did make
> an excellent difference in the idling and off-idle performance
> of my car.  Not so much in power but in smoothness.  All done with
> probably $15 worth of hardware (providing you already have an
> air compressor).
>         Well, this is my mechanical advice (coming from an ME),
> but if anybody out there (I see Bruce Bowler adds a lot in this
> category) can offer tips and ideas on circuit design (perhaps
> more catered to non EE's) I know I would enjoy it.  BTW, if anybody
> has any books they can recommend for me to learn about the different
> chips (i.e. what a 555 timer is) I would appreciate it.
> 
> Thanks!
> 
> Chris Bruno
> Mechanical Engineer
> Teradyne
> 321 Harrison Ave. H63
> Boston, MA 02118
> bruno at icd.teradyne.com


goto Radio Shack get their books on 555s and opamps good primer for how
to make them tick.


Steve
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