I had a coach that had a off idle stumble when under load. Fully warmed up
and running in closed loop. Howell system with EBL. Tried couple of
different Binary files, no joy. Turns out that Randy VanWinkle was in my
area at the time, and he and I spent a couple of days on the coach and
cured the stumble, but it still had driveability issues. When he left and
returned to Missouri, we hooked up live output from the coach to his
computer in Missouri, I drove the coach duplicating the problems, he
captured them on his end, and took them apart, then accessed my EBL and
fixed it. Ain't the information age sumpthin'? Way better than a fuel flow
meter and a seat of the pants guess, cut,'n try, and repeat technique. Not
criticism of you, just trying to help you by giving you insight into what
this community can do to help you out.
Jim Hupy
Salem, Oregon
On Sun, Feb 7, 2021, 1:29 PM Ken Henderson via Gmclist <
> Tom,
>
> You didn't mention the EBL upgrade for the Howell EFI. I personally
> wouldn't bother without that mod. I spent several months trying to
> eliminate an off-idle stumble when I first installed Howell. Multiple
> EPROMS from Howell and others didn't fix it. Finally, I bought
> and soldered in the EBL mod. I cranked the engine to see that it still
> ran, then shut it down. The next morning we got in the coach and went to a
> rally 80 miles away. The stumble has not returned yet -- probably
> 50-60,000 miles or more.
>
> I'd suggest spending the fuel flow meter money on the EBL. It does the
> same as the modern cars: Counts the injector pulses it sends and, after
> calibration, converts that known quantity of fuel to MPG. Trivial when
> you've got a computer and the data. No need to install and calibrate a
> swinging gate fuel flow transmitter and one less meter to worry about
> (assuming you mount a tablet on the dash as many of us who are addicted to
> tinkering with EBL do).
>
> Ken H.
>
>
> On Sun, Feb 7, 2021 at 3:25 PM tomkatz3--- via Gmclist <
>
> > John, - Aircraft spruce carries them. It was some time ago and I don't
> > know what the price was then. I saw a display only for sale on ebay for
> > $200.00. I don't know what the transducer cost is? They must be
> calibrated
> > together along with the location of the transducer in the fuel line.
> >
> > Ken, - Thanks again! very useful information and makes a lot of sense. I
> > don't know how the modern cars do it? Maybe just installing a vacuum
> guage
> > will suffice for engine efficiency. I am installing the Howell Fuel
> > injection system with the electronic ignition. I haven't opened the box
> as
> > of yet
> > and just purchased the O2 sensor boss (18mm x 1.5 nut) to weld in
> > tomorrow. I think it is best for me to find the full capabilities of the
> > soft ware
> > before I add too much.
> >
> > I am also welding in a 1/2" x 20 boss (grade 8 nuts) for the trans pan
> and
> > for the final drive drains.
> >
> > My flying buddies are always wondering where I am? I have been having so
> > much fun working on this motorhome. I built my own helicopter, but I
> don't
> > think that was half as much fun as this! I am now striping the exterior
> to
> > get ready for the paint shop.
> >
> > After Oki's radiation and operation, I am looking forward to another work
> > party. We had a lot of fun at the last one and now I got Ken Frey a new
> > griddle. His cooking pushed the event over the top.
> >
> > Take care all, stay healthy and thanks so much for all the wonderful
> > advise and help!
> >
> > Tom & Oki
> > --
> > Tom & Oki Katzenberger,
> > Kingsville, Maryland,
> > 1977 23' Birchaven, 455 C.I.D.
> >
> >
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