GM tbi

[Shannen Durphey]

Steven Gorkowski wrote:

> The unit is factory all the way . This solenoid mounts are cast into the
> main body and the linkage is a integral part of the unit which connects
> to the throttle plates. Any help would be appreciated .
>
> thanks
> Steve Gorkowski
>
> Shannen Durphey wrote:
>
> > Steven Gorkowski wrote:
> >
> > > I have a Rochester Products T.B.I. unit it has stamped DESIGN UNIT
> > and a
> > > number 17090003  next to a GM logo . It looks like a standard
> > throtle
> > > body but has a solinoid that when 12v is applyed the throtle plates
> > go
> > > to wide open. The unit had a tag that said it is for a 350 ci .Do
> > you
> > > have any information on these units?
> >
> >   Hmmm.  Curious description.  Does the solenoid look like it's
> > factory
> > installed?  Is this something someone might have modified?  Some of
> > the 454
> > units had a vacuum controlled throttle stop which would keep throttle
> > plates
> > from closing too quickly when shifting (manual trans).  Maybe solenoid
> > was
> > installed there?  Or maybe it's just an idle speed control which is
> > mis-adjusted?  Anyway, I'll take a look and see if that number is good
> > or
> > crosses over to something else tomorrow.
> >
> > Shannen

  Think I've found your unit.  Found 17090004, and it fits GM medium duty
truck with 366 and governor, 89-90.  Headed back to the manuals and sure
enough, TBI with governor has an electric control motor mounted on the side
to open the throttle plates.  Throttle plate opening is limited by the
mechanical linkage, and the motor is actuated by the ECM.  Called a model
295 TBI.  Should look like an ugly, large conglomeration of linkage when
compared to a standard TBI.  Sounds like the unit to use on a teenager's hot
rod. Other than that, find a stock one. : )

Shannen