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From: JeB on 29 Mar 2007 13:01
>I was adjusting/measuring the TPS when I noticed that the vaccuum diagram
>under the hood didn't match the diagram in my Haynes manual. There is a
>place in the throttle body when 4 vaccuum lines connect to the TB very close
>to each other (near the front). Two of those (I think the middle two) were
>swapped according to the under the hood diagram. I swapped those and never
>had another problem with the flat spot. It could have just as easily been
>the TPS adjustment, but one of those two things fixed the flat spot.

did you manage to adjust the TPS on the truck or did you remove it?
A quick peek in that region yesterday suggests it might be a bear to
work on the thing on the truck.


From: M.Paul on 30 Mar 2007 11:09

"JeB" <no(a)spam.org> wrote in message
news:mlvn03tv1kqd6fljhtkt8arqoavoc6lgm8(a)4ax.com...
> >I was adjusting/measuring the TPS when I noticed that the vaccuum diagram
> >under the hood didn't match the diagram in my Haynes manual. There is a
> >place in the throttle body when 4 vaccuum lines connect to the TB very
close
> >to each other (near the front). Two of those (I think the middle two)
were
> >swapped according to the under the hood diagram. I swapped those and
never
> >had another problem with the flat spot. It could have just as easily
been
> >the TPS adjustment, but one of those two things fixed the flat spot.
>
> did you manage to adjust the TPS on the truck or did you remove it?
> A quick peek in that region yesterday suggests it might be a bear to
> work on the thing on the truck.

Maybe I'm using the wrong terminology. There's a resistance spec for the
device that measures the position of the butterfly valve in the throttle
body. I assume that it is the Throttle Position Sensor - maybe it's called
something else?. You can adjust/calibrate where the "stop" is - idle
position. Then as the butterfly valve is opened (as with accellerator
cable) the resistance value of the sensor (potentiometer?) increases. This
sensor is pretty much at the front of the throttle body, so it's not
difficult to get at. I did not remove the sensor.


From: JeB on 30 Mar 2007 16:13
>>
>> did you manage to adjust the TPS on the truck or did you remove it?
>> A quick peek in that region yesterday suggests it might be a bear to
>> work on the thing on the truck.
>
>Maybe I'm using the wrong terminology. There's a resistance spec for the
>device that measures the position of the butterfly valve in the throttle
>body. I assume that it is the Throttle Position Sensor - maybe it's called
>something else?. You can adjust/calibrate where the "stop" is - idle
>position. Then as the butterfly valve is opened (as with accellerator
>cable) the resistance value of the sensor (potentiometer?) increases. This
>sensor is pretty much at the front of the throttle body, so it's not
>difficult to get at. I did not remove the sensor.
>

You've got the terminology correct. A quick glance was all I took
and thought it might require removing the TPS to make the
adjustment. Apparently not. Thanx for all the feedback.


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