89 tracker 8V TPS issues.. need help

[Jasenford]

i recently took my motor out and had to take the actual TPS off... i wasnt able to disconnect it.. now im not sure how it went on., i didnt know it was spring loaded.. when i put it on, the throttle plate opens a significant amount, i tried adjusting the idle screw to see if the plate would close, but only closed a little bit... now im stuck
plz help
thanks

[jtgh]

that was a big mistake , adjusting the throttle plate screw. its a factory adjustment
that balances the IAC idle controller to the center of its range.

i guess instead of unplugging it , you just unbolted it. ?
no big deal that, but don't mess with throttle screw unless , last resort.

here is mine, factory set and painted white.
http://carfix.stufftoread.com/fresh-...rfly-gap1w.jpg

89" i don't know the gap. (helppppppppp)

TPS testing

since you wrecked the idle, now the TPS can not be adjusted.

the tps is set to 0.020" of idle preload.
the buttery gap is 10 times that.

ouch.


in the old days,
back in carbs and wooden hulls.
they taught in school. (trade auto back then)
always count the turns to the stops before adjusting anything.
so
if you want to undo something you did wrong. ,you can.
a regression path.

we now have that gap logged here for all cars but 89/90
91 to 95 , 8v and 16v we have it.
have a starting point, is everything.

cheers.

[randy h]

Originally Posted by jtgh

we now have that gap logged here for all cars but 89/90

Jasenford, you may be interested in bidding on the 89 Tracker Factory Service Manual linked below. That might provide some of the info you need. It is listed as buy-it-now for 15 dollars plus 6 dollars shipping.

I am not affiliated with seller, just trying to help.
eBay Motors: 1989 GEO TRACKER SERVICE REPAIR MANUAL OWNERS BOOK (item 380105917271 end time Mar-23-09 10:06:26 PDT)

[Jasenford]

i looked at your TPS site a few hours ago and i couldnt really comprehend what i needed to do, i dont know why, i just... i seen there was a test were the car does not have to be on but you can uplug the sensor... would there be way you can tell me what to do in a more understandable way lol sry

[Jasenford]

i looked at you TPS site a few hours ago and i couldnt really comprehend what i needed to do, i dont know why, i just... i seen there was a test were the car does not have to be on but you can uplug the sensor... would there be way you can tell me what to do in a more understandable way lol sry

[jtgh]

the buttery fly sets the the min. air flow. at Idle.
it is set at the factory.
the tps is then set with the preload mentioned.

http://carfix.stufftoread.com/TPS/TPS-p92.jpg

note top data box , one is feeler gauge 0.008 and the 0.016" go nogo is the procedure.
the purpose of all this is to get the TPS switch to close every single time the throttle is dropped to idle, ( if not the ECU autmatic idle never wakes up, and stays dead , no idle controls)
to do this and not have the idle fail every other time.
they preload it. ( diff. from 0.008 and 0.016)
they place a 8 thou feeler guage in the stop screw, boss juncture. per my photo above.
then adjust the tps, so the switch just barely closes (reading less than 500 ohms)
typ, is 50 ohms. (need resistance meter , ohm meter to do it)
then you lock the screw down on the TPS base.
then you insert the 0.016 feeler gauge in the same point and make sure the
switch goes to infinity.
(TPS is UNPLUGGEd, during all adjustments of TPS)
if the switch fails to open,at 16 thou, then you set the tsp wrong at step 1, you over corrected.

if you set the tps to open too far in the throttle angle , a flat spot will happen
in the transistion to off idle. ( that is because you might be exiting Idle at 2000 rpm and that would be bad, "IAC hunting results")

now, since you modified the idle stop screw, you now have to do 2 things at once.
not easy.
set the idle, to the proper 800 rpm with this stop screw , HOT.
while keeping the TPS switch closed.
The duty cycle set up does that. setting the duty cycle , gets the IAC valve in the
center of its range.
so it can lower or increase idle as the need arises.

You could follow this path:
1: short the TPS switch pins, some way. (perm. idle)
2: set idle hot. 800rpm , accessories off.
3; set Duty cycle per book.
4: calibrate TPS switch as shown above and above link.

5 : test IDLE by , throwing on head lights, fan, defrost (not A/C).
if idle holds at 800, then iAC idle controls are working. Trumpets!

6: turn on A/C note 1000 RPM.


hope that clears up an complex subject.