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  #1  
Old 11-29-2010, 03:48 PM
phantom1818 phantom1818 is offline
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Default throttle postion sensor help

i need some info on how to test a tps. I ran the codes on my 89 bronco 2 and i got code 63 should i just replace the sensor or is there a way to test it before i go out and buy another sensor
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Old 11-29-2010, 03:57 PM
Psychopete Psychopete is offline
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Default Re: throttle postion sensor help

Yes, it's actually really easy. The TPS sensor is pretty much a potentiometer. Testing it, you want to use the ground at the plug. Sneak the meter leads along the wire into the back of the plug. Best to use an analog meter for best results.

3 wires; one is constant 5 volts, one is ground, and the other is the signal to the computer (test with key on engine off). The voltage increases as accelerator is applied.

What you want to watch for is how the meter sweeps with the throttle body - any dead spots indicates a bad sensor and the analog meter should sweep smoothly with the TPS sensor. You will have to remove the shroud over the throttle cable to access the throttle lever. Typically you see around .98 volts at idle, and high 4.xx at WOT.

Don't mess with the TB screw! That is not a manual idle, but it sets the base voltage for the TPS sensor. The computer controls the idle speed.

This site has a lot of info that can help you test sensors and diagnose problems - link to the TPS section:

http://www.fordfuelinjection.com/?p=30
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Old 01-29-2011, 12:17 PM
olblue88 olblue88 is offline
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Default Re: throttle postion sensor help

my buddy turned that to adjust the idol lol, soooo now what? it still wants to die when i come to a stop but notall the time. i had it idoling perfectly in the garage lastnite for 30 mins took it down the road and the first stop sign it was idling low so i hadto rev it a tad to keep the r's up any ideaS???????????????????/

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it was running the same before he messed with that "idle screw" lol
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Old 01-31-2011, 06:40 AM
Psychopete Psychopete is offline
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Default Re: throttle postion sensor help

Dirt/carbon build up around the throttle body plate can cause these issues. Did you get a chance to test the TPS and pull trouble codes from the computer?

There's a procedure to reset that screw to where it needs to be, but I don't know it off of the top of my head.
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Old 01-31-2011, 08:05 AM
olblue88 olblue88 is offline
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Default Re: throttle postion sensor help

i havent had time to yet, i wish i could get that screw back where it needs to be id feel better
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Old 01-31-2011, 10:54 AM
olblue88 olblue88 is offline
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Default Re: throttle postion sensor help

my volt meter died when i went to use it today. i unpluged the tps and it idled rough but smoothed out some and stayed running is that normal? any ideas on how to get that screw to factory spec? thats buggin the crap outta me
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Old 08-11-2011, 05:23 PM
hogstar hogstar is offline
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Default Re: throttle postion sensor help

Before you replace the TPS, Take a look at my post 1986 missing and bucking--solved???
It might be worn throttle cable links, this causes the throttle plate to wiggle with the engine vacuum and the TPS sends bad signals to the PCM(computer).

Good luck.

gil
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