BBK TPS problem

[ViperPete]

I installed a used BBK throttle body last night.

Now I cannot get the P0123 code to go away. I have installed the TPS sensor multiple ways and re-set the PCM every time. The TPS sensor is less than 6 months old.

SRT2SLOW suggested that I adjust a screw on the TB and check the voltage of the TPS sensor so that it reads 0.8 Volts. I can find no such screw except the screw on the side of the TB that forces the throttle plate open so many MM.

The TPS sensor has 3 wires. 2 of them read voltage and the third does not

I adjusted that screw about 30% of the way open with the hopes that it would alter the voltage on the TPS but it did not change anything. If someone who has a BBK TB could take a pic of tyne screw i'd appreciate that. I cannot stand having a "check engine light"

Also the truck occasionally misses.

 

[VENOMOUS1 RACING]

The screw is the one that opens blade. It also adjusts TPS and it needs to read .68 with key on engine off. Middle wire is voltage.

 

[VENOMOUS1 RACING]

Use your SCT to delete codes also

 

[ViperPete]

OK so I do use that screw to adjust the voltage. But then what?

If I leave the screw like that it will be open all the time??????

 

[ARRESTmeRed04]

No you loosen the mounting bolts on the tps and it should have some play in it, rotate the tps until you get the correct voltage then tighten it down

 

[ViperPete]

It does not matter how much I set that screw. The voltage does not change.

It reads a steady 4.6 volts.

 

[ViperPete]

No you loosen the mounting bolts on the tps and it should have some play in it, rotate the tps until you get the correct voltage then tighten it down

The TPS sensor does not have play in it. Just 2 holes for small bolts. Nothing else.

 

[ARRESTmeRed04]

It does not matter how much I set that screw. The voltage does not change.

It reads a steady 4.6 volts.

Then either the tps is installed incorrectly or it's faulty, also the "play" with the mounting bolts loose is not much, maybe a few thousands of an inch

 

[ZCx]

high voltage shows an open circuit.

did ya ohm out the TPS???

 

[SRT2SLOW]

It does not matter how much I set that screw. The voltage does not change.

It reads a steady 4.6 volts.

you got that thing on backwards if your reading 4.6 volts when closed

 

[hawk02]

Not sure if this will help show position:dontknow:Hopefully a little help bud.....

 

[SRT2SLOW]

https://www.youtube.com/watch?v=3nxzlaq90Vs&feature=youtube_gdata_player

 

[hawk02]

Nice E!!!!!!!!!!!!!!!!!

 

[VENOMOUS1 RACING]

Voltage is adjusted with set screw, not rotating TPS cause it doesn't move enough. So you are opening/closing throttle blade which also changes TPS voltage. It should be .68 at idle or key on engine off.
You measure center (brown/tan) wire for voltage. You are reading PCM voltage sent to TPS which is a 5 volt signal. The IAC will compensate for air removed/added through TB. :rock:

 

[VENOMOUS1 RACING]

https://www.youtube.com/watch?v=3nxzlaq90Vs&feature=youtube_gdata_player

Looked like Trainmans truck spinning down the road testing TB? :dontknow:

 

[Trainman]

Looked like Trainmans truck spinning down the road testing TB? :dontknow:

Yep, that's me....good eyes. They used my truck for the linkage model, you can tell it's my truck by the vent in the front fender (fiberglass), that's also my truck (RC) on the dyno but my reading was at about 496 rwhp. Brian Rodgers shot that video of the burnout behind the BBK facility.:rock:

 

[VENOMOUS1 RACING]

Yep, that's me....good eyes. They used my truck for the linkage model, you can tell it's my truck by the vent in the front fender (fiberglass), that's also my truck (RC) on the dyno but my reading was at about 496 rwhp. Brian Rodgers shot that video of the burnout behind the BBK facility.:rock:

Yup the fiberglass fenders caught my attention

 

[Trainman]

Yup the fiberglass fenders caught my attention

And the foglight covers!

 

[ViperPete]

OK.

Could not get the voltage to change no matter how I installed the TPS.

Bought a new TPS. Installed it. Now has the correct voltage and no check engine light.

Now a new issue. As I am driving the truck the RPM stays at 1500 unless I blip the throttle- then it goes to normal 750 RPM.... Then, when initially starting off, the pedal sticks slightly and I have to give it extra effort until it opens the throttle and its quite jerky....

wtf?

 

[VENOMOUS1 RACING]

OK.

Could not get the voltage to change no matter how I installed the TPS.

Bought a new TPS. Installed it. Now has the correct voltage and no check engine light.

Now a new issue. As I am driving the truck the RPM stays at 1500 unless I blip the throttle- then it goes to normal 750 RPM.... Then, when initially starting off, the pedal sticks slightly and I have to give it extra effort until it opens the throttle and its quite jerky....

wtf?

Are cables to TB routed over linkage correctly? You throttle blade could be sticking inside bores. Look for scraping area in bores while opening butterfly. File down that area slightly to clearance or loosen blades and recenter in bores. :burnout: