Throttle Body

[BigSilver]

2003 Chevy Suburban 2500, 6L

 

Can some one please tell me where the throttle position sensor is to be found on this model of vehicle?

 

Attached are photos of my throttle body.

 

Thanks.

[Mike G]

I am by no means and expert or vaguely familiar with the TB unit, but my guess would be to say the large black plastic unit on the left side of the TB.

--Mike

[BigSilver]

Thanks for your input Mike. I am guessing the same thing, though was hoping to find out it might be squirreled away in the engine bay.

 

The Suburban has over 200,000kms on it, so I opted to change the throttle body and the accelerator's pedal sensor, after having numerous P1125 codes shoot the life out of my Suburban while driving.

 

Followed by a PCM flush, by disconnecting the battery for 30 mins., the Suburban still suffers from P1125.

 

Any suggestions, except for seeing a dealership, would be appreciated.

[L29er]

I don`t know the definition of your code but assuming its for you throttle control, WELL i have experienced many preblems with vital wires rubbing through on higher mileage trucks right in the loom, i`d say pull all the wires out right from the throttle control to the ECM, most commonly i found them close to the TB or on top of the engine...Don`t get to afraid seing a horendous amount of wires come out of the loom, there is alot in there! Give them a very good look over, most common places to find bad spots is in bends or were the loom is held down by the strap clips.....>stump

[BigSilver]

Being handy with electronics, the sight of wires doesn't faze me much. Your suggestion is something I had not considered. If the wires were constantly being flexed, as within a door and body wire loom, then I would have given it a thought.

 

Wires on top of an engine always appear stationary, but perhaps extended vibration, or a potential pinch point, as you say, may be the cause of the failure.

 

To splice in a new set of TB wires in parallel with the old ones, would be worth investigating to determine TB performance. This process would eliminate much of the guess work with evaluating the internal condition of the copper strands within the vinyl casing.

 

Good thinking Stump, thank you.

[BigSilver]

Update:

 

I checked through the wiring and found zip. No kinks or binds.

 

What I also did was, by the suggestion of a master mechanic, is change the spark plugs. The problem code has since disappeared, like magic.

 

Who would have thought that faulty SP's would initiate a P1125.

 

Oh, and those spark plugs looked like the following: