I tried a 07, 08, brand new 2011 tbss TB's and now have a brand new LS2 TB and still have the same issue, it will only give me 40% throttle with the pedal to the floor, doesn't do it all the time though, sometimes i can put it in neutral and key off and then fire back up and its good, other times i have to let it sit and cool off.... its real cool when it happens at the track lol. The pids for TPS 1 and 2 show 40% at the TB but 100% at the pedal APP sensors??

 

Have you contacted Torque Rush to see if he knows of any other ideas? Then using the LS2 TB did you cut the 2 looped pink wires in the harness ?

 

yeah cut the loops and heat shrinked the ends, i've talked to him, i need to get him some screen shots/log files to help out but i haven't been able to drive the truck lately...

 

I used an ls2 tb and had no issues with mine. Been using it for about 500 miles.

 

I have had numerous issues. There are tables that need to be changed in your tune if you are having the part throttle REP mode. If you are getting the P1516 because the blade is binding, it will also get it if the engine is off. Turn the key to on, engine off, and floor it. It should open freely without binding or tripping a code. I have to use an 87 mm truck throttle body on mine or I will get REP. I have a new LS7 throttle body I get REP whenever the RPM's get higher and it starts moving some serious air. I really wanted that 3mm too. Lol

 

LOL

I don't have time to get on here very often these days.

The first thing anyone with throttle problems should do is go through this troubleshooting document: Torque Rush LS2, LS7, LS3 to LS1 throttle body adapter harness

It is important to know what DTCs are triggering REP mode as there are many possible causes. If you are getting a P0220 alone, you should check out the X-Link. TPS2 will be out of range or not sync'd with TPS1 if something has happened to an X-Link. But this can also happen with a ground problem or low system voltage.

The most problems I see are after engine swaps. Make sure the engine harness ground is securely attached to the top, right, rear of the engine block and that the wire and terminal are in good condition.

P1516 is a commanded vs actual throttle position correlation issue. Commanded is a combination of pedal position and the tune. Anything that prevents the blade from reaching the target position will set a P1516. Grounds, system voltage and battery condition should also be checked.

It is important to note at what throttle position P1516 occurs.

I had 1 TB sent to me for a P1516 and I didn't notice a small bur of aluminum between the blade and throttle bore until I took a photo and viewed if on a monitor. The drag on the blade was cured by cleaning this up and no more P1516. I have also seen ported TBs where the blade was not perfectly centered when reinstalled and was rubbing at some point in its travel.

Using a gold blade TB with an X-Link 2.1 that has had the pink wire loops cut will set a P1516 at WOT because the blade will hit the stop before 100% TP voltage is reached. This could also happen with an oddball TB where the sensor alignment was off slightly. A possible cure would be to reduce the max throttle % in the tune by a few % as the blade will be trying to go past actual 100% when set to 100%.

Please leave a message or shoot me an email if you can't get through to me by phone. I always return calls or messages the same day, unless I am somewhere out of phone range. I will not see PMs unless I happen to log in as PT.net does not send notifications.

 

Lucky for me i work at a Cadillac dealer so I was able to sweet talk to parts manager into letting me pull a brand new TB off the shelf and plug into my truck. With the key on engine off I hit the throttle about 6 times to the floor and no REP. I thought that was it. On the 7th try it set the REP. I reset the 1516 code and about every one to three WOT hits I made it set the code again. I talked to my tuner again and he said that there was not a lot he could do in the tune to fix this. He could only mask the problem by reducing the throttle travel. I know there is a TSB out there to reset the timing of the gears in the TB so I am going to try that next unless anyone else has a better idea. I was also thinking of trying to improve the ground circuits going to the TB. Has anyone had any luck with that?

 

Do you know what the TP Sensor voltage values are when the 1516 is set? The TAC module typically considers 3.8 to 3.9V as 100% and stops there. If it can't reach this and the tune is commanding 100%, it will keep pushing until either it does or a P1516 sets. Are you seeing exactly 5.0V on the 5V ref pins of the factory throttle connector?

The throttle grounds are from the TAC module which is grounded/spliced with the rest of the grounds inside the engine harness and connected to the block.

 

Dr X, thanks for that info. I will check those values in the morning. I will post what I find. Thanks again for all your help with this issue.

 

Subscribing to see the outcome. I am pleased with my X-link / LS3 Tb combo.