silvy13

Can a bad tune cause reduce engine power? The reason why I ask is because I have changed out tb, xlink,check all ground ,gas pedal sensor and im still getting this maybe twice a day .i disconnect the maf sensor and truck ran a little better but still had the problem . Another reason why i ask is because i got a free tune and everytime i get a retune they are free. I would like some help before i go get another tune by someone else and end up with the same problem

1FastBrick

iTrader: (17)

If you change the wrong parameters then Yes, a Tune that was not done correctly could cause that issue.

Jason Z69

^^^^^ i agree with 1 FastBrick. It could be ypur problem. Do u have any way to do a log while the reduced power is going on. Or can u duplicate anything and make it go into reduced power mode

silvy13

I dont have no way of checking thats the issue.i dont wanna spend money on a tune if it keeps doing this

1FastBrick

iTrader: (17)

Have you checked the wiring from The Throttle body to the ECU? Its very common for it to become brittle and break there. There is even a TSB reference this for Gm service techs.

silvy13

Ima have to check that out ..like today i noticed that with my ac on it wouldnt idle right and surge when i got to a stop sign ..rpm was jumping from 900-300

1FastBrick

iTrader: (17)

It would also help to know what code you're getting.

silvy13

P1516 Po120 Po121 Po122 theses were the codes i got when it started to do it about 6 months ago but now not even my cel comes on it just goes to REP

DrX

iTrader: (7)

The codes may have been disabled in the tune, but that will only stop the CEL from lighting up and the codes from being reported. REP mode will still be triggered if there is any problem with the throttle control system. I would ensure that all throttle related codes are being reported in order to aid in diagnosis. We need to know what DTCs are triggering REP now. They could be different now that you have changed parts.

silvy13

stopped by a oreilly on the way from work and theses were the codes they gave me
p0068,p0113,p0102