I have had my car at the dealership about 6 times now for the P0171 crap. Just recently, it threw a P1133 (H02S11 insufficient switching) but i think thats cuz i ran 104 in it 4 days previous....

The car is a 2005 and has an Air box mod and Solid mounts.

I have done a lot of reading about Map sensors and TPS sensors getting loose but the SC was just off to have the silencer holes plugged and the TPS went in just fine.
The car was also going into limp BEFORE the SC came off

Back in Arizona, a chevy dealership said there was a TSB for re-calibrating the MAF sensor so thats what they did and I didnt have a problem for 3 months.

It goes into limp mode on 3rd gear and above 5000 rpm, and after, it has an eratic idle. I let it cool for about 10 minutes, and the car starts just fine again, no DTCs.

I have my interceptor gauge coming tomorrow so I hope that will help.

Also, some guys were talking about the TB getting caught but only when it snaps shut? Is this a possibility?

My dad and I changed the fuel filter too, so thats not the issue. I just cant understand why it keeps getting so lean and why it will randomly go into limp when I mash on the gas. This is the first time I saw ENG PWR REDUCED in about 3 months.

Any Ideas? Thanks

 

Well it did it again when I was driving home. This time, I hit a bump while in 3rd gear and a second later went into limp mode. Im thinking its a loose sensor. I pulled over at a gas station and let it cool to restart it......It had a DTC. But this morning, started fine, no DTCs. Can the Interceptor gauge pull up previous DTCs?

 

I'm pretty sure the interceptor cannot pull up old DTCs. Take it to Autozone, theirs can.

 

Yeah I would take it to the dealership, but every time Im in there they say they cant figure out whats wrong because the codes are no longer present

 

here's some suggestions on things they can check. barometer/map sensor. if you have a CAI check your maf to make sure no oil has built up on it. and your knock sensors will cause this as well. those are just some starting points.

 

check the throttle body connector...

 

Throttle body connector? Is that just the purple one underneath the TB housing? I took it off inspected it and re connected it, however...

I did find a crispy dead bug underneath the lock in clip, could that have caused anything? I mean this this was on there GOOD when I first pulled it off.

Also, can the interceptor pull up MAP readings?

 

Check to make sure your intercooler pump is working,also is your plastic air deflector still attached to the rad underneath.
The car will go into limp mode I think I read if your air temps in the intake get to high.
In Arizona that would only take a few high rpm pulls to get those temps up.
When I get home I will see if I can find the info on what causes limp mode other than abuse.

Found what I was looking for.

Supercharger boost pressure is regulated to prevent engine and drive train damage. When the engine is operating under high boost conditions, the powertrain control module (PCM) limits boost pressure to 83 kPa (12 psi). The PCM disables boost under the following conditions:
• When reverse gear is selected
• When the engine coolant temperature (ECT) is excessively high
• When drivetrain abuse is detected
• When the vehicle is decelerating
• If an intercooler pump failure is detected
• If the intake air temperature (IAT) sensor 2 becomes excessively high
• Under heavy load in first and second gear at engine speeds above 5,800 RPM

Heres some more

Reduced Engine Power Mode
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:

• Acceleration limiting--The PCM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.

• Limited throttle mode--The PCM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.

• Throttle default mode--The PCM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.

• Forced idle mode--The PCM will perform the following actions:

- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF.

- Ignore the accelerator pedal input.

• Engine shutdown mode--The PCM will disable fuel and de-energize the throttle actuator.

 

Nice find!!! Im not in AZ anymore im back up in MN lol. And the car did it within 2 minutes of a cold start up. How do I check to see if the pump is working?

 

You could start the car and feel if the pump is running with your hand,Its actually pretty close to the front end under just past the rad.Follow the hoses they lead to the pump.

You should also see some turbulance in the coolant looking through the filler spout for the intercooler.

 

But wouldnt a problem with the pump set a code?