2015 SHO 3.5 MAP sensors

[Reverb]

Having P0171 and P0174 codes. Have replaced O2 sensor at Bank 1 sensor 2 originally and also PCV. Have cleaned IAT and both MAP sensors. Originally was just Bank 1 lean P2270. Now both banks. Have not detected any vacuum leaks. Was wanting to know what voltages I should be seeing at MAP sensors both with engine running and with just power. Thanks

 

[kryptto]

Pinpoint tests for both MIL

 

[Reverb]

Pinpoint tests for both MIL

Thank you kryptto for the download. I have just purchased a wireless OBDII tool and have ForScan Lite. I will attempt these procedures and report back. Again, thank you

 

[kryptto]

Thank you kryptto for the download. I have just purchased a wireless OBDII tool and have ForScan Lite. I will attempt these procedures and report back. Again, thank you

My 2 cents, get a spray bottle fill with distilled water, and a drop of dawn/palmolive whatever makes bubbles, and spray down all hoses looking for signs of vaccum leaks. You don't say how many miles, if you are around 100K anything can develop cracks and dry rot. get someone to lightly rev the engine, or if you have a peddle depressor use that with 2k rpm and spray down the hoses. get MAP sensor cleaner CRC - from advance auto or similar, clean them down, there are 2 - 1 on top of the intake and the other on the hard pipe in front of the TB down to the IC. depending on mileage and cost to replace the O2's, replacement might be a good thing at this point too.

 

[BradM]

My 2 cents, get a spray bottle fill with distilled water, and a drop of dawn/palmolive whatever makes bubbles, and spray down all hoses looking for signs of vaccum leaks. You don't say how many miles, if you are around 100K anything can develop cracks and dry rot. get someone to lightly rev the engine, or if you have a peddle depressor use that with 2k rpm and spray down the hoses. get MAP sensor cleaner CRC - from advance auto or similar, clean them down, there are 2 - 1 on top of the intake and the other on the hard pipe in front of the TB down to the IC. depending on mileage and cost to replace the O2's, replacement might be a good thing at this point too.

Soapy water won't produce bubbles when looking for vacuum leaks

 

[kryptto]

Soapy water won't produce bubbles when looking for vacuum leaks

HA! Not using any excuses - the fog of this cold i have truly is getting to me. So true. I do have a tendency to type before thinking. Time to seriously inspect those vacuum lines.

 

[BradM]

HA! Not using any excuses - the fog of this cold i have truly is getting to me. So true. I do have a tendency to type before thinking. Time to seriously inspect those vacuum lines.

Maybe you were looking for bubbles from inside the intake.

 

[Reverb]

Right at 98k. I have cleaned all MAP sensors with MAP cleaner and have also sprayed BrakeKleen around all hoses with no changes. I’ll find it. Good news is it doesn’t seem to affect performance at all.