05 Sierra Denali w/ Magnason Supercharger---lean warnings

[atlantaman]

I have an 05 SD with a Magnason Supercharger installed. (102000 miles now)

For the first 2 years and 35000 miles all worked flawlessly but now it is starting to act up regularly and I cant get my finger on the issue.

 

I am getting code alarms for lean readings on multiple fronts

 

p0171

p0151

p0174

p0001

 

I Have replaced all 4 of the o2 sensors and all was good for 1 month but back to 2xper day having to clear the alarms

 

I have used up 2 full cans of ether trying to locate a vacuum leak but nothing was found

 

at this point I am going to replace the intake gaskets and get a replacement CPU (off ebay-with exchange) and try that.

 

Any suggestions or other ideas?????

[Chris]

MAF, bad brake booster diaphragm, intake and throttle body gaskets

[Jennabear]

MAF for sure

[atlantaman]

replaced MAF--no help will replace MAP today too

 

more codes to digest p0332 knock sensor o2 circuit low

 

I am wondering if there is a ground wire or ground loop going on somewhere that is not allowing sensors to work properly???

[Jennabear]

MAP won't help, the MAF is the usual suspect. Since you already replaced it (provided the new one isn't faulty) you should check into vac leaks.

[atlantaman]

Total weirdness has occurred

Replaced MAP and everything suddenly got better. car runs like new, no error codes, and gets 2mpg better mileage................

[Jennabear]

Glad you sorted it out! You probably had a leak around the MAP.

[atlantaman]

Actually the MAP was just malfunctioning--car ran like new after it but there was no sign on a leak anywhere..