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atlantaman

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

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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?????

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

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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???

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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.

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Total weirdness has occurred

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

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

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

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