Vacuum Leak P0106

[Terminator]

Hello,

For the record I searched, didnt find specifics on this. My 2006 LS is throwing code P0106 Manifold Absolute Pressure AKA a Vacuum Leak. Here is the thing. I recently replaced all coil packs and spark plugs, air filter, oil chage, etc. The car runs and idles FLAWLESS, no lean bank codes either. Ive found vacuum leaks in the past when a car idles bad by spraying electronics cleaner around to see where the car smooths out, but how do you locate a vacuum leak on a car the runs perfectly? Any experienced input would be greatly appreciated. Thanks!

 

[joegr]

I would start with the small hard lines that run from the manifold to the EGR valve assembly and the fuel pressure sensor. It's the EGR assembly that reads the manifold vacuum. You might try using a mechanic's stethoscope (about a $5 item) to try and find the leak by sound.

 

[tireman]

DIY smoke machine.

 

[Terminator]

Yea, I got the stethicope. I inspected everything. I can find this supposed vacuum leak. Does this car even have a MAP sensor that could be going bad? Smoke machine was my last resort, I dont want to pay an arm and a leg to have this thing smoked, when it runs flawlessly....HELP!

 

[joegr]

The MAP sensor is a part of the EGR assembly. I have seen the plastic crack on the EGR assembly and cause it to misread vacuum levels, however so far that has resulted in a different code.

 

[Terminator]

UPDATE- The issue was a combo of bad coil packs/Spark plugs, and a bad EGR. Tuned up and replaced EGR, codes are gone.