Ok my 2.8 non quat is giving off codes p0491 and p0492 something about the air on bank 1 and 2. i was thinking 02 sensor but they were replaced around a year ago so im not sure. any help is always appreciated.

 

ok today i filled up my tank and put a can of seafoam in the tank and the car threw code p0441, some thing about evap purge. the guy at the auto parts shop said its out of the gas capp isnt holding the pressure or the maf sensor has a vacum tube thats cracked does any of this make sense? also any help on the p0491 and p0492 is greatly appreciated.

 

Can you check the touble codes again? P0491 and P0492 do not exist. Anyways, if you are referring to the secondary air injection flow too low, which are either P1411 and P1423, I would first check the vacuum line to the combi valves which are located at the rear of each cylinder head. They have shiny silver top and each has one vacuum line going in. Follow the vacuum line and see if there is any leak. As for the P0441 you might have over filled the gas with including the seafoam. Just run the car for awhile and see if it disappears. Otherwise you have something going on with your evaporative purge system, which may mean the line is either leaking or one of the valves are not working properly.

 

thank you very much but where would i find my purge system.

 

It is a long chain of hoses from the engine bay to the rear and then back. You should have a sticker under the hood, but here is one for your viewing pleasure.



Basically, the EVAP purge valve (N80 valve) is located above the air cleaner housing and you follow the line all the way back to the rear of the car.

 

Fault codes P0491 and P0492 are for Secondary Air Injection System Insufficient Flow, Bank 1 and 2. Because you have both codes as a same time, i would check from the source first (Air pump and vacuum lines from intake manifold). Common causes are broken vacuum hose, broken vacuum T (most common), faulty air pump.

 

YOU GUYS ARE THE BEST! i havebt been near a computer so it takes a while for me to respond