Well Im back again! I am having trouble with my 01 blazer 4x4. It is bogging horribly while driving, it sounds like a carburated motor does without the airfilter housing installed. I ran the codes and found that it was throwing a p404 and a p101 code. I then replaced the EGR valve and the MAF sensor and the problem is still there. I checked to see if I possibly had a broken wire and found none? The truck is still throwing the Mass air sensor code so Im not sure where to go from here? Any light you can shead would be appreciated.

Ken

 

Is there a relay that I could check or possibly another sensor that would throw those codes?

 

P0404 - Exhaust Gas Recirculation Control Circuit Range/Performance
P0101 - Mass Air Flow System Performance

I would have checked to make sure that you don't have any vacuum lines off anywhere before replacing those parts. A large vacuum leak could cause a P0101 & P0404. And as described above, you are noticing an increase in the noise level of the engine.

Also, you have the ability to edit your posts to include anything you may have forgotten. Please do not post numerous times in a row. If someone has posted, then feel free to create a new post, but unless someone has replied, please edit your last post to include the new information/questions that you may have forgotten to include originally. Thank you.

 

Sorry about the multiple posts...I forgot about the edit option.

I will check into the vacuum leak posibility. I have already replaced the EGR valve and the MAF sensor so I am sure they aren't the problem.