All right flat rate mechanic here again and we’re diagnosing a p1101 for airflow volume on this Chevy Malibu which seems to be a pretty common problem. The customer came in and they had already replaced the mass airflow sensor one of my techs diagnosed it and we ended up cleaning the throttle body and putting in a map sensor. The check engine light still came back on so I’m gonna kind to go through what I found and how to check these first. What you really need to do if you’re trying to fix p1101 for the airflow is you’re going to need to smoke the actual boost side of this intake system so basically you’re going to have to block off where the air comes in here and lock it off here and you’re going to want to check for leaks through this uh through the turbo through the intercooler and see if you got any leaks on that air charge side of this whole system there’s any leaks whatsoever it’s going to cause that p1101
we did smoke that we took it up here we actually smoked it through here blocked this off we didn’t find any leaks so that all checked out good and we’ve replaced both the booth sensor and the mass airflow sensor or the map sensor sorry the only sensor we haven’t done is a boost sensor but thus far that seems to check out our right but I’m going to show you what we found um I do have this little deal here wants us to check some some of the perimeters on the scan tool which I have up right now we got our boost pressure sensor fuel trim manifold pressure and mass airflow so um and on here one of the first things it wants you to do is uh we want you to basically compare your boost pressure sensor to your Maps sensor pressure so we can go ahead and do that and you’re going to want to do that with the engine off so we’ll go ahead and shut the engine off and we’ll go to English here so we’ve got pounds and you can see where uh relatively close to win range we got 13.5 and 14.1 so I would consider that acceptable so now we’ll go ahead and start it the next thing he wants us to do is check the mass airflow sensor we should have approximately three grams per second at idle so we’re going to go ahead and check that next we’re going to go ahead and start it up and we’ll change our scan tool to metric so we can read grams per second and looks like we’re at about 2.8 and now this is a new Point 2.4 actually so this is a new mass airflow sensor our idle uh seems like we are idling very low we did do a throttle body cleaning Subscribe to my youtube channel here: https://goo.gl/j1pCfn
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The Flat Rate Mechanic. 26-year ASE Master Automotive Technician and Advanced level ASE certified here to help you save money on your automotive repairs The Flat Rate Mechanic is a participant in the Amazon Influencer Program. Disclaimer: Due to factors beyond the control of The Flat Rate Mechanic, it cannot guarantee against unauthorized modifications of this information or improper use of this information. The Flat Rate Mechanic assumes no liability for property damage or injury incurred as a result of any of the information contained in this automotive repair video. The Flat Rate Mechanic recommends safe practices when working on cars or trucks with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this repair video. Due to factors beyond the control of The Flat Rate Mechanic, no information contained in this automotive repair video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or the information contained.
