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2018 Mazda CX5 intermittent hesitation


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Hi Scotty,


I have a 2018 Mazda CX5 Touring AWD, 72k miles that is giving me some grief.  Owned since new. There are no codes.  What its doing is the following:

Sometimes when I accelerate from a stop (more prominent with AC on) it'll seem to rev up to about 1500 where it'll just hang until I give it quite a bit more gas (about 20-25% more pedal).  There seems to be no rhyme or reason when it'll do it.  So I used my Forscan app to just poke around and noticed at idle my long term fuel trim is at 6% and my short term fuel trim is about 4%.  I also noticed I have misfires - only 1, sometimes 2, but it jumps from cylinder to cylinder.  They seem to happen when the car starts or soon thereafter. I figured maybe a fuel injection issue so I tried a fuel injection cleaner a few weeks ago.  No change.  I then tried the CRC intake valve cleaner figuring since its a GDI engine I probably have carbon buildup on the valves.  That seemed to make a change but it only lasted a couple of days.  I just tried changing the spark plugs - still the same. Also tried cleaning my mass airflow sensor - no change.  I don't suspect a vacuum leak as the car idles super smooth.  Looking for any advice you may have.

Thanks in advance,

1 Answer

What is running a little lean cuz it's adding fuel so I would advise having the fuel injectors pressure cleaned by a mechanic and his machine