What are your idling RPMs?

Just curious. Mine are around 900.

 

Just under 600 rpm in D or 750 in P when it's warmed up.

 

2013 TRD SPORT 4X4 4 Ltr.

Idle 650-700 rpm

TOMB

 

900 even with AC on is a tad high.

Consider a throttle and maf clean with a battery disconnect at the end.

 

500-700rpm. On idle in drive or park.

If you are experiencing 900rpm is quite high. sounds like you may want to clean your butterfly valve.

 

OP try this first,
and it’s the first thing to do to fix high or rough idling. Takes 2 minutes.
https://m.youtube.com/watch?v=x2YNC_CMbC0&pp=ygUXVGFjb21haG9saWMgcm91Z2ggc3RhcnQ=

 

I have P0101 even after replacing the MAF sensor. At the time I got the code, the MAF rate was around 4 lb/min @ around 2100 RPM.

 

do you think that may be related to P0101, MAF sensor ?

 

This

 

Possibly. I would start with the easiest and cheapest troubleshooting then work my way up from there.

Check the following:

Inlet to the Air filter box ensure no clogs or debris. That’s under the fender.

Air filter, ensure no debris or clogged filter.

If all is good above.
Do the following:
Clean MAF sensor
Clean throttle plate.
check intake pipes for clogs.

If problem still occurs, you may have a failed MAF sensor.
I’m not sure if loose or failing timing chain would cause high idle RPM? Guys?

 

it's definitely not the sensor

 

Clean the throttle body first.
That code is set based on voltage seen at the ECU while idling or below 2,000 rpm.
An open or short in the wiring or connection could cause the code too.

 

the p0101 ? i was at 2200 RPM at the time the code went off

 

Is that what freeze frame said?

 

yes sir. actually 2100 and change, sorry

 

Are you running an aftermarket air intake? If so that could be your P0101 problem.

 

Good question.
His LT fuel trims are high 20%, and ST are near perfect @ 2100 rpm.

 

No, the original the truck came with

 

And is the MAF sensor OEM?
P0101 is a rationality code, it essentially means the actual mass airflow doesn't match the calculated mass airflow.
What is the MAF reading at a hot idle?

 

Hey just occurred to me.
Spark plugs?