2016 5.7 Hemi low acceleration miss

[DaveWoodworker]

Hi,
I have 2016 5.7 Hemi that hesitates on low acceleration. Step her down and she takes off fine.
I just had the engine replaced and the issue continues.
Not throwing codes at all for this.
All new plugs (Iridium)
Replaced 1 faulty ignition coil.
I've run injector cleaner for the last 4 fills.

No difference.

I'm not a mechanic but can't afford to have one go search and see anymore.

 

[Daw14]

.

 

[EdGs]

Did it do this before plugs were changed?

Were the plugs from a reputable source? Lots of counterfeits on Ebay and Amazon, unfortunately.

 

[Wild one]

Hi,
I have 2016 5.7 Hemi that hesitates on low acceleration. Step her down and she takes off fine.
I just had the engine replaced and the issue continues.
Not throwing codes at all for this.
All new plugs (Iridium)
Replaced 1 faulty ignition coil.
I've run injector cleaner for the last 4 fills.

No difference.

I'm not a mechanic but can't afford to have one go search and see anymore.

Couple easy things to do,that don't really cost anything other then a can of throttle body cleaner,and that's remove the throttle body and give it a good cleaning,and the other is to retorque the 10 bolts holding the intake manifold on the engine,they call for 108 in-lbs or 9 ft-lbs of torque.Disconnect the negative battery post,before removing the throttle body to clean,then when you re-install it,reconnect the battery,turn the ignition to run,but don't start the truck,then press the gas pedal to the floor and back up 3 times in a row,turn ignition off,open and close drivers door,then start it and go for a drive.The 3 times to the floor is the poor mans way of doing a throttle body relearn.

 

[Burla]

What cleaner? You run 91 gas? Step one 91 gas. Does is hesitate in tow haul mode?
Clean injectors manually or with redline si-1 high concentration level.

 

[jws123]

Sounds like you could be talking about when MDS kicks in it will hessitate and feel like **** when you hit the gas hence most of us tune it out.

 

[04fxdwgi]

Sounds like you could be talking about when MDS kicks in it will hessitate and feel like **** when you hit the gas hence most of us tune it out.

And sounds like a fart in a rain barrel if you have a low restriction exhaust.

 

[grizzstang]

Could be your MDS as mentioned above. To find out turn it off. There are threads on here how to do that.

Did you use the recommended spark plugs or something else?

 

[Burla]

Check if it is mds by selecting gear ratio manually.

 

[DaveWoodworker]

Did it do this before plugs were changed?

Were the plugs from a reputable source? Lots of counterfeits on Ebay and Amazon, unfortunately.

Yes and Yes

 

[DaveWoodworker]

Check if it is mds by selecting gear ratio manually.

Could be your MDS as mentioned above. To find out turn it off. There are threads on here how to do that. I'll have to try that.

Did you use the recommended spark plugs or something else? Yes

 

[DaveWoodworker]

And sounds like a fart in a rain barrel if you have a low restriction exhaust.

No not the case.