I've noticed that when coming out of my parking lot after work, it seems as though the RPM's on my rig run high. This is usually under 5mph and stops as soon as I get over that speed and the truck upshifts. Anyone else notice this at low speeds?

I'm running the performance setting w/ all the stock settings(not towing performance). Would adjusting the shift points do anything to change?

Thanks!

 

has the truck warmed up to operating temp before you drive or you just jump in and go? does it do it everytime at <5mph?

 

Hi gschein,

You can't have any effect on something like that with a Micro Tuner.

About the only thing that is actually going to cause *abnormally* high engine rpms at low speeds is if you have an automatic transmission (or clutch) problem - meaning the transmission (or the clutch in a manual) is *slipping.* That has nothing to do with shift points or the Micro Tuner, nor can you use a Micro Tuner to "repair" anything.

What you need to do is proper diagnosis. Are you even sure this is actually *abnormally* high engine rpms? When you first start the vehicle, the idle speed will be hundreds of rpm higher for the first few minutes of operation - it's supposed to be. That also causes the factory mechanical fan to make a lot of noise at low speeds, as those clutch fans tend to engage when not needed and sap a lot of power, making a lot of noise, etc. - one of many reasons why we convert even one of our vehicles to electric cooling fans and free up anther 15 HP & 1-3 mpg.

You first need to determine if this is actually something NEW or not - then you need to determine if this is actually something ABNORMAL or not. This may not even be engine rpms, but may instead just be the factory mechanical fan clutch malfunctioning, as that will make a lot of noise and sound like the engine rpms are higher than they should be.

Make sure you have a tachometer on the truck and that you actually know what the engine rpms are normally from a cold start - you have to know that at a minimum, to be able to identify if this is actually engine rpms to begin with, and if so, if that actually "abnormal," something "new & different," indicating a recent change - which would indicate the possibility of an actual "problem" somewhere.

This could be just the normal result of being in summer heat with a vehicle that has been sitting in the sun (or any hot place), where the fan clutch engages on a "cold" start when it's really not needed, coupled with the normal higher engine rpms that always occur for the first few minutes of operation from a "cold" start, combining to make quite a racket - sounding like higher engine rpms until you get to higher speeds.

Start with working on proper identification & diagnosis. If you can't do that on your own, then get it in to a service department so a pro can have a look at it to see what's actually going on there, and determine if you have a problem or not, and if so, take care of it.

Personally, the first thing I'd check (aside from the obvious, meaning fluid levels - especially automatic transmission fluid level) is just the fan clutch being engaged when not needed and thus making fan noise - which sounds like the engine is turning more rpms than it actually is. It's very common for clutch fans to malfunction and engage when not needed, and that sounds a lot like higher engine rpms to some, especially at lower speeds.

By the way - F-150 automatic transmissions do not shift into 2nd gear at just 5 mph. Even at the lightest throttle positions on the stock factory program, the lowest is about 8 mph. (In our custom tunes we bump that up where it belongs.) You do not have the ability to specifically alter the light-throttle upshift points like that with a 1715 Micro Tuner, that can only be done in a *custom* tune.

I'm sorry that I can't be of much real help to you here, other than to just say what you have described is not something a Micro Tuner can cause, address or "fix."

Good luck & let us know what you find!