Why won't my 2004 F-150 4X4 go over 100 MPH
 

Hesitates on take off, accelerates fine when passing but can't seem to get it over 100 MPH

Have you over-ridden the top speed limiter ?

100 mph sounds right, there's a speed limiter in the computer.

The speed limiter is actually set for 95 as I recall. If you buy a programmer, you can set that limit higher. But, it's a truck, not a race car.

- Jack

If you have a code reader that allows you to read contents of ANY custom PID from the ECU by PID# -


You can tell if it is the ECU limiting, or just running out of guts to push the wind.
PID # 095E is "TQ_CNTL" (Torque Control Flag). One byte CODED as follows:


0= No Torque reduction requested
1= Torque Truncation. Cuts fuel to protect when line pressure fails to minimum limit
2= Torque Control Event - cuts fuel and/or spark for traction control.
3= Vehicle Speed Limit - Cuts fuel

Ya I know it'e not a race car, just curious. Truck has around 2200670 miles, but just put a new aftermarket engine in it. Body was in primo shape so I saw no reason to buy a new truck.

2M miles? Wow! Did you possibly mean 220K miles?

Sorry if I sounded like I was being disrespectful - I did not mean to be. I just find people wanting to drive a truck over 100 mph to be a bit on the crazy side.

I DID set my speed limit to 110 when I was using a programmer, so I wouldn't have a cut-out during passing.

- Jack

Passing WHAT --- a Corvette?

I used to own a 2002 F150 4x4 Supercrew, My son the mechanical engineer, showed me the truck was limited to under 100 mph. He bypassed the limiter by clicking on the parking brake one notch, which turned on the dash board brake light, then he ran it up to 120-125.

:surrender: :surrender:
I do a lot of driving on 2-lane roads, and I often find myself coming up on someone doing just a bit slower than I want to do. (I usually drive about 5 mph over the speed limit, when there is not much traffic and I'm familiar with the road). So, when I step on it to pass, the speed goes up pretty rapidly, since I don't like to spend a lot of time in the left lane. I've easily gotten to 90 mph in those instances - so, I like an additional buffer.

But, your point is taken. :bows:

- Jack

Old farts shouldn't be going that fast!😅😂

Hey, I resemble that remark!

That makes 3 of us!😅

I found my limiter the hard way - I was on a 2 lane highway in rural Kansas with a 65 mph limit. Came up behind a gaggle of cars doing about 55, and nobody seemed interested in passing anyone. Got to a long straight stretch with no one visible on the other side, so, down to 3rd, wound it to 80, hit 4th, and at 95 the fuel shut off. This was just as I was abreast of the front car in the gaggle. Feathered the pedal, hit 5th, and moved back over when past that car. The less time you are exposed out on the other side, the better off you are.

I don't remember if I raised the limit on my truck when I installed the Superchips but I do remember raising it to 180mph on my Dodge Magnum Hemi. Top speed from what I've read could be in the 155 to 160mph range. Maybe once I've taken it to 120 or so but usually never go over 10mph over the speed limit. During my misspent youth I took my Chevelle to 140 dozens of time because that's how fast it would run.