Well, the original poster has the Ecoboost engine. When they go into limp mode, it's to save itself. May or may not leave a code. The system is just doing what it was meant to do in that condition.
Boost is a great thing for producing a lot of power on these little 3.5L V6 engines.. 365 hp and 430 tq.. Not too bad...
But, the cost is you can't just keep 15 psi of boost for endless amounts of time. 2-3 minutes, sure, but it'll get dang hot in that short time!
Let off and it cools down pretty quick.
Just sticking the thing in D and setting T/H mode and then just bombing up the grades or trying to keep "the speed limit" and letting it run in 6th gear doing will will put that boost level over 10 psi and that's where the coolers can't keep up for any length of time.
I've been towing with my Eco for over 6 years now and from day one and there is a learning curve to being able to run these things well..
Once you start monitoring the actual temps and other monitors that are not on the dashboard, you find out real quick that boost = heat and the longer you have that boost > 10psi, the temps rise quick.
Then Ford does not let the temp gauge actually MOVE until you are getting to 240* at least.. I think limp mode comes in around 250*.
I have gotten to 230* monitoring my coolant temp and the dash gauge has never moved. Trans temps have never gotten over 215*. Let off the gas either on the down side of the grade, or just gear down to lower boost and slow down a bit, the temps start to go down pretty quick.
I lock out 6th gear going on the flats. I have 3.73 gears and 5th will hold a nice speed of 65 mph at around 22-2300 rpms and around 2-3psi of boost. Temps hold steady at around 205*. Will move up to around 210* if the boost gets to 6-7psi and once over 10psi, 220* comes pretty fast.
The electric fans turn on at 213* on low and will go to high at 225*
This is all my using the + - button on the gear shift and running the gears to keep the engine in a nice 2000-4000 rpm range.
Up the grades, I like to hold it in 4th, pulling just under 3000 rpms and around 50-55 mph.
I still have a ton of pedal left, and can go 70 mph if I had or wanted too... But, the cost would be lots of heat really fast and to get to the top of the hill a minute or so quicker??
Anyway, just my experience with it.. I know I'll get ripped on this, so be it.. To answer the question of my cooling system, I have changed the coolant 2 times now and change my engine oil every 4-5000 miles at most. I've also changed the trans fluid 2 times and I have over 103,000 miles on the Eco right now. It's just that the cooling system does NOT have enough capacity to handle it all... It's actually 2 gallons less cap then my old 97 F150 with the 5.4 had...:)
It's what works for me and I know my truck and I know my comfort zone and I've never been in limp mode or stuck on the side of the road... (knocking on my wooden head right now) ๐
Good luck! Mitch
Boost is a great thing for producing a lot of power on these little 3.5L V6 engines.. 365 hp and 430 tq.. Not too bad...
But, the cost is you can't just keep 15 psi of boost for endless amounts of time. 2-3 minutes, sure, but it'll get dang hot in that short time!
Let off and it cools down pretty quick.
Just sticking the thing in D and setting T/H mode and then just bombing up the grades or trying to keep "the speed limit" and letting it run in 6th gear doing will will put that boost level over 10 psi and that's where the coolers can't keep up for any length of time.
I've been towing with my Eco for over 6 years now and from day one and there is a learning curve to being able to run these things well..
Once you start monitoring the actual temps and other monitors that are not on the dashboard, you find out real quick that boost = heat and the longer you have that boost > 10psi, the temps rise quick.
Then Ford does not let the temp gauge actually MOVE until you are getting to 240* at least.. I think limp mode comes in around 250*.
I have gotten to 230* monitoring my coolant temp and the dash gauge has never moved. Trans temps have never gotten over 215*. Let off the gas either on the down side of the grade, or just gear down to lower boost and slow down a bit, the temps start to go down pretty quick.
I lock out 6th gear going on the flats. I have 3.73 gears and 5th will hold a nice speed of 65 mph at around 22-2300 rpms and around 2-3psi of boost. Temps hold steady at around 205*. Will move up to around 210* if the boost gets to 6-7psi and once over 10psi, 220* comes pretty fast.
The electric fans turn on at 213* on low and will go to high at 225*
This is all my using the + - button on the gear shift and running the gears to keep the engine in a nice 2000-4000 rpm range.
Up the grades, I like to hold it in 4th, pulling just under 3000 rpms and around 50-55 mph.
I still have a ton of pedal left, and can go 70 mph if I had or wanted too... But, the cost would be lots of heat really fast and to get to the top of the hill a minute or so quicker??
Anyway, just my experience with it.. I know I'll get ripped on this, so be it.. To answer the question of my cooling system, I have changed the coolant 2 times now and change my engine oil every 4-5000 miles at most. I've also changed the trans fluid 2 times and I have over 103,000 miles on the Eco right now. It's just that the cooling system does NOT have enough capacity to handle it all... It's actually 2 gallons less cap then my old 97 F150 with the 5.4 had...:)
It's what works for me and I know my truck and I know my comfort zone and I've never been in limp mode or stuck on the side of the road... (knocking on my wooden head right now) ๐
Good luck! Mitch
