Loss of power while towing!

bpan · Aug 23, 2017

I need a bit of help, Im on vacation right now having a problem with my truck loosing power. Out of nowhere the truck will loose all power. Boost is good, i can downshift fine but still has no power. No smoke, trans seems to be holding. When I stop and shut the truck off it goes away, but will come back again. It seems like its not fueling enough. My rail pressure is fine. List of mods below.
GH tune
Streetmax R
Dual Fuelers

Thanks guys!

Spatel23 · Aug 23, 2017

Filters good ?

bpan · Aug 23, 2017

Spatel23 said:
Filters good ?

I believe they should be fine. They have been changed recently. Also the fact that once I restart it runs fine.

Another thing to add: If put to the floor usually my pulse width hits ~1300, when the problem occurs it is not that high. More like 700. I have been running this tune for roughly a year without problems, I doubt it is the tune thats doing this.

PDT1081 · Aug 23, 2017

bpan said:
I believe they should be fine. They have been changed recently. Also the fact that once I restart it runs fine.

Another thing to add: If put to the floor usually my pulse width hits ~1300, when the problem occurs it is not that high. More like 700. I have been running this tune for roughly a year without problems, I doubt it is the tune thats doing this.

Can you monitor your low pressure fuel system?

bpan · Aug 23, 2017

PDT1081 said:
Can you monitor your low pressure fuel system?

I dont think my MiniMax has that capability or maybe it does? My scanner does not come with me on holidays usually haha, maybe it should.

Sterling6.7 · Aug 23, 2017

Is it worth reloading the tune?

bpan · Aug 23, 2017

Sterling6.7 said:
Is it worth reloading the tune?

I tried that too. Didnt seem to make a difference. The problem went away but came right back.

JRLott · Aug 24, 2017

EGT defuel?

Spatel23 · Aug 24, 2017

bpan said:
I believe they should be fine. They have been changed recently. Also the fact that once I restart it runs fine.

Another thing to add: If put to the floor usually my pulse width hits ~1300, when the problem occurs it is not that high. More like 700. I have been running this tune for roughly a year without problems, I doubt it is the tune thats doing this.

Id guess low pressure fuel pump is taking a dump.
Key on Engine Off does it sound normal ?

dsmracing1 · Aug 24, 2017

No DTC's? Something de fuelling from one of the mini maxx settings? Is your Injection pump pressure going down when this occurs?

bpan · Aug 24, 2017

dsmracing1 said:
No DTC's? Something de fuelling from one of the mini maxx settings? Is your Injection pump pressure going down when this occurs?

My pump pressure seems normal to me. Its definately not the minimax defueling. Ill check the key on if the low pressure pump runs normally. No DTCs yet. Its only happened 3 times though.

dsmracing1 · Aug 24, 2017

bpan said:
My pump pressure seems normal to me. Its definately not the minimax defueling. Ill check the key on if the low pressure pump runs normally. No DTCs yet. Its only happened 3 times though.

Right on, hopefully you find something!

bigrpowr · Aug 24, 2017

fuel temps will put it into limp and throw no codes.

dsmracing1 · Aug 25, 2017

Entirely possible with a dual fueler setup too! 1/4 tank is empty. That's the standard I follow with running dual fuelers...

bigrpowr · Aug 25, 2017

dsmracing1 said:
Entirely possible with a dual fueler setup too! 1/4 tank is empty. That's the standard I follow with running dual fuelers...

i got the h&s low pressure and it never happened again.

bpan · Aug 26, 2017

bigrpowr said:
fuel temps will put it into limp and throw no codes.

Does anything tell you that the truck has gone into limp mode? I am leaning towards this answer, as the truck was running pretty hot all day. Roughly 230 degree F oil temp. Coolant stayed a little lower.

On another note we drove back today with no problems. Is was a fair amount cooler outside and the truck stayed cooler too.

bigrpowr · Aug 27, 2017

bpan said:
Does anything tell you that the truck has gone into limp mode? I am leaning towards this answer, as the truck was running pretty hot all day. Roughly 230 degree F oil temp. Coolant stayed a little lower.

On another note we drove back today with no problems. Is was a fair amount cooler outside and the truck stayed cooler too.

nope ! maybe you can watch fuel temps, iirc it will limp at 160* or so .

Jomax · Aug 29, 2017

bigrpowr said:
nope ! maybe you can watch fuel temps, iirc it will limp at 160* or so .

What's the normal operating fuel temp for these trucks?

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bpan · Aug 31, 2017

bigrpowr said:
nope ! maybe you can watch fuel temps, iirc it will limp at 160* or so .

Ill do that next time Im towing. Thanks for the help.

bigrpowr · Aug 31, 2017

bpan said:
Ill do that next time Im towing. Thanks for the help.

when it happened to me , multiple times before i got the h&s low pressure system, the first time i replaced the fuel pump ( stupid ) and 2nd time i just disconnected the fuel temp sensor until i could get fuel.