Sputtering, total loss of power

[boostmark]

I have a 2015 Roush all stock with a phase 1 blower 670 hp. Never had a problem till yesterday. Driving normal and all of the sudden the wrench shows up and I cant get rpm`s up, like it went into limp mode. I pull over, shut it off, restart and like nothing ever happened, the light goes out and its back to normal. Temps were high 94 outside but as soon as I get home the code reader goes on and no dct`s found and all is normal? any one have any idea what the hell happened? Car has 49k. Stock Roush tune and a catch can on passenger side.

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[beefcake]

Can start off by just checking the spark plugs see how those are and go from there

 

[SheepDog]

I have a 2015 Roush all stock with a phase 1 blower 670 hp. Never had a problem till yesterday. Driving normal and all of the sudden the wrench shows up and I cant get rpm`s up, like it went into limp mode. I pull over, shut it off, restart and like nothing ever happened, the light goes out and its back to normal. Temps were high 94 outside but as soon as I get home the code reader goes on and no dct`s found and all is normal? any one have any idea what the hell happened? Car has 49k. Stock Roush tune and a catch can on passenger side.

I'd be looking for fuel delivery related issues, with what you are describing. I assume the Roush kit is at least using a BAP, and the OEM fuel pump is being "over-driven". 10 years of this can be hard on the pump.

 

[coyote550]

It's likely a fuel issue. A misfire wouldn't cause it to bog down like that and its highly unlikely for half of the sparks and injectors to go bad at once. I'm not sure how Roush manages the extra fuel needed for the blower but there could be a voltage booster for the fuel pump. If there is one I would check on that. Make sure all the wiring is good. Take the fuel pump out and check out the tank. Make sure there are no contamination in the tank. Was the fuel tank full or on the lower side when it happened?

 

[MiamiGT350]

As others mentioned, look into fuel delivery.

Also, I'd look at the throttle body to ensure it's clean, not catching. Each time I've seen them fail, immediate dashboard-wrench and then it's hard to catch a DTC.

 

[robvas]

Also, I'd look at the throttle body to ensure it's clean, not catching. Each time I've seen them fail, immediate dashboard-wrench and then it's hard to catch a DTC.

I'd start here, maybe a sensor or wire that flakes out. If it goes back to 100% normal after a restart I bet it isn't anything mechanical.

 

[boostmark]

It's likely a fuel issue. A misfire wouldn't cause it to bog down like that and its highly unlikely for half of the sparks and injectors to go bad at once. I'm not sure how Roush manages the extra fuel needed for the blower but there could be a voltage booster for the fuel pump. If there is one I would check on that. Make sure all the wiring is good. Take the fuel pump out and check out the tank. Make sure there are no contamination in the tank. Was the fuel tank full or on the lower side when it happened?

It had 3/4 tank of 93 octane. The Roush kit only uses bigger injectors and no boost a pump with the phase 1 setup. Stock fuel pump. Ran though 4 tanks of gas after winter and used fuel stablelizer. Car sits in winter with climate controlled garage.

 

[Goterr0r]

Check the intercooler brick pump to make sure its circulating the coolant. I had mine go out and when the IAT2's get really high can cause some of what you describe. You should be able to hear it or open the cap and see if coolant in that smaller reservoir is actually moving.

 

[Zrussian13]

I had this happen once in a stock gt when it was almost new. Left a gas station, when to hammer on it and it sputtered with no power and threw the cel. Pulled over right away and everything looked fine so I fired it back up and all was normal. No stored or pending code and it never happened again. It's the only time in 109k miles I've gone into limp mode and thrown a cel without a pending code. Long story short, you may be chasing ghosts....

 

[boostmark]

I had this happen once in a stock gt when it was almost new. Left a gas station, when to hammer on it and it sputtered with no power and threw the cel. Pulled over right away and everything looked fine so I fired it back up and all was normal. No stored or pending code and it never happened again. It's the only time in 109k miles I've gone into limp mode and thrown a cel without a pending code. Long story short, you may be chasing ghosts....

Thanks for all the replies. This was my dream car and I treat it as such. Worked on my own cars for 40 years, most of them used cars that needed work. Only mods were to make the car handle the power from the supercharger. Ben Calimer stage 2 trans, MGW shifter, Speck stage 3+ clutch and GT350 half shafts. Oh and my own exhaust cutouts, on - off on a Roush catback. I will change the fuel pump, fuel relay as well and go from there. I just don`t want to pull out in traffic and get hit.

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