Power Loss

[Kilowtt1248]

My 2015 ST is about 30 % down on power. No engine codes other than a possible a bad wideband sensor .Can a bad wideband cause this reduction in power ? Also after we ran a diagnostic scan the car run great for two days then went back to the low power . I'm a new owner so not real familiar with these cars. Thanks for the help

 

[TyphoonFiST]

My 2015 ST is about 30 % down on power. No engine codes other than a possible a bad wideband sensor .Can a bad wideband cause this reduction in power ? Also after we ran a diagnostic scan the car run great for two days then went back to the low power . I'm a new owner so not real familiar with these cars. Thanks for the help

Is it tuned? Mileage? Absolutely it can effect power its the one that dictates the fueling*

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[haste]

30% down on power compared to what?

 

[Kilowtt1248]

Is it tuned? Mileage? Absolutely it can effect power its the one that dictates the fueling*

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Is it tuned? Mileage? Absolutely it can effect power its the one that dictates the fueling*

Sent from my SM-N975U1 using Tapatalk

It’s a 2015 with 95k miles. Compression check is good 160 per cylinder. It has a Cobb tune.

30% down on power compared to what?

30% down on power compared to what?

Just saying how it feels.

 

[TyphoonFiST]

It’s a 2015 with 95k miles. Compression check is good 160 per cylinder. It has a Cobb tune.


Just saying how it feels.

Change put the Spark plugs to Stock or a step colder if you'd like. Do a cam reset and get a flash tune from a vendor like Dizzy tuned or Stratified. I'd even go as far as getting am e30 if you have ethanol readily available. The Ignition coils may be getting weak. There lifespan isn't 100k more like 50-75k. You can get all 4 from Rock auto either Motorcraft or NGK will do.

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[Kilowtt1248]

Did the plugs. It’s had a Cobb tune so now it’s lock, need to find someone with a Cobb tuner. Cam reset is next and I didn’t think about the coils. Thanks

 

[TyphoonFiST]

What gap did you set them too?

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[Kilowtt1248]

What gap did you set them too?

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Stock

 

[Kilowtt1248]

To be honest I didn’t even check 🤷🏽‍♂️

 

[TyphoonFiST]

To be honest I didn’t even check [emoji2375]

Should be .028-.025*

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[Kilowtt1248]

Got it thanks.

 

[TyphoonFiST]

Got it thanks.

Make sure your Torque them correctly * it is 13 ft. Lbs. DON'T just give It the old crankeroo! Either* Please thread them in by hand also to avoid cross threading them.

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[flbchbm]

Cobb tune and Cruise Control....that got me by surprise. I don't remember the combo (something like OFF, OFF, down?), but if you press some special sequence, it will remove boost...I know somebody else here knows it well or just search for it. You can try the reversal sequence, but idk what it is. I tried another of my OTS tunes and it went away (I found out later about Cobb's feature)

 

[Kilowtt1248]

Really wow. I wouldn’t have thought of that. I’ll try it.

 

[Kilowtt1248]

Hey you were right it was the mapping on the cruise control, I must have changed it not knowing it had that feature. Thanks again for the help.

 

[flbchbm]

Hey you were right it was the mapping on the cruise control, I must have changed it not knowing it had that feature. Thanks again for the help.

My pleasure. What is the reversal button sequence?

 

[haste]

You just hit the "Cancel" button, then use the + and - buttons to change the maps. Each map is set to a 1K, 2K, 3K on the tach....so on and so forth. My 93 tune is set to 1K RPM. E30 is set to 2K. You'll see the tach jump between each setting.
The tuners can set these pretty easily. It times out around 3 seconds after hitting the cancel button.

The only thing I don't like about it is you CAN change it when you are using the CC and hit the cancel button. I'm always wary after hitting the cancel button and wait a few seconds before hitting my set button again.