Torque App, Flex Fuel

[calgator73]

Not trying to be a dick, but please stop spreading misinformation. You're wrong about needing a sensor, as I already stated,07-13 trucks did not have a sensor and were capable. The computer has programmed algorithms to figure it out, not as quickly as a dedicated sensor, but it does it nonetheless. If you can't confirm where this sensor is, or if it can be added to a non ffv truck, then you're just clouding up the post with false info. I'm very well aware of e85 fuel requirements, just trying to get proper and exact info on the subject.

You are being a bit of a dick unless GM is wrong:

"The flexible fuel sensor of the 4.3L V6 and 5.3L V8 measures the ethanol-gasoline ratio of the fuel being used in a flexible fuel (E85 capable) engine. Flexible fuel vehicles can be operated with a blend of ethanol and gasoline, up to 85 percent ethanol.

 

Since the flexible fuel sensor measures the actual percentage of ethanol in the fuel, it is no longer necessary to wait for an empty fuel tank in order to refill with E85. The flexible fuel sensor measures the two different fuel related parameters, and sends an electrical signal to the ECM to indicate ethanol percentage and fuel temperature.

 

The flexible fuel sensor uses quick-connect style fuel connections, an incoming fuel connection, and an outgoing fuel connection. All fuel passes through the flexible fuel sensor before continuing on to the fuel rail."

 

I can't find a part number for it though.

 

You are absolutely correct on the GMT900 however:

"E85 Flex Fuel Description

 

E85 compatible vehicles no longer use an alcohol sensor to determine and adjust for the alcohol content of the fuel in the tank. Instead, the vehicle calculates the alcohol content of the fuel through measured adjustments.

 

The ethanol calculation occurs with the engine running after a refueling event has been detected via a measured change in the fuel level sender output. The virtual flex fuel sensor (V-FFS) algorithm temporarily closes the canister purge valve for a few seconds and monitors information from the closed loop fuel trim system to calculate the ethanol content. This logic executes several times until the ethanol calculation is deemed to be stable. This may take several minutes under low fuel flow conditions such as idle, or a shorter time during higher fuel flow, off-idle conditions.

 

Air-fuel ratios and the corresponding ethanol percentage are updated following each purge-off sequence. The fuel alcohol content percentage value can be read on a scan tool.

 

When an E85 compatible vehicle is built, an ECM or PCM replaced, or if the learned alcohol content has been reset with a scan tool the fuel system will need to contain ASTM gasoline with 10 percent or less ethanol content.

 

A minimum of 11 liters (3 gallons) must be put in the tank in order for the vehicle to recognize a re-fueling event. It is not necessary to turn the ignition OFF in order to have the re-fueling event recognized, however local safety regulations should be followed.

 

After the re-fueling event, the system registers the amount of fuel that was added, relative to the amount that was in the tank. Reading fuel trim and O2 sensor activity, the system determines if the fuel added was either ASTM Gasoline or ASTM E85. Based on that determination, the system adjusts to the expected alcohol mix in the fuel tank, and then the fuel trim and O2 sensor activity fine tunes the adjustments. The system must remain in closed loop in order for this adjustment to occur. Numerous short trips after switching from gasoline to E85, or E85 to gasoline, can result in driveability symptoms due to the inability of the system to adjust for fuel composition by not attaining closed loop operation."

[redwngr]

2014 gm literature listed higher horsepower rating for the 5.2 when operation with e85.

 

I have not seen e85 published numbers for 2015.

 

2015's have RPO code FHS to add e85 capability to the 5.3.

 

"FHS NEW! E85 FlexFuel capable

all sierra trims - Included with (LV3) 4.3L EcoTec3 V6 engine. Available to order with (L83) 5.3L EcoTec3 V8 engine."

[Beatme]

You are being a bit of a dick unless GM is wrong:

"The flexible fuel sensor of the 4.3L V6 and 5.3L V8 measures the ethanol-gasoline ratio of the fuel being used in a flexible fuel (E85 capable) engine. Flexible fuel vehicles can be operated with a blend of ethanol and gasoline, up to 85 percent ethanol.

 

Since the flexible fuel sensor measures the actual percentage of ethanol in the fuel, it is no longer necessary to wait for an empty fuel tank in order to refill with E85. The flexible fuel sensor measures the two different fuel related parameters, and sends an electrical signal to the ECM to indicate ethanol percentage and fuel temperature.

 

The flexible fuel sensor uses quick-connect style fuel connections, an incoming fuel connection, and an outgoing fuel connection. All fuel passes through the flexible fuel sensor before continuing on to the fuel rail."

 

I can't find a part number for it though.

 

You are absolutely correct on the GMT900 however:

"E85 Flex Fuel Description

I really do apologize if I came off that way, that's not what I'm going for lol. You are on to exactly what I'm trying to figure out though. I know gm states there is a sensor on the new trucks, I'm just trying to see if it's active on a scan from a 2015 truck, and if not, is it possible to add it to the system. I would love to know where it's physically located and what the actual part number is. For all we know it may be there already, but just not enabled on the computer, and that's what the $100 order code gets you. I like factual data, that's all. I'm not into the he said she said false information about this stuff, and with this community here we should be able to figure this out without a problem.

[calgator73]

I really do apologize if I came off that way, that's not what I'm going for lol. You are on to exactly what I'm trying to figure out though. I know gm states there is a sensor on the new trucks, I'm just trying to see if it's active on a scan from a 2015 truck, and if not, is it possible to add it to the system. I would love to know where it's physically located and what the actual part number is. For all we know it may be there already, but just not enabled on the computer, and that's what the $100 order code gets you. I like factual data, that's all. I'm not into the he said she said false information about this stuff, and with this community here we should be able to figure this out without a problem.

Fair enough. I'm here for the same reason...always curious and want to help. I'll take a look under my truck today and see if I can see anything plumbed into the fuel line so I can pull a part number or a picture. In other areas of the truck people (back-up camera being an example) have figured out that the software is ready to go...it's simply a matter of plugging in. Did find this blurb in the 2015 owners manual:

 

"For the 6.0L V8 engine, after

refueling, the vehicle calculates the

composition of the fuel. It is not

recommended to repeatedly switch

between fuels. If fuels are switched

frequently, add as much fuel as

possible and do not add less than

11 L (3 gal) when refueling. Drive at

least 11 km (7 mi) immediately after

refueling to allow the vehicle to

adapt to the change in ethanol

concentration."

 

Also found something completely unrelated that I don't recall seeing before in an owners manual:

 

If TOP TIER Detergent Gasoline is

not available, one bottle of Fuel

System Treatment PLUS added to

the fuel tank at every engine oil

change can help. Fuel System

Treatment PLUS is the only

gasoline additive recommended by

General Motors. It is available at

your dealer.

 

 

[calgator73]

Flex fuel Sensor part number 13577429 price $88.82 and in stock at local dealer. According to his computer is located on the driver side frame rail halfway between the fuel tank and the rear of the transmission

[Beatme]

Flex fuel Sensor part number 13577429 price $88.82 and in stock at local dealer. According to his computer is located on the driver side frame rail halfway between the fuel tank and the rear of the transmission

My man! That's exactly where I saw an unused plug on the crossmember directly beneath the fuel lines. Now to figure out if it'll plug in and be usable...

[calgator73]

Best of luck! BTW...fuel injectors are the same part number for both motors.

[Beatme]

Just ordered it from gmpartsdirect for $59 to my door. I'll post my results for anyone other than me that might care. Haha

[ZmanII]

I wonder why it still isn't standard on the 2015s?

[Rawyzf]

Can't wait to hear results.

[redwngr]

I wonder why it still isn't standard on the 2015s?

I was standard in 14.

De-contented on the 5.3 for 15.

 

Must not be enough customers demanding it.

[roadblock]

Looking forward to hearing about the results

[diggman08]

so what exactly is the point of this. I have 14' so it is is a flex fuel. there is an app for iphone to monitor? and for what reason? sorry just not sure what this is all about and if its even worth messing with

[Beatme]

I guess the point of this is to see if the guys with a '15 non flex fuel truck can easily convert it to a flex fuel truck. It's for my own curiosity more than anything, but should hopefully be able to help others that would want to convert too. As far as the app, there are numerous obdii scanner apps out there for looking inside your trucks computer, seeing how sensors are performing, resetting codes, etc. I'm the kind of guy that can't leave anything alone, and I mess with everything I can get my hands on, so a matter of worth is all in your own opinion lol.

[bigsapper]

so what exactly is the point of this. I have 14' so it is is a flex fuel. there is an app for iphone to monitor? and for what reason? sorry just not sure what this is all about and if its even worth messing with

E85 content is "up to". Mine is usually E80.