Frequently Asked Questions
Do I need anything to run E30/E85?
For E30 you do not need to change anything but the tune on the car. However we will not tune a Mustang or Fiesta on E30 without an upgraded intercooler. The Focus RS intercooler is OK but could benefit from being upgraded. The biggest benefit of E30 is that you can run more spark, that is where most of the power comes from. If you have a stock intercooler the charge air temps reduce spark timing to prevent knock. Though the chances of getting knock on an E30 tune is low we still prefer to make the most out of the tune without any handicaps. We recommend the ETS intercooler for its perfect fitment, unbeatable performance, anodizing options, and affordable price. For the Fiesta ST we recommend the MAPerformance Intercooler. Link for the ETS/MAP intercooler below:
Straight E85 you will need one of our port injection systems linked below, for the Fiesta ST there will be a kit available in the future:
The link above contains all information on what is needed to run E85 in your vehicle along with suggested modifications to run in conjunction with the port injection system.
First step is to test the E85 percentage at the pump you are going to be using. You can test it with the below:
- Focus RS - 13.9 Gallons
- Ecoboost Mustang - 15.5 Gallons
- Fiesta ST - 12.4 Gallons
Check Engine Lights
Here is a list of common check engine lights and their cause:
- P04DB - This mostly comes up when you alter the PCV system with a catch can or breather plate.
- P0171 - Common with ethanol tunes or modified intake systems, it gives a false lean condition due to over compensation of the ECU to maintain stoich AFR.
- P0141 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
- P0131 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
- P0054 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
- P0135 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
- P0137 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
- P0138 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
- P0420 - Fault in the rear o2 sensor, mostly from aftermarket downpipes
- P061B - Torque error from the tune not accounting for additional torque
- P0035 - Bypass valve unplugged, most common with aftermarket BOV
- U0284 - Grill shutters unplugged, most common with intercooler installs as shutters have to be removed.
- P0071 - Ambient Air Temperature unplugged, this sensor is usually overlooked when an intercooler is installed. It is located on the lower grill shutter and needs to be removed from the shutters and re-installed
My Car Smokes After Exhaust Changes
If you get a smoking issue after you installed a downpipe or catback exhaust you need to address your PCV system. The factory PCV doesn't allow for enough crankcase venting and builds pressure and pushes oil past the turbo seals. The solution is to add a catch can and gut the factory PCV valve or run a Radium Crankcase Breather Plate linked below. Both will require a catch can, you cannot gut the factory PCV and run it in the stock configuration as you will pressurize your crankcase system and cause more issues.
- Ecoboost Mustang UPR Catch Can
- Focus RS Radium Catch Can
- All 2.0/2.3L Ecoboost Radium PCV Baffle Plate
Ecoboost Mustang Fuel Sensor / EVAP Solenoid
The Ecoboost Mustang has received updated lowside fuel pressure sensors and EVAP Purge solenoids over the years. No information provided by Ford, just new part numbers and clear updates to the product. These new parts magically fix known issues with the Ecoboost Mustang.
- The new lowside fuel pressure sensor cures a High Pressure Fuel problem. When the lowside fuel pressure sensor fails, when you get into load the fuel rail pressure will drop to almost 0. The high pressure fuel pump thinks there is a problem and instead of bypassing it just simply shuts down.
- The EVAP purge solenoid update cures and issues with the short term fuel trims when under load. When the EVAP purge solenoid fails the short term fuel trims will go to 0 and you will not get any fuel corrections under load (mostly full throttle) and the car can potentially go lean. If you have port injection or methanol injection, or making 400whp+ this can cause catastrophic failure.
- Both items can fail without any check engine light, and you would have no way of knowing. It is best to just replace both of them to avoid any issues, they are extremely cheap.
Lowside Fuel Pressure Sensor Part Number - BU5Z-9F972-B
Evap Purge Solenoid Part Number - FR3Z 9G297 C
To know if you have the updated parts above, they will look like this: