SUBARU DIAGNOSTIC

I HAVE A BOOST LEAK, WHERE COULD IT BE?

 

 

Answer: If your tuner mentions you have a boost leak, Just know you will either have an easy time finding it or a very hard time finding it. You may even go get a smoke test and find there was no leak, but the biggest mistake here is that most people check over parts and end up fixing it before the boost leak smoke test. The biggest advice I can give is to make sure you recheck any parts that you touched while installing or removing parts. Any part that moves air through it can produce a leak. Anything over a +|- 20% in AF Correction/Learning would be considered a leak. 

COMMON AREAS FOR LEAKS FOR FA20 WRX:

  • COBB SF INTAKE FILTER NOT BEING ON EXACTLY ONE INCH ON THE PIPE

  • CHARGE PIPE TO INTERCOOLER COUPLER

  • CHARGE PIPE TO TURBO GASKET

  • TGV GASKET OR NOT TIGHTEN DOWN

  • INTAKE TO TURBO

  • EBCS HOSES DAMAGED

  • FMIC INTERCOOLER PIPING

  • INTAKE MANIFOLD

  • EVAP LINES

  • JPIPE NOT TIGHTEN DOWN TO TURBO 

 

 

HOW SHOULD I ROUTE MY EBCS?

 

Most EBCS like COBB or GS have 3 ports. Port 1 = Intake, Port 2 = Wastegate, Port 3 = Turbo

EWG will be set up with the following:

  • Port 1 to Intake

  • Port 2 to the Bottom port of wastegate, Leave the top port of wastegate Open(Vent to Air). If Dual EWG you will Tee off from the Port 2 and run both hoses to the bottom of both wastegates and leave the top of the wastegates open. 

  • Port 3 to Turbo

 

I AM ONLY BOOSTING 10-12 PSI ON MY FIRST MAP, IS IT A PROBLEM?

 

Most base maps sent will be sent with low boost settings. So it doesn't mean you have a boost leak. If a tuner tells you, that your car is having issues with proper boost levels then it can be any of the following reasons:

  • Boost leak

  • Bad EBCS

  • EBCS hooked up wrong

  • Turbo is dead. 

WHAT SPARK PLUGS SHOULD I GET AND GAP SHOULD I RUN?

OEM Stock NGK should be fine. Plug gap - .020 to .022. Make sure to check the plug gap before installing it. 

IF IM TUNED BY YOU AND MY CAR IS HAVING A ISSUE WHAT SHOULD I DO?

  • Reflash the map and see if the problem still happens. 

  • If the problem still happens after a reflash then complete the 4 logs I asked for and send them to the tuning email we started for the tune. 

I HAVE A CODE FOR COBB1 OR COBB2 AFTER INSTALLING A FLEX KIT, WHAT COULD BE THE ISSUE?

  1. Log TGV L Volts(For 99.9% of my customers)

  2. Read below for possible issues

  • 0.0V - Power or ground supply fault, module fault

    • Suggestion: Check connections to rear o2 and TGV harnesses. BOTH must be plugged in (or wire in) for unit to function. Confirm supply voltage and ground continuity if the issue persists and harnesses are connected.

  • 0.1V - Sensor fault, the module to sensor electrical connection fault, waiting for sensor data

    • Suggestion: Check connections for continuity, replace harness if necessary. If harness tests well, reset ECU and try again. If the issue returns, replace the sensor.

  • 0.2V - Sensor error, internal fault

    • Suggestion: Replace the sensor.

  • 4.8V - Sensor/Fuel error, compensation out of range

    • Suggestion: Remove fuel from the car if possible, flush fuel system with known good fuel and see if issues returns. If persists, replace the sensor.

  • 4.9V - Fuel error (water, debris)

    • Suggestion: Remove fuel from the car if possible, flush fuel system with known good fuel. While water in your fuel is the most common cause, debris or some fuel additives may prevent ethanol sensors from getting a proper reading if in high enough concentration.

  • 5.0V - Wiring short

    • Suggestion: Check to wire for damage, short.