At idle speed the enginge makes a little vibration after some seconds. Take a look at the wiring harness around the fuel pressure sensor. Before troubleshooting any automotive issue, including stalling issues with the WRX, make sure that you check the vehicles trouble codes with an OBD2 scanner. Discussion Starter • #1 • Mar 27, 2019. I have a question about the idle range of my 2015 Subaru WRX after it has been sitting overnight. If it goes bad, it can restrict the flow of fuel to the point that P0191 can be thrown. A bad fuel pump would act exactly like a bad fuel pressure regulator. Takes my car a while to get down to normal idle range on a cold start unless I start driving right away. Please, please have your trouble codes read if there is a check engine light on at all. Check the fuel filter.

This eliminates some driveline power loss and improves fuel mileage.

P0191 can be caused when the fuel pressure regulator is bad. OP, when you first do a cold start, let the car warm up until the revs drop. I was wondering this as well. Bad Fuel Injectors– If the fuel injection system is allowing too much or too little fuel into the combustion chamber, than your WRX will stall out. Get a fuel pressure gauge or borrow one and check the fuel pressure. It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range. Idle with a warm engine, it's at 20 psi. * Real engine and real idle sound for 2015 Subaru WRX STI car and MCI MC-12 bus in AI traffic.

You’d notice hesitation and stalling as the fuel pump struggles to keep up with the demands of the engine. We invite you to join our Subaru Impreza WRX and STi community to discuss engine mods, builds, detailing, and more. Here are the facts: I just picked up a '15 Subaru WRX Limited with CVT and it seemed as though the idle speed - the car is started cold (~72 degree ambient temperature in the garage) - is relatively high (1,500 - 1,800 RPM) and remains there until I start driving.

i thought the psi would go down when i revved it but it goes up. JavaScript is disabled.

Drivability is usually affected. If there is anything that you would like to add, please drop a comment. I installed an prosport electronic oil pressure gauge. If there is almost no oil left at all, the engine could be on its way to locking up. It can really help narrow down what you need to do. Trouble codes are always a great place to start diagnosing problems on today’s modern computer controlled vehicles.

Here’s a great YouTube video from EricTheCarGuy. My '15 WRX 6sp hangs out around 1500rpm for several minutes until it finally calms down. Stalls can happen at any time, and it can be incredibly jarring when it does happen. P0191 is typically caused by a bad fuel pressure sensor, fuel pressure regulator, or an issue with the fuel rail pressure sensor wiring harness. Doing so very well could leave your Subaru WRX stranded. At cold start it reads 80-100psi depending on how cold it is. If it goes bad (or if the fuel pressure really is out of the normal range) P0191 can and will appear. Good luck! This is a generic code, which indicates that it has the same meaning for the Subaru WRX as it would any other vehicle. [slap] at an idle it stays at 22psi, when i rev it goes up to 35-39psi.

These codes are vital to diagnosis. Good luck. For a better experience, please enable JavaScript in your browser before proceeding. This can lead to the engine dying when coming to a stop as well. If your Subaru WRX’s engine timing is off, it’s going to stall out, misfire, and altogether not run properly. It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range. The ECU then uses this information to adjust the timing, air fuel mixture, and more. As you can see above, there are many different reasons that your WRX could be stalling. It should be approx 35 psi at idle. A dirty throttle body can lead to stalling in your WRX. In the end, you will have a smoother running engine, get better fuel economy and even get rid of that misfire or check engine light. If there is anything that you would like to add, please leave a comment below. Here are the most common symptoms of P0191: If there isn’t enough fuel pressure getting to the fuel injectors, the engine may stall out or hesitate in certain situations. My 2015 Forester XT only at 43k miles and its summer throughout the year around 90F Last few weeks my cold … Fuel issues are one of the most common reasons that a vehicle would stall out, that includes your Subaru WRX. If the fuel pressure at the injectors is inconsistent, it’ll be really hard for your WRX to maintain a steady idle speed. Here are some of the more common causes of an engine timing problem: Your Subaru WRX uses a series of complex sensors to report what is going on to the ECU. Completely normal on turbo cars and you should allow it to warm up and idle down before driving. If it runs too rich, you may get black smoke and P0172. There are many other sensors that can cause your WRX to stall. Or he is rolling down the street in his new slammed ride vaping out the window, enjoying the tow truck ride. P0191 is a common OBD-II code. - XJman,, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Without a reliable reading from the fuel pressure sensor, your WRX may end up with the wrong air/fuel mixture. All modern torque converters “lock”. If the reading seems off, you’ll need to manually check the fuel pressure. It’ll often throw code P0740. i just installed my fuel pressure gauge today. Published on Mar 28, 2015 Oil Pressure taken from right under alternator where oil pressure sensor is. When P0191 is present, there typically are noticeable symptoms. Or, right after heavy engine load when the fuel pressure isn’t recovered enough for a proper idle. So, if your stalling happens when coming to a stop, and the check engine light is on, it may be worth taking a look at it.

The most challenging part of diagnosing a stalling problem is reproducing the conditions that led to the stall in the first place. Here are some of the issues that cause the WRX to stall out. You can also use it to check the fuel pressure reading as you drive. 8L90E Specs, Performance, and Identification, TH400 Transmission Specs, ID, and Common Problems, Subaru Tribeca P0191:  Fuel Rail Pressure Sensor → Circuit “A” → Range/Performance, Volkswagen Amarok P0191:  Fuel Rail Pressure Sensor → Circuit “A” → Range/Performance, Chevy Impala: Brake Lights Stuck On → Diagnosis.

Usually it’ll be a bad sensor reading, vacuum leak, or other problem that’ll cause the air/fuel mixture to be wrong. General Maintenance, Troubleshooting & Accidents.

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