That's the same range my 2013 wrx idles at. Without them, you are in the dark. i thought the psi would go down when i revved it but it goes up. Is the connection to the sensor solid? If the reading seems off, you’ll need to manually check the fuel pressure. If it goes bad, it can restrict the flow of fuel to the point that P0191 can be thrown. These codes are vital to diagnosis. The 2015 Subaru WRX has 4 NHTSA complaints for the fuel/propulsion system at 38,975 miles average. If it looks bad, it may need to be replaced. P0191 is a common OBD-II code. Take a look at the wiring harness around the fuel pressure sensor. and it reads opposite of what i assumed. Oil pressure was taken after cars oil was up to normal operating temp. They are often specific enough to get you all the way to the problem, or pretty darn near. A bad fuel pump would act exactly like a bad fuel pressure regulator. Subaru WRX: Bad Fuel Pressure Regulator Diagnosis. Idle with a warm engine, it's at 20 psi. If it goes bad (or if the fuel pressure really is out of the normal range) P0191 can and will appear. If it runs too lean, you’re likely to have p0171 accompany P0191. Get a fuel pressure gauge or borrow one and check the fuel pressure. At WOT it runs to 100psi (max reading on the gauge) Is there an issue with the gauge or the sensor? 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. Here are the most common issues that cause P0191 to be thrown: The fuel pressure sensor is responsible for telling your WRX’s ECM/PCM what the actual fuel pressure of the vehicle is. It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range. [slap] at an idle it stays at 22psi, when i rev it goes up to 35-39psi. If it runs too rich, you may get black smoke and P0172. 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. 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”. These were just some of the most common ones. Is it ok to drive off before the idle comes down to "normal"? One of the most common issues your Subaru WRX is likely to develop is a stalling problem. It’ll often throw code P0740. It should be approx 35 psi at idle. If there is almost no oil left at all, the engine could be on its way to locking up. General Maintenance, Troubleshooting & Accidents. Here’s a great YouTube video from EricTheCarGuy. Cursing, with a warm engine, it reads 80 psi. You can also use it to check the fuel pressure reading as you drive. - XJman, http://www.clubwrx.net/forums/builds/134419985-muchi-my-2015-cwp-wrx.html#post3579257, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. When one of them goes wrong, it can lead to stalling for sure. My '15 WRX 6sp hangs out around 1500rpm for several minutes until it finally calms down. It needs them in the right quantities and intervals, or it won’t run right. Published on Mar 28, 2015 Oil Pressure taken from right under alternator where oil pressure sensor is. Pretty much agreeing with all input. The fuel pressure regulator is responsible for making sure that the amount of fuel pressure that reaches the fuel rail is at a constant level (which will be less than pushed by the fuel pump). 30psi@ idle … * Real engine and real idle sound for 2015 Subaru WRX STI car and MCI MC-12 bus in AI traffic. 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. 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. JavaScript is disabled. on how to clean a throttle body. When P0191 is present, there typically are noticeable symptoms. Fuel issues are one of the most common reasons that a vehicle would stall out, that includes your Subaru WRX. Does it look broken or damaged? A dirty throttle body may not trigger the check engine light. This is a generic code, which indicates that it has the same meaning for the Subaru WRX as it would any other vehicle. Or he is rolling down the street in his new slammed ride vaping out the window, enjoying the tow truck ride. For a better experience, please enable JavaScript in your browser before proceeding. It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range. I have a question about the idle range of my 2015 Subaru WRX after it has been sitting overnight. This is typically noticed under heavy engine load. Good luck! If your Subaru WRX’s engine timing is off, it’s going to stall out, misfire, and altogether not run properly. What this locking does is provide a true mechanical connection from the engine to the wheels. Here are some of the issues that cause the WRX to stall out. Or, right after heavy engine load when the fuel pressure isn’t recovered enough for a proper idle. Before troubleshooting any automotive issue, including stalling issues with the WRX, make sure that you check the vehicles trouble codes with an OBD2 scanner. Takes my car a while to get down to normal idle range on a cold start unless I start driving right away. Trouble codes are always a great place to start diagnosing problems on today’s modern computer controlled vehicles. 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. If the fuel pressure reading is low, than you’re going to need to figure out if it’s the fuel pump or fuel pressure regulator that is causing P0191. 2018 NUTUP STI / 2015 Buckeye Boxer WRX / 2003 Hammerdown Wagon WRX. 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. or is it an issue with my oil pressure? Wiring issues can cause P0191 to be thrown. Completely normal on turbo cars and you should allow it to warm up and idle down before driving. There are many other sensors that can cause your WRX to stall. If there is anything that you would like to add, please leave a comment below. If you let off of the gas coming to a stoplight and it stalls for a second or two and recovers itself, it very well could be a dirty throttle body that is causing the problem. If the converter doesn’t unlock, then the engine will stall much like a manual vehicle does when it doesn’t have enough speed to carry a gear. It can really help narrow down what you need to do. The most challenging part of diagnosing a stalling problem is reproducing the conditions that led to the stall in the first place. 8L90E Specs, Performance, and Identification, TH400 Transmission Specs, ID, and Common Problems, Subaru Tribeca Stalling → Causes & Diagnosis, Volkswagen Amarok Stalling → Causes & Diagnosis, Chevy Impala: Brake Lights Stuck On → Diagnosis. 48 Posts . 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. At cold start it reads 80-100psi depending on how cold it is. First; I think high idle is normal until system gets warm enough for O2 sensor to start working. If there is anything that you would like to add, please drop a comment. Check the fuel filter. In regards to your second questions I recently got a Subaru wrx with the cvt and today when I sat in the car after it warmed up, the idle went to that and I also got the feeling it would stall. P0191 is a common OBD-II code. A good scanner can help you look at the conditions that were present when the code was set. Usually it’ll be a bad sensor reading, vacuum leak, or other problem that’ll cause the air/fuel mixture to be wrong. I have a question about the idle range of my 2015 Subaru WRX after it has been sitting overnight. The ECU then uses this information to adjust the timing, air fuel mixture, and more. If the manual fuel pressure reading is normal, then you know that you’ve got an issue with the fuel pressure sensor (or the wiring going to and from it). Air Fuel Mixture– If the air/fuel mixture is off, your WRX can stall out. My 15 limited does the same thing, sometimes when its cold in the morning it will do it for about 1 and 1/2 minutes, other times may be 30 seconds are less depending on how long the car has been sitting. Clean the throttle body. P0191 is typically caused by a bad fuel pressure sensor, fuel pressure regulator, or an issue with the fuel rail pressure sensor wiring harness. It’s worth a look, especially if you can’t remember the last time that you checked.
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