I have a question about the idle range of my 2015 Subaru WRX after it has been sitting overnight. The 2015 Subaru WRX has 4 NHTSA complaints for the fuel/propulsion system at 38,975 miles average. Oil pressure was taken after cars oil was up to normal operating temp. What about vac pressure on the boost gauge what should that be at? First; I think high idle is normal until system gets warm enough for O2 sensor to start working. Remember, a vehicle needs air, fuel, and spark to run. 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.

and it reads opposite of what i assumed. i thought the psi would go down when i revved it but it goes up. Without them, you are in the dark.

If it goes bad (or if the fuel pressure really is out of the normal range) P0191 can and will appear. They are often specific enough to get you all the way to the problem, or pretty darn near. Takes my car a while to get down to normal idle range on a cold start unless I start driving right away. If it runs too lean, you’re likely to have p0171 accompany P0191. Is it ok to drive off before the idle comes down to "normal"?

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. P0191 is a common OBD-II code. What this locking does is provide a true mechanical connection from the engine to the wheels. If there is anything that you would like to add, please leave a comment below.

OP, when you first do a cold start, let the car warm up until the revs drop. A bad fuel pressure sensor can force the vehicle to overwork the fuel pump, thinking that it’s constantly starving for fuel when it is not. on how to clean a throttle body.

These were just some of the most common ones. A dirty throttle body can lead to stalling in your WRX. 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. A dirty throttle body may not trigger the check engine light. Does it look broken or damaged?

These codes are vital to diagnosis. 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. Here are some of the issues that cause the WRX to stall out. It needs them in the right quantities and intervals, or it won’t run right.

General Maintenance, Troubleshooting & Accidents. The most challenging part of diagnosing a stalling problem is reproducing the conditions that led to the stall in the first place. Please, please have your trouble codes read if there is a check engine light on at all.

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. 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. or is it an issue with my oil pressure? If you don’t own/want to buy a scanner, most local parts stores will run a scan for you at no cost (they want to sell you the parts). i just installed my fuel pressure gauge today. It’s worth a look, especially if you can’t remember the last time that you checked. 30psi@ idle … It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range. My 2015 Forester XT only at 43k miles and its summer throughout the year around 90F Last few weeks my cold … If the fuel pressure at the injectors is inconsistent, it’ll be really hard for your WRX to maintain a steady idle speed.

A bad fuel pump would act exactly like a bad fuel pressure regulator. If there is almost no oil left at all, the engine could be on its way to locking up. Check the fuel filter. This is typically noticed under heavy engine load. 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. Usually it’ll be a bad sensor reading, vacuum leak, or other problem that’ll cause the air/fuel mixture to be wrong. Published on Mar 28, 2015 Oil Pressure taken from right under alternator where oil pressure sensor is. At WOT it runs to 100psi (max reading on the gauge) Is there an issue with the gauge or the sensor? 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. Air Fuel Mixture– If the air/fuel mixture is off, your WRX can stall out. One of the most common issues your Subaru WRX is likely to develop is a stalling problem. P0191 is typically caused by a bad fuel pressure sensor, fuel pressure regulator, or an issue with the fuel rail pressure sensor wiring harness. Without a reliable reading from the fuel pressure sensor, your WRX may end up with the wrong air/fuel mixture. It should be approx 35 psi at idle. 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. That's the same range my 2013 wrx idles at. If there is anything that you would like to add, please drop a comment. Or, right after heavy engine load when the fuel pressure isn’t recovered enough for a proper idle. It can really help narrow down what you need to do. P0191 can be caused when the fuel pressure regulator is bad. If it goes bad, it can restrict the flow of fuel to the point that P0191 can be thrown. Is the connection to the sensor solid? 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. Fuel mileage can suffer when the air/fuel mixture isn’t correct. Completely normal on turbo cars and you should allow it to warm up and idle down before driving. Subaru WRX: Bad Fuel Pressure Regulator Diagnosis. Here’s a great YouTube video from EricTheCarGuy. If the reading seems off, you’ll need to manually check the fuel pressure.

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. 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. We invite you to join our Subaru Impreza WRX and STi community to discuss engine mods, builds, detailing, and more. Stalls can happen at any time, and it can be incredibly jarring when it does happen. Trouble codes are always a great place to start diagnosing problems on today’s modern computer controlled vehicles. This can lead to the engine dying when coming to a stop as well. 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. This is a generic code, which indicates that it has the same meaning for the Subaru WRX as it would any other vehicle. You’d notice hesitation and stalling as the fuel pump struggles to keep up with the demands of the engine. Cursing, with a warm engine, it reads 80 psi. If it looks bad, it may need to be replaced. You can also use it to check the fuel pressure reading as you drive. I was wondering this as well. 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. I have a question about the idle range of my 2015 Subaru WRX after it has been sitting overnight. When one of them goes wrong, it can lead to stalling for sure. Fuel issues are one of the most common reasons that a vehicle would stall out, that includes your Subaru WRX. All modern torque converters “lock”.

When P0191 is present, there typically are noticeable symptoms. Pretty much agreeing with all input. But, keep in mind, the coolant will come to temperature before the oil, so do not hoon it straight out of the driveway.

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. 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. Wiring issues can cause P0191 to be thrown. 2018 NUTUP STI / 2015 Buckeye Boxer WRX / 2003 Hammerdown Wagon WRX. P0191 can be a difficult code to track down, but should not be ignored. Discussion Starter • #1 • Mar 27, 2019. If your Subaru WRX’s engine timing is off, it’s going to stall out, misfire, and altogether not run properly. Good luck! This eliminates some driveline power loss and improves fuel mileage. At idle speed the enginge makes a little vibration after some seconds. Idle with a warm engine, it's at 20 psi.

- 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. The ECU then uses this information to adjust the timing, air fuel mixture, and more. Drivability is usually affected. For a better experience, please enable JavaScript in your browser before proceeding. Doing so very well could leave your Subaru WRX stranded. 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). 48 Posts . It’ll often throw code P0740. JavaScript is disabled. A good scanner can help you look at the conditions that were present when the code was set. My '15 WRX 6sp hangs out around 1500rpm for several minutes until it finally calms down. Clean the throttle body.

If it runs too rich, you may get black smoke and P0172. Before troubleshooting any automotive issue, including stalling issues with the WRX, make sure that you check the vehicles trouble codes with an OBD2 scanner. Good luck. At cold start it reads 80-100psi depending on how cold it is. Take a look at the wiring harness around the fuel pressure sensor.

As you can see above, there are many different reasons that your WRX could be stalling.

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). I installed an prosport electronic oil pressure gauge.

* Real engine and real idle sound for 2015 Subaru WRX STI car and MCI MC-12 bus in AI traffic. [slap] at an idle it stays at 22psi, when i rev it goes up to 35-39psi.