2015 wrx fuel pressure at idle

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. I have a question about the idle range of my 2015 Subaru WRX after it has been sitting overnight. This eliminates some driveline power loss and improves fuel mileage. Here’s a great YouTube video from EricTheCarGuy.

Without a reliable reading from the fuel pressure sensor, your WRX may end up with the wrong air/fuel mixture. They are often specific enough to get you all the way to the problem, or pretty darn near. P0191 is a common OBD-II code. It should be approx 35 psi at idle. 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. Please, please have your trouble codes read if there is a check engine light on at all. You’d notice hesitation and stalling as the fuel pump struggles to keep up with the demands of the engine. Does it look broken or damaged? At WOT it runs to 100psi (max reading on the gauge) Is there an issue with the gauge or the sensor? on how to clean a throttle body. Check the fuel filter. 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. At idle speed the enginge makes a little vibration after some seconds. First; I think high idle is normal until system gets warm enough for O2 sensor to start working. It needs them in the right quantities and intervals, or it won’t run right.
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). This is a generic code, which indicates that it has the same meaning for the Subaru WRX as it would any other vehicle. Without them, you are in the dark.

For a better experience, please enable JavaScript in your browser before proceeding. 48 Posts . Completely normal on turbo cars and you should allow it to warm up and idle down before driving.

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. These were just some of the most common ones. As you can see above, there are many different reasons that your WRX could be stalling. If there is almost no oil left at all, the engine could be on its way to locking up. 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 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. Discussion Starter • #1 • Mar 27, 2019. Subaru WRX: Bad Fuel Pressure Regulator Diagnosis. 2018 NUTUP STI / 2015 Buckeye Boxer WRX / 2003 Hammerdown Wagon WRX. If there is anything that you would like to add, please leave a comment below. General Maintenance, Troubleshooting & Accidents. If there is anything that you would like to add, please drop a comment. It can really help narrow down what you need to do. 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.

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. I have a question about the idle range of my 2015 Subaru WRX after it has been sitting overnight. One of the most common issues your Subaru WRX is likely to develop is a stalling problem. This can lead to the engine dying when coming to a stop as well.

If it looks bad, it may need to be replaced. Take a look at the wiring harness around the fuel pressure sensor. 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. It’s worth a look, especially if you can’t remember the last time that you checked. Cursing, with a warm engine, it reads 80 psi. Pretty much agreeing with all input. i thought the psi would go down when i revved it but it goes up. Or he is rolling down the street in his new slammed ride vaping out the window, enjoying the tow truck ride.

Or, right after heavy engine load when the fuel pressure isn’t recovered enough for a proper idle. The ECU then uses this information to adjust the timing, air fuel mixture, and more.

Is it ok to drive off before the idle comes down to "normal"? What about vac pressure on the boost gauge what should that be at? 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. There are many other sensors that can cause your WRX to stall. This is typically noticed under heavy engine load. It’ll often throw code P0740. * Real engine and real idle sound for 2015 Subaru WRX STI car and MCI MC-12 bus in AI traffic. or is it an issue with my oil pressure? Published on Mar 28, 2015 Oil Pressure taken from right under alternator where oil pressure sensor is. Trouble codes are always a great place to start diagnosing problems on today’s modern computer controlled vehicles.

Takes my car a while to get down to normal idle range on a cold start unless I start driving right away. OP, when you first do a cold start, let the car warm up until the revs drop. 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. When one of them goes wrong, it can lead to stalling for sure.

We invite you to join our Subaru Impreza WRX and STi community to discuss engine mods, builds, detailing, and more. Get a fuel pressure gauge or borrow one and check the fuel pressure. My '15 WRX 6sp hangs out around 1500rpm for several minutes until it finally calms down. If the reading seems off, you’ll need to manually check the fuel pressure. - 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. Drivability is usually affected. P0191 is typically caused by a bad fuel pressure sensor, fuel pressure regulator, or an issue with the fuel rail pressure sensor wiring harness. Stalls can happen at any time, and it can be incredibly jarring when it does happen. and it reads opposite of what i assumed.
Clean the throttle body. 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. 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. I was wondering this as well. When P0191 is present, there typically are noticeable symptoms. Usually it’ll be a bad sensor reading, vacuum leak, or other problem that’ll cause the air/fuel mixture to be wrong. At cold start it reads 80-100psi depending on how cold it is. 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 some of the issues that cause the WRX to stall out. Is the connection to the sensor solid?

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. Before troubleshooting any automotive issue, including stalling issues with the WRX, make sure that you check the vehicles trouble codes with an OBD2 scanner. P0191 can be caused when the fuel pressure regulator is bad. i just installed my fuel pressure gauge today. Wiring issues can cause P0191 to be thrown. If it runs too rich, you may get black smoke and P0172. 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). P0191 can be a difficult code to track down, but should not be ignored. The 2015 Subaru WRX has 4 NHTSA complaints for the fuel/propulsion system at 38,975 miles average. Good luck.

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