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- A vehicle’s emission system can be a breeding ground for misfires. If the exhaust is leaking, it can cause carbon build-up in the cylinders and valves which leads to a misfire. This is an easy fix as long as you have access to a diagnostic tool such as an OBD II scanner and know how to use it.
www.competitionsubaru.com/how-to-fix-a-misfiring-subaru-engine/
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Oct 28, 2010 · Try changing the fuel filter. On the 04+ WRX's/STI's double check the fuel pump"sock" in the tank. The maintenance schedule for the filter is every 30K miles. Have the injectors professional cleaned or at least run several bottles of a good injector cleaner through the gas tank.
- P0302 Meaning: Cylinder 2- Misfire Detected
- WRX P0302 OBDII Code Symptoms
- P0302 Trouble Code Causes: Subaru WRX
- P0302 Fix: Subaru WRX
- P0302 + Other Codes
- Common Questions
- Conclusion
Cylinder 2
P0302 is a cylinder-specific misfire code, meaning it’s only the second cylinder that has a misfire. But, where is the second cylinder? On “V” configuration engines, it’ll usually be the first cylinder on the head further back from the front of the engine. A quick google image search will confirm the correct cylinder (include your WRX’s model year and engine type).
Misfire Detected
In order for an engine to burn fuel efficiently, each cylinder needs: 1. Fuel– In the right quantity (around 14.7 parts air to one part fuel). 2. Air– It needs to be metered by your WRX’s mass air flow sensor or MAP sensor, so the powertrain control module (PCM) knows exactly how much air to let into the combustion chamber. 3. Spark– The spark plug needs to fire at the right time and at the right temperature. 4. Compression– The air-fuel mixture must be compressed during the engine’s power st...
Here are the most common symptoms of P0302 in the Subaru WRX. 1. Check engine light 2. The car itself may begin to run rough. It depends on how serious the misfire is. 3. Your WRX may produce excess vibration, especially at lower RPM. 4. Fuel mileage may suffer. 5. You may smell raw gas coming from the tailpipe. 6. The engine may backfire.
There are quite a few things that can cause the P0302 trouble code to trigger in the Subaru WRX. Here are the most common problems that may cause misfiring. They are presented somewhat in order from most to least likely to be causing P0302: 1. Bad Spark Plugs– A fouled spark plug is the most common cause of P0302. Look at the electrodes and see if ...
If P0302 is the only code you get when you plug an OBD II scanner into your WRX, this section should help you determine what is causing the code. If you have multiple codes with P0302, jump down a section.
P0302 + P0300
The most likely reason your WRX will get P0300 and P0302 simultaneously is faulty spark plugs. P0300 in the Subaru WRXindicates random multiple misfiring, which means that multiple cylinders are misfiring at the same time. If your Subaru WRX has P0300 and P0302 error codes, it’s best to diagnose why the second cylinder is misfiring and see if that will fix the P0302 code. Try doing the swap test from the previous section. Make note of the condition of BOTH spark plugs as you swap them. If the...
P0302 + P0171
Look for a vacuum leak around the second cylinder or a bad fuel injector. P0171 is one of the most common trouble codes there is. While there are many potential causes for P0171, the most prevalent is a vacuum leak. When your WRX has P0302 and P0171 together, it’s often caused by a clogged or underperforming fuel injector.
P0302 + Other Cylinder Misfire Codes
Treat P0302 with these codes like it has P0300. P0302 will often be accompanied by codesP0301,P0303,P0304, P0305, etc… These codes indicate a misfire in cylinders one, three, four, and five, respectively. Treat P0302 with these codes like it has P0300. Suspect an ignition-related cause or a vacuum leak.
Is P0302 a serious concern?
P0302 is cause for concern and, left unfixed, can leave you stranded. Your WRX will be virtually undrivable if the second cylinder stops firing altogether. The raw fuel can also damage the catalytic converter.
Can you drive your WRX with P0302?
We do not advise driving your WRX with P0302. It can cause damage to your car.
Is P0302 hard to repair?
Most of the time, P0302 is not hard to repair, as you’ll be swapping out ignition parts. It’s a great first-time project for a shade tree mechanic. If the problem ends up not being ignition related, that’s when you might have to bring it into a shop.
Replacing the spark plug or coil packs is the most common fix for P0302 in the Subaru WRX. There are other causes, but the swap test can help narrow them down considerably.
A misfire means that your engine isn’t running as efficiently as it should be: either there’s too much or too little fuel being injected into each cylinder, air is going into the wrong cylinders, or something is blocking the flow of exhaust gases out of the engine.
Oct 8, 2013 · I found this post, which was the first to describe my exact symptoms (randomly occurring misfire on all 4 cylinders, checked all the usual stuff that commonly causes misfires and nothing seemed to help), followed the instructions, and it idled and drove perfectly on the test drive!
Nov 7, 2012 · I'm trying to get down the root of the problem. This is for a 2005 Subaru WRX with 93k miles on it. I haven't driven my car many miles in the past months. Probably 1,000 miles over 7 months. I try to take it out once a week for about 15-20 mile drive. I recently starting having problems.
May 12, 2009 · Issue Details. 1st occurrence – cyl 1 and cyl 3 while cruising on the freeway: no engine stutter, hesitation or difference in feel/noise. Changed plugs, Reset the ECU – car ran the same; perfectly fine. Approximately 700-800 miles later another misfire this time on the other 2 cylinders.
Nov 19, 2018 · Replacing the spark plugs is the most common fix for P0301 in the Subaru WRX. There are other causes, but the swap test can help narrow them down considerably. P0301 is a fairly common trouble code with the Subaru WRX. It's an OBD2 code and indicates that your car’s first cylinder is misfiring.
