Subaru Cylinder 4 Misfire

Possible causes of OBD code P0304 Subaru A code P0304 Subaru may mean that one or more of the following has happened: Faulty spark plug or wire Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector Burned exhaust valve Faulty catalytic converter(s) Running out of fuel Poor compression Defective computer. Categories Ram Tags 2019 Dodge Ram, 2019 dodge ram 0 to 60, 2019 dodge ram 0-60, 2019 dodge ram 1500, 2019 dodge ram 1500 diesel, 2019 dodge ram 1500 for sale, 2019 dodge ram 1500. Original code was a injector cyl#1 open. Bank 1 has the No. Cylinder misfire. Thanks guys. Installed the MSD coil on my 99 Subaru Legacy GT. Code came back about 5 miles later as cyl 4 misfire (P0304). 7 Problems, DIY, Head Gasket Repl. And the scan tool shows a #4 misfire code. It's been a long time that I have ran into a cylinder misfire problem that I couldn't just go directly to the source of the problem by some quick preliminary tests. ) compression and 4. I don't notice any shuttering or anything going wrong, it just trips the CEL light. And this is what caused a cylinder misfire issue. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0304 CYLINDER 4 MISFIRE DETECTED">Go to Step 12. What is a Misfire? First, let's examine what causes a misfire. Intermittent Cylinder Misfire Subaru Valve Guide Problem Whenever you remove a Subaru cylinder head you should always look at the valve guides to see if there is any evidence of them moving, particularly the exhaust valve guides. Primary or secondary ignition components can go bad and prevent the spark from being delivered properly to the cylinder which would result in an engine or cylinder misfire. 2003 and newer models are not covered under WWP-99 and supposedly not prone to head gasket leakage. 6L 6cyl CVT) on Edmunds, or submit your own review of the 2015 Outback. Up to about 9 psi of boost its fine, after that the car shudders and dumps boost. She also had a cracked coil body on cylinder 4, so I replaced that recently. Bought a scanner and everytime cel is on its for a cylinder 4 misfire. This engine ended up having a burned valve, and was causing the misfire. How much can a repair cause? It depends on the cause. I drive the car for another 150 miles with no further performance issues. I keep getting a misfire on cylinder 2 and 4. The last digit of the code P030X stands for the misfiring cylinder number. Refill the fuel so that the fuel meter indication is higher than the "Lower" level, and proceed to the next step. This time cyl 4 codes are being read from my plx kiwi that i keep in my car. theres no coolant, oil level is real high and gross. Cylinder heads are a vital part of a working cylinder. When the vehicle stalled, it registered P0300 (Random Misfire), P0301 (Cylinder 1), P0302 (Cylinder 2) and P0305 (Cylinder 5). Been working on my girlfriends 1996 subaru legacy outback with the 2. Cylinder 4 misfire I have an 01 Legacy GT and keep getting the check engine light for cylinder 4 misfire. 5L, and also soem 2000-06 Legacy and Outback vehicles. Possible causes of OBD code P0304 Subaru A code P0304 Subaru may mean that one or more of the following has happened: Faulty spark plug or wire Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector Burned exhaust valve Faulty catalytic converter(s) Running out of fuel Poor compression Defective computer. Cold engine "bucks" under acceleration. If the spark fires at the incorrect time or not at all, that is considered a misfire. The Misfire monitor diagnostic is based on variation in crankshaft velocity. your next step would be to do a compression check on all cylinders. the best way to diagnose a misfire is to move the ignition coils of those cylinders(4 and 5) to different cylinders to see if the misfire will move. Replaced EGR and cleaned opening. I had the coil pack switched to a different cylinder and the cel stayed on 4. belt one time was like a tooth off and had a Subaru type idle idk if u recently done. A BMW for example is known for being the "ultimate driving machine" but no one equates that with being easy on your wallet, or at least no one should. Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net!. Subaru P0302 Cylinder 2 Misfire Code - YouTube. If I keep accelerating it will throw a misfire code in cylinder 1. Oxygen Sensor Heater Supported Complete EGR System Unsupported Results of On-board Oxygen Sensor Monitoring Tests O2 Test Parameter B1-S1 B1-S2 Unit. The table below is a list of EOBD 'P' Codes. P0304: Cylinder 4 Misfire Detected Subaru - 2-4 brake pressure control. The 2006 Subaru Baja has 2 NHTSA complaints for the engine at 27,500 miles average. Oxygen Sensor Heater Supported Complete EGR System Unsupported Results of On-board Oxygen Sensor Monitoring Tests O2 Test Parameter B1-S1 B1-S2 Unit. If the noid light was installed to the #6 injector harness and only flashed dim,you most likely have a bad. The misfire occurs as a result of a partial combustion process occurring inside one of the cylinders. ) compression and 4. #4 to #2 #1 to #4 #3 stayed put And, it's not just a code since the engine runs bad like a misfire. , CO (2005 Subaru Forester XS 2. Cylinder heads are a vital part of a working cylinder. I've swapped no. It is a possibility the oil could be. The Misfire monitor diagnostic is based on variation in crankshaft velocity. Mods 750 injectors Aem fuel pump Cobb intake Cobb turbo back And stage 3 ots been running the map for only a day as all these parts recently installed. 2005 STI, 113000kms - 70625 Miles Mods: Invidia N1 Catback Exhaust Bought my STI in september and it is starting to throw cylinder 4 misfire codes, you can feel it in the idle only sometimes checked to see if there was foam around the oil cap and there is none, changed my plugs, haven't tried moving the coil packs yet but that is next. She also had a cracked coil body on cylinder 4, so I replaced that recently. While on the highway CEL kept coming on and off. Customers having this concern should have their vehicle repaired using the following repair procedure. FreeAutoMechanic. Cylinder 4 Misfire Detected P0305: Cylinder 5 Misfire Detected Subaru Suzuki Toyota VW. Forum Home. Car runs beautifully if you accelerate 1/3 throttle or more but if you very lightly accelerate you feel a shutter and CEL comes on. Soldered all the connections. Ran diagnostics and found codes P0304 P1414 for cyl 4 misfire and cyl 4 reactivation control performance. If the misfire follows the suspected coil, the failure will lie with the coil rather than the spark plug or PCM's coil driver. The code came back P0303, cylinder 3 misfire. 5L Misfire Posted to Asian Driveability on 4/19/2007 4 Replies Hi, to all Subaru tech, I got cyl 1 no spark from coil pack, are they suppose to be fire on both cylinder?. New timing belt and pulleys. This is a complete PITA with the motor in car. 2005 Subaru WRX/Misfire on Cylinder 1 & 3/Rough Idle Getting a 301 and 303 misfire. It has new coil plugs and wire. She also had a cracked coil body on cylinder 4, so I replaced that recently. (make sure to keep a good record of where you are moving them). Made to post on SubaruForester. The P0304 Subaru code means that the cylinder 4 is misfiring or is randomly misfiring. 2003, 198k miles, overnight 1-6 cylinder misfire codes. Also, make sure you jot down the other codes, as misfire can be caused by a malfunctioning component or system. 1998 SUBARU FORESTER PO301,PO302,PO303,PO304 in sequence but not all at once. I had a buddy call me in a panic today, his 06 wrx limited failed a smog test on his way to sell the car because of misfire codes on all cylinders. theres no coolant, oil level is real high and gross. Other than the flat-four cylinder configuration, my new Subaru's water-cooled OHC engine had far m. All 4 cylinder misfires 1 Answer. Engine ticking or misfires seem to be happening on cylinders 1, 4, 6 and or 7 on the effected engines. Cylinder misfire. com and find specs, pricing, MPG, safety data, photos, videos, reviews and local inventory. My check engine light came on, so I took it to AutoZone to perform a check engine light test. Subaru Engine Misfire Repair in Salt Lake City, UT Every spark-plug in your Subaru is electrically timed to fire at a precise time to deliver power to the engine. I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles. Primary or secondary ignition components can go bad and prevent the spark from being delivered properly to the cylinder which would result in an engine or cylinder misfire. This can set DTCs P0301 No. ) compression and 4. Technical Service Bulletin Transaction No. The DIC now complains about traction control. I replaced the injector, it ran awesome for like h. Regarding a ticking noise or misfire on 2005-2014 GM V8 engines. I went and replaced the spark plugs with some brand new OEM iridiums. So, is Mode 6 data dynamic or a flag that gets set? Testing on Fords indicates that it's dynamic data, which means that Mode 6 shows the misfire only while it's happening, and won't help to identify a cylinder that was misfiring previously. Subaru contends that this is all that is required to "repair" the leaks. its the head gasket. All DTCs that I saw in VIDA were old and unrelated to engine function so I just cleared them out. That is what sets a no activity code as the 02 sensor will read a lean condition due to the misfire. The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. P0302 SUBARU Tech Notes The P0302 code means that the cylinder 2 is misfiring or is randomly misfiring. Incoming search terms: 2019 dodge dakota truck lineup, 2019 dodge truck lineup, 2019 ram 5500 specs, 2019 ram 1500 factory warranty, 2019 dodge journey owners manual, 20. your next step would be to do a compression check on all cylinders. Sold Omni 3-bar MAP Up for sale is a brand new in bag Omni 3-bar MAP sensor (MAP-K-3BAR) straight from Bob at Omni Power. New timing belt and pulleys. ) ignition, 2. It was bad. It recently passed a leak down & compression test, runs like a dream, and has no noticeable misfires whatsoever so it is a bit puzzling as to why it is throwing a code. 5GT that has had all plugs, wires and the coil pack replaced in January. Have replaced coil packs and plugs. Roughness Monitor #4 (#) - Subaru. Learn about this problem, why it occurs, and how to fix it. The PCM determines this information using the crankshaft position sensor and camshaft position sensor. So here is the break down, car hesitates under heavy acceleration once the catalytic converter is hot. Misfire no 4 cylinder / 2005 Subaru Impreza Wagon - Solving Car Problems. Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net!. 005%, CO2 14. This time cyl 4 codes are being read from my plx kiwi that i keep in my car. Diagnosing an Engine Misfire Download PDF. 2004 Forester XT, cyl 4 misfire code been missing off and on last two years new coil, plug, injector on cyl 4. I know those are a little low but not horrible. 1998 SUBARU FORESTER PO301,PO302,PO303,PO304 in sequence but not all at once. Cylinder misfire. 44% and O2 0. Average repair cost is $320 at 58,750 miles. 2006 Subaru Outback Engine Problems. Used 2013 Subaru Outback for Sale. Today I’ll be showing you how to test the Forester ignition coil in your 2000 Subaru. Intermittent Cylinder Misfire Subaru Valve Guide Problem Whenever you remove a Subaru cylinder head you should always look at the valve guides to see if there is any evidence of them moving, particularly the exhaust valve guides. 3 cylinder misfire detected, P0304 No. ) fuel density, 3. to recap, about a month ago, I had a 1,2,3,4 misfire. Apr 09, 2013 · I found something pretty interesting when troubleshooting a misfire on my car and had to effect a clever fix to get by on. Do you have problems with car?. Golf R Rough Idle / Misfire; Cyl 4 misfire code. Misfire on all 4 cylinders Welcome to KC Subaru! If this is your first visit and want to take full advantage of this community, please take the time to register. Original code was a injector cyl#1 open. 8L Engine oemdtc February 20, 2017 November 1, 2017 Diagnostic Tips SSM 46391 – 2017 F-Super Duty / E-Series /F53 Motorhome /F59 Chassis / F-650 / F-750 – 6. The P0306 code is caused by a misfire on the number six cylinder. it is the head gasket, i went to the shop todayhes my friend i didnt pay anything to look at it or anything. With these, you'll most often see "Misfire on Cylinder No. Instead, I went through the entire OBD II code list and picked out codes I’ve seen set in the real auto repair world. My name is David Gorth and I recently experienced an engine misfire problem which may be of interest to some of the AutoTap users. Cylinder misfire codes come only occasionally at either idle or highway speed. 5L, and also soem 2000-06 Legacy and Outback vehicles. Subaru misfire problems can affect 1999-06 Subaru impreza, and Forester 2. Subaru EJ25 engine used the aluminum cylinder block with dry sleeves. Engine ticking or misfires seem to be happening on cylinders 1, 4, 6 and or 7 on the effected engines. In this video i track down the misfire and have the car firing on all 4 cylinders by the end of the video. The engine computer or PCM can detect a misfiring cylinder by monitoring the engine speed. I drive the car for another 150 miles with no further performance issues. P0171 is a very common code for any ODB2 vehicle. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”. To help you understand what might have been the cause of your car misfire, below are the top 5 causes that someone could experience in this situation. 4 earlier as well, and it would seem odd to me that 2 injectors would go at the same time. Yes, I can once again say "Thank You!" for this website, travelvoy. HC 12PPM, CO 0. Misfire count for cylinder #4 as determined by the ECU. Subaru P0302 Cylinder 2 Misfire Code - YouTube. Subaru of London is not a representation of the brand, but a poor example of an independent dealership who does not value it's customer. And there we see it. P0300 Random/Multiple Cylinder Misfire Detected P0301 Cyl. Prior to that it was misfiring on cylinder 6 due to a damaged coil, so that was replaced as well. The car would barely run so I replaced the plugs with oem ngks. I removed the two bolts that held the engine cover in place. Causing this ticking or misfire condition may be the result of an AFM lifter. to recap, about a month ago, I had a 1,2,3,4 misfire. 4 earlier as well, and it would seem odd to me that 2 injectors would go at the same time. Cold engine "bucks" under acceleration. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”. Research the 2019 Acura RDX at cars. Roughness Monitor #4 (#) – Subaru;. Up to about 9 psi of boost its fine, after that the car shudders and dumps boost. 2006 Subaru Outback Engine Problems. 5-L 4 Cyl) but check engine light permanently on for cylinder 4 misfire. Get the best deals on Standard Air Intake & Fuel Delivery Sensors for Mitsubishi Mirage when you shop the largest online selection at eBay. I told him to come over and I'd help him out. I replaced the O2 sensor and the misfire and the fuel trim problem went away. Cylinder 4 misfires at low rpm. Replaced the #2 MDS solenoid, The wiring. I've had the wires, coils, plugs, replaced and the fuel injectors cleaned. Subaru Legacy Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0304 cylinder 4 misfire detected DTC DETECTING CONDITION: • Detected when two consecutive driving cycles with fault occur. This also seems to happen more with my cobb ap tune. Call (508) 778-5066 for more information. I swapped the 2 and 4 coils and I still have a misfire on cylinder 4. As the affected cylinders come up in the rotation, the decibel level of the exhaust note on the misfiring cylinder will drop, followed by a full-volume report as the next cylinder fires. Engine ticking or misfires seem to be happening on cylinders 1, 4, 6 and or 7 on the effected engines. Got my pickup truck and rented a Uhaul Car transporter and hauled it to the Mechanic. Car has 92k miles on it and he paid a Subaru dealer to do the 90k service. 5L Stall, Misfire. How are the misfire codes detected by the ECU? Just a sensor for vibration, or is it some electrical test of each cylinder? In other words, how does it determine which cylinder to flag? Is there a way to probe the connectors? I hate to throw. Had a CEL showing a misfire in cyl 4, so replaced all the injectors, swapped the coil packs between 2 and 4, and replaced the #4 sparkplug. Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. should i replace the stock computer? Additional Details: recently did the coils checked the fuel injectors compression test. Misfires are flagged due to lack of contribution from that cylinder. Read honest and unbiased product reviews from our users. Received bullying lecture from mechanic regarding a misfire on cylinder 3. Regular #3 misfire code, occasional #4 misfire. Average failure mileage is 87,800 miles. We list common check engine light codes for you on this page at the bottom. The other thing I noticed was that the misfire did not come in until the engine speed reached about 1500 RPMs. CEL blinks at low rpm then goes out at around 3000. 4% at idle with the live data list recording 20 misfire counts on number 2 cylinder! One point to note here was the misfire count fell to zero on number 2 cylinder as soon as the engine speed was increased just 150rpm above idle (return to idle, the misfire count began to increase again). The odometer reads 124k, however the engine was replaced, due to a 3rd cylinder misfire, after the engine replacement no issues have occurred. 7l) with 143,000 miles on the car. That combination tends to make me thing crank sensor related issue, istr it is a 2 wire inductive sensor it might be worth checking it out and the associated wiring. Code P0304 (Misfire Cylinder 4) reading on my 2001 Outback with the check engine light on. you can see coolant on top of piston in cylinder 4 and all the brand new plugs were shot. Used 2013 GMC Terrain from Prime Subaru Hyannis in Hyannis, MA, 02601. Subaru Legacy P0304 Definition. All of Subaru's four-cylinder engines (except the EN series) are liquid-cooled, horizontally opposed boxer four-strokes. To help you understand what might have been the cause of your car misfire, below are the top 5 causes that someone could experience in this situation. P0300 Random/Multiple Cylinder Misfire Detected P0301 Cyl. 2007 Subaru Outback. Mods 750 injectors Aem fuel pump Cobb intake Cobb turbo back And stage 3 ots been running the map for only a day as all these parts recently installed. You can do the same test with the spark plug, i. Ran fine before this by the way. If the misfire follows the suspected coil, the failure will lie with the coil rather than the spark plug or PCM’s coil driver. 2003 ford ranger - cylinder 4 misfire detected and misfire detected 1st 1000 rev Can anyone recommend the repair I need to make to a 2003 Ford Ranger pickup truck based on the codes I received when I plugged in my OBDII code reader. Time to get to cylinder #5 coil. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes" Cost of diagnosing the P0304 SUBARU code. I've swapped no. P0304 cylinder 4 misfire and according to the local dealership that is synonymous with this defect, keep in mind the car has only 27k miles, Trouble codes related to this would tell you a possible coil, spark plug, evap leak or egr valve, the dealer confirmed it was neither one and it was the faulty cylinder head. Replied by Andy. Subaru Legacy Engine Problems. They can be very difficult to troubleshoot and expensive to just throw parts at. 656 Pages, PDF Size 14. 8L – Multiple Misfire DTCs – Engine Built On 10-Sep-2016 And Through 15-Feb-2017. The number of times this happens will depend on the seriousness of the misfire. Thanks for watching!. 1 cylinder (1, 3, 5), and the opposite cylinders are in Bank 2 (2, 4, 6). I hope this helps others. New crank and cam sensors. Which is misfiring in cylinder 2,4,6. From time to time I do hear the cam adjusters hitting the cylinder head covers but didn't want to think it could be the cause. This engine ended up having a burned valve, and was causing the misfire. 0 litre engine for more responsive performance. Research the 2014 Subaru Forester at cars. • Changed cylinder 4's coilpack • Removed and refitted the intercooler when looking for the knock sensor but no luck…it's hidden well under there somewhere. The FSM has the valve clearance specs. New to the forumI have a 97 Subaru Legacy 2. Received bullying lecture from mechanic regarding a misfire on cylinder 3. 0 owners will have a misfire CEL. I tested the front O2 sensor. you can also move the injectors around and even the spark plugs. All six-cylinder Subaru 3. 5 SOHC 4-cylinder, 5-speed manual, 120k miles). P0300 Random/Multiple Cylinder Misfire Detected; P0301 Cylinder 1 Misfire Detected; P0302 Cylinder 2 Misfire Detected; P0303 Cylinder 3 Misfire Detected; P0304 Cylinder 4 Misfire Detected; P0305 Cylinder 5 Misfire Detected; P0306 Cylinder 6 Misfire Detected; P0307 Cylinder 7 Misfire Detected; P0308 Cylinder 8 Misfire Detected; P0309 Cylinder 9. The last digit of the code P030X stands for the misfiring cylinder number. Car is misfiring. I had a buddy call me in a panic today, his 06 wrx limited failed a smog test on his way to sell the car because of misfire codes on all cylinders. It's been a long time that I have ran into a cylinder misfire problem that I couldn't just go directly to the source of the problem by some quick preliminary tests. If the spark fires at the incorrect time or not at all, that is considered a misfire. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 4. The automotive technical service bulletin targeted, 1995 - 1998 model years for the Nissan Altima equipped with the four-cylinder engine. , CO (2005 Subaru Forester XS 2. 5L V6, reported a P0301 code through the AutoTap, which indicated a cylinder number 1 misfire. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”. What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net!. theres no coolant, oil level is real high and gross. The misfiring cylinder is causing the "no activity" dtc related to the 02 sensor as when a cylinder misfires,there is alot of oxygen in the exhuast because the fuel did not burn. Subaru flat 4 port and direct injection, non-turbo 2012: Cylinder misfire An intermittent issue of the engine warning light illuminating and fault code "P0302 Cylinder 2 misfire" detected. Also my current MPG is about 21 which is low in my opinion and from what I have seen other people get. So, is Mode 6 data dynamic or a flag that gets set? Testing on Fords indicates that it's dynamic data, which means that Mode 6 shows the misfire only while it's happening, and won't help to identify a cylinder that was misfiring previously. The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Car is misfiring. Ran diagnostics and found codes P0304 P1414 for cyl 4 misfire and cyl 4 reactivation control performance. Got the CEL code read, and its coming up as p0303 and p0304, cylinders 3 and 4 misfires. Engine Misfire: The Most Common Causes. HC 12PPM, CO 0. Subaru flat 4 port and direct injection, non-turbo 2012: Cylinder misfire An intermittent issue of the engine warning light illuminating and fault code “P0302 Cylinder 2 misfire” detected. I received 2 codes, P0304 - Cylinder 4 Misfire detected and P0316 - Misfire detected 1st 1000 revs. This was a replacement for my originally failed sensor. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes". your next step would be to do a compression check on all cylinders. Learn about this problem, why it occurs, and how to fix it. Nissan 4 cylinder engine. Welcome to Mazdaspeed Forums. The odometer reads 124k, however the engine was replaced, due to a 3rd cylinder misfire, after the engine replacement no issues have occurred. It's been a long time that I have ran into a cylinder misfire problem that I couldn't just go directly to the source of the problem by some quick preliminary tests. ) timing failures. the number after the 3 indicated the misfiring cylinder. belt one time was like a tooth off and had a Subaru type idle idk if u recently done. -Code P0304 for cylinder 4 misfire-Oil is normal color and texture, tested before and after an oil change and letting it run for a bit-Exhaust smoke is not discolored-Only seems to misfire when idling, possibly more in reverse I've noticed. com for feedback. The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. New crank and cam sensors. I replaced the O2 sensor and the misfire and the fuel trim problem went away. Hello all, I recently bought a 2007 Toyota Tacoma 4 cylinder (2. Original code was a injector cyl#1 open. Bank 1 has the No. Take away any of those elements, and the cylinder will not produce the expected bang. I looked for leaks but saw no evidence of any. The P0306 code is caused by a misfire on the number six cylinder. I keep getting a misfire on cylinder 2 and 4. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. Multiple Misfire DTCs – 2017 Ford with 6. We have referrals to the history of the car you can see on the Wikipedia. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes". TT00012 Revised Cylinder Head Bolts In 2010 Subaru 2. This time the check engine light and cruise both blink, and after about 5-10 blinks the check engine light stays on. Misfire is a common drivability problem that may or may not be easy to diagnose, depending on the cause. 2 Misfire Detected P0303 Cyl. Found MDS solenoid #2 for cylinder 4 and wiring harness melted to top of the engine block. Subaru misfire problems can affect 1999-06 Subaru impreza, and Forester 2. Diagnosing Misfires Download PDF. New timing belt and pulleys. SUZUKI GRAND VITARA 2001 2. G Owners Manual online. I have a 2003 wrx sedan, manual trans. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 2. Subaru flat 4 port and direct injection, non-turbo 2012: Cylinder misfire An intermittent issue of the engine warning light illuminating and fault code "P0302 Cylinder 2 misfire" detected. I tested the front O2 sensor. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes". Just 2 weeks ago, the CEL came on, with a cylinder 4 misfire; took it in to my normal shop, no problem found. Independent Subaru shop. I did make the mistake of not compression the tensioner piston back in when I had the head off the get resurfaced. 5-L 4 Cyl) but check engine light permanently on for cylinder 4 misfire. Other than the flat-four cylinder configuration, my new Subaru's water-cooled OHC engine had far m. Thanks for watching!. Used 2013 GMC Terrain from Prime Subaru Hyannis in Hyannis, MA, 02601. Do have switching at the Dk/green wire of that coil #4? All pinks are power and return is brown. The P0304 Subaru code means that the cylinder 4 is misfiring or is randomly misfiring. And the scan tool shows a #4 misfire code. A vacuum leak into the intake port of the cylinder in question can cause a lack of fuel. 1 cylinder (1, 3, 5), and the opposite cylinders are in Bank 2 (2, 4, 6). A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. ) fuel density, 3. Had a CEL showing a misfire in cyl 4, so replaced all the injectors, swapped the coil packs between 2 and 4, and replaced the #4 sparkplug. Then the 3 and 4 misfire began. I'm watching the misfires occur on an OFT and cylinders 2 and 4 rack up some misfires, but heavily weighted toward cylinder 2. A code reader, available from parts stores, will permit you to jack into the engine-control unit (ECU) and get a dialog of what's up, what's wrong and where it's happening.