Xocomil Posted February 24, 2020 Share Posted February 24, 2020 I have a 2005 Legacy 2.5i non-turbo. Starting yesterday the engine started hesitating a tiny bit on acceleration while my wife had the car. That evening she noticed the engine light went on and the cruise control light started flashing. I went to a parts store today and they pulled a code - P0303. Misfire in cylinder 3. After hearing the cars issues, the parts person said most likely plugs, plug wires, or ignition coil issues. The code is off now, but the car continues to hesitate when under load - more noticeable when accelerating in 1st gear. Idle is fine. Starting seems ok too. I bought the car 6 months ago from a family member. It has 150,000 km. The head was redone (with new plugs) around 90,000 km - so 60,000 km ago. Not sure if plug wires were replaced but they look to be in ok condition. I removed the #3 plug today. I've attached a few photos if someone could give their opinion. I'm thinking to buy new NGK OEM platinum plugs at around $9.99 CDN each. If that doesn't solve the issue perhaps I should replace the plug wires? A diagnostic seems to cost a few hundred bucks, so I thought why not replace the plugs before going that route? Thanks for any / all advice! Link to comment Share on other sites More sharing options...
Berge56 Posted February 24, 2020 Share Posted February 24, 2020 I would start with plugs and wires. They are relatively cheap and it should be replaced anyways. Swap those and report back. To test the coil you could pull the plug wire for the cylinder in question and hook it up to an old spark plug or a new plug before you install it. Have the metal hook part of the spark plug touch some sort of metal on the engine and have someone turn the car over to see if that plug sparks. Link to comment Share on other sites More sharing options...
NORULZleggy Posted February 24, 2020 Share Posted February 24, 2020 Had this happen on my 08 2.5i twice and it was plugs. I went with NGK iridium plugs. Car ran great after. The second time it would do as your did, then I got NGK plug wires off amazon for 47, and new plugs, along with changing out the coil, and cleaned the MAF, new air filter and the car was set. the cool thing about the 2.5i is they are great driver cars and highway cruisers. Rock Auto was my friend also. Link to comment Share on other sites More sharing options...
Xocomil Posted February 24, 2020 Author Share Posted February 24, 2020 Thanks guys. Platinum OEM NGK plugs ordered. The iridium were same price, but I read that they might not be best for 2.5 SOHC engines as they're designed for higher compression turbo engines. Link to comment Share on other sites More sharing options...
Stphnhrrng Posted December 31, 2020 Share Posted December 31, 2020 did that fix it? I have the same code in my 08 legacy, 2.5 non turbo. has new ngk wires, replaced plugs and coil pack. Still have the cylinder 3 misfire code only Link to comment Share on other sites More sharing options...
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