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Type: Posts; User: chienlaid

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  1. Replies
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    Re: P0303 Misfire Done a bunch of stuff

    I didn't do a thing. Swapped the injector, started the car and drove it.
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    Re: P0303 Misfire Done a bunch of stuff

    Pretty sure it was whatever they sell at Princess Auto, STP I think, decanted into a mason jar. I know the they tell you that you need to change the o-ring and teflon, but didn't do any of that. ...
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    Re: P0303 Misfire Done a bunch of stuff

    Ended up pulling all the injectors and letting them soak in carb cleaner over night. Put them back in the car the next day. Walnut blasted the valves, just because, don't know if it really needed...
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    Re: P0303 Misfire Done a bunch of stuff

    I didn't do a damn thing. Replaced the old with new and that's it. Probably took the computer a bit to learn, but never noticed.
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    Re: P0303 Misfire Done a bunch of stuff

    Another update on this problem. After running great for a few months P0303 started coming back on and off, especially on cold days. Bought a compression tester, all 4 cylinders checked out...
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    Re: P0303 Misfire Done a bunch of stuff

    Just an update. After a running seafoam in the gas tank a few times, the check engine finally went off and has been off for over a month now. I think I had a combination of dirty intake valves and...
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    Re: P0303 Misfire Done a bunch of stuff

    Yes sorry that's what I meant....they are saying that piston#3 has either worn or broken rings. I just bought a USB borescope camera...I think I'll drop it inside and take a look and see what it...
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    Re: P0303 Misfire Done a bunch of stuff

    Quick update on this whole situation. Check engine came back on, then went off again, car ran fine....engine light came back on last week and my wife lost it, drove the car to the dealership and...
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    Re: P0303 Misfire Done a bunch of stuff

    No it wasn't but it was pretty close.

    The snorkel wasn't the problem, the check engine light came back on yesterday with the same P0303 code. Drove it for a while and it went away again.
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    Re: P0303 Misfire Done a bunch of stuff

    Very interesting! I have no clue what the hell was going on then and why when I reinstalled it it started running better.
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    Re: P0303 Misfire Done a bunch of stuff

    Yes they took the whole airbox off, plus the intake manifold to clean the intake valves. The engine light came back on 2 days later. I didn't bother scanning the code, assuming it was still P0303,...
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    Re: P0303 Misfire Done a bunch of stuff

    So I get in the car last night after to work and I immediately notice that it's not running properly. It was really sluggish, it kept shifting up too fast and the car was bogged down, step on the...
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    Re: P0303 Misfire Done a bunch of stuff

    It feels sluggish until you hit around 4K rpm then it pulls better. But idle and low rpm's it runs rough.

    I'm thinking it's a bad injector or clogged injector.
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    Re: P0303 Misfire Done a bunch of stuff

    So here's an update. Brought the car in to the Sudbury Mazda dealership on thursday...took them half a day to complete the work. Walked out of there with a $450 bill, worked performed: remove...
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    Re: P0303 Misfire Done a bunch of stuff

    Yeah the head will probably come off and be de-carbonized.....all i have to say it better f**** work when I get it back. I put half a can of seafoam in the tank last fill up and drove the crap out...
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    Re: P0303 Misfire Done a bunch of stuff

    Sorry yes.....I pulled all the plugs and I had gapped them wrong. Regapped all the plugs according to the Mazda owner's manual. Cleared the Check engine light, ran really good for about a week,...
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    Re: P0303 Misfire Done a bunch of stuff

    Thanks for all the suggestions. I'll work on it this weekend and post an updated.
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    P0303 Misfire Done a bunch of stuff

    Hello everyone,

    Long time lurker...finally decided to post. I'm at my wits end with our 2012 Mazda 3 Hatchback GS Sky. Car has 124000Km on it and P0303 showed up about 2 months ago, figured it...
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