Question about 1998 Honda Civic

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Multiple misfirings.changed distributor to a new.same problem any ideas 3months ago i had the same problem changed the plugs and wires and it worked fine until now. Codes read : p301p303p300p1399 any help is appreciated

Posted by Anonymous on

  • Carmen Sandiego
    Carmen Sandiego Feb 19, 2014

    I was having a similar problem recently. No matter what I did, I couldn't seem to fix the problem on my own. I finally decided I had better swallow my pride and ask for help. I finally took my car into the shop and they told me I needed a new carbon brush for my motor. http://www.electricmotorparts.net/carbon...

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The codes are cylinder misfires. Take out pug number one. Really look at it. Is it glazed as if if it has been running really hot? If so the other plugs will likely all look the same. What I think is happening here is that the combustion temperatures are high and this is over heating the plugs causing misfire events. Systemic very high combustion temperatures are caused by a blocked EGR Exhaust gas recirculation valve passage way. The EGR passage way assembly is located in the valley between the injector assembly and the intake manifold. You need to remove the three 10mm bolts that hold the injector rail in place and ease the injectors out. Rotate the rail over to the right (as you face the engine) and hold out of the way with a piece of wire. Remove the 4 or 5 bolts along the length of the EGR assembly and lift it out. Use a blunt screwdriver to scrape all carbon deposits clean and any ports on the exhaust manifold need to be reopened. Use a vacuum cleaner to **** out all the debris and maybe use some carburettor spray cleaner on a cloth to get it like new. Use a touch of silicon grease on the contacting surfaces when reinstalling the 'clean' EGR assembly to prevent air leaks, likewise on the 'o' rings on the injectors. Make all re-connections air tight, ensure all bolts are tightened and all wires fitted back into the sensors. This should sort it

Posted on May 10, 2010

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Are you using a lot of oil? have you been low on coolant lately? if you answered yes to any or both of these questions then the car probably has worn valve guides and fouling out the plugs or you could have a weak head gasket that is letting water into the cylinders and causing misfires. or if you answered no to both questions and you said you've already changed out the plugs and wires and all the coil packs then the only thing left would be the engines computer causing these random misfires. Disconnect the negative cable from your battery! now look for your computer..i"ve heard that yours might be located under the floor on the passenger side or up near that area, well wherever it is, have someone take the connectors off (don't touch the pins with you fingers you could have static and that will fry the computer), and inspect for corrosion on the pins...if they are corroded then purchase some electrical contact cleaner or just spray a "little" bit of wd-40 inside and connect and disconnect repeat... should clean up the connections a little better..i had found that my cars was acting weird like it was cutting out or like something was wrong with the transmission so i inspected the computer and found one of the two connectors was really corroded bad, so i just spray cleaned it up, and reseated the connectors, and it seemed to run a lot better. i dont know if the cleaning actually fixed it.. or having the computer disconnected reset the problem, but you could try this. But one thing you might notice that everytime the battery is disconnected for awhile and then hooked back up the computer has been reset and will have to acquire new setting from all your sensor from the engine so it my take a couple of miles or a days worth of driving for it will return to normal. One more thing to do is take out the plugs and clean them up with a wire brush and check the gaps then reinstall, dont torque them down! if they have a gasket its a 1/4 turn tight, and if no gasket its a 1/16 turn, believe me you dont ever over torque a spark plug and always use the stock plugs...because if you dont, you can cause damage to the engine... because the reach was too long or you used the wrong temp plug for the cold season or warm season.. so nothing fancy, just ask for the cheapest normal stock replacement plugs and you cant go wrong. and they dont come pre-gapped like you hear most people say and i know for a fact because last week i did mine and they were all off by .003. if the sticker under the hood of your car says it .045 then i usually gap it .001 under so by the time the plugs are a quarter of the way through its life, it'll be at .045 and then the next quarter, it'll be at .046 then it'll almost be time to change plugs again. I never go more than that, i've never had problems with this technique. i hope some of this info will help please let me know..and if i've helped you fix this can you rate my answer. Thanks!

Posted on May 10, 2010

  • steve t May 10, 2010

    oh and another thing if this is a four cylinder and the plugs go down straight through the top of the valve cover like on my old Saturn i just remembered that i used to get this same old kind of misfire and it was from two plugs that had a buildup of oil down inside because of my leaky valve cover gasket,,, about every two months or so if it started misfiring, i would have to pull out the plugs and let the oil drain into the cylinders and wipe or spray clean the wires real good, and reinstall, because the oil was getting the plugs wet.So if you have a four cylinder, take wires out and use a flashlight and look down in there for oil accumulation and that's whats probably causing the misfires that comes and goes after you change the plugs. you can fix this easy you just have to change the valve cover gasket thats what i did and problem solved no more misfires.

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