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P0303 troubleshoot check engine help

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Old 03-14-2012, 03:23 AM
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P0303 troubleshoot check engine help

well i just recently got the check engine light on my 01 prelude took it to autozone to get it checked out and i got the P0303 troubleshoot and P0401. the P0401 was my egr valve i replaced and my check light was still on so the P0303 says the cylinder 3 is misfireing which im thinking it either has to be a vacuum leak, spark plugs, or dirty fuel injecters. Is there any easy ways to check for vacuum leaks i heard using smoke to find the leak and or carberater cleaner but i heard if sprayed in the engine when hot it will flame up. any help or advice will do thanks fellow luders
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Old 03-17-2012, 10:22 PM
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Re: P0303 troubleshoot check engine help

Check the plug on 3....if it has any unusual wear like the contact is worn more than the other ones you might have a cylinder issue...if not...try replacing that plug and that wire or doing a tuneup with plugs, wires, dist. cap and rotor button
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Old 10-02-2012, 10:46 PM
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Re: P0303 troubleshoot check engine help

did the tuneup fix your problem? my 98 sh just threw the p0303 code tonight after a long and chugging start. took a few times to start up. kept cluggin like it was not building pressure.
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