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miss fire


Theviper1987
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Right ms1 question. Iv recently developed a miss fire I can't trace.. iv replaced the spark plugs, ht leads, coil packs.iv checked the timing more time than I can count. And it still only sounds like it's running on 7 lumpy when revving and flat while driving. With the engine running on tick over u can pull every ht lead of individually and it doesn't make it run any worse. Any ideas would be greatly listened to. Thanks

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Classic symptoms of a worn-out camshaft; however; you say it is misfiring.

What type of plugs are you using? A poor plug can produce good enough spark for idle but not for higher revs. I use NGK Iridium and never have problems anymore, although I did have a newish one fail once.

Have you checked that the injectors are getting current? How long since they were cleaned?

Good luck,

Cheers Charlie

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You've tried pulling the HT leads, try the same thing with injectors see if one of those makes the difference or not. A misfire is definitely a problem but being a bit "flat" could just be your tune, so worry about that separately, fix the misfire 1st.

A datalog from megatune could be useful - just a few seconds of it idling badly might show something useful (or rule out a few things).

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Low battery/poor earth causing the relay issue, and possibly affecting the injectors with same bad earth. Possible dead plugs due to previous overfueling -check and swap them all out if black/wet, stick them in the oven for 20mins at 150C if you have no spares :)

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It's developed now. It won't even tick over now. Iv tried another ecu with my map on it and it still won't start. When u crank it now the fuel pump relay clicks on and off

Does it do that rapidly or at a steady ~2 second interval? Because 2 second interval means the ECU doesn't like the settings - possibly it's running a different version of firmware or there's a conflict or error in the settings.

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If you've burnt settings into it with a flat or less than great battery voltage it can get corrupted as it doesn't burn properly, charge the battery up & try re-burning your last good settings file into it. Usually megatune will warn you "controller voltage low" or similar if there's a risk.

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hi all again. iv tried another EDIS-8 and reset my setting to what nige sent me. still the same.

iv done a datalog thingy using megatune but cant open it.

also I cant upload it. it says 'Error you aren't permitted to upload this kind of file'

any ideas im at my whits end. thanks

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