mellonman Posted October 10, 2012 Share Posted October 10, 2012 My car sometimes has a bad missfire if it has not been driven for a week it seems worse,The miss happens light throttle even idle for the first 5 minutes after its warm its fine but some times will have a miss on the first WOT at full boost like fuel cut,then it would be completely fine for another week or so, i have a single turbo and have changed plugs fuel pump and filter coil pack clips are new ish i have super spark coils at abit of a lose now as its quiet intermitant im thinking its an electrical problem could this be the fuel pump ecu i know this to not want to power my walbro 400 so have done a 12v mod but still use the ecu to control a 12v relay ? could this be a ignitor pack on its way out? Quote Link to comment Share on other sites More sharing options...
TT Paul Posted September 25, 2013 Share Posted September 25, 2013 bump this back up as i have a very similar fault anyone know/or fixed it Quote Link to comment Share on other sites More sharing options...
mellonman Posted September 26, 2013 Author Share Posted September 26, 2013 Paul this may well save you a wedge of cash http://www.mkiv.co.uk/vbb/showthread.php?289482-cold-misfire-*updated*-HELP read it all as there maybe relevent help for your car !! to be fair i also changed back to a hotter grade plug as well ngk7eix , some im not 100% if it was a bad plug in the end? also the cam position sensors was full of oil and i cleaned them all up which my of helped Quote Link to comment Share on other sites More sharing options...
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