randominbread Posted December 6, 2010 Report Share Posted December 6, 2010 I had a miss fire on my Renault megane 3 weeks ago so I replaced number 2 coil and the fault cleared. On saturday coil pack number 3 failed on me. My megane uses a sequential multi point injection system but are the coil on plugs, sequential or do they work on a wasted spark principal? The Haynes book of lies doesn't give that information. Also, are coil-on-plugs to be replaced as a pair or was I just unlucky? Hope someone can shed some light on this, many thanks. Richie Quote Link to comment Share on other sites More sharing options...
Tony Posted December 6, 2010 Report Share Posted December 6, 2010 I'll ask Barb's at wim to look into this tomorrow. Quote Link to comment Share on other sites More sharing options...
dazz33 Posted December 8, 2010 Report Share Posted December 8, 2010 I know when i had my Lexus IS that the coilpacks used to go in pairs as a rule.....im guessing the ignition system will always find the next weakest one.? Quote Link to comment Share on other sites More sharing options...
CIH Posted December 8, 2010 Report Share Posted December 8, 2010 Ideally you'd repalce them as a set. Also, get Denso. I use to work with a dude who had worked at Renault for like +25years and he would replace them in anticipation of a failure if they weren't Denso. I think the other manufacurer may have been Siemens ? Quote Link to comment Share on other sites More sharing options...
randominbread Posted December 9, 2010 Author Report Share Posted December 9, 2010 Well you're not going to believe this but coil-on-plug number 4 has just failed! I can't believe 3 of 4 failed in 3 weeks! I replaced the other 2 with whatever I could get my hands on quickly but I'll get a complete set of Denso's in that case. Many thanks for the advice Richie Quote Link to comment Share on other sites More sharing options...
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