El Andrew Gold Donating Members 2,035 Member For: 9y 7m Gender: Male Location: Canberra ACT Posted 25/09/15 02:16 AM Share Posted 25/09/15 02:16 AM Couldn't quite understand from above whether you have tried different coils or not (so apologies if this is useless), but I recently had an issue where genuine coils gave up the ghost. Was same issue - misfire at about 3500rpm. Mechanic put no-name ones in and same issue kept happening. I put NGK in and sorted the problem. With the cheap coils, if I loosened an intake hose (so no boost) misfire went away. So basically coils were ok until under load and boost. My theory is that genuine coils died because of age. Cheap coils were ok for standard applications, but not for creating sufficient spark with increased air pressure under boost. They were no better than aged genuine coils. Good quality coils then sorted the issue. Maybe now your exhaust issues are sorted and everything breathing properly, your coils are suffering same issue. This is in a BA Turbo. Hope it helps. Sent from my SM-N9005 using Tapatalk Link to comment Share on other sites More sharing options...
Mr_4.0 Member 1,096 Member For: 13y 10m 3d Posted 25/09/15 02:24 AM Share Posted 25/09/15 02:24 AM high flow cat and NO tune = overboost! Link to comment Share on other sites More sharing options...
tbomb New Member 19 Member For: 9y 2m 7d Posted 25/09/15 02:34 AM Author Share Posted 25/09/15 02:34 AM (edited) Thanks mate. yeah when the exhaust was blocked and the car wasn't breathing I had no missfire,mind u this was after a coil and spark change aswell. So 6 new aftermarket coils and 6 NGK plugs were installed. Like you said now the car is breathing again I have the missfire issue under load. Looks like my next step is to put genuine coils in ? I have also been told maybe starving for fuel ? Edited 25/09/15 02:38 AM by tbomb Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 1m 30d Gender: Male Location: Perth Posted 25/09/15 02:37 AM Share Posted 25/09/15 02:37 AM ALWAYSUSEGENUINECOILS 3 Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 5m 22d Gender: Male Location: Adelaide Posted 25/09/15 02:40 AM Share Posted 25/09/15 02:40 AM Yeh mate you want genuine ford packaged coil packs They look like this as I had to buy some for a customer at the start of the week Link to comment Share on other sites More sharing options...
discostig Manual mode ________________________ All day, erryday Donating Members 13,798 Member For: 16y 11m 29d Gender: Male Location: Probably above atmospheric pressure Posted 25/09/15 05:16 AM Share Posted 25/09/15 05:16 AM high flow cat and NO tune = overboost!Also thisIs the exhaust possibly flowing more now than before the cat collapsed? Get genuine coils in and have it checked on a dyno by someone with a good rep with these cars. Link to comment Share on other sites More sharing options...
velocityxr6t Member 122 Member For: 16y 9d Gender: Male Posted 25/09/15 07:23 AM Share Posted 25/09/15 07:23 AM I think those spark plugs have a gap of 1.1mm.... needs to be taken down to .8mm at most. I put these in my car recently, forgot to gap them because I'm dumb like that. Regapped them to .8 the next day and all good. 2 Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 2d Gender: Male Location: Brisbane Posted 25/09/15 07:32 AM Share Posted 25/09/15 07:32 AM Couldn't quite understand from above whether you have tried different coils or not (so apologies if this is useless), but I recently had an issue where genuine coils gave up the ghost. Was same issue - misfire at about 3500rpm. Mechanic put no-name ones in and same issue kept happening. I put NGK in and sorted the problem. With the cheap coils, if I loosened an intake hose (so no boost) misfire went away. So basically coils were ok until under load and boost. My theory is that genuine coils died because of age. Cheap coils were ok for standard applications, but not for creating sufficient spark with increased air pressure under boost. They were no better than aged genuine coils. Good quality coils then sorted the issue. Maybe now your exhaust issues are sorted and everything breathing properly, your coils are suffering same issue. This is in a BA Turbo. Hope it helps. Sent from my SM-N9005 using TapatalkIt is true that they do tend to fail under higher loads (boost) due to spark being weak so creating a boost leak to diagnose sh*t coils is actually not the dumbest thing ive heard...not fool proof but not bad either... Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 1m 30d Gender: Male Location: Perth Posted 25/09/15 07:38 AM Share Posted 25/09/15 07:38 AM so creating a boost leak I believe the term you are looking for is "temporary diagnostic boost reduction" 1 Link to comment Share on other sites More sharing options...
El Andrew Gold Donating Members 2,035 Member For: 9y 7m Gender: Male Location: Canberra ACT Posted 25/09/15 07:56 AM Share Posted 25/09/15 07:56 AM Haha except in my case it was more of an "accidental boost reduction". Had everything off trying to diagnose a faulty coil, put it back together and missed a clamp. Went for a drive and blew a hose off, then noticed the problem had gone! Sent from my SM-N9005 using Tapatalk Link to comment Share on other sites More sharing options...
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