F6 Loss Of Power After Coils/ Sparks And Service

[El Andrew]

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.

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[Mr_4.0]

high flow cat and NO tune = overboost!

[tbomb]

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

[Ralph Wiggum]

ALWAYS

USE












GENUINE
















COILS

[JETURBO]

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

[discostig]

high flow cat and NO tune = overboost!

Also this

Is 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.

[velocityxr6t]

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.

[barnz]

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

It 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...

[Ralph Wiggum]

so creating a boost leak

I believe the term you are looking for is "temporary diagnostic boost reduction"

[El Andrew]

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!

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