Misfire issues

[mike1498]

2017 model. Constant misfires especially under pressure. Ford shop couldn't figure it out even with the regional techs help. They replaced the catalytic converters, fuel rails, plugs. I had already replaced the coil packs. They said the injectors were fine but I just replaced those. Said its not the cam phasers but I have no faith in them since they had it 14 weeks. Anyone have any ideas?

 

[Hamfisted]

How many miles on it ? Is it setting any codes at all ? Fuel pressure ?
Did they look at the VVT solenoids and cam timing at all with the IDS software ?

 

[mike1498]

138k miles. Throwing codes for cylinders 4,5,6 plus others. Not sure if they looked at the solenoids. Said cam was normal. Fuel pressure seems to be looking good. Mainly looses power when you put in gear and apply pressure to it. Seems as if turbo is acting up as well but that could be part of the misfire issue.

 

[GaryB]

so, it's one bank, not the whole engine...how did they conclude that the cam phaser was OK? Wondering if they even checked the signal with a scan tool or oscilloscope. That's a lot of expensive guesses. They really ought to be ashamed.

 

[ediddily]

Check your ignition coil harness plug connections. I had a loose/unplugged one and wouldn't accelerate properly while giving shuddering. Check plug condition. Time to replace? Can you trust the shop you bring it too? Maybe they have a few screws loose and left some of yours loose intentionally so you keep coming back. Check ignition coil boot condition. Cracked/deteriorated boots will ground your spark and not ignite properly.
Sometimes its the most simplest things that make the biggest impacts.