hey guys,

Well I had a cold misfire that got progressively worse. It would run like crap in the morning when I start it, it sounded and felt like it was running on 7 cylinders. The problem would completely go away when warmed up. The truck runs great when warm and I was able to get close to 800km on my tank all highway. I changed the plugs which were very old motorcraft with ngk. The misfire persisted, I traced a misfire down to one of the coils and changed them all with Graneteli hot streets. problem still there only when cold. I decided to yank everything apart changed head gaskets and all other top end gaskets cleaned a very dirty intake manifold with clogged egr ports into the tb. put it back together with new ford plugs. The problem is STILL THERE.

The truck never threw codes for the misfire i felt, codes were for egr flow insufficient. and codes when the one coil went bad. after i fixed everything the egr codes were gone and no codes for misfire even though it was barely driveable when cold. seriously a electric scooter could out accelerate this thing in the morning. couple days after the head gaskets n such got cyl 1,4,5,7 misfire codes but wasnt when it was cold. Cleared the codes and they havent come back for two days.

The truck has been off roaded hard but very well maintained. I dont know what my next stepgs are. I spend so much is gas warming it fully up every morning in the driveway and i only have to drive to school 5 mins away its bs. Somebody please any ideas of what other components could cause this ??

 

could the egr cause this? no codes for egr since I unclogged it but It wouldnt surprise me if there was still a problem there.

 

It could be a few things:
#1 is furthest from the fuel pump. So could be a filter or bad pump.
Ford engines are picky about plugs: the ngk's could be giving you trouble
Bad COPs

I'd start with new COPs and go from there. Make sure to use dielectric grease on the boots.

 

I replaced plugs with the motorcraft platinum plugs its supposed to have. The cop are brand new granetelli hot streets. Replaced the gas tank last month with a clean unit from southern states and cleaned it very well with new fuel filter.

Dielectric grease on the plugs

My truck is still in the

 

thanks for the reply otto

The ngk plugs that came out looked good as far as clean burning but one of the plugs had a bent tip. it may have been bent when the heads came off or when I cleaned the head afterwards. I dont think anything could have hit the spark plug in the engine with it still running great soon as shes warm. correct me if im wrong.

Could anything internally mechanically wrong be causing these symptoms?

250kms on motor but inspected everything when I took it apart looked fine.

 

anybody else? I cant go on like this and I really dont wanna buy this toyota my uncle found me ...

 

well the motor is pooched the oil pressure is dropping off when warmed up and the noises in the cold only got worse. I added some 15-40 to my regular mix to thicken it up a bit and stopped the oil pressure from bottoming out at idle but the pressure was 70+ on startup!! anyways getting a new motor after taking the 4.6 on its last journey to pickup a new one