Rough Idle - Have Tried Just About Everything - Stumped!

[NickBA-XR6T]

OK so I have done:

Spark plugs

Coils

Fuel filter

Fuel regulator

Throttle body

Checked for vac leaks

Reset ECU

O2 sensor with genuine NTK

I cannot find a reason for my bad idle which consists of a constant miss. Can anybody suggest anything else I am all out of money and patience.

Regards

Nick

And the throttle body was a complete replacement with TPS.

[Ralph Wiggum]

bent rod

[NickBA-XR6T]

I was thinking injector issue over bent rod? It is stock boost can't imagine a bent rod.

[bionicxr6t05]

Could be injector, carbon buildup on valves, bent rod, jumped timing

Ford can do a cylinder balance to identify which cylinder it is or you can unplug coils one at a time

A damaged piston/headgasket/valveseat can also cause this

[BigAl's04]

Triple post= Banworthy

[bionicxr6t05]

Lol my mate jack is slowing my brain

[BigAl's04]

As long as he's a Gentleman.

[BRK]

Nothing cheap to check anymore. I assume you have checked all clamps etc? You can start the T with the air intake off it (remove the cross-over and just have the throttle body exposed) That eliminates the turbo, and associated pipes - cooler - and air system. Start it but Don't rev it up. If it still misses, we get down to an injector or a head gasket as a next step. A compression test is where I would go first. That is not money badly spent because you will then know what the engine is like. After that, (if no good)- to the dealer and they should be able to advise which cylinder is "lost."

Good luck - {my idle issue was a plug and a coil....... naturally they were not on/in the same cylinder so it was plugs/coils/........... clean throttle body is regular servicing.}

[old_mate]

Has it spat out any codes? Were the replacement coils genuine Ford?

[NickBA-XR6T]

The codes were lean bank 1 which a genuine o2 sensor fixed and idle air control under speed so I replaced the throttle body. Having the codes reset today. Still didn't fix my idle though. I'm thinking it may be a bad injector.

The engine has only done 125,000 and under load it seems to go well. The fuel consumption is up around 16.8l/100 which is high considering I don't thrash it everywhere. I doubt its a head gasket as no oil in the water or water in the oil etc. My gut tells me its a manifold leak should I have someone do a smoke test on it?