V6 help needed, rough running
As the title suggests my V6 is running rough. PHASE 2 (Fly by wire TB )
The symptoms are, very flat when cold like its not running on choke for the older generation !
Very erratic idle (its always been a bit poor but never seemed to affect the overall running)
It feels like it wants to kangaroo a bit when on the over run, that's the only way i can describe it, when you accelerate hard it revs upto the limit and feels nearly right if you know what i mean .
All a bit vague i know but i have done a lot of research on the forum and have some ideas of where to go but any suggestions would be MOST grateful.
What i have done recently to try and get to the bottom of it:
Attached the diag and nothing obvious stands out, all seams okay.
Had new left hand Lamba sensor last year and new right hand one a few weeks ago (genuine Bosch)
Had new genuine MAF 6 months ago (this seemed to help but I'm convinced this only masked the real problem as its now running just as rough again,)
Removed all the flexi pipe work to the throttle body and replaced with silicone, so no leaks .
Cleaned every connector with electrical spray and resealed.
New plugs were fitted three years ago when it had the belts done so i doubt its them.
I was thinking of changing the water temp sensor but the engine temp seems within tolerance when running live data on Muliscan, whats your thoughts and which sensor relays info to the ECU ?
I'm almost getting to the point of taking it to Alfatune but problems like this can turn out to be difficult to diagnose and VERY expensive .
I WOULD APPRECIATE ANY IDEAS !
Forgot to add, could it be a knackered TB ? is the IAC valve built into the TB ?