Hi guys I did a recent gearbox oil change as I was experiencing the cattle grid effect at 50 to 60 MPH. I am now experiencing a fluctuating revs at between 1500 to 2000 up and down no loss of power though! I have checked the injector wiring this seems fine and when I’m stationary with car in drive with foot on brake I get no lunging forward or a fluctuation in RPM. The car idles fine and no shuddering in reverse either. I did recently get this fault codes
PCM-Engine TD6

P0380-80 Glow plug relay failure - glow relay defective
P0401-20 extended fault path exhaust gas recirculation governor deviation - negative deviation
P0314-01 Cylinder balance control - I-component deviation outside limit - General failure information - general electrical failure
The 2nd fault code I’m sure relates to an EGR deletion and the 3rd fault I cleared it and havnt had it back for over a week and car still running rough. Any ideas guys much appreciated.
Cheers
J Range Rover Vogue SE 4.4 SDV8 SVO Stying Pack
Audi A4 2.7 TDI S Line Black Edition phantomn black
Previous Cars
Range Rover Vogue SE Overfinch Styling 22" Elara's full black stealth colour coded
Java black Range Rover sport 2.7 TDV6
Alaska white Range Rover sport overfinch 3.6 TDV8
BMW M3 Carbon Black

Have you changed the Crankcase breather recently?

Jim

Hi Jim on my last service about 8000 miles ago yes worth a look at it I suppose I might try some injector cleaner also see if this changes anything. Range Rover Vogue SE 4.4 SDV8 SVO Stying Pack
Audi A4 2.7 TDI S Line Black Edition phantomn black
Previous Cars
Range Rover Vogue SE Overfinch Styling 22" Elara's full black stealth colour coded
Java black Range Rover sport 2.7 TDV6
Alaska white Range Rover sport overfinch 3.6 TDV8
BMW M3 Carbon Black

you have my same problem, have you solved?