S/C 4.2L petrol 60K miles

For a while now my car has been idling rough on cold morning starts until it reaches normal operating temperature (about 6 mins).

On a cold start (car been left overnight) this is what normally happens :- the engine starts fine, initial RPM about 1200, as soon as I select reverse (to reverse out of garage) idle drops to about 600 rpm and remains at 600 (even in N or P). The engine then starts to 'hunt' ie almost stall (but it doesn’t actually stall), body also vibrates quite a bit. I drive away and the rough idle continues until the engine reaches normal operating temperature. On reaching normal engine temperature the idle becomes smooth at about 650 rpm

This morning however the engine ‘hunting’ and body vibration was quite bad and after about 60 seconds of driving I received the Engine Reduced Power warning (and the engine did loose power), so I pulled over, plugged in my generic OBDII code reader and read the following error code P0160 and 2 pending errors P0161 and C3200. I cleared these faults started the engine and continued my journey (40 miles) no further errors.

The problem is I can’t seem to find any details on these errors i.e. generic code reader says manufacturer specific. Any ideas?

I have recently changed the plugs and air filter, but this didn’t seem to make any difference

Known issue:

Quote this TSB at your service dept:

Quote:

No: LTB00197
Issue: 1
Date: 26 JAN 2009

CIRCULATE TO: Service Mgr Warranty Workshop Body Shop Parts

NOTE: The information in Technical Bulletins is intended for use by trained, professional Technicians with the knowledge, tools, and equipment required to do the job properly and safely. It informs these Technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by 'do-it-yourselfers'. If you are not a Retailer, do not assume that a condition described affects your vehicle. Contact an authorized Land Rover service facility to determine whether this bulletin applies to a specific vehicle.
©2009 Jaguar Land Rover North America LLC

SECTION: 303
Poor Engine Cold-Start / Stumble - Repair Procedure

AFFECTED VEHICLE RANGE:
Range Rover (LM) Supercharged only VIN: 6A194480 - 6A239036 Model Year: 2006
Range Rover Sport (LS) Supercharged only VIN: 6A900129 - 6A983117 Model Year: 2006

CONDITION SUMMARY:
Situation: The engine may be hard to start or stumble when cold. This may be caused by sensitive Engine control module (ECM) calibration.
Action: In the event of a customer concern of the above, refer to the Repair Procedure below to reconfigure the ECM, check the Transmission control module (TCM) software, and if necessary reconfigure the TCM.

PARTS:
No parts necessary; information only

TOOLS:
IDS with latest DVD Patch File; software first available on DVD115 Patch File 9
Midtronics PSC-550 Vehicle Power Supply

 

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Thanks shmoogle.

I have already had that IDS patch applied back in March 2009. Unfortunately for me it made no difference.

However just noticed that LTB00197 January 20th has been superseded by LTB00197v2 dated 9th September 2009. Requires IDS 118.5 with patch file 13.

My vehicle has not had that update applied, maybe this will fix it.

Ah, OK - that might be worth a go then. Let us know if it fixes it  

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