Driveability and Running Conditions

Please report if you experience any of these :

Range Rover 4.0/4.6

^ Cold driveability/hesitation may occur with oxygenated fuel or when fuel volatility changes in the spring and fall to meet government requirements. A vehicle may require several days to adapt to the different fuel. Always encourage customers to use a reputable brand of fuel as this will minimize the likelihood of a problem.

^ For sticking exhaust valves (small number of vehicles to date) a rougher than normal idle is accompanied by vacuum fluctuations (normally a steady 14 inches at idle).

^ Check for vacuum leaks (i.e. intake manifold bolts to head are tight).

For the following, please contact the HelpLine with information.

^ Stalls on first start of the day.

^ Stalls on selection of gear or maneuvering in cold ambients in the morning.

^ Slight hesitation on cold driveaway.

^ Intake popback on acceleration following deceleration when cold.

Discovery

^ Rough running, check that the oxygen sensors have proper upstream harness connections. Correct orientation should be odd bank connected to red harness connector and even bank connected to black harness connector.

^ Upstream oxygen sensor harness connectors are secure.

^ Check for sticking exhaust valves (small number of vehicles to date) a rougher than normal idle with accompany vacuum fluctuations, normally a steady 14 inches.

^ Check for vacuum leaks and that all intake manifold bolts to head are tight.