2001 Land Rover Discovery Series II Logo

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Posted on May 06, 2009
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2001 Land Rover Disco SII 1) Vaccum from the EGR valves when idling (also one leaking) ?Causing exhaust pump to work improperly 2) Cruise control does not work 3) Inside lights, clock and electric locks do not work until SUV is turned on.

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  • Expert 149 Answers
  • Posted on Feb 22, 2010
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2 is being caused by 1 if this is a V8 as it's a vacuum system.
Not sure about 3.

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1answer

2000 Land Rover Discovery 2. I cannot find a leak detection pump but get a P1451 and P1481 code. Could this be the solenoid for the charcoal canister vent in the engine bay giving me the issues?.

Question edited for clarity.

My late mother worked at the Land Rover plant in Solihull and put careful miles on a Disco when it was known as the 'J Car'. Also the first Vogue with a turbo. Long time ago!

Information and videos on both codes.

https://www.google.com/search?q=2000+Land+Rover+Discovery+2+P1481


https://www.google.com/search?q=2000+Land+Rover+Discovery+2+P1451

..
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2004 land rover freelander idle air control valve location?

there is 2 valves and are located on the rear of engine on the left has you look from under the hood
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Common problems with disco 2 year 2000. thanks v8

Hi welcome main problems are the abs valves causing the 3 dash lights (search 3 amigos online) a really badly sited compressor can cause air suspension models to fail giving the bags a slow leak the V8 is a solid engine but can have radiator expansion tank and cap failures
the other issue is electrics windows and door looms are problematic
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What would cause 1996 Ford Explorer to overheat then idle high and low?

Only a few general concepts, keep in mind that the exhaust gas recirculation (EGR) valve is an integral part of a vehicles emissions control systems. It operates under the premise of lowering combustion chamber temperatures to reduce the amount of pollutants created by the combustion process. Being closely tied to the combustion process, this valve's operation has direct effect on the overall performance of the engine. Poor or faulty operation of the EGR valve can result in several notable symptoms and leads to increased pollutant emissions.

Poor Idle: An improperly closing EGR valve will act as a vacuum leak, disrupting the correct fuel and air mixture, causing a lean mixture condition. This results in misfiring cylinders and poor engine idle.

Overheating: The basic function of the EGR valve is to introduce exhaust gases into the combustion chamber at specific and controlled rates, lowering combustion temperatures, and lowering pollutant emissions. An EGR valve that does not open properly fails to introduce sufficient amounts of exhaust gases, causing combustion chamber temperatures to rise, leading to overheating of the engine.

Poor Fuel Economy: A sticking EGR valve will not open and close at the proper rate, leading to a reduction in the efficiency of the combustion process due to the lean fuel-air mixture it causes. This results in the engine having to work harder to perform the same amount of work, requiring more fuel to do it. On-board computer systems can also try to compensate for this lean condition by introducing additional fuel to the mixture, further increasing fuel consumption.

Increased Emissions: EGR valves are designed to lower the emission of pollutants from the combustion process. This is done by lowering the temperature of the combustion process through the introduction of exhaust gases into the fuel and air mixture. Lowered combustion temperatures result in more efficient burning of the fuel and air mixture, and less pollutants in the exhaust emissions. An improperly operating EGR valve will not correctly lower combustion temperatures, causing noxious emissions to increase, which can cause a vehicle to fail emissions inspection.

Test cylinders compression and check if some fault code is stored in the PCM 9computer).

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0helpful
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Power steering pump on 2001 land rover disco ii makes a laboring noise when I turn the wheel as well as there is a leak somewhere in the system. I had the hoses replaced a month ago, but there is still a...

The noise is because the oil level is low and the pump is reverburating. Look at the bottom of the steering box, its usually the lower oil seal that leaks. If it is the steering box , then i suggest you take it to a mechanic to replace the seal, because to remove the drag link arm is very difficult without proper pullers.
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Land Rover disco 2, rear suspension lower

SPRAY REAR AIR BAGS WITH SOAPY WATER AND LOCK FOR BUBBLES. dOES NEW PUMP KICK ON?
0helpful
1answer

Runs but dont want to idle smooth tech 4 motor sometimes it smooths out then rough again thanks

1 Inspect M.A.P. Sensor Faulty M.A.P. Sensor. 2 Inspect EGR Valve Improperly Functioning or Faulty EGR Valve. 3 Inspect Fuel Injector Dirty or Worn Fuel Injectors. 4 Inspect Idle Air Control Valve Damaged, Loose, or Faulty Idle Air Control Valve. 5 Inspect Idle Speed Actuator Damaged, Loose, or Faulty Idle Speed Actuator. 6 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor. 7 Inspect Fuel Filter Clogged or Dirty Fuel Filter. 8 Inspect PCV Valve Plugged or Damaged PCV Valve. 9 Inspect Carburetor Worn, Faulty or Damaged Carburetor. 10 Inspect Valve Burned, Worn, or Sticking Exhaust Valves. 12 Inspect TimingSet Slipped TimingChain or Worn TimingGear(s). 13 Inspect Fuel Pump Faulty Fuel Pump. 14 Inspect Camshaft Camshaft Lobes Worn. 16 Inspect Point Set Burned, Worn or Incorrectly Set Ignition Points.
1helpful
1answer

Three trouble codes

Trouble Code: P0421


Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:

Air leaks at the exhaust manifold or in the exhaust pipes
Catalytic converter is contaminated, damaged or has failed

Front HO2S and/or the rear HO2S is loose in the mounting hole

Front HO2S older (aged) than the rear HO2S (HO2S is lazy)

Front HO2S or rear HO2S is contaminated with fuel or moisture


Trouble Code: P1173

HO2S-21 (Bank 2 Sensor 1) Circuit Malfunction

Possible Causes:

Base engine mechanical fault affecting one or more cylinders

EVAP Purge valve stuck or the hoses to the valve are reversed

Fuel metering fault (fuel injector sticking open or leaking)

Fuel pressure too low or too high, fuel supply contaminated

HO2S element is contaminated or the HO2S heater has failed

PCV system has air leaks at the valve or related hoses



Trouble Code: P0174
Adaptive Fuel Trim Too Lean (Bank 2)

Possible Causes:

Vehicle driven low on fuel or until it ran out of fuel

One or more injectors restricted or pressure regulator has failed

Fuel delivery system supplying too much or too little fuel during cruise or idle periods (e.g., faulty fuel pump, or dirty fuel filter)

Air leaks after the MAF sensor, or air leaks in the PCV system

Air leaks at the EGR gasket, or at the EGR valve diaphragm

Exhaust leaks before or near where the front HO2S is mounted

HO2S is contaminated, deteriorated or it has failed

Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)

Base engine -mechanical- fault affecting one or more cylinders
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