No, the plugs and wires are very easy to replace, the back wires may seem difficult, but just reach your hand very slightly behind the UIM and you can feel the top of the plug boot, maybe a 20 minute job for all 6
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I own a landrover disco 2 and even without problems it only gets about 8mpg.Try giving it a complete tune up.If it's a 4.0 like mine the upper left intake has to be removed to change the plug wires.DIY will run you about 150$ just to change the plug wires with a new Upper Intake gasket!
NO YOU DON'T! THE TUNE UP IS JUST AS EASY AS THE OLDER CARS, BUT YOU DON'T NEED TO SET THE POINTS, OR REPLACE THE CONDENSOR! JUST THE PLUGS, WIRES, DIST. CAP, AND ROTOR CAP! NEW AIR FILTER, PCV VALVE IF IT NEEDS IT! SOME OF THE FUEL FILTERS ARE LOCATED ON THE FRAME RAIL, ON THE DRIVER'S SIDE (LOOK THERE FIRST! IT WILL BE TOWARD THE DRIVESHAFT SIDE OF THE FRAME!
You'll need to remove the upper radiator hose from the thermostat housing. Unbolt the 2 bolts holding the thermostat to the intake manifold and remove the thermostat housing and thermostat. Clean both mating surfaces and install the new thermostat with a new gasket, reinstall the radiator hose, fill with anti-freeze and check for leaks.
This problem appears to be a vacuum leak. Look around the engine for cracked and dry-rotten hoses first and replace as necessary. To check for an intake manifold gasket leak, run propane up and down the rails with the engine running (if you can keep it running...) If you hear the engine flair up in RPM, you've found your leak.
those codes are for a misfire if you've already replaced the plugs and wires and it still throws the same codes check the coil for those 2 cylinders and make sure it's firing if it is check to make sure the fuel injectors are firing on those 2 cylinders a leaking intake wouldn't cause the misfire codes it would throw like a po171 and or a po174 normally
SECTION 303-08: Engine Emission Control
1999 Cougar Workshop Manual
REMOVAL AND INSTALLATION
Exhaust Gas Recirculation (EGR) Valve
Remove the air cleaner outlet tube.
Disconnect the intake air bypass hose.
Disconnect the positive crankcase ventilation hoses.
Remove the air cleaner outlet tube.
Disconnect the tube from the exhaust gas recirculation valve.
Remove the exhaust gas recirculation valve.
Disconnect the vacuum hose.
CAUTION: When cleaning the gasket faces, do not allow debris to enter the intake manifold or exhaust gas recirculation valve. Clean the gasket faces of the intake manifold and exhaust gas recirculation valve.
Install a new exhaust gas recirculation valve gasket.
Position the EGR valve and install the bolts.
Install the vacuum hose.
Connect the EGR tube.
Install the idle air control valve. For additional information, refer to Section 303-14A . For additional information, refer to Section 303-14B .