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Cool the engine before attempting to remove any spark plugs.
Remove the spark plug wires
located across the top of the Eclipse model's engine. The spark plug
wires connected to the spark plugs are the flat circular ends. Grab the
wire around the circle and twist to unlock the wire. Lift up on the wire
to remove it from the engine. Some models with ignition coils above the
spark plug may require you to unhook the wire from the ignition coil to
remove the wire.
Drop the socket with the
extension and socket wrench attached into the cylinder well and on top
of the spark plug. Turn the socket wrench to unscrew and pull the spark
plug out of the engine.
Spray silicone spray into the cylinder well and onto the new spark plug threads.
Insert the new spark plug into
the socket with the threads sticking out. Slide the socket into the
cylinder well and gently turn the wrench to the right to thread the
spark plug into the cylinder head.
Use the tension tool to test the
tension or torque of the new spark plug. Set the tension to the
specifications listed on the spark plug package.
Reattach the spark plug wire to the new spark plug.
Continue this process with the other spark plugs. Be sure to only complete one spark plug replacement at a time.
Yes it has spark plugs. But it is a very involved job on the Montero.
You must remove the aluminum Intake manifold ( upper & middle portion only ) to access the spark plugs. It's best left to a Professional Mechanic to do the job. The cost can vary. Look at atleast $400.00.. Just as a side note. The biggest hassle will be putting all those hoses & wire plugs you disconnected back in the right spot. I would suggest taking pictures every step of the way
If you'll need to remove the intake (or plenum) from the engine there are @ 8-10 No. 12 nuts and or bolts which hold this in place. There are also 1-2 bracket (check by the firewall) you'll need to unbolt too. Be certain to replace the gasket that is found between the plenum and the intake and do not over tighten these nut/bolts only 20ft pounds or so. If you do remove this you'll have to remove the air inlet, throttle cables and remove hoses from the throttle body, some of which carry coolant to properlly preheat the air before enteringthe engine. I have worked on several early 89-93 Monteros without having to remove this for plugs; perhaps different under the hood of the sport.
I hope this may have helped,
If you are sure that you have removed everything that is holding the cover to the head, you may need to use a bit of force to get it off as it may be glued in place. If your plugs go in through the cover, they must be removed .
That is all the basic stuff unless you feel you need to change injectors or knock sensor which probably isn't necessary. The intake has about 8 bolts that you can remove after all vacuum lines are disconected. If you would like further detail and illustrations, I suggest go to autozone.com and register for free, then you can view a full free online repair manual