first of all you have to consider several things. 1. what is the mileage? if you have high miles you will want to change the valve cover gaskets. The reason is you will need to remove the plenum to get to the plugs and you will want to do this right the first time. 2. change your plugs while you are in there. This is very easy to do. It looks intimidating but invest the time and you be surprised how easy it is. I just did the timing belt, guide, tensioner, hydraulic tensioner, water pump, valve cover gaskets, plugs and plug wires and fuel filter and my montero runs like new with 140,000 miles.
There are two MAP Sensors on the Mitsubishi Montero Limited. They are both located on the left side of the engine about six inches apart. Look for a plug with a wire attached that resembles a spark plug wire boot.
It is a lengthy process that can be found at http://www.monterosportonline.com/diy-perf2.HTML. you have remove the intake manifold in order to replace the spark plugs or the spark plug wires. It's not a recommended task for unexperianced person.
Disconnect the battery cables, remove the spark plug cables and covers, and remove the old spark plugs. Next, put in the new spark plugs, attach the covers and spark plug cables and reconnect the battery cables.
Try these websites http://www.monterosportonline.com/diy-perf2.html http://www.justanswer.com/questions/13zdz-change-spark-plugs-2001-montero
THE INTAKE MANIFOLD MUST BE REMOVED. I WAS QUOTED > $600 TO CHANGE PLUGS. I SOLD MINE, AS IT WAS TIME FOR A TIMING BELT AS WELL. ANOTHER $600.
Replacing spark plugs is pretty simple. Disconnect the battery, remove the cover and cables, remove the old spark plugs, put in the new spark plugs, put the cover and wires back on the spark plugs, and reconnect the battery.
the firing order is 123456 1,3,5 on left side of engine from the front of the vehicle 2,4,6 on the right side of the vehicle googel (what is the firing order for a Mitsubishi montero)
THe spark plugs are buried! IT is one of the frustrating designs of this car! It takes a couple of hours for a trained mechanic to do the work and even longer for the untrained. If you have the work done, get the best, most expensive spark plugs to replace them with. I wnt 60K on my first set and am 30K into my second set.
.44 Check your owner's manual, (0.028 − 0.031 inch) for a 2003 3.8L.
I took mine to Tune-Up Masters and I was charged 159.99 because of the extra labor they had to do. On Montero Sports they have to remove the air intake to reach the other spark plugs.
The cost to change spark plugs on a 2003 Mitsubishi Montero Sport typically ranges from $100 to $300, depending on labor rates and whether you choose to use OEM or aftermarket spark plugs. Labor can account for a significant portion of the cost, especially if the spark plugs are difficult to access. Additionally, if other maintenance or repairs are needed during the process, that could increase the total expense. Always check with a trusted mechanic for an accurate estimate.
The plugs are located under the intake plenum. This is a real job because it takes removing several bolts, wires and gaskets to get to them.