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The #3 cylinder is in the rear bank of cylinders below the windshield. They are numbered from front of engine (by belts) 1 2 3. The front three cylinders nearest the radiator are numbered front front of engine (by belts) 4 5 6.
I just changed plugs on my 05' you have to remove the intake plentum to gain acsess to the rear plugs. First remove plastic cover from top of engine, remove intake hose to throtle body, unplug electrical connections to sensors on plentum, unhook vaccum lines, there are two coolant lines that need to unhooked from underneth throttle body, remove plentum support bolts, one on back and one on right side towards rear, a flash light and a mirror is useful for locating these bolts, there is also two vaccumn lines on the very back off plentum that have to be removed. remove clip on back off plentum that secures the hose that goes across the side of the plentum. Remove the six hold down bolts on plentum, and remove plentum. Spark plugs are acsessed by removing the coil packs for each cylinder, simply remove each coil pack hold down bolt and remove coil, plugs are underneth coil packs, you will need a long extension and a 5/8 spark plug socket to remove plugs.
Is it a V6? For a V6 if you are standing in front of the car it will be the middle cylinder on the firewall side of the engine. You will have to
remove the plastic engine cover and the intake manifold to get to it.
If it were on the front side of the engine you would only have to
remove the plastic cover. Since there is a good bit of work involved
removing the manifold, I would suggest that you go ahead and replace
all of the sparkplugs and consider replacing the coil for the one
cylinder also. I have a 2001 Mazda Tribute. Mine started running rough so I decided to replace all the
sparkplugs. After replacing the sparkplugs it continued to run rough. I
took it to a shop and got it scanned (no cost for the scan). The scan
showed the coil on the 3rd cylinder was bad. So I wound up having to
pull the manifold off again to replace the coil :( The first time it took me 1-1/2 hours to do the plugs, second time 1 hour to do the coil. Car runs great after coil replacement. Hope this helps.
cylinders 2/3 are on the back side of the engine. You will have to remove the intake plenum to gain access to the plugs/coils. If you are going to go thru all of that you may want to replace all the rear coils/plugs because if the vehicle has over 60k they are going to go bad.
Well seeing as u don't specify the year or engine u have in ur monte carlo, it's kinda har to tell u where they are.If it's a V6, the 3 rear sparkplugs are behind the engine under the manifold. Most times the rear engine mount must be removed and the engine preid to reach the sparkplugs from underneath.
Depending on weather its a V6 or 4cyl the are in the center of the engine cover(s) in a row, if its a 4cyl pull the 4 plug leads out and a long spark plug wrench will go down the hole to unscrew the sparkplugs, if its a V6 then unscrew the 6 screw and the pull out the 6 coils from the center of the engine covers to reveal the spark plugs