On the 2.4L engine, the 4 spark plugs are through the valve cover on top of the engine. You will need a deep 5/8" spark plug socket and a 6" to 8" extension. The socket should have a rubber liner inside to hold the plug when you extract the old one and insert the new one. The rubber also helps align and isolate the ceramic part of the plug from the metal socket wall which minimizes the risk of breaking a plug. On this engine and with original wires it's hard (nearly impossible) to mix them up but it's good practice to replace one plug at a time. So for example, working from left to right, pull the boot of the wire from the first plug (don't pull by the wire itself), insert the socket with the extension attached into the hole and make sure it is firmly seated over the head of the spark plug at the bottom and turn counter clockwise using a ratchet wrench. As resistance lessens keep turning but also pull up slightly on the extension until the plug is completely free then remove it from the socket. Adjust the gap the new plug to .05", push it into the socket and reinsert by reversing the process. You may encounter moderate resistance caused by dried oil or dirt so make sure to get past this point so that the plug is fully inserted but do not over-tighten or you risk breaking the spark plug.. Firmly reconnect the plug boot (wire) and move on to the next.
If you find that one plug is noticeably more soiled than the others then likely you will need to change your ignition (spark plug) wires also. Even if only 1 is defective the whole set should be replaced.
btw) It is important to remove anything small and loose from the engine area while you work to lessen the possibility of dropping something in the spark plug hole when the plug is removed.
If it is a V6, you will have to remove the upper intake manifold to access the rear 3 plugs.
A couple of different things could cause hesitation in a 1999 Plymouth Breeze including bad spark plugs. There could also be an issue with the fuel filter.
when do you change spark plugs
Lift the hood, disconnect the battery, remove the spark plug cables and covers, and remove the old spark plugs. Next put in the new spark plugs, replace the cables and covers, reconnect the battery and close the hood.
Screwed in the head.
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The standard spark plug gap for a 99 Plymouth Breeze is between 0.035 and 0.040 inches. The specific gap varies based on the type of size of plug used.
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