Your plug wires are connected to your spark plugs, so if you follow your spark plug wires to the engine and pull them out , you will find your spark plugs **I can't stress enough how important it is that you mark or remember where each plug wire goes before disconnecting. Each wire goes to one specific cylinder and they fire (spark) in a specific order. Mix this order up and your car may not run afterwards.** It is possible that your engine has a cover on the top that may say the engine size. If you remove that, you will see where the plug wires meet the engine.
Hope this helps
ARE YOU JOKEING???????LOOK IN THE ENGINE ,,YOU WILL SEE MABY 6 OR 4 ,,,WIRES,,,,,, DEPENDS ON TYPE OF CAR YOU HAVE,,,AT ONE SIDE OF EACH WIRE THERE WILL BE A SPARK PLUG,,MAKE SURE YOU ONLY DO ONE WIRE AT A TIME ,,CANT BE MIXED UP ,,THEY HAVE TO BE PUT BACK THE SAME WAY,,,VERY EASY TO DO THIS TRY IT,,,
The spark plugs in the v6 can become an involved job as the upper intake manifold. The LS uses a Coil on Plug (COP) ignition system, meaning that the spark plugs are located under the ignition coil
Locate the spark plug wires in the Cherokee cylinder head. In the 4.0 liter engine, the spark plugs are below the coil rail assembly. On the 4.7 liter engine, the spark plugs are located under each corresponding engine coil.
Read more: How to Replace Spark Plugs in a Jeep Grand Cherokee ' eHow.com http://www.ehow.com/how_4484626_replace-spark-plugs-jeep-grand.html#ixzz27zi6736d
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