Question about 1999 Buick Century

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How do i get to the spark plugs on the back side of the engine. It looks like I might get to them if i take the alternator off.

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On all GM 3.1 L engines(including Buick Century), (be sure the engine is COLD, so that the steel spark plugs do not strip the aluminum threads of the engine block), the procedure is the same. Remove the 4 bolts holding the dog-bone shaped upper motor mounts that connect the engine to the front frame(the engine will not fall), above the radiator, on each side(two bolts for each mount). Then use one of two methods. 1. Using a tilt tool, available from Snap-on, or other parts houses, attach the tool in place of one of the mounts, and with the transmission in NEUTRAL(This is critical!), use a socket wrench to draw the engine forward to allow access to the rear spark plugs. The access will be a little tight, but all three rear spark plugs are now accessible. 2. Some technicians will use basic physics to attempt the process without the tool. Using that method, the same mounts are removed, but the vehicle is placed on level ground. With the transmission in Park(the opposite of the method using the tool, above), the emergency brake is released, and the vehicle is pushed forward, until the engine tilts forward(may a strong physique, or an 800lb gorilla, whichever is readily available in your immediate vicinity). Good idea to reset the emergency brake, to hold the engine in position, until the plugs have been replaced. You can then push the vehicle backwards until the motor mount holes match up again(after releasing the e-brake) and re-insert the motor mounts, and bolts. With a bit of experience, all three plugs can be replaced in less than 10 minutes. Good Luck! 

Posted on Jun 29, 2009

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Where is the spark plugs located for the 2002 4 cylinder highlander located. Plan on replacement.


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I replaced my spark plug wires on my 1996 chevy truck. may have crossed one,need a diagram from the spark plugs to the distributer cap.


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Location of sparks plugs


For Jeep Cherokees with a 4.0 engine; (if you are standing in front of the vehicle looking back at the engine compartment) the spark plugs are on the left side / the same side as your battery. What look like spark plugs on the right side of the engine are actually your fuel injectors. On the exact opposite side of the engine block, all 6 spark plugs are held in place with a long rectangular box (called a coil pack) that has 3 small raised boxes on it. The coil pack is the length of the engine block and about 1 1/2 wide. There are 4 large approx 1/2 bolts that hold this coil pack in place. There is a plug on the back end / closest to the fire wall where you can upplug this coil pack but I couldn't unplug it.
Simply, remove the 4 bolts holding the coil pack in place, lift the coil pack away from the engine block and the spark plugs are exposed. The boots that attach to the spark plugs are "fixed" in to the coil pack. Replace your spark plugs some type of using anti-sieze compound, adjust your gap, and torque to 19 lbs. NOTE: use dielectric grease on plug boots and coil pack ends of wires. can also be used on plug in bulbs.
The above answer is great but if they are platnum plugs dont bother setting gap because you usually don't get a spec anyways and you do more harm than good. The gap is preset.

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1 Answer

Spark plug removal


Use my advice at your own risk. I will not be held responsible for what you do to your vehicle. For Jeep Cherokees with a 4.0 engine; (if you are standing in front of the vehicle looking back at the engine compartment) the spark plugs are on the left side / the same side as your battery. What look like spark plugs on the right side of the engine are actually your fuel injectors. On the exact opposite side of the engine block, all 6 spark plugs are held in place with a long rectangular box (called a coil pack) that has 3 small raised boxes on it. The coil pack is the length of the engine block and about 1 1/2 wide. There are 4 large approx 1/2 bolts that hold this coil pack in place. There is a plug on the back end / closest to the fire wall where you can upplug this coil pack but I couldn't unplug it. Simply, remove the 4 bolts holding the coil pack in place, lift the coil pack away from the engine block and the spark plugs are exposed. The boots that attach to the spark plugs are "fixed" in to the coil pack. Replace your spark plugs some type of using anti-sieze compound, adjust your gap, and torque to 19 lbs. NOTE: use dielectric grease on plug boots and coil pack ends of wires. can also be used on plug in bulbs. The above answer is great but if they are platnum plugs dont bother setting gap because you usually don't get a spec anyways and you do more harm than good. The gap is preset

Jul 12, 2008 | 2002 Jeep Grand Cherokee

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