How to remove a coil pack boot that is stuck on a spark plug. 1997 E420 Benz

Couple of reasons. You may need to have the Radiator backflushed to remove sediment. You also have an Electric cooling fan which may be malfunctioning. They (fans) often have more than 1 speed and high speed may be broken so it can not keep up with extreme heat.

Some fans use more than 1 relay to switch the fans and the second stage relay may be bad.

Overall, the A/C coil is placed in front of the Radiator and depends on airflow to function. This makes the air available to the Radiator much hotter so the Radiator is having a hard time cooling the engine. The Electric radiator fans kick up the airflow to help both systems out.

A dirty radiator, old antifreeze, etc. can affect performance.

I hope my solution is helpful. Radiator shops can service most Brands.

YOU HAVE TO REMOVE COIL PACK WITH PLUG BOOTS ATTACH TO COIL ASSEMBLY FROM TOP OF VALVE COVER.YOU HAVE 4 SCREWS ON CENTER TOP VALVE HOLDING COIL PLUG BOOTS ASSEMBLY IN PLACE. ONCE YOU REMOVE COIL PACK ASSEMBLY WITH PLUG BOOTS.THE SPARK PLUGS UNDER THE COIL ASSEMBLY.YOU CAN REMOVE SPARK PLUGS.FROM TOP VALVE COVER WHERE YOUR COIL PACK COME OUT.YOU NEED DEEP 6" INCH SPARK PLUG SOCKET AND EXTENSION TO LOOSEN AND REMOVE SPARK PLUGS. YOU NEED SPARK PLUG GAP GAUGE.YOU NEED TORQUE WRENCH.NOT MANDATORY LONG AS YOU DONT OVER TIGHTEN SPARK PLUGS.STRIP THREADS.IN HEADS

3 --------------------- 6
2 --------------------- 5
1 --------------------- 4
right left
bank bank
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front end

TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.

On the V6 engine The drivers side plugs are easy although the passenger side will require you to remove the intake boot and the coil packs, easily done with a 10 mm socket and ratchet. Disconect the coil pack connectors by depressing the plastic clip and pulling them off one by one on the three coil packs . leave the plug wires attached and pull the coil pack straight up and off the spark plug.Blow out the area around the plug with compressed air to prevent debris from entering engine when the plugs are removed. Use a 5/8 spark plug socket and a 8 inch extension bar on your 3/8 ratchet at remove the plugs. use anti seize on the new plugs, gap the plugs to manufacturer specs and install your new plugs 2. If its a 4 cyl engine its actually a bit more difficult. The intake boot assembly has a bracket that bolts to the valve cover and side of the engine and you must remove it to access the 4 coil packs on top of the engine. once again the coil pack wires must be disconected and the coil packs un bolted and removed from the valve cover to access the plugs. Blow all dirt from around plug with compressed air to prevent foreign objects or dirt from entering the engine when you remove the spark plug , once again use a 3/8 ratchet and an extension with your 5/8 spark plug socket and remove plugs, use a small amount of anti seize compound on the threads of the nes plugs and gap them to manufacturer specs before installation. Also while the coil packs are off,, Inspect them for ARC Tracing a white residue and line may form on the coil pack Tip/boot if you see alot of ARC tracing Id suggest replacing that coil pack. Especially if you have a misfire condition.

hello,good day,hoping your car is already scan with hht or star,then engine missfiring very general,you have to check fuel injection and ignition system,hoping your fuel system is clean,if your tester appear your cly.8 coil is defect,try to put cly.8 coil in other cly.for testing purpose,hoping your engine is v-8,119,or 113,or try to check the pressure diapram in fuel rail,ty

hello,if your engine is 119,,firing order 15486372, hoping it"s help you,ty

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Changing Spark Plugs

First off, on this model you don't have plug wires, you have coil packs with a boot and coil connected to the pack. The boot slides on the tops of the spark plug. The good thing about this is that you don't have to mark each wire to its location.

So to replace the plugs you need to disconnect the electrical connector to the coil pack and then unbolt the two bolts that mount the pack down, then remove the pack.

Next with a ratchet, an extension and a special spark plug socket, which has an insulator inside to protect the porcelain from getting cracked, remove the spark plugs.

Next step is to replace the plug, usually I slide off the boot from the coil pack and then remove the coil from inside the boot and slide the boot over the spark plug and start to thread the plug back in. Using this method allows to you feel if you are threading the plug in right. Then with a torque wrench you would torque the spark plug to the specs for the type of engine you have.

3.2/3.5L Engine (20 ft-lbs)
2.7L Engine (13 ft-lbs)

Next reinstall the coil pack with the two mounting bolts, it is only necessary to hand tigthen the two bolts. Then plug back in the electrical connector and continue this process on the next 5 spark plugs.

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Changing Dome Light

To remove the map light bulbs you need to first remove the overhead console.

To do this you need to remove the screw at the front of the overhead console (which is more towards the front windshield).

Next you need to pry down on the rear of the overhead console and then disconnect the electrical connectors.

Then, with the overhead console pulled down, pull of the map light bulbholders and replace the bulbs.

Installation is the reverse of the removal process.

First off, on this model you don't have plug wires, you have coil packs with a boot and coil connected to the pack. The boot slides on the tops of the spark plug. The good thing about this is that you don't have to mark each wire to its location.

So to replace the plugs you need to disconnect the electrical connector to the coil pack and then unbolt the two bolts that mount the pack down, then remove the pack.

Next with a ratchet, an extension and a special spark plug socket, which has an insulator inside to protect the porcelain from getting cracked, remove the spark plugs.

Next step is to replace the plug, usually I slide off the boot from the coil pack and then remove the coil from inside the boot and slide the boot over the spark plug and start to thread the plug back in. Using this method allows to you feel if you are threading the plug in right. Then with a torque wrench you would torque the spark plug to the specs for the type of engine you have.

3.2/3.5L Engine (20 ft-lbs)
2.7L Engine (13 ft-lbs)

Next reinstall the coil pack with the two mounting bolts, it is only necessary to hand tigthen the two bolts. Then plug back in the electrical connector and continue this process on the next 5 spark plugs.

if they unscrew easy then your good to go. have you ever changed plugs before? sometimes if they are hard to get to you need the right socket extension,swivels. probably the best tip i can give you is that if a plug doesnt come out leave it in, it costs lots of money to get a stuck plug out of engine. let me know if you need help