1989 Jeep Cherokee spark plug gap 4.0

It depends on the spark plugs that have been used. Some are pre gapped, some have three preset side electrodes around the edge. Gapping spark plugs is not as critical as the old days due to modern CDI ignition systems which give a much larger spark and huge improvements in spark plug technology.

https://www.google.com/search?q=1993+Ford+Ranger+4.0+spark+plugs

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oem spark plugs, .052--.056, I found this in your owners manual.

Different spark plug manufacturers may have different gap spec.

Spark plug gap should be on the emission control sticker under the hood

Replacing Spark Plugs Jeep 4 0L

Easy job. Remove bolts holding coil pack. Disconnect Plug from Coil Pack. Remove sparkplugs. Check Gap on new plugs. Install them and put the coil pack back on. Just did it myself last weekend.

Your spark plug gap is .0350 inch.Plug type is Champion RC12LYC or matching type in other brand.Hope this helps

The gap for the sparkplugs is .035.

regular maintenance, should have been done long ago, plugs do wear and the gap changes, besides its cheap insurance

GAP=0.035"

The spark plug gap should be posted on the emissions sticker under the hood. The gap setting posted on the sticker is good for all brands and types of plugs for your vehicule

Hello, I hope this info helps...(subytech1)...REMOVAL
In this engine, each individual spark plug is located under each ignition coil.

1. Prior to removing spark plug, spray compressed air around base ofignition coil at cylinder head. This will help prevent foreign materialfrom entering combustion chamber.
2. On this engine each individual ignition coil must be removedto gain access to each spark plug. Refer to Ignition CoilRemoval/Installation.
3. Check condition of coil O-ring and replace as necessary.

1. Inspect spark plug condition. Refer to Spark Plug Conditions.

CLEANING
Theplugs may be cleaned using commercially available spark plug cleaningequipment. After cleaning, file center electrode flat with a smallpoint file or jewelers file before adjusting gap.

CAUTION: Never use a motorized wire wheel brush to clean sparkplugs. Metallic deposits will remain on spark plug insulator and willcause plug misfire.

ADJUSTMENT

Setting Spark Plug Gap - Typical
Check spark plug gap with a gap gauge tool. If the gap is not correct,adjust it by bending ground electrode. Never attempt to adjust gap bybending center electrode.

INSTALLATION

CAUTION: This engine is equipped with copper core groundelectrode spark plugs. They must be replaced with the same type/numberspark plug as the original. If another spark plug is substituted,pre-ignition will result.

Special care should be taken when installing spark plugs into cylinderhead spark plug wells. Be sure plugs do not drop into plug wells asground straps may be bent resulting in a change in plug gap, orelectrodes can be damaged.

Always tighten spark plugs to specified torque. Over tightening cancause distortion resulting in a change in spark plug gap or a crackedporcelain insulator.

1. Start spark plug into cylinder head by hand to avoid cross threading.
2. Tighten spark plugs to 27 Nm (20 ft. lbs.) torque.
3. Before installing coil(s), check condition of coil O-ring andreplace as necessary. To aid in coil installation, apply silicone tocoil O-ring.
4. Install ignition coil(s). Refer to Ignition Coil Removal/Installation.