Re: Spark plug gap for 2004 jeep grand charokee for Bosch...
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
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If you buy new plugs that are correct for your car, they normally come pre gapped (particularly platinum and other 'non copper' plugs). I like to run 36/1000 or 0.8mm. But 1.1mm (43/1000) is also common.
I use Bosch platinum plugs in my Jeep Grand Wagoneer. I recommend nothing less than double platinum. Bosch makes a platinum plug with 4 electrodes - these are great because you don't have to set the gap on them. I have an 8 cylinder and these plugs aren't exactly cheap, but, with these rising gas prices, they DO make a difference in performance and mileage. Hope this helps!!
You will need to know that it is a 2004 Jeep Cherokee (or either Grand Cherokee, but they should have same engine) and the engine code. That is the 8th character in your VIN number. Parts store can then get you the right plugs and let you know the correct gap to set them at. IF you do not want to mess with setting the gap you can get BOSCH DOUBLE PLATINUM plugs, they will not need to be set.
Check your spark plug, wires, distributor cap and finger. If you spark plugs older than 15000ml, replace them. To check your spark plug wires, use a tester (U can buy at any auto store) you hold direct on the wire and a small sparkling will show you if the wire works or not. You can check the wires also with this: use a single spark plug (don't remove one out your engine!), remove the wire from first SP, connect it with the single SP, hold it to ground, let someone start your engine...you need to see regular sparks.. do this step by step with all 6 wires. If all wires are fine, check the SP's, If you miss on one wire, replace the wire, if you miss on more than one, chekc the distributor cap and finger. If this items are older than 20000ml or 5 years, replace them.
These engines use platinum plugs-you don't gap these type of plugs because you will damage te platinum electrode and cause misfire problems. Make sure you use bosch platinum factory recommended plugs and if he vehicle has more than 75k i would recommend replacing your plug wires as well/
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