This is my spark plug change on a 2004 xA. It had NGK V-power plugs and I replaced them with the same. $7 for 4 spark plugs at local auto-part stores.
-10mm socket w/wrench,
- 5/8 inch (16mm) spark plug wrench
- Torque wrench w/ 6 inch extension and 16mm socket
- Plug/shim gap measureing tool
-4X NGK -bkr5eya
- 1 pack high temp anti-seize
1. I started with a cool engine. Used the 10mm socket to remove the engine covers 4 nuts
2. Under the engine cover I used a brush and towel to clean away dirt and debrit so it wouldn't be falling down the spark plug wells. Then I used the 10mm socket to remove the 4 bolts holding the coil packs/boots down.
3. Once all the bolts were out I did one replacement at a time. I removed the first boot from the plug by giving it a twist and pulling it off the plug. (if there isn't enough slack in the wire to pull it out, you can disconnect the clip)
4. With that out you can see down to the plug
You can insert the spark plug wrench and unscrew the plug counter clockwise
if it's stuck you can use a wrench (torque wrench in pic) and the 16mm socket on an extension to break it loose.
5. Once it's unscrewed the plug will stay in the plug wrench (if equipped with rubber grommet) and you can lift it right out. If you aren't using a plug wrench you can use a small section of hose to push down on the end of the plug or some other imagenative device.
7. Check the gap on the new plugs. (old plug shown)
It should be 0.032 in. If it is bigger you can tap the plug on the electrode to close in the gap
if the gap is too small you can CAREFULLY pry it open some.
8. Coat the threads of the plug with antiseize. This will help on your next change and keep the plugs from getting seized up in the engine.
9. Now you can put the new plug in. Lower it doen into the hole. Start by turning the wrench counter-clockwise till you feel the threads "pop" a little (that's the starting point of the threads fitting correctly) then turn the wrench clockwise to screw the plug in. If you feel much resistance, unscrew the plug and start over. This is to keep you from "cross-threading" the plug (very bad) and forcing it in where it will almost definately get seized in the engine ( very pricey to fix).
I just bought my xB a day or so after Christmas, so I haven't tried any mods. And I'm not familiar with how the new computer controlled engins react to what I'm about to mention.
In the OLD days--I mean OLD days-- we'd drop a step or two to a colder plug, then we'd gap a little wider than spec. Generally, we could feel a boost in power. Has anybody tried this on an xB? I think I will, before the stock plugs go kaput, so I can reinstall them if there's no improvement.