Spark plug replacement Guide2009 BMW X3
Complete DIY repair guide with step-by-step instructions. Find exact parts on Amazon for your vehicle.
Difficulty
Intermediate
Time
45-90 minutes
Parts Needed
1 items
DIY Savings
$100-400+
2009 BMW X3 — What You Need to Know
- →N52 is a 6-cylinder engine — you need 6 plugs. Don't confuse with 4-cylinder N46 models
- →BMW recommends NGK ILZKBR7B8DG (part# 90941) iridium — do not substitute with standard copper plugs
- →Iridium plugs are pre-gapped from the factory. Do NOT use a gap tool on them
- →Apply a small amount of anti-seize to plug threads if reinstalling into aluminum head (not needed for new plugs which are pre-coated)
Torque Specs
Spark plugs: 20-22 ft-lbs | Coil bolts: 7 ft-lbs
Safety Warnings
- •Do NOT re-gap iridium spark plugs — adjusting the gap damages the iridium tip
- •COP (coil-on-plug) ignition — each plug has its own coil held by one 10mm bolt
- •Work on a COLD engine only — aluminum heads make it very easy to strip hot threads
Tools Required
5/8" spark plug socket
Torque wrench
Extension (6" and 12")
10mm socket for coil bolts
Parts Needed
Spark Plugs (set of 6)DO NOT gap iridium plugs — pre-set at 0.028 inch
Shop on AmazonOEM 12120037244NGK 90941 (ILZKBR7B8DG) iridium
Basic Procedure Overview
- 1Remove engine cover (plastic clips or 10mm bolts depending on year)
- 2Disconnect each ignition coil: unplug electrical connector, remove 10mm bolt, pull coil straight up
- 3Remove spark plug with 5/8" socket and extension — break loose with a firm, straight pull
- 4Thread new NGK iridium plug in by hand (never use power tools to start threading)
- 5Torque to 20-22 ft-lbs — do not exceed as aluminum threads strip easily
- 6Reinstall coil (note: apply dielectric grease to inside of coil boot before installing)
- 7Reconnect coil connector until it clicks, replace coil bolt to 7 ft-lbs
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