Ignition system

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Description - Ignition System

Edit required.

Issues - Spark Plugs

  • Old spark plugs can show worn electrodes and a wider than specification gap.
  • Broken insulators are common during removal of OEM plugs.
  • Fouled spark plugs.
  • Corroded spark plug threads make it difficult to remove an old plug. Solution is to use high temperature anti-seize grease available from autoparts stores when re-installing new plugs.

Parts - Spark Plugs

  • 2003 Update W220 S500 Chassis Number: 220.175 and Engine Number: 113.960.
  • M-B part number is 003-159-66-03-26 which is the same plug as the Bosch F 8 DPP 332 which is no longer available.
  • Bosch equivalent spark plug is FR8DPP33+.
  • Denso equivalent spark plug PK16PRL11. (Denso OE quality resisted platinum spark plug with pre-set gap of 1.1mm.)

Service - Spark Plugs

  • M-B specifies replacement of plugs at every 100,000Km or 4 Years. Spark plug HT wires don't last much longer than that either.
  • Set the spark plug electrode gap to 0.039” or 1mm.
  • Tightening torque 15 - 22 ftlbs or 20 - 30Nm.

Parts - HT Wires

Edit required.

A new plug wire resistance is approximately 2.18K ohms.

Issues - HT Wires

  • Spark HT wires have a limited life.
  • The resistance element in the HT wires often fails or goes high resistance due to fatigue.
  • HT lead insulation can break down causing arcing to ground.
  • A special spark plug wire removal tool is available. It is a 17mm, open ended tool with a 25mm off-set and is made by JTC with part number J-1308. It can be found in eBay for $20.

JTC Spark Plug Wire Removal Tool J-1308

  • The rubber boot on the HT Wire is difficult to remove from a spark plug even when using the special removal tool. Solution is to apply a small quantity of dielectric grease when re-installing new plugs. This helps keep moisture away and stops corrosion. Makes it infinitely easier to remove HT Wire boot.
  • A regular 5/8" spark plug socket with a rubber insert works well for removing spark plugs. However the secret is to use a variety of extensions eg a short 1" 3/8" drive extension on the tight spots in conjunction with a with swivel head.

Permatex 22058 Dielectric Tune-Up Grease

Description - Ignition Plug Pack

Edit required.

Issues - Ignition Plug Pack

  • Burnt coil.
  • Cracked Pack.

DIY Procedures - Ignition System

Repair - Ignition Plug Pack

Article by Benz World Member haoz129 Howard on fixing a burnt coil pack, right bank, on cylinder 4 which threw the following codes:

  • P2050 Misfiring , Damages TWC (P0300) STORED
  • P2056 Misfiring of cylinder 4, damages TWC (P0304) STORED
  • P205B Misfiring of cylinder 8, damages TWC (P0308) STORED

http://mbworld.org/forums/s-class-w220/431985-ongoing-maintenance-repair-2003-s600-2.html

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