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- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
OE Match spark plug set (pack of 8) designed as a direct replacement for Porsche factory spark plugs in fit, heat range, and ignition performance. Supplied as a complete set of eight, it is intended for Porsche engines requiring this spark plug specification where a full eight-plug replacement is needed.
PACK OF 8
Fits:
Porsche 928S / 928S2 / 928S4 / 928GT 1983 - 1991
Porsche 928 GTS 1992 - 1995 (M28.49/50)
This OE Match spark plug set contains eight identical spark plugs, each manufactured to OE-equivalent standards for materials, electrode design, and thermal performance. Engineered to withstand high combustion temperatures and sustained electrical load, these plugs deliver consistent ignition and balanced combustion across all cylinders.
Replacing spark plugs as a complete set ensures even ignition timing and smooth engine operation. Over time, worn or mismatched plugs can lead to misfires, hesitation, reduced throttle response, and increased fuel consumption. This OE Match pack of eight offers a cost-effective alternative to genuine OE parts while preserving correct performance, reliability, and direct-fit compatibility.
All spark plugs install without modification, making this set ideal for scheduled servicing, tune-ups, or ignition system maintenance.
The spark plugs generate precisely timed electrical sparks to ignite the air-fuel mixture in each combustion chamber. As a full set, they ensure uniform combustion, supporting smooth engine operation, efficient fuel burn, and consistent power delivery.
Function:
• Generates a consistent ignition spark for combustion
• Supports smooth idle and responsive acceleration
• Helps maintain proper fuel efficiency and emissions control
• Direct-fit replacement for easy installation
A worn or incorrect spark plug can cause rough running, misfires, loss of power, and reduced fuel economy. Using a correct OE Match spark plug ensures ignition performance remains consistent with factory expectations, helping preserve engine reliability and long-term efficiency.
When to replace:
• Engine misfires or uneven idle
• Hesitation or reduced throttle response
• Increased fuel consumption
• At manufacturer-recommended service intervals
• During tune-ups or ignition system maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917015690
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
The 99760210405 is the individual coil module used on the Porsche M96 and M97 M-series engines in many 986/996/987/early 997 cars. Normally should be replaced as a set of six coils (one per cylinder)
Why these coils should be replaced
Age / thermal breakdown: coils are exposed to heat cycles and can develop internal insulation breakdown or hairline cracks in the housing. Over time this causes weak or leaking high voltage and intermittent sparks.
Misfire symptoms: a failing coil will cause single-cylinder misfires (P030x codes), rough idle, reduced power, increased fuel consumption and catalytic converter heating/damage if left. These are the most common reasons owners replace coils.
Carbon tracking / cracking: visible cracks or carbon tracking on the coil boot can provide a leakage path for spark, reducing performance and causing intermittent faults.
Connector / wiring issues: corroded or loose coil connectors can mimic coil failures; inspect connectors when replacing coils.
Fits:
Porsche 996 3.6L Inc C2 / C4 / C4S
Porsche 986 Boxster 2.7L / 3.2L 2003>>
Porsche 996 GT3 MKI
Porsche 996 GT3 MKII
Porsche 996 Turbo
Porsche 987 Boxster 2.7L / 3.2L
Porsche 987C Cayman 2.7L / 3.4L
Porsche 997 3.6L, 3.8L / 997 GT3
Does not come with securing bolts.
2 required per coil, please order separately (part number 90006708901).
Common issues reported in practice
- One or more cylinders misfire when the engine is hot but behave quite normally when cold (typical of internal coil failure or heat-sensitive cracks).
- Cracked coil housings on Boxster/996 cars, owners often replace the entire set for reliability.
- After a spark plug change, misfires appear because weakened coils can fail once higher-voltage plugs are installed; this is a frequently reported pattern.
How to diagnose (practical steps)
- Read codes: P0300 / P0301–P0306 point to misfires; note which cylinder is affected.
- Swap test: swap the suspected coil with another cylinder’s coil — if the misfire follows the coil, the coil is bad. (Common, quick field test used by owners.)
- Measure resistance: check primary and secondary coil resistances at ~20°C and compare to the ranges above.
- Visual inspection: look for cracks, carbon tracking, oil ingress, or damaged boots/connectors.
- Oscilloscope / HV probe: for deeper diagnosis a scope or HV probe can show spark energy, but most DIY diagnostics use swap + resistance checks.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760210405
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 955 Cayenne S 4.5L V8 2003-06
Price is for each.
Fits:
Porsche Boxster 986 2.7L 1999-02
(6 Required per engine.)
Porsche Boxster S 986 3.2L 1999-02
(6 Required per engine.)
Porsche Boxster 986 2.7L 2003-04
(6 Required per engine.)
Porsche Boxster S 986 3.2L 2003-04
(6 Required per engine.)
Porsche 996 C2 3.4L 1997-08/01
(6 Required per engine.)
Porsche 996 C4 3.4L 1997-08/01 (6 Required per engine.)
Porsche 955 Cayenne V8 S M48.00 2003-06 (8 Required per engine.)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917020791
The product you are viewing cross references to these numbers