Ignition Lead Sets

Ignition HT Lead Cylinder 1.
The ignition lead (high-tension wire) 477905441 is a factory-spec wire that carries high-voltage spark from the distributor or coil to the spark plug(s) on the Porsche 924. It ensures the spark reaches the plug at the correct moment and with sufficient strength for reliable combustion.

Fits:
Porsche 924 1980 - 1985

Diagram ref no 26

What this Ignition HT Lead does:
• Delivers a clean, strong spark from the ignition system to the spark plugs, enabling efficient combustion and reliable engine starting.
• Provides high-quality insulation to prevent electrical leakage or arcing, ensuring spark integrity even under heat and vibration typical in the engine bay.
• Maintains consistent resistance and electrical characteristics, resulting in stable ignition timing, smoother running, and reduced misfire risk.
• Replaces worn, cracked, or degraded original leads to restore original ignition performance - especially important on older cars where insulation can deteriorate over time.

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477905441

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Ignition HT Lead Cylinder 2.
The 477905442 is a factory-specified high-tension ignition lead (spark plug wire) for Porsche 924 engines. It connects the vehicle’s ignition coil or distributor to the spark plugs, delivering the high-voltage spark required for fuel ignition inside the engine cylinders.

Fits:
Porsche 924 1980 - 1985

Diagram ref no 26

This ignition lead:
• Transmits strong, stable high-voltage current from the ignition source to each spark plug, ensuring proper combustion and engine performance.
• Maintains excellent insulation and voltage integrity under the extreme conditions of heat, vibration, and engine bay exposure.
• Provides correct length, terminal fitment, and resistor specification as per Porsche’s original design - ensuring the ignition system operates to factory standards.
• Helps deliver clean combustion, consistent throttle response, smooth idle, and reliable starting - key to engine health and drivability on Porsche 924.

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477905442

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OE Match ignition HT lead set, five ignition cables are supplied for renewal of ageing or damaged leads.

Fits

• Porsche 924 2.0L 1976–79
• Porsche 924 2.0L 1980–85
  
  

Check fitment for your specific vehicle (model, year, engine) before ordering.

What This Product Does

HT means high tension: these cables conduct the ignition system’s high voltage to the spark plugs, where it initiates combustion. Insulation around each conductor helps contain that voltage along its intended path.

Functions

• Conducts ignition voltage to the plugs.
• Insulates the electrical path between ignition connections.
• Connects the ignition components through dedicated leads.
  
  

Technical Details

• Supplied quantity: five cables.
• Application identifiers include XJ, XK and M31.03; refer to the individual fitment entries.
  
  

Symptoms of Fault

• Uneven running or misfiring during acceleration.
• Starting difficulties or hesitation.
• Ignition problems that worsen in wet conditions.
• Split, hardened or otherwise damaged insulation.
• Loose connections or corroded terminals.
• Evidence of electrical tracking around cables or boots.
  
  

Why Replacement Matters

Heat, vibration and contamination can deteriorate ignition cables. Damaged insulation, degraded conductors or corroded connections can interrupt the intended electrical path. Renewing leads with a confirmed fault addresses that deterioration; inspect the plugs, distributor connections and cable routing at the same time rather than assuming every misfire originates in the leads.

FAQs

How many cables are included?
The supplied set contains five cables.

Can one faulty lead affect a single cylinder?
Yes. A defective individual cable can cause a cylinder-specific ignition problem, although other ignition or fuelling faults can produce similar symptoms.

Does a resistance test confirm cable condition?
A multimeter can identify some conductor faults, but a resistance reading alone does not establish whether the insulation remains sound.

Should the spark plugs also be changed?
Inspect their condition and service history. Replace worn plugs as required rather than assuming that new plugs are necessary whenever leads are renewed.

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Related, superseded, cross reference or alternative numbers for comparison.

477905441

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Ignition HT lead set

Fits:
Porsche 924 1977-85

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477905441

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OE Match ignition HT lead set, these high-tension cables form part of the engine’s spark-delivery system.

Fits

• Porsche 924 2.0L Carrera GT M31.50 1980-86
  
  

Check fitment for your specific vehicle (model, year, engine) before ordering.

What This Product Does

HT means high tension: the voltage used by the ignition system to generate a spark. The leads carry this electrical pulse towards the plugs, where it ignites the mixture within each cylinder. Their insulation helps keep the voltage within the intended electrical path.

Functions

• Conduct ignition pulses to the spark plugs.
• Insulate the high-voltage conductors.
• Provide connections between ignition components.
  
  

Technical Details

• Product type: ignition HT lead set.
• Brand: OE Match.
• Listed engine capacity: 2.0L.
• Carrera GT engine identification: M31.50.
  
  

Symptoms of Fault

• Uneven idling or hesitation during acceleration.
• Misfiring when the engine is loaded or conditions are damp.
• Insulation that has split, stiffened or developed tracking marks.
• Corroded terminals or poorly seated connection boots.
• Resistance measurements that indicate conductor deterioration.
  
  

Why Replacement Matters

Age, engine heat and contamination can damage lead insulation or electrical connections. Once deterioration is confirmed, replacing the affected lead set addresses an identified source of ignition leakage or excessive resistance. Check the plugs, distributor connections and cable routing as part of the same repair; similar running symptoms can have other causes.

FAQs

Could one faulty cable affect only one cylinder?
Yes. An individual lead can deteriorate independently, although the remaining cables may have experienced similar ageing.

Is a resistance measurement enough to confirm condition?
No. It can reveal conductor faults, but may not expose insulation leakage. Include inspection of the insulation, terminals and boots.

Must the spark plugs also be changed?
Inspect their condition and service history first. Renew worn plugs where required rather than assuming that replacing cables alone will resolve every misfire.

Related reference numbers
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93760910501

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Ignition HT lead set, Complete set
This OE Match Ignition HT Lead Set is a complete high-tension ignition cable kit designed for Porsche 924 Turbo models. It delivers electrical current from the ignition system to the engine’s spark plugs.

Fits:
Porsche 924 Turbo 1979 - 1982

This OE match ignition HT lead set is a direct replacement for the original Porsche ignition wiring used in the 924 Turbo. Designed to factory specifications, the set includes all necessary leads to connect the ignition coil and distributor to each cylinder.

This ignition lead set transmits high-voltage electrical current from the ignition coil or distributor to the spark plugs, ensuring a strong and consistent spark for combustion.

By maintaining reliable spark delivery, it supports smooth engine operation, efficient fuel combustion, and consistent performance.

Function
• Transfers high-voltage current to spark plugs
•  Ensures consistent and reliable ignition spark
•  Maintains proper combustion efficiency
•  Reduces electrical resistance and signal loss
•  Provides insulation against heat, moisture, and vibration

Over time, ignition leads degrade due to heat, age, and electrical stress. This can cause weak spark delivery, leading to misfires, poor performance, and increased fuel consumption. Replacing worn leads restores ignition efficiency, improves engine smoothness, and ensures reliable starting and performance.

When to replace
•  Engine misfires or rough idle
•  Difficulty starting, especially in cold or damp conditions
•  Visible cracks, wear, or brittle insulation
•  Increased fuel consumption or poor performance
•  During tune-up or ignition system service

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93160910501

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Ignition HT Lead Set.
Restore reliable ignition performance with this OE Match Ignition HT Lead Set, manufactured as a direct replacement. Produced to OE-style specifications, this complete high-tension lead set is designed to deliver high-voltage current from the ignition coil or distributor to the spark plugs with minimal electrical resistance, ensuring consistent spark delivery for efficient engine operation.

Fits:

• Porsche 924S 2.5L 1986-87
• Porsche 924S 2.5L 1988
• Porsche 944 2.5L 8V 1982-87
• Porsche 944 2.7L 8V 1988-89
• Porsche 944 Turbo 2.5L 8V 1985-88
• Porsche 944 Turbo 2.5L 8V 1989-91
• Porsche 944 Turbo S 2.5L 8V 1988  

Over time, ignition leads are exposed to heat, vibration, moisture, and engine contaminants, causing the insulation to deteriorate and the internal conductors to weaken. This can result in poor ignition performance, engine misfires, reduced fuel efficiency, and difficult starting. Replacing worn HT leads helps restore dependable ignition performance, improve combustion efficiency, and maintain engine reliability. This OE Match ignition HT lead set is ideal for routine maintenance, ignition system repairs, and Porsche restoration projects.  

What This Product Does:

• Transfers high-voltage current from the ignition system to the spark plugs.
• Ensures consistent spark delivery for efficient combustion.
• Helps maintain smooth engine performance.
• Reduces the risk of ignition voltage loss.
• Replaces aged, cracked, or deteriorated ignition leads.
• Supports reliable engine starting and efficient fuel combustion.
• Provides an OE-style fit and dependable quality.

Symptoms Of Wear Or Failure:

• Engine misfires or hesitation.
• Difficult or inconsistent starting.
• Rough idle or uneven engine running.
• Reduced engine performance.
• Increased fuel consumption.
• Cracked, hardened, or damaged lead insulation.
• Visible arcing or electrical leakage from the HT leads.
• Scheduled ignition system servicing or restoration work.

Why Replacement Matters:

• The ignition HT lead set is responsible for delivering high-voltage electrical current to each spark plug at precisely the right time. Any deterioration in the insulation or internal conductor can reduce spark energy, resulting in incomplete combustion, poor engine performance, increased emissions, and reduced fuel economy.
• Replacing worn ignition leads restores efficient spark delivery, improves engine performance, supports reliable starting, and helps protect other ignition system components from unnecessary strain. Manufactured as a direct replacement and produced to OE-style specifications, this OE Match Ignition HT Lead Set provides the correct fit, dependable electrical performance, and long-lasting durability, making it an excellent choice for Porsche maintenance, repairs, and restoration projects.

Related reference numbers
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94460206010

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Ignition HT lead set.

Fits:
Porsche 944 8V 1982-89
Porsche 924S 1986-88
Porsche 944 2.5L Turbo

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94460901520

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Ignition HT lead set.
Set of 4 leads with distributor king lead.

Fits:
Porsche 944 8V 1982-89
Porsche 924S 1986-88
Porsche 944 2.5L Turbo

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94460901520

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Group plug lower section on ignition lock connector housing, forming part of ignition lock wiring harness.

Fits:
Porsche 911 1970-89
Porsche 914/6 1970-72
Porsche 924S 1986-88
Porsche 928 1983-95
Porsche 944 1985-91
Porsche 968 1992-95
Porsche 964 1989-94

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99965242640

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