STC1186 - vacuum advance unit Rover V8 EFI 3-pin by Allmakes OEElectrical Part Land Rover Range Rover Discovery

STC1186 - Vacuum Advance Unit – V8 EFI – 3-Pin

- €133,30

€133,30

€133,30 - €133,30

€133,30

OEM: Made by an Original Equipment Manufacturer. This part is made by an original equipment manufacturer or under their license, ensuring compatibility and quality.

Brand Allmakes OE

Vacuum Advance Unit for the ignition distributor on V8 EFI petrol engines, for distributors fitted with a three-pin amplifier module.

The vacuum capsule mounts on the side of the distributor body and connects by small-bore hose to a ported vacuum source on the induction system. Under part throttle and light load the diaphragm is drawn in against its spring and rotates the distributor base plate carrying the pickup, advancing ignition timing ahead of the mechanical centrifugal advance curve. This improves combustion efficiency and part-load fuel consumption.

Note: distributors fitted with a two-pin amplifier module take a different vacuum capsule. Check the module before ordering.

A ruptured diaphragm will not hold vacuum, leaving the engine running on centrifugal advance alone: flat part-throttle response and heavy fuel consumption.

Vehicle Model Land Rover Discovery 1 1989-1998 (L318)

Fitment Notes DISCOVERY 1 1989-1998 (L318) — V8 EFI Petrol (3.5L / 3.9L). Vacuum capsule for ignition distributor, callout 3. JLR comment: 3 Pin. Fits VIN FA393361 to WA799999. The 2-pin equivalent is RTC3201.

Alternative Codes

STC1186

In stock 1 unit

1 · Gouda 0 · Drachten

Express delivery available

When will my order arrive?

Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
Netherlands / Belgium / Germany: 2–4 working days.
Other EU countries + UK: 4–8 working days.
Outside EU/UK: delivery times vary — contact us for an estimate.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the Vacuum Advance Unit (STC1186) and what does it do?

The STC1186 is the 3-pin vacuum advance capsule for the ignition distributor on the V8 EFI petrol engine. It adjusts ignition timing based on manifold vacuum for better efficiency and running.

Which vehicle and engine does it fit?

This vacuum advance unit fits the Discovery 1 (1989-1998) with the 3.5L and 3.9L V8 EFI petrol engine, from VIN FA393361 to WA799999. It is the 3-pin type.

What is the difference between the 3-pin STC1186 and the 2-pin RTC3201?

The STC1186 is the 3-pin vacuum advance unit, while RTC3201 is the 2-pin equivalent for this V8 EFI application. Count the pins on your distributor connector to confirm which one you need.

What are the signs the vacuum advance unit needs replacing?

A failed vacuum advance capsule usually causes poor throttle response, pinking, and worse fuel economy on the V8 EFI. A split diaphragm that no longer holds vacuum is the typical failure.