Jaguar XJ6, 3.4L, - Classic Car Fuel Injection Conversion

Based on our Premium Vehicle Kit for 2 SU or Stromberg carburettor upto 220 BHP

This kit contains all the parts needed for our Classic Fuel Injection system
(you do not need to order anything else from our range )

Save around £200 when buying as complete kit
(compared to individual component prices)





This kit contains all the parts needed for our Classic Fuel Injection system
(you do not need to order anything else from our range )

This Premium kit will suit a vehicle with twin SU or Stromberg carburettors and includes our unique easy fit carburettor adaptors and full idle speed control capability

We have assembled this kit for easy ordering but if you prefer you can still order some or all of the parts using our individual listings

Ordering our kits will also save you money, our kits are typically 10 to 15% cheaper than ordering individual parts


This kit contains

Engine ECU - Most of our systems are now based on the MaxxECU MINI ECU
ECU software
ECU to Laptop communication lead

Engine Sensor Kit Comprising -
Throttle Position Sensor
Coolant Temperature Sensor
Manifold Absolute Pressure Sensor
Distributor Sensor
Distributor Pickup ( you need to specify at time of ordering how many cylinders )
Ignition Amplifier
Idle Control Valve and housing
Wide Band Oxygen Sensor Amplifier
Wide Band Bosch Oxygen Sensor
Weld On Oxygen Sensor Boss

Fuel System Kit Comprising -
High Pressure Fuel Pump
Fuel Pump Brackets
Inline Fuel Filter
Fuel Filter Bracket
Fuel Pressure Regulator
10m of High Pressure Fuel Hose
Fuel Hose Clamps

Fuel Injector Kit Comprising -
2 x Fuel Injectors for total engine power upto around 220 BHP
2 x Fuel Injector High Pressure Hose Fittings for Fuel Inlet
4 x Fuel Injector Mounting Plates
4 x M6 Mounting Plate Fixings
2 x Carburettor Adapters to suit
2 x Carburettor Adapter Idle Air Take Hose Fittings

Electrical Wiring
Twin injector universal wiring loom ready to install

Please note this kit does not contain nuts, bolts and other fixings or adapters as they will be specific to your application but will easily be sourced from your normal suppliers or your existing workshop stock of parts.

Special Note - Jaguar XK Engines ( 2.4, 3.4, 3.8, 4.2 - 6 cylinder ) with the original inlet manifold

The Jaguar XK with the original inlet manifold appears to be very sensitive to cylinder compression test pressures.
The design having a common inlet area for all cylinders means the fuel / air mixture distribution within the manifold can be particularly affected by the compression pressures within each cylinder.

Low or uneven pressures across cylinders can lead to poor idle quality or in the worst cases poor running caused by poor distribution within the inlet manifold.

When measured “ dry “ a good condition engine should have cylinder pressures of around 150 to 160 psi and no issues are normally encountered.
Engines with less than 140 / 145 psi typically can suffer from degraded idle quality.
Engines with less than 130 / 135 psi appear to commonly suffer from poor idle quality and overall driving performance.
Pressure variations across cylinders can also cause these issues even if the majority of cylinders show good readings.

Any issues are normally a combination of this original Jaguar inlet system design and the overall condition of the engine rather than a problem with the EFI conversion.
An EFI conversion will improve a good engine but it will not fix a worn engine !

Engines with a non standard inlet manifold having separate inlet runners for each cylinder, such as Weber, seem not to suffer as much from these issues or at least are better at masking the issues.