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ECU reconditioning, ECU repair, ECU testing. New remanufactured & used ECU’s
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 Jaguar v12 1992 -
This is a very common fault with Jaguar V12 engines, they tend to cut out like clock work. These engines have a quite complicated engine management system with one ECU (electonic control unit) in the boot another ECU in the passenger footwell and two ignition amplifier ECU’s towards the front of the engine. So these systems can be very complicated and time consuming to diagnose but one very common fault is with the Crank Shaft Sensor located at the front under side of the engine, just behind the crank pulley. The sensor breaks down when it gets hot and cuts out the engine. This fault is quite common on most Jaguar engines.
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Hessitation, power loss. This type of problem can be one of the most time consuming faults to find because the problem often is only slight and the fault only shows up when the car is being driven under load.
One of the most commen causes of this is fouled or sticking injectors that can be reconditioned at less than tenth the price of a new set. For more information on injector servicing click on injector.
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Jaguar XJ6 1980 - 86
The Jaguar XJ6 just would not start from cold. The owner had been starting it before it came to us by putting a greenhouse heater under the engine sump for a few hours in the garage but now even that didn't work. The spark plugs were first removed to do compressions and as expected we found them flooded with petrol. Compressions were normal so on to checking for enough sparks to the plugs, ignition timing, and even valve timing were checked to eliminate all except the fuelling from the suspect list. The plugs were dried off, starting was attempted again, and the plugs flooded again. Fuelling was by twin SU Carburettors and an automatic choke unit so suspecting a faulty automatic choke unit this was disconnected from the system. Still wouldn't start though and still flooded the plugs. So we stripped the carburettors and rebuilt them again after finding nothing wrong here. Only a couple of suspects left now – am blocked exhaust or a bad air leak into the inlet system. The blocked exhaust was eliminated by listening to the tailpipe while cranking - a severe blockage here makes a hissing sound. Checking for a leaky inlet is a lot easier with the engine running using a stethoscope or an ultrasonic detector.(The inlet leak creates ultrasonic sound where it occurs). To check on a non starting engine is very difficult unless the leak is a big one that shows up by whistling and hissing on cranking. The Jaguar did neither. Fortunately though we did have an ultrasonic generator that screwed into a spark plug hole - this then filled the inlet system with Ultrasonic sound and using a detector on the outside we found the inlet manifold gasket to have a series of small leaks all along it's length. A few leaks of this magnitude would not normally prevent a car from starting but with a Jaguar the manifold is getting on three feet long and the consequent reduction in airflow through the carburettors prevented starting. A new manifold gasket and a tune later it started first time every time again.
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Jaguar, all models 1993 - 2004 onwards
Emission Failures -
High CO & low lamna reading. common causes of rich running faults are the lamna sensor or the ECU (engine control unit) both of these parts are relatively simple to check, to check the sensor strip back the insulation on the signal wire from the lamna sensor, this wire is usually black. Then hold the bare wire between your finger and thumb then touch your other hand on to the battery positive the internal resistance of your body will give 1volt at your finger tips which is what the sensor would give out when the engine runs rich, if the emissions come down then you have a faulty lamna sensor or wiring but if the emissions remain the same then the ECU is a possible fault. For more information on ECU testing click on ECU
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