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ORDER OF EXECUTION |
- A faulty injector sometimes reveals itself already at idle speed by applying a "bare hand" to it: it does not vibrate - unlike others. To avoid "frying" your fingers, perform the test on a cold engine.
- To check the voltage, pull out the valve plugs one by one with the engine running and connect to an LED tester (not a test lamp).
- If the LEDs are flashing rhythmically, the connection is OK. Before you put all the blame on the injector, do not trust this to the control unit - you should still contact the workshop for the necessary check.
- If you want to measure the resistance instead of checking the voltage, pull out the plug and connect both injector contacts to a universal device. At 20 C, the resistance value should be 14.5 1 Ohm.
- If significant discrepancies are detected, replace the corresponding injector.
- To do this, remove the fuel distributor pipeline (screws are indicated by arrows) together with the injectors.
Fuel distributor pipe for Duratec-VE engine. |
- Remove the plugs from the injectors - the fuel lines remain connected.
- To activate the fuel pump and allow the fuel system to generate pressure, cycle the ignition on and off repeatedly.
Presence of a drop - check each nozzle - Check each nozzle one by one: only one drop should come out – if more flows down, replace the nozzle.
- To check the injection jet, it is necessary to dismantle the fuel distributor pipeline. The fuel lines to all injectors remain connected. Pull out – up to the injector being checked – the plugs from the other injectors and drain the fuel into a container.
- If you turn on the ignition, the injector should inject fuel in a conical stream.
- Check all injectors in this way.
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Only in Duratec engines is there a direct "wire" to the throttle valve – the gas pedal rod
In petrol engines, a mechanical Bowden cable connects the gas pedal to the throttle valve. Bowden cables, meanwhile, were not random parts here before. However, when they are improperly laid in the engine compartment, they can easily get on someone's nerves. For example, when its "soul" is clamped in a protective casing and as a result, trouble can happen to the throttle valve: in extreme cases, the engine begins to "howl" with each switching process, since the "slowed" thrust places much higher demands on the return mechanism of the throttle valve. To avoid these symptoms, sometimes follow the tortuous paths of the gas thrust and treat all its turning mechanisms with a few drops of lubricating oil - and especially after washing the engine.
State of the art for DuraTorg engines – "drive-by-wire"
If your Mondeo is equipped with a diesel engine, you can safely forget our advice: in diesel units, communication between the accelerator pedal and the fuel pump is realized by an electric wire. Experts talk about the so-called "drive-by-wire" type of regulation. The lifting path of the pedal affects the throttle sensor, the electrical impulses from which then go along the electric wire to the fuel pump control unit.
