Is the starter cranking the engine?
If he doesn't, or does it slowly, please read the section below «Source of faults - electrical equipment». On the contrary, if the engine starts quickly, then in order to narrow down the troubleshooting circle, you should answer the following questions in turn.
Are the spark plugs sparking?
Remove spark plug connector, unscrew spark plug, insert into spark plug connector. Connect the spark plug with the auxiliary wire to the engine block so as to ensure conductivity (in the figure, the auxiliary wire has been omitted for the sake of clarity). Do not touch the ignition cable and spark plug - risk of accident! If yes, please clarify the next question. If not, read on to the section «Source of faults - ignition».
Is fuel entering the injection system?
Disconnect the fuel hose at its screw connection in the engine compartment (top photo is 1.8L four-cylinder engine, bottom photo is six-cylinder engine). Be careful: fuel may splatter. Therefore, when unscrewing the hose, place a thick cloth under the screw connection. Extend the fuel supply line with a suitable hose and lower it into a container. Have your assistant crank the engine over with the starter.
If gasoline is flowing, then the fuel pump is working properly. If not, read about this situation later in the section «Source of faults - fuel supply». Then the fuel injection remains the source of the malfunction. Or the pump is running, but not producing enough pressure.
Visual inspection first
- Is the wire connector disconnected at the ignition or injection system nodes?
- Check the tightness of the ignition wire on the ignition coil, on the distributor (engine 1.6 l 74 kW) and on spark plugs (never turn on the ignition!).
- Are all low-pressure hoses in the engine compartment fitted to the appropriate fitting?
- Water condensate on and in the distributor cap (only with 1.6 l 74 kW engine)? All parts of the ignition system, including the ignition coil, must be clean and dry, otherwise there is a risk of creeping currents and voltage breakdowns.
- Smell of gasoline in the engine compartment? Is the fuel hose leaking or is it completely disconnected?
Source of faults - electrical equipment
- The control lights on the dashboard do not light up or do not flash when the ignition is on: the battery is completely discharged or the battery terminals are disconnected.
- The control lights go out when the starter is activated: the battery is very discharged, or it is old, or there is a short circuit in the starter.
- When the key is turned, the control lights dim a little, the starter does not turn: the electromagnetic switch is jammed, or it is faulty, or the starter is faulty.
- Control lamps burn brightly or flash when the key is turned; the starter does not turn: defective contact of terminal 50 In the ignition switch, the wire of terminal 50 of the electromagnetic switch is disconnected or the electromagnetic switch is faulty.
Source of faults - ignition
- All connectors in the coil area are correctly connected (coils) ignition and ignition distributor (engine 1.6 l 74 kW)?
- Cracks in the housing of the ignition coil or in the housings of the ignition coils, traces of burns from sparks during breakdowns?
- Only with 1.6 l 74 kW engine: remove the distributor cap. Are traces of creeping currents visible on its inner side? Does the graphite brush spring in the middle of the lid flawlessly? Is there a verdigris on the contact pins?
- As a last resort, only a complete check of the ignition system will help.
Source of faults - fuel supply
- No gasoline in the fuel tank is not as ridiculous as you might think. In our injected engines, the lack of fuel first manifests itself in the form of engine misfires when cornering.
- Fuel pump defective.
- The fuel filter is clogged.
- With normal fuel supply - for example, with constant problems with starting the engine - suspicion falls on the injection system.
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