In order to determine if there is a spark, you need to unscrew the spark plug, insert it into the plug of the candle and press it to the ground. At the same time, do not hold the candle plug or high-voltage wire with your hands, but use insulated clamps. Have an assistant turn the engine over with the starter.
Caution: To prevent damage to the catalytic converter, petrol must not be injected. To do this, pull out the fuel pump relay.
Attention: Precautions must be observed when working with the electronic ignition system. For a diesel engine, the pre-heating system and the fuel system must be checked.
If the engine «rapped»
Knocks from the engine compartment, which increase as the oil warms up, are a sign of engine bearing failure.
Causes
Insufficient lubrication due to too low oil level.
Water ingress into engine oil due to a blown cylinder head gasket.
RPM too high with cold engine and hence viscous oil.
Breakdown of the oil film on parts at high oil temperatures, for example, due to improperly selected oil viscosity.
What to do in case of engine bearing failure
First of all, you need to know that connecting rod bearings most often fail. If you were able to recognize a bearing failure at an early stage, then you may be able to get by with replacing the liners. That's why:
- If you hear sharp knocks from the engine compartment, immediately turn off the engine and do not start it again! In addition to knocking, the oil pressure indicator light often lights up.
- Have the car towed to a workshop.
- If the engine «younger» 100 thousand km, then it may be possible to get by with a partial repair.