1. Open the hood and ensure the reliability of connection of tips of wires to the battery terminals and no rust on them. If you notice signs of corrosion or damage, replace or clean the wires. Likewise, check all the tires ground, making sure that they provide a reliable contact (mating surfaces must be absolutely clean and free from rust) with a body or engine.
2. After this, carefully inspect all visible wiring sandwiched within the engine compartment. Ensure the reliability of all connections. At this point you are interested obviously damaged wires. They can be cut or peret?�rty on sharp or moving engine parts, such as suspension parts or drive belt. Wire breakage may occur as a result of careless installation of any node. The wire can melt upon contact with the exhaust system. The most likely cause of damage is improper wiring harnesses laying it in the engine compartment after the repair or maintenance of any node.
3. Cables can be damaged or shorted without damage to their insulation. In this case, check to nothing lead. Such damage can occur after pulling wires or improper placement of the wiring inside the engine compartment. If you think that such damage may check carried out following the sequence described below.
4. A damaged cord can be repaired, soldered into the fracture length of the new wire. Soldering is required to obtain a reliable contact. Isolation is possible to restore a sufficient amount of electrical tape or shrink tubing. If the damage is significant and the damaged wire plays a significant role, most true output (although quite expensive) is to replace the corresponding harness new.
5. After the restoration of the damaged wires in the correct position in the engine compartment, away from rotating and hot components. Do not forget to secure the wire in the intermediate place (if any).
6. Ensure the reliability and cleanliness of all available connectors. All catches must be installed. If the inner surface of the connector you will notice traces of corrosion (white or green deposits and rust) or excessive pollution, remove it from the appropriate terminals and clean them. For this you can use a special spray. If the connector is damaged seriously, it should be replaced. Keep in mind that in some cases you'll have to replace the wiring in its entirety.
7. If you could completely remove corrosion from the connector, fill it with preservative grease, then reinstall it. Type of grease, you can learn in the workshop.
8. On all models the sensor crankshaft position (with the help of determined and TDC of the first cylinder). His working part may be contaminated by oil or dust, which can lead to malfunction and, accordingly, to misfire.
9. Inspect all vacuum hoses and tubes located in the engine compartment. Make changes and tightening clamps for cracks, delaminations and signs of damage to the hoses themselves. Also make sure that none of the hoses are not squashed by not bent too much, that is, do not miss the air. Pay special attention to hoses located near the sharp edges and ends of all hoses. All the damaged hose must be replaced.
10. Make sure that there are no signs of damage and contamination in the crankcase ventilation hoses. Also make sure that they are not blocked from the inside. The number and location of the hose system depends on the vehicle model, but all models installed hose that connects the upper part of the engine air intake hose and intake manifold. Hoses connect the system and the engine block (or the oil filler neck) to the intake manifold. These hoses deliver oil vapors into the combustion chambers. A dirty or blocked hose of the engine is unstable (especially at idle).
11. Following from the fuel tank through the fuel filter to the fuel distribution line along the fuel lines, carefully inspect them. If you find signs of damage or kinks, replace the corresponding section. Pay special attention to places of connection tubes. They may appear cracked, leading to fuel leakage.
12. Remove the air cleaner cover and inspect the item. It should be relatively clean and dry. Heavily contaminated cleaner has a strong resistance to air flow, which leads to a marked reduction in engine power. Replace the air cleaner if necessary.
13. Start the engine and let it run at idle.  | Attention! When performing any work in the engine compartment with the engine running, be extremely careful. In addition to the high probability of burns from incandescent engine parts or the exhaust system, you run the risk of serious injury from rotating parts (eg cooling fan, or drive belt). Before you begin, first of all, take care and follow the safety instructions described at the beginning of each chapter. Watch your hands, do not let the long hair or clothes in the engine compartment. Stay away from the exhaust system and other hot components. |
14. Following up on the air inlet and then to throttle, make sure there are no leaks from the air hose (including nearby vacuum hoses). They can be detected by the characteristic whistle. If you do not hear a whistle, apply a small amount of soapy water on a suspicious section of hose. If the hose is damaged, the nature of the engine change, and the treated surface of the hose will bubbles (or, depending on the pressure in the hose, water may be absorbed orally). If a leak is detected securely tighten the clamp or replace the damaged hose.
15. Likewise, check the entire exhaust system (from the collector to the rear section). Check for gas leaks. To facilitate the work, you can raise the vehicle on a lift, installed on a rack or over the pit. To carry out the most simple test plug the outlet of the exhaust system and listen to the system. If you hear a characteristic whistling, there is a leak. If a leak is detected, tighten the corresponding clamp bolts or nuts, replace the gasket or burned-out section.
16. Further testing is alternately moving each connector to the appropriate terminals with the engine running. This unreliable contact is determined to change the character of the engine. Restore the contact reliability, replace or clean the appropriate connector. Keep in mind that in some cases have to change the whole wiring.
17. If the preliminary checks you have not found the cause of unstable operation of the engine, the car should be driven away on a service for a more detailed diagnosis using special equipment. |
