Toyota RAV4 engine misfiring at idle

Tool:

• Collar for end nozzle
• Nozzles on the collar
• Candle Gap Gauge
• Screwdriver flat medium
• stroboscope
• rags
• Compressometer

Parts and consumables:

• Spark plug
• High voltage wires of the ignition system
• intake manifold gasket
• Throttle Body Gasket

Notes:

If you find misfires (unstable engine operation) when the engine is idling, check the engine parts and mechanisms to find the cause of the malfunction and eliminate it.

1.  Check spark plugs for wear or incorrect gap. How to remove candles is written in the first part of the article  here . Then check the gap of each spark plug with a spark plug gap gauge. Replace defective spark plugs with new ones.

2.  Faulty high voltage spark plug wires can also cause the ignition system to become unstable. Therefore, check the wires for cuts, breaks, etc. Replace defective high voltage wires.

3. While inspecting the vehicle, you may find a vacuum leak through the intake manifold gasket or throttle body. Repair the problem by replacing the appropriate gasket with wrenches (the inlet pipe clamp is removed with pliers). 

4.  Check the correct setting of the ignition timing using a stroboscope, after cleaning the mark on the pulley (so that you can "catch" it in the stroboscope) with a rag. Or contact a specialist service center.

5.  Then check the compression in the cylinders and compare it with the values ​​given in the technical documentation, because uneven or low compression in the cylinder can also cause unstable engine operation. How to check the compression in the engine cylinders is written  here .

6. The reason may still be a failure in the fuel injection system. To find the exact problem and fix it, contact the service center for specialists.

The article is missing:

• Tool photo
• Photo of parts and consumables

Source:  carpedia.club