Toyota 4 Runner Common Problems and Solutions
Lack of power/misfiring
Problem:
You maybe noticing issues with the engine misfiring and/or experiencing a real lack of power when driving. These are common symptoms of a coil pack failure.
Solution:
If you replace the coil pack this should resolve the issue.
Difficulty level
Coil Pack
ABS warning light
Problem:
If you have noticed that the ABS warning light has switched on the dashboard, then it is most likely caused by a faulty ABS Sensor.
Solution:
You will need to identify exactly which ABS sensor is causing the fault by having a diagnostic check. Once you have identified exactly which sensor is faulty, you will need to replace it to rectify the situation.
Difficulty level
Head gasket failure
Problem:
The second generation 4Runner is known for having problems with the cylinder head gasket blowing. This problem was a recall issue which meant that Toyota should have fixed it free of charge. Even with this in mind, they still do not last as long as would be expected.
Solution:
Fitting a replacement cylinder head gasket will fix the problem.
Difficulty level
Cylinder Head Gasket
Gearbox problems
Problem:
If you want to protect your gearbox and make sure that it lasts as long as possible you must change the transmission fluid on a regular basis. A common symptom of a gearbox that needs the transmission fluid changed is poor gear changing.
Solution:
As mentioned above, you need to change the transmission fluid regularly. Watch the video below to see how this is done:
Difficulty level
Rough idling
Problem:
The Toyota 4Runner is prone to rough idling issues due to a problem with the MAF (Mass Airflow Sensor) sensor. The engine should idle at a constant speed, but if this is the problem it will a have an irregular idle. The rpm needle will be moving up being caused by the engine revving up and down.
Solution:
If you remove the MAF sensor and clean it with good quality carb cleaner, this should fix your problem. You can watch the video below to see how this is done.
Difficulty level
Mass Airflow Sensor
