Symptoms of VVT rupture

common symptoms that suggest a bad VVT valve:

1. Rough engine idling
Proper ignition timing is critical to ensure that the engine runs smoothly and efficiently. When the vehicle is under load, the VVT switch will monitor the engine and send information to the computer to adjust the valve timing as needed. However, when the switch is not functioning properly, its ability to send accurate data is compromised. Although this unit is only supposed to work under non-normal driving conditions, it can cause the vehicle's engine to run rough. If you notice that the engine has erratic idle speed, particularly if the engine speed rises and falls from 100 to 300 RPM at idle, contact a local ASE mechanic as soon as possible.


2. Check Engine Light
The Check Engine Light is activated whenever one of the multiple warning codes has been produced by the vehicle's ECU. Since the VVT switch is an electrical component, it is constantly monitored by your car's on-board computer. When it fails or is sending inaccurate data, this will alert your car's computer to a potential problem and turn on the check engine light on your dashboard. Whenever the check engine light comes on, you should always contact a local mechanic to inspect your car, diagnose the problem, and correct what's broken. In the case of the VVT system, however, there are multiple warning codes that could indicate a specific problem, so it's best to work with a local ASE-certified mechanic who has the correct diagnostic tools and access to factory codes so they can properly repair what's broken .


3. Motor stumbles when going uphill or under load
A faulty VVT switch will also cause the engine to overspeed or appear to stumble when the vehicle is loaded with extra weight, going uphill or when applying quick pressure to the throttle for instant acceleration. This is commonly caused by an electrical problem with the switch and not always the switch itself. If you notice this problem and contact a local ASE certified mechanic to inspect the problem, chances are they won't have to replace the variable valve timer. However, proper diagnosis is required to verify that it is a problem elsewhere. If you ignore the problem, it will increase the potential for further engine damage.

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