What is a VVT gear?
More & more vehicles are equipped with VVT cam gear to improve fuel economy performance. The electronic technology allows right amount of oil supply to get into engine via variable valve timing solenoid adjustment. Automakers have their own names to this technology. Ford calls it Variable Camshaft Timing, VCT.
How does a Toyota timing chain tensioner work?
Both the primary and secondary chain tensioners use a spring and oil pressure to maintain proper chain tension at all times. They suppress noise generated by the timing chains. The primary chain tensioner is the ratchet type with a non-return mechanism.
Can a variable valve timing control ( VTC ) be replaced?
The variable valve timing control (VTC) actuator is defective. CORRECTIVE ACTION Replace the VTC actuator. This procedure does not require the complete removal of the cam chain and associated parts, so repair time is much shorter. TOOL INFORMATION Tool Name Tool Number Quantity Stopper (lock pin) 14511-PNA-003 1 Tappet Adjuster
What causes the variable valve timing control actuator to be defective?
POSSIBLE CAUSES The variable valve timing control (VTC) actuator is defective. CORRECTIVE ACTION Replace the VTC actuator. This procedure does not require the complete removal of the cam chain and associated parts, so repair time is much shorter.
How to repair a VTC actuator on a car?
1101Z9 Replace the VTC actuator. 2.0 hrs 03214 04216 16-012A 14310-R44-A01 Skill Level: Repair Technician DIAGNOSIS If viewing this service bulletin on SIS and your computer has sound, click on the picture below to hear a sample of the engine’s rattle.
How does the PCM control the VVT solenoids?
The PCM controls the VVT solenoids based on input from various sensors. Typically, there’s one VVT solenoid for each actuator. Some vehicles only have an actuator on the exhaust camshaft or the intake camshaft, while others have actuators on both.
What does variable valve timing ( VVT ) do?
Variable Valve Timing (VVT) is used to vary engine performance and enhancements. On dual cam systems, the PCM controls the amount of variance on both cams separately. There are two actuators in the system; one for the exhaust cam and one for the intake cam.
How does a vane type VVT system work?
The vane type VVT system utilizes the camshaft position solenoid actuators to manipulate oil pressure to the cam phasers. The Camshaft Position Actuator Solenoids are sent a 12v signal which is pulse width modulated.
How does the camshaft advance actuator system work?
With the signal received from the PCM, the solenoids actuators open allowing engine pressure to enter either one of the two passages; camshaft advance or camshaft retard. Since the solenoid is pulse width modulated, the system can vary camshaft position between its two limits (25 or 50 degs depending on system).
Will a bad VVT?
A faulty VVT switch will also cause the engine to misfire or appear to stumble when your vehicle is loaded with extra weight, climbing hills, or when you apply quick pressure to the throttle for instant acceleration. If you ignore the problem, the potential of further engine damage will increase.
Why does my VVT rattle when I start the car?
In certain cases, the VVT gear housing and sprocket could separate and result in the engine stopping while the vehicle is being driven, increasing the risk of a crash. Toyota theorized that the condition could be related to an engine noise issue at start-up being investigated on certain engines.
What makes the intake noise on a Toyota Corolla?
Toyota Intake baffle rattling causing engine noise making the car sound horrible and like a diesel engine, fixed using a few screws – so simple.
How do you fix the intake manifold on a Toyota Corolla?
1. you can do this with the manifold still on the car if you want and put two screws in from the top or you can do by taking the manifold off the car and putting screws in from the other side of the manifold. The screws need to go in at an angle to catch the baffle inside the manifold. 2.