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Why does my car make a rattling noise on cold start?
A loud rattle type noise may be noted from the engine after a cold start. This can be caused by a faulty valve timing control actuator. Replacing the failed actuator will commonly correct this noise issue.
What causes VVTI rattle?
The sound is caused by locking pin failing to lock the gear and the rattle until oil pressure is built up.
Is VVT rattle bad?
VVT rattle is the varuable valve timing sproket rattling, no big fuss, very rarely effects performance.
Why does my engine rattle when I start it?
One common problem that will cause a rattle at idle is a failing hydraulic valve lifter. If you hear a “clack-clack” kind of rattle when you start your car’s engine, it could be a sign of piston slap. Pistons move up and down in their cylinders with a tight fit between the piston and cylinder wall.
What are the symptoms of a bad VVT actuator?
Symptoms of a Bad or Failing Variable Valve Timing (VVT) Solenoid
- Check Engine Light comes on. Since today’s modern cars are controlled by an Engine Control Unit (ECU), virtually all individual components are monitored by the ECU.
- Engine oil is dirty.
- Rough engine idle.
- Decrease in fuel economy.
Why does my Toyota VVT rattle when I start the car?
Through reproduction testing, Toyota confirmed that, with the lock-pin disengaged during a cold engine start, the impact force between the VVT internal component and the housing could become larger if engine oil, which is pumped into the VVT unit to control the position of the camshaft, drains back into the oil pan while parked.
Why does my Lexus V6 rattle when I cold start the car?
The first cold start of the morning some Toyota and Lexus V6 owners, especially those who have the 2.5L or 3.5L V6, notice a loud rattle the first few seconds after startup. The noise disappears after the car builds oil pressure. The most common cause is the variable valve timing camshaft gear assembly leaking down oil pressure as it sits.
Is the VVTi cam gear cold startup Rattle harmful?
Your mechanic sounds like a meme. He replaced everything timing related that was not the problem when clearly there is a manufacturing defect with the VVT-I gear. If he looked it up on google it is not hard to find the TSB Toyota posted back in 2013 addressing this exact issue.
Is there a recall on a Toyota cold start engine?
If you experience this noise from your engine, CARspec is happy to confirm the condition at no charge. As a Toyota and Lexus specialist we see these engine more often then most auto shops and can get the condition repaired quickly, or if applicable direct you to the local dealership for recall work or warranty repair.