GAZZUZZ:
you startup a modern day vehicle from cold start, it rattles for a few secs (kakakakakakakakakakaa) then noise goes away like nothing happened. No performance issues, no noise. But when ever vehicle stands still inactive for about 5-6hrs and you startup again, you have the startup rattle.

If you have this problem, it is almost certain you have a defective VTC actuator.

VTC stands for Variable Timing control, As engine rpm builds, the VTC actuator - controlled by the engine computer that monitors cam position, ignition timing, exhaust emission and throttle position - advances or retards the intake cam throughout a range , optimizing engine output and reducing emissions.

So in summary, the intake camshaft is not static, but variable.

When defective it rattles for a few secs until a buildup of oil pressure keeps it stable, so basically it's inability to hold oil makes it rattle for a few seconds.

Causes of this defect could arise from the use of wrong oil grades (20w50 people unna weldone) and Defect in production.


Now here's the interesting part of this topic.

Once in a while I used to receive vehicles with very quite engines but re.tarded or advanced timing error codes on the engine computer, after advanced diagnosis we would notice that the intake VTC cam was welded firmly in place it was very common in the corrolas with the 2zr engines, and the honda with the K24Z engines, the symptoms exhibited were a terrible loss of power and correlation codes on timing.

So now that you know, before you buy that Nigerian used car, if you notice any funny timing codes and a previously breached timing cover just know that VTC might be welded in 1 position.

wane01:
Been having this stuff with my 2012 corolla ....
The noise lasts for a while steaming the engine very early and disappears when immediately D is engaged . I also noticed the rattling is more on Monday since i use the car to go to the office only hence its Idle weekends.

(20w50 people unna weldone)

GAZZUZZ:
you startup a modern day vehicle from cold start, it rattles for a few secs (kakakakakakakakakakaa) then noise goes away like nothing happened. No performance issues, no noise. But when ever vehicle stands still inactive for about 5-6hrs and you startup again, you have the startup rattle.

If you have this problem, it is almost certain you have a defective VTC actuator.

VTC stands for Variable Timing control, As engine rpm builds, the VTC actuator - controlled by the engine computer that monitors cam position, ignition timing, exhaust emission and throttle position - advances or retards the intake cam throughout a range , optimizing engine output and reducing emissions.

So in summary, the intake camshaft is not static, but variable.

When defective it rattles for a few secs until a buildup of oil pressure keeps it stable, so basically it's inability to hold oil makes it rattle for a few seconds.

Causes of this defect could arise from the use of wrong oil grades (20w50 people unna weldone) and Defect in production.


Now here's the interesting part of this topic.

Once in a while I used to receive vehicles with very quite engines but re.tarded or advanced timing error codes on the engine computer, after advanced diagnosis we would notice that the intake VTC cam was welded firmly in place it was very common in the corrolas with the 2zr engines, and the honda with the K24Z engines, the symptoms exhibited were a terrible loss of power and correlation codes on timing.

So now that you know, before you buy that Nigerian used car, if you notice any funny timing codes and a previously breached timing cover just know that VTC might be welded in 1 position.

NobleEngineer:
exactly wetin dey do one of my corrollas, the 2000model...cold start kakakakakakak!!! I go just ignore am dey fire the motor dey go

HenriXI:



This is a very interesting topic to me because I'm currently having a similar experience with my 2010 corolla S (with 2ZR engine).

I have this rattling kind of noise for the engine compartment many times when i startup the car in the morning and also when I'm leaving the office at close of work after the car had been parked since morning.

It doesn't happen when the car is in use throughout the day (that's after it happens on first startup). Until its parked for a long time.

I did some research and realised it's a factory issue that can be corrected (TSB attached).

Please can you give me a quote on the parts I'll need, and the cost. Cuz I'm not in Lagos but we can work something out and you waybill the parts to me.

Thanks in advance.

GAZZUZZ:
you startup a modern day vehicle from cold start, it rattles for a few secs (kakakakakakakakakakaa) then noise goes away like nothing happened. No performance issues, no noise. But when ever vehicle stands still inactive for about 5-6hrs and you startup again, you have the startup rattle.

If you have this problem, it is almost certain you have a defective VTC actuator.

VTC stands for Variable Timing control, As engine rpm builds, the VTC actuator - controlled by the engine computer that monitors cam position, ignition timing, exhaust emission and throttle position - advances or retards the intake cam throughout a range , optimizing engine output and reducing emissions.

So in summary, the intake camshaft is not static, but variable.

When defective it rattles for a few secs until a buildup of oil pressure keeps it stable, so basically it's inability to hold oil makes it rattle for a few seconds.

Causes of this defect could arise from the use of wrong oil grades (20w50 people unna weldone) and Defect in production.


Now here's the interesting part of this topic.

Once in a while I used to receive vehicles with very quite engines but re.tarded or advanced timing error codes on the engine computer, after advanced diagnosis we would notice that the intake VTC cam was welded firmly in place it was very common in the corrolas with the 2zr engines, and the honda with the K24Z engines, the symptoms exhibited were a terrible loss of power and correlation codes on timing.

So now that you know, before you buy that Nigerian used car, if you notice any funny timing codes and a previously breached timing cover just know that VTC might be welded in 1 position.

BamBamK:
my 2009 Honda accord evil spirit does this. learnt a hundred grand will correct it. don't have funds to spare jare.

what's the long term implication??

GAZZUZZ:


discomfort

weyreypey:

Proudly 20W50 no regrets.... That's OUR oil.