thebigkendo:


You DM me??

Kashif:
Easy, easy, easy.... calling out Radautoworks and Gazzuzz especially

I would advise you both post no more here, as it is getting a little personal.



Peace.

GAZZUZZ:



. apply due diligence. 0803 768 9211

GAZZUZZ:


I can not give an informed answer. More details required. Was the timing cover opened? Where you testing with the tensioner fitted or not? We're you turning engine clockwise?

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.

Inception:
there is an OCV strainer on that engine. locate it and clean it.

it is usually at either the alternator end or power steering pump end on the engine block.

another issue may be that timing has not been set properly.

GAZZUZZ:
I will give this quick lecture on fuel consumption and sludge, how they relate.

Newer cars from 2002-date have variable valve timing systems, these systems work with oil flow/pressure to determine timing settings. You will notice most engine covers with inscriptions like VVTI IVTEC, CVVT etc... its all same technology every one just wants a special name tag.

Now here's the snag.




You buy a happy toks car, it's a sprinter.... 0-60 in 10secs ( it's a bloody Corolla) 6months later it stops sprinting, 1 year later it's a log of wood and engine vibrates when ac is turned on, finds it difficult to climb hills and fuel consumption has almost doubled.

Now here's a bit of what happened (Nigerian 20w50 sludge context)

The timing settings are set to a retar.ded position when inactive or without any instruction from the ecm. With sludge in the mix, it is almost always in 1 position. The OCV (oil control valve)has oil strainers that keep dirt out of the device, and once engine develops a sludge issue oil flow stops. Engine will not throw a rod, but timing setting become epileptic, or get stuck in a retar.ded position, making the engine very in efficient.

Pics below show what the OCV oil strainers will look like when engine has mild, sludge, and when it is clean.

So take out time and clean your OCV strainers, you will get better fuel mileage.

AutoElectNG:


Given your question about the way forward and not linking wrong oil to sludge, please take the time to go through this thread

https://www.nairaland.com/3842959/need-professional-advice-n-mechanic

Like I said before to pin it down on wrong oil, a physical inspection as suggested by the poster immediately above is the way to go

mayor2013:


Check for sludge first by opening valve cover. Are you sure you are not the engineer handling this job

Aladine:
I just had to go through my phone to be sure. Sorry i have mxed you up with ikenna..i actually contacted you through mail and you replied but i didn't get your number yet.

mayor2013:
Wrong oil problem. Any unusual noise at cold start or hot start

AutoElectNG:


That could cause this...wrong oil viscosity run long enough

AutoElectNG:


Is that the first usage of 10w40? By the way wrong oil viscosity is just one possibility there are others....only physical inspection will zero in on the actual cause.

AutoElectNG:


10w40?

How many miles since last oil/filter change?

com1234:
Total 5000 ....though planning to change to synthetic i am afraid of complications with abrupt change.

AutoElectNG:
Vehicle history before this codes popped up?

Sounds more mechanical than electrical something to do with the Variable Camshaft Timing and the associated solenoid not working according to specification

Location?