Franklyspeakin:
What's the name of your car,
engine spec,
what is also the name of the part changed?.

Did you stay with him during the change or did he do the change in your absence.
I hope you catalyst hasn't been removed.

PointZerom:
He must have tampered with the catalyst.

izaac23:

I drive Corolla 2003, My mechanic told me that my timing chain is weak when I went to service my engine.

He loosed this part (pics attached) from the back of my engine and took it to a welder, I don't know wat the welder cut or weld into it, he brought it back, sand paper it and fix it.

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.

diportivo:
awon werey welder


it's not their fault

werey kazeem took the stuff to them to weld it

werey pipo everywhere

izaac23:
I drive Corolla 2003, My mechanic told me that my timing chain is weak when I went to service my engine.
But he said he can do something to adjust it from the back of my engine to be alright, so I allowed him.
He loosed this part (pics attached) from the back of my engine and took it to a welder, I don't know wat the welder cut or weld into it, he brought it back, sand paper it and fix it.

Since then, the sound of my engine changed and start grunting a bit louder when I start the engine, but normalize when the engine settles, but grunt on motion.

My vehicle engine is always quiet, but after wat he did, I can hear the sound of my engine from the inside when I drive it.

Pls I need help, wat is the consequence of wat he just did, and wat can I do about it. Gurus help me pls. Thanks.

GAZZUZZ:


You have worn our timing chan, timing chain guards, and most likely vtc actuator.

What the mechanic did was to extend the factory length of your tensioner (longer "d" so it can hit the sweet spot) so the chain will not rattle, unfortunately I don't know how long this will last.

Bite the bullet and do a proper job by opening the timing chain cover, examine the parts that are worn and replace them.

Good luck.

izaac23:


This was what he said, but before this, I never noticed any rattling in my engine, now if I ramp up the engine, I hear rattling on one side of the engine where he tampered with.

Pls if I remove the part in the picture he welded and fixed back, buy another one and fix, will it stop??

Secondly how old do we think that part will cost me?

izaac23:


Here is the part am referring to

GAZZUZZ:


You have worn our timing chan, timing chain guards, and most likely vtc actuator.

What the mechanic did was to extend the factory length of your tensioner (longer "d" so it can hit the sweet spot) so the chain will not rattle, unfortunately I don't know how long this will last.

Bite the bullet and do a proper job by opening the timing chain cover, examine the parts that are worn and replace them.

Good luck.

Cokahot:
There is no perfect mechanic in naija again. They are all quacks..... now my radiator is leaking g and temp guage rising to almost middle. I will forcefully take out the radiator later this evening and mend it with super glue. Me don taya for quacks

buygala:


That's how yesterday, I took my car to a highly recommended car radio "expert" to help me install a subwoofer...

While doing that, he had to take apart a part of the car dashboard panel housing the radio and AC buttons...Dude did a nice and neat job with the subwoofer installation..that worked perfectly

Only problem was that I discovered at night that my car's ac button night lights were no longer working ..Somehow guy managed to install subwoofer and uninstalled my ac button illumination lights


Somehow, Naija mechanics always manage to install a new problem after solving an old one ... Maybe it's part of the ethics of their profession.."Never forget to install a new problem after solving an old one"

We rise by forgetting others

GAZZUZZ:


We rise by forgetting others

buygala:


That's how yesterday, I took my car to a highly recommended car radio "expert" to help me install a subwoofer...

While doing that, he had to take apart a part of the car dashboard panel housing the radio and AC buttons...Dude did a nice and neat job with the subwoofer installation..that worked perfectly

Only problem was that I discovered at night that my car's ac button night lights were no longer working ..Somehow guy managed to install subwoofer and uninstalled my ac button illumination lights


Somehow, Naija mechanics always manage to install a new problem after solving an old one ...Maybe it's part of the ethics of their profession.."Never forget to install a new problem after solving an old one"

TRYGO:
Welcome to NL.
Some questions for you:
1. How many miles on the odometer?
This would help us determine the age of your engine internal components, and hence the noise (if perhaps there was any before you took the vehicle to the mechanic).

2. Was there any engine noise before you went for an oil change?

What was that thing he welded from your picture?
What he welded is called a timing chain, autotensioner.
It is spring loaded intern, and operated using engine oil pressure.

Consequences of what he has done?
They are extremely grave here dude; if not quickly corrected, would lead to engine failure (knock).

This would happen in your case, since the plunging action of the auto tensioner, has been permanently arc welded. This increases more than enough stress on the valve train components, leading to engine failure.

You want proof of the above paragraph?
Here we go!

** Drain that oil, and you'd see aluminum filings there, which would definitely clog the oil pump filter, etc.

** Valvetrain components would be already worn out before now.

The fix?!
** Drain that oil, if you've not driven the car for a while now(loads on engine, etc)
This would help reduce or eliminate all the aluminum fillings that might have been lodged in the engine. Do this one or two times, with a new oil filter, and engine oil refilled.

** Replace that timing chain, auto tensioner (what he arc welded).

** Replace the VVTi(camshaugears), if that hasn't failed yet. Be absolutely sure that, the noise you may have had, before you took the vehicle to him, was not a cold start VVTi problem.


Hope this helps you fix that engine.
Hope this helps you out there.

TRYGO:
@izaac23.
1. You're not to drain and refill with a synthetic as the case maybe now. Use conventional mineral oil, just for the drains, then you could revert back to your synthetic oil.

2. Auto tensioner is easily seen, and that's the pictures you posted here.

3. How much would it cost? Well, depends on the technician you're working with, and whether if you're buying new, or used.

Cokahot:
I swear. One tampered with my plastic gear cover,suddenly my passengers side speaker stopped working. Called a technician, he opened the door panel,nothing was disconnected. Without a multimeter, he said its condemned and should buy a new one. Most mechanics aren't and weren't to be one,they forced themselves to be one based on no job or lik to no education. Mechanics,rewires and what have u are all trial and error,while doing that some parts,plastics ,plugs and all would be damaged in the process. Esp if your car sleeps there. Your own don be

buygala:


It's sad

Yesterday, I had to pay another rewire 3k to fix the dashboard lights that the radio guy spoilt

Turned out that in the radio guy's hurry to couple back that dashboard panel after the subwoofer fix, he stretched and cut some wires, leading to the dashboard lights malfunction

The one who fixed the radio guy's carelessness further broke one of the panel's clips while coupling other back ...E come dey tell me say "Oga na so I meet am. E don break before..but leave am like that, e no mean." ...I had to cough out another 5 huns for another clip before the panel sat well...

Nigerian car technicians and mechanics are spawns of the devil ..they give with one hand and take with the other

Devil friend how far?

GAZZUZZ:


Devil friend how far?

buygala:



I am presently in the business of avoiding you mecho people

Radio guy and rewire don do me enough shege for 3 months

We just started, the tyre repair guy go help us forget to tight 1 wheel well

GAZZUZZ:


We just started, the tyre repair guy go help us forget to tight 1 wheel well

TRYGO:
Welcome to NL.
Some questions for you:
1. How many miles on the odometer?
This would help us determine the age of your engine internal components, and hence the noise (if perhaps there was any before you took the vehicle to the mechanic).

2. Was there any engine noise before you went for an oil change?

What was that thing he welded from your picture?
What he welded is called a timing chain, autotensioner.
It is spring loaded intern, and operated using engine oil pressure.

Consequences of what he has done?
They are extremely grave here dude; if not quickly corrected, would lead to engine failure (knock).

This would happen in your case, since the plunging action of the auto tensioner, has been permanently arc welded. This increases more than enough stress on the valve train components, leading to engine failure.

You want proof of the above paragraph?
Here we go!

** Drain that oil, and you'd see aluminum filings there, which would definitely clog the oil pump filter, etc.

** Valvetrain components would be already worn out before now.

The fix?!
** Drain that oil, if you've not driven the car for a while now(loads on engine, etc)
This would help reduce or eliminate all the aluminum fillings that might have been lodged in the engine. Do this one or two times, with a new oil filter, and engine oil refilled.

** Replace that timing chain, auto tensioner (what he arc welded).

** Replace the VVTi(camshaugears), if that hasn't failed yet. Be absolutely sure that, the noise you may have had, before you took the vehicle to him, was not a cold start VVTi problem.


Hope this helps you fix that engine.
Hope this helps you out there.