Hello, everyone.
I have a 2008 KIA Magentis (the European KIA optima, few differences with the USA model : manual, 2l motor, drive by cable, immobilizer...). I bought it used at about 65k miles and it is now 75k.
When accelerate at low rpm (about 1400) it makes a weird ratling sound, similar to the sound of the pebbles falling inside a "rain stick", especially in third gear.
Not happening while reving, at idle or at higher rpms...
I had this issue for months but can't find where it comes from so I'm asking for advices before giving up and handing it to my mechanic...
The pvv valve has been replaced, the CVVT actuator replaced after obd codes were triggered.
I replaced the intake manifold because I had a big leak and I noticed the valves had a pretty bad carbon buildupbuildup, especially on the leak side.
My oil consumption is on the high side BTW .
My car has a e85 conversion kit (needed to be street legal here...).
Any idea on how I can troubleshoot it ?
Thank you
The engine is worn out from the pistons slapping against the cylinder wall. Have a dry/wet compression test done on that motor.
@kp sounds bad... Where would this noise comes from ? And why the pistons would have slaped against the cylinder walls ?
Inside the motor.
That's pretty broad... I tried to find this noise on youtube and after watching dozen of videos I haven't found one, I will try to record it.
I think it could be the injectors as using ethanol may have clogged them by removing any dirt in the fuel system...
I thought they were undersized but going to either "standard" fuel or even higher octane doesn't change the sound. It helps with starting it tho.
Poor quality from Kia.
Be aware that it is a Korean made car with first Theta engine (g4ka) and not a Mexican built car with the unreliable Theta II engine.