Top End Engine Rattle/Knock

Eric Mechanic Avoca, New York Posted   Latest  
Question
Driveability
Drivetrain
2012 Kia Forte Koup EX 2.0L (2) 6-spd (M6CF3-1)
Top End Engine Rattle/Knock

Look for a little guidance. 133k on the clock and bought from the auction so no back story on this one. The engine has what appears to be a top end rattle noise that stays the same hot and cold. It appears to be around the timing chain area. So far I have disabled injectors one at a time and did not hear a change in the sound. I also actuated both cams with engine running and heard no change in sound. I tried running the vehicle with the valve cover off but the amount oil oils pumping out of it made that impossible not to mention a huge mess. Looking at the engine with the valve cover removed it was very clean and nothing, ie. cams, shims, bearings etc. looked worn or loose.

I am not looking for a silver bullet but short of a tear down and inspection is there any other "tests" so to speak that could be done to help isolate a noise like this? Have you seen any common failures with these symptoms?

Cheers!

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Rassiel Technician
Tampa, Florida
Rassiel
 

Hey Eric big fan here keep up the good work, im on the hyundai side and we use this engine as well, they are actually pretty good and the noise you describe could be CVVT related, monitor actual vs desired for both cams while driving, I have also seen collapsed lifters causing a similar issue and last but not least have also seen wrist pins making a similar noise and can be a bit tricky cause it…

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Martin Diagnostician
Burleson, Texas
Martin
 

Super mario has a video that he found a wrist pin noise by rolling the cylinder just past tdc so it's on the down stroke, then he was able to put pressure on the piston with a long extension through the plug hole and was able to reproduce his noise. Maybe try that to rule out lower end... HTH

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Jonathan Technician
Digby, Nova Scotia
Jonathan
 

These engines are known for knocking. A common issue is the cylinders getting scored and it will cause a knock, usually louder when coming down in rpms. I use a borescope and look into the cylinders, the scoring is usually on the firewall side of the cylinders. This may not be your issue but the knock often sounds like it coming from timing chain area

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Jamey Owner/Technician
Ventura, California
Jamey
   

Does TSB Pl1803W/X apply?? Is code P1326 stored? if so, there is a lifetime replacement on the engine. This TSB does not list the Forte, but it does list the 2.0l engine , it’s worth a call to see. static​.​nhtsa​.​gov/odi/tsbs/2019…​.​pdf

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Rassiel Technician
Tampa, Florida
Rassiel
 

Pretty sure this is jot a theta engine so tsb does not apply

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Joseph Technician
Lexington, South Carolina
Joseph
 

I laughed so hard the first time I got one of these in with that code and read the tsb. Who says pulling a code doesn't tell you what part to replace 😆

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Jamey Owner/Technician
Ventura, California
Jamey
 

Yeah, we all had a good laugh at that when we got one too. I love the flow chart. get that code, have noise, replace engine!

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Richard Owner/Technician
Buffalo, New York
Richard
 

Our shop had a 2014 soul with a knock, 2.0 very expensive 3k at scrap yard with labor the repair was worth more than the car, customer ended selling to the scrap yard for $500 ,ouch

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Samuel Technician
Somers Point, New Jersey
Samuel
   

Hyundai/Kia have been replacing engines under warranty for years for the internal knock which in many cases ends in engine failure. As far back as 2011??? Most all customers received a recall that included oil sample testing and a dipstick mod. If the oil test or engine failed, internal pictures were sent in to justify the warranty. So many failures and replacements occurred. Many dealerships…

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Richard Owner/Technician
Buffalo, New York
Richard
   

car had a ten year 100k warranty we had the 2014 kia soul towed to dealer for warranty. They declined warranty because owner was not the original owner, car had 98 k on it.

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Ted Technician
Berwick, Nova Scotia
Ted
 

That sounds a little off, I’m betting that there’s much more to the story than the customer told you.

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Richard Owner/Technician
Buffalo, New York
Richard
 

Is the warranty on a Kia transferable? In addition, Kia's original manufacturer's warranty is only transferable in a limited fashion. ... That means that if you are buying/bought a used Kia, you only have limited warranty coverage up to 5 years or 60,000 miles​.​May 20, 2019 just out of luck on this one,

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