Loud ticking from engine
 

Hello,

2013 MT with 70k miles, started getting a very loud ticking sound that increases in rate with RPM. It doesn't sound violent like rod knock , and it is present at any RPM above 950, cold or hot. The rate of the ticking gets faster with more RPMs; by 4000 rpm its so fast it sounds like buzzing. Sounds like its only coming from the passenger side/right side head.

Car is turbocharged with a 50-trim, was running very low boost (8 psi) when it started happening. I was getting onto the freeway, and when boost was coming on around 4.2k rpm the car jolted as if i hit the rev limiter. A few miles later the ticking sound started. Oil level has been fine, and this happened 3 miles after I had done an oil change. AFR is fine, builds boost a little bit slower, and no codes are present.

My question is, does this sound like a bent rocker arm? Stuck valve? Broken valve spring? Any help is appreciated.

https://youtu.be/yDFU5XgZ8L8

https://youtu.be/1m_U4BdeYJ4

https://youtu.be/VdItkY7hwrU

https://youtu.be/9XlV2hF7PcQ

The 2nd YouTube video sounded like my FRS before it died due a VVT issue. http://www.ft86club.com/forums/showthread.php?t=125879

Hello Noroto and welcome to our fine forum ....... :)

Oh, my ......that don't sound good ..... has the car given you any codes .....??

Back in the day ...... I would have called that a stuck lifter or a valve out of adjustment.

However, today, with this engine, I would have to guess that it's a rod knocking ...... sorry.


humfrz

No codes ever showed up.

Hopefully, some other folks will chime in.

I listened to your 2nd u-tube posting and it still sounds like a rod knocking to me.

(I hope I'm wrong)


humfrz

Pre 15' are known to potentially develop rocker arm issues. Valve cover is going to have to come off from the sounds of it.

That 2nd video sounds like a rod knock :(

Just wanted to give an update;

I pulled the engine out and took it apart, it has a badly bent rod. Bearings are okay. Haven't taken the shortblock completely apart yet so I'm not sure if the cylinder wall is okay.

Too-small of a turbo gives too much torque at low RPMs which the stock rods can't handle and end up bending. I had a small 50-trim, even though it was low boost it came on too quick. I remember now that when it happened, I was getting on the gas in third at low RPMs, should have downshifted :bonk:

Thanks to everyone that chimed in.

Unfortunately, my engine blew late jan. It had an identical sound. The rod snapped and put a 2 inch x 12 long hole in the block. My rod snapped when I was leaving a parking lot so I think boost kicked it and the rod finally snapped