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molassascookieman · 03-07-2019, 06:35 PM

Story time. I have a 13 FR-S with 140,000 on the engine to date. About a month and a half ago, I raced a Jaguar at around 120 for a good 3 solid hours down I-10, and when I finally slowed down, I heard a weird, throaty rattle coming from the engine. At first I thought it was related to the clutch, as it stopped when I was in neutral with my foot off the clutch. I then took my car into Toyota to have the valve-spring recall done, and got a call saying my engine has a rod knock, it has nothing to do with the clutch, and my engine needs replacing.

Now I trust this dealership, and have no reason to believe they are trying to hustle me (they know full well I know a lot more about cars than the average person, and have even told me to go away and do it myself when I brought it in for some other stuff). BUT, I am skeptical of their diagnosis, because I have heard many rod knocks before, even from other BRZs, and this sounds way less violent, is coming from the bottom of the engine not the top, and because the sound gets louder when I accelerate. I can't really get a good audio clip or video clip because the short shifter starts rattling whenever I'm going fast enough to hear it.

The sound is a deeper rattle, almost sounds like somebody gargling water, but more mechanical. It has gotten somewhat worse since it started, and it does get slightly worse when the engine warms up, but everything else points to it not being a rod knock. Any idea what else this might be, and any fixes I could attempt?

03-07-2019, 06:35 PM	#1
molassascookieman Junior Member Join Date: Jan 2019 Drives: 2013 FR-S Manual (Stock for now) Location: San Antonio Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Possible rod knock Story time. I have a 13 FR-S with 140,000 on the engine to date. About a month and a half ago, I raced a Jaguar at around 120 for a good 3 solid hours down I-10, and when I finally slowed down, I heard a weird, throaty rattle coming from the engine. At first I thought it was related to the clutch, as it stopped when I was in neutral with my foot off the clutch. I then took my car into Toyota to have the valve-spring recall done, and got a call saying my engine has a rod knock, it has nothing to do with the clutch, and my engine needs replacing. Now I trust this dealership, and have no reason to believe they are trying to hustle me (they know full well I know a lot more about cars than the average person, and have even told me to go away and do it myself when I brought it in for some other stuff). BUT, I am skeptical of their diagnosis, because I have heard many rod knocks before, even from other BRZs, and this sounds way less violent, is coming from the bottom of the engine not the top, and because the sound gets louder when I accelerate. I can't really get a good audio clip or video clip because the short shifter starts rattling whenever I'm going fast enough to hear it. The sound is a deeper rattle, almost sounds like somebody gargling water, but more mechanical. It has gotten somewhat worse since it started, and it does get slightly worse when the engine warms up, but everything else points to it not being a rod knock. Any idea what else this might be, and any fixes I could attempt?