Hey guys. I own a 2009 tsx that 3 weeks ago started with the sensor knocking. I of course did my research and found the TSB 09-041 that refers to it, so I went and replaced the knocking sensor myself with a genuine one, and also replace the manifold gasket,, and paid $45 to the dealer for a software update. The sensor still knocks. I do maintenance on my car and I have cleaned the throttle body, changed spark plugs, cleaned the MAF, replaced oil and transmission fluid. The knocking happens mostly when it's in idle, and sometimes when I accelerate, but it usually goes away when running, whenever there is a stop, it starts knocking. So I'm thinking about using seafoam, and then use a solution to clean the injectors which I hardly believe there is something wrong with them because I always use 91 octane.

The dealer is a dck and wants $165 to diagnose only, I sometimes believe that they didn't update sht and just straight lied to me hoping that I will be back. Idk I'll probably have to pay that $165 or take it to a mechanic that works with acura cars. Anyone had this problem? How did you solve it? Any kind of help is welcome.

I heard that kocking has to do with the timing but is there any way to reset this? I own a foxwell nt510 that I used once to reset the throttle sensor after cleaning it and also the ECU. Thanks.

 

There is a knock sensor that does not knock but detects knock. Suggest stating your problem clearly and add code from scanner.

good luck

 

You're right, it's a pinging noise that comes and goes, it sounds like if it was from the Piston but sounds different, and I thought the knock sensor was the problem and was faulty, the one that sits under the manifold, so I replaced it but still have the same problem.

​​​​​​​Which one is the one that knocks?

 

Valve train can make a tapping noise but typically will go away on warm engine.

Leaking exhaust can cause a knock sound. Loose exhaust heat shields might also cause a knocking sound. Serpentine belt tensioner can produce a knock sound on a very loose belt.

Knock sensor detects knock and PCM adjusts engine ignition timing to stop pinging. There is a code P0325 for knock sensor circuit fault but no code for knock detected that I could find. If car is really pinging/knocking then something is wrong and professional help is needed.

good luck

 

TexasHonda is on the correct path.
you'll need to figure out where the knocking is coming from...
if knocking from the bottom end of engine in terms of pinging...that's bad.
if tapping is from any other source, it's a bit better diagnosis, as those can be fixed.

the knock sensor doesnt actually knock. it detects knock/ping then asks the ECU to scale down timing.

 

who's there?









dad jokes aside,

maybe a valve adjustment can fix the issue

 

Thanks for the extra info, I'll take it to the mechanic this weekend and I'll let you guys know what is the problem, it's beyond my knowledge and I don't have much time right now to be checking my car everyday. I hope it isn't something really bad.

 

Sounds like it's a knock on top of the engine, whenever I put my hand there I can feel the knocking, it comes and goes, I'll try to upload a video.

 

ok I just uploaded a video of the sound, let me know what you guys think it is.

 

Sounds like a serpentine belt or timing belt driven component. Noise frequency similar to engine speed.

Suggest removing serpentine belt, start engine, and determine if noise present. If not, then inspect tensioner, alternator, idler, PS pump for fault.

If noise remains w/ serpentine belt removed, then timing belt system component would be likely.

good luck

 

OK sounds good, thanks for all the info. I will check on those ones or either take it to a mechanic, I'll keep you update as a reference if someone has this problem in the future.

 

I should have said timing chain instead of belt, however it doesn't change any other statements.

good luck

 

Ok so I took it to a mechanic and he said the idler puller assembly and the tensioner pulley assembly needs to be replaced and that's where the sound comes from because they are loose/defective. The parts itself are like $600 (from the dealer, I called myself) and labor is cheap, so tomorrow he will be fixing it, I hope that really fixes it and I can finally forget that annoying sound.

 

My last update, the problem is gone. That was the problem, idler pulley assembly and tensioner assembly were replaced, now the noise is gone! It feels like new again, no noise, it so quiet and smooth.