I drove fast my car today on the highway, at high RPM (about 5000, but never in the red zone) in hot weather (32 C / 90 F) for about 10 minutes. Nothing wrong with the engine temperature, but when I stopped while the engine was idling and still on I noticed it was quite noisier than usual. It sounded like a diesel engine (though it is a gasoline). It sounded also like a boiling water.

Questions:

1. Did I mess anything? Is it possible I did a permanent damage to the engine or anything else?
2. Is there anything I should check?
3. Is driving in hot weather bad for the oil? In other words if the ambient temperature is high does this shorten the oil life? Thanks a lot.

Here is a video. Notice after the 7th-8th second there is a hollow noise, tick-tack, tick-tack every second.

 

What car? Engine type? How many KM?

Healthy engines can run into the red zone under higher temperatures for longer than 10 minutes without any damage...

It's kind of hard to tell from the video, but do you notice a loss of power? Any misfires? Have you run any codes via the ODB2 port?

How is your oil level?

 

The car is 2009 Honda Accord, R20A3 engine, 115 KW (156 hp) and it has 80,000 km on it.
No loss of power, the oil level is just normal, I use Mobil1 ESP 5w30 fully synthetic, have recently changed it.
And the car never overheat.
However, I know how quiet and smooth the engine used to run and sound before today's event.
It is different now. And if I press the throttle the kak-kak-kak sound becomes more frequent as the rpms go up.

 

With the information given, it doesn't sound like the engine would have destroyed itself in such a short amount of time under that kind of load. Especially if oil levels are good.

If I were you, I would check to see if there's anything loose in the engine bay ... example being a heatshield, loose bracket, anything else.

Just my

 

Thanks for your prompt reply.

What you are saying makes sense - it could be a heatshield, loose bracket (I'll check these). However, why would the noice increase its beat when I press down the accelerator? Sounds more like an engine issue

 

 

That's a good question. As engine RPMs increase, each rotation of the crank gets faster and faster, and that has a direct effect of the amount of vibration coming from your engine. Sticking to my original comment, a loose heatshield / bracket / whatever could follow the engine speed if it's loose enough.

While it may be a bit of a long shot, I would try to feel anything out as being loose first as it's the easiest thing to check ... not to mention, the least expensive / time consuming

If you want some piece of mind, you can always pull spark plugs and perform a compression test on all 4 cylinders while the engine is warm. If you have consistent compression over all 4 cylinders, next would be pulling the intake manifold and checking your valve clearances.

As the intake / exhaust valves become out of spec, the valvetrain can get quite noisy .. in which case, a valve adjustment is needed.

I will say though, 4 cyl Accords (of almost any generation) are generally pretty damn reliable and maintenance free ... I would highly doubt an engine that young would need any kind of valve adjustments / substantial engine damage unless it was mis-shifted or poorly maintained.

Just a thought.

 

I've done worse than you in my car, on the track. Basically kept it above 4000 rpm for 20 minutes at a time, multiple sessions in a day. Hitting or staying near redline as much as possible.

 

Thank you, guys for your words of consolation.
Hopefully it won't be an engine issue. This morning I drove it again - and the same story - irregular knocking when the engine is idling. And it makes no difference if the engine is cold or warm. However, the good news is that it accelerates normally, no power loss, the oil is at the usual level, the coolant is ok, it doesn't overheat, etc. I checked for loose brackets and they seem fine.
By the way, the noise seems to be more intense on the right side - near the belts (on the left in the video).

 

Sounds like it may be a broken motor mount, a bad tensioner or bad pulley bearing.

Get a stethoscope to determine where the noise is loudest; that'll locate the problem for you.

 

Guys,

It turned out to be the Air condition compressor - it is gone. The problem had nothing to do with driving at high rpm or the heat or the engine.
The service guy said that japanese cars basically have weaker a/c compressors that work at maximum which shortens their life. European and newer cars, in contrast, do not work at max, he said they have some protection maintaining the temperature, thus they last longer.
Anyways, one question: Is it ok to temporary drive it that way?

 

Depends on what component of the AC compressor failed ... As long as the belt moves freely and/or the tensioner / bearing isn't totally compromised, I think it would be okay.

The sound in your video doesn't sound like a tensioner / bearing failed.

 

same thing happened to me with my old car. just got a new one.

 

OK, the AC issue has been fixed. It turned out to be a loose AC bearing and a magnet. The problem is solved, the noise has disappeared, the AC is working now.
However, I have a new problem - the engine shakes while idling. I don't have power lost or anything else. I watched the possible reasons and I strongly suppose the mechanic left something loose while putting back belt.
Am I right? What else might have caused that annoying engine shake?

 

Similar symptoms to my buddy's 2003 CRV - check the intake hose going to the throttlebody from the airbox. It may be loose or have a crack in it allowing in unmetered air.

Also, check for any disconnected / leaking vacuum lines to the Intake manifold.