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2014 MDX Engine Knock

 
Old 02-25-2019, 02:23 PM
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2014 MDX Engine Knock

Hello everyone I wanted to throw this out here for discussion.I have a 2014 Mdx tech awd with 38,000 miles that I bought new.I really like the car and the way it drives.It has good power and I have no complaints.The other day I noticed a pretty loud knocking sound in the engine when in gear and warmed up between 500-1200 rpm.It doesn't do it when cold or in neutral.It was very noticable to me and I was concerned. It went away at normal speeds,or I just couldn't hear it.Took it in to see what it was and the tech said,after comparing it with another MDX and checking a few things that it was normal.I just wanted to see if anyone had heard the same knock in their car and what they did.
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Old 02-25-2019, 02:37 PM
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Knocking or ticking?
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Old 02-25-2019, 03:37 PM
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Originally Posted by neoshi View Post
Knocking or ticking?
Definitely a knock!Louder than valves ticking!
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Old 02-25-2019, 04:25 PM
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You have to put your foot on the brake while revving up a warm engine in drive or reverse to hear it!Or use emergency brake.Its a rod knocking like sound!
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Old 02-25-2019, 04:50 PM
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Oh.. check your engine mounts then.
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Old 02-25-2019, 05:25 PM
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Tech said they were good!
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Old 02-25-2019, 05:35 PM
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Then you may want to check the suspension like control arms, cv joints, ball joints, etc for loose/worn components. Or even have an indie shop check it out because EVERYTHING IS NORMAL at Acura dealers 99% of the time...
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Old 02-25-2019, 05:58 PM
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Yep!Thanks!
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Old 02-25-2019, 06:28 PM
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Neoshi,would you check your mdx for this noise and reply back?Thanks!
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Old 02-25-2019, 06:38 PM
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Are you aure you have the right grade oil?
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Old 02-25-2019, 08:19 PM
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I'm using 5w20.Shouldn't make a difference should it?Seems like it used a little with the 0w20!
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Old 02-25-2019, 08:26 PM
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That could be your problem.
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Old 02-25-2019, 08:47 PM
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It's possible !
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Old 02-25-2019, 09:01 PM
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If you could record your sound i can compare but just a description alone is too hard to say yes i have it. I've used both 5w20 and 0w20 and now 5w30 so it didn't be a difference really. If you've run low and your bearings are shot that would be another story but that tech said it was "normal" so i don't think it was bearings
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Old 02-25-2019, 09:57 PM
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Might try to record it.
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Old 02-25-2019, 10:19 PM
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I was driving the car up on ramps slowly for a oil change with my foot on the brakes and head out the window or I might not have heard it!
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Old 02-25-2019, 11:49 PM
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OP, does it sound like some pebbles rattling in a metal can ?
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Old 02-26-2019, 08:22 AM
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No,it's more of a knock than a rattle .
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Old 02-26-2019, 09:57 AM
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Engine knock is generally one of only a couple of things. Piston slap of bad bearings.. bad bearings could be caused by any number of things including wrong grwde of oil. Piston slap is a sign of worn rings or very heavy block wear.
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Old 02-27-2019, 06:40 AM
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I tried to upload a video of the noise but could not.Anyone have suggestions on how to do it?
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Old 02-27-2019, 09:41 AM
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Using regular rather than premium octane gas?
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Old 02-27-2019, 09:54 PM
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No I use premium or mid grade mixed with it!
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Old 02-28-2019, 07:04 AM
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Originally Posted by Donn0128 View Post
Engine knock is generally one of only a couple of things. Piston slap of bad bearings.. bad bearings could be caused by any number of things including wrong grwde of oil. Piston slap is a sign of worn rings or very heavy block wear.
This sound is heard in gear only!Do you hear these in neutral?
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Old 03-01-2019, 08:33 PM
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Based on the rpm and the warm engine condition, I would suspect the VCM system kicking in. Mine gets obnoxious at lower speeds after warm-up. It is worse if you have loose or missing clips on the plastic shroud over the radiator.
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