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09-15-2021, 05:02 AM | #1 |
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Cold start knock
So this summer my car started making a really strange knocking sound at start-up/cold start. It sounds like a knock however it only happens for half a second then goes away and the engine sounds absolutely normal. The sound is present ONLY if the car has been sitting for at least a day, so I am guessing it has something to do with the oil.
The car runs fine otherwise, no smoke coming out the exhaust and no other strange sounds coming from the engine. Also there's no mods done to the engine other than a K&N air filter. I ran the car during winter and it didn't make this sound, so i doubt it's due to temperatures. The car has received regular oil changes at around 3500 miles. It has been running Motul 300V 5w40 for 40.000 miles. Here's a link to how it sounds from inside the cabin: |
09-15-2021, 10:48 AM | #2 | |
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09-15-2021, 12:59 PM | #3 |
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09-15-2021, 01:06 PM | #4 | |
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Could be your valve lifters. How about your oil filter, is it OEM spec or something else? |
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09-15-2021, 01:17 PM | #5 | |
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And no the car does not get beat on that much, it has only seen a track day so far this year. Oil filter is an aftermarket Mann oil filter, the skinnier, elongated type. |
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09-15-2021, 01:31 PM | #6 | |
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09-15-2021, 01:34 PM | #7 |
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Here is a quick writeup about the negative with oil overfill.
https://www.cars.com/articles/what-h...th-oil-433476/ |
09-15-2021, 01:51 PM | #8 |
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Maybe your oil is too thick?
Toyobaru says to use 0-20. |
09-15-2021, 02:14 PM | #9 |
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09-15-2021, 02:15 PM | #10 | |
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The Following User Says Thank You to Sniepster For This Useful Post: | humfrz (09-15-2021) |
09-15-2021, 03:08 PM | #11 |
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Yeah I'd report back when you change the oil to a lower grade. The sound is certainly not pleasant, and nor is it doing any good to your internals, if anything it is speeding up wear, so you don't want to prolong that too much.
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09-15-2021, 03:16 PM | #12 |
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09-15-2021, 04:42 PM | #13 |
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It's early rod knock. Takes a couple seconds for the oil to pump up and hit the bearings from a cold start. Relying on thin film lubrication until then, and it's when worn journals will be most obvious.
Sorry. Sucks.
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09-15-2021, 08:21 PM | #14 |
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Probably off base, but I had a bad harmonic balancer on my pickup's straight 6 make a similar sound. Wouldn't hurt to check.
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The Following User Says Thank You to blsfrs For This Useful Post: | Ultramaroon (09-15-2021) |
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