4.6 engine knock, knocking

[KWray]

2011 4.6 - Went out this morning (Mon) after the car sat in the cold over the weekend. Started the car at about 38 degrees, had immediate loud tapping/knocking sound and CEL came on. I let it idle for a min while I popped the hood to listen to where it was coming from. It seems to be in the driver side top end around the center of the head. I turned it on and off a couple times, as it warmed up. The CEL went back off, it lessened a little but never went away, so I shut it down and didn’t drive it. I am going to read it when I get home from work to see if it stored the code. Any advice before I consult a mechanic.

 

[gpjlytham]

now is the time to try some magic snake oil. Bars Leaks Engine repair appears to have the best promise. If your engine has seriously damaged components you might need 2 bottles (see label on bottle for exact instructions). I just put 2 bottles in V12 jag and it is running cooler, but that could be a coincidence.

 

[Spanky61]

Sounds like a stuck valve possibly. If it's stuck the tappet would make a knock. Knocking from a cylinder, connecting rod or piston slap, is a different knock from a lower part of the motor. Think small problems first.

How many miles total? Are you still on warranty? Did the engine diesel (run on) upon shutdown?

What weight oil are you running?

Don't put anything foreign in the motor, run a compression check first. This will immediately tell you if there is a major problem right off. If all the cylinders are near the same readings, it's not a bearing or connecting rod problem.

 

[KWray]

Update - After posting this I completed additional research and spoke to a couple mechanic friends regarding comments made about OEM oil filters. Some vehicles for various design reasons have requirements to use the OEM filters. To make a long story short, I completed a list of things to try from replace the oil filter (simplest) to tearing into the engine (most expensive). I went to the dealer and bought a new filter, which was only a little under $12, replaced it, and carefully inspected the one I removed for any fragments. The oil and filter were clean. I replaced the little bit of oil I lost in the filter swap, started the car, and no more issue.
If you have someone besides the dealer do your oil changes, go buy the Hyundai filters. Do NOT use after market filters. Apparently there is a precise flow rate on the filter and if that is off there are issues with getting enough oil where it needs to be. Fortunately for me, I only used the after market filter once and caught the issue within a thousand mile so no damage was done.

 

[KWray]

Sounds like a stuck valve possibly. If it's stuck the tappet would make a knock. Knocking from a cylinder, connecting rod or piston slap, is a different knock from a lower part of the motor. Think small problems first.

How many miles total? Are you still on warranty? Did the engine diesel (run on) upon shutdown?

What weight oil are you running?

Don't put anything foreign in the motor, run a compression check first. This will immediately tell you if there is a major problem right off. If all the cylinders are near the same readings, it's not a bearing or connecting rod problem.

Thanks for the reply Spanky61!

 

[Spanky61]

They're excellent filters and work well. They are specifically designed for the Genesis. We use Hyundai Filters as well in the Kona. Heavy casting, coil spring bypass valve, additive cartridge, viton o-ring and even stamped with the Hyundai "H" inside the top of the additive cartridge.

Happy to hear it wasn't anything major! Another reason to stick with what it was made for.

You're welcome.

 

[Kgyudaman]

Interesting post. I sometimes get engine noise when I first start the car, but it goes right away. As I think back I believe it started when I changed where I get the oil changed. I will have to make sure that they only use the OEM filter.

 

[toxicavenger70]

Some filters don't have a drain back valve. And that can cause an issue like you mentioned. Glad it was something simple.

Good job.

 

[KWray]

Some filters don't have a drain back valve. And that can cause an issue like you mentioned. Glad it was something simple.

Good job.

Thanks. Because I had seen that in Honda’s and other cars, I thought the same thing. But in this case I think the deal with the filters is more about the flow rate. When you look at the filter and the way it seats in place, there is no valve or flap to prevent drain back present.