Hey guys ,
I'm new to the forum ,
I just bought a 07/08 G35s two weeks ago i bought it with a bad Maf sensor but i didn't have time to change it , i'm planing to change it next week ,
the first thing i did to the car is changing the oil and oil filter (5w30) Castrol Edge , i have a heavy foot ,i disconnected both MAF sensors and the engine was still running .
i started to hear a slight rattle or knocking noise from the passenger side from the engine a week ago is that caused from the bad MAF sensors or it's a mechanical issue ?
Also my Air filters needs to be replaced they are really old , i'm scared that my engine is going bad so any feedback would be helpful
here is a video explains the noise
Many Thanks

 

Sounds like you bought a lemon that someone filled with snake oil to keep the lifter tick or rod knock quiet enough so they could sell it.

Also, your lead foot + bad MAF sensors is going to quickly destroy that motor...

 

I'm changing the MAF sensors this saturday and the video is uploading now i ll post it asap .

 

and btw i just changed the oil from Castrol 5w30 to liqui moly 20w50 since i'm living in a hot area (Libya exactly ) i think it makes less noise now .

 

Using the wrong viscosity oil like that I'm not surprised you have noise coming from the engine, this isn't a diesel, ambient temperature doesn't affect operating temperature or operating fluid viscosity it only puts more strain on the cooling system, engineering tolerances determine total viscosity for the engine, ambient temperature determines which WINTER rating of oil to use.

Unless you have engine tolerances built for 20w-50 but that doesn't sound like the case, this is NOT a track car correct?

EDIT: If not a track car then switch back to 10w-30 for hot environments.

 

This car is bone stock nothing is done to it , so u think the noise is normal ?

 

It's really hard to tell from a cell phone recording but I don't hear any unusual noise, you will hear SOME lifter noise on any engine, it's the nature of the beast, the BAD sounds are usually a very distinct TICKING sound from only a couple valves. Rod knock is another sound that is bad but I don't hear anything like that in the video.

Here is a great example of valve tick

Here's a great example of rod knock

 

Keep in mind those are both DE motors and not an HR like you have but the valve tick and rod knock sound the same on practically ANY motor.

 

I think im going to change the air filters and the maf sensors and see if there is any improvements , Thanks

 

oof.. That rod knock video gives me the *******. I never want to hear that sound!

 

Lol yeah that's BAD rod knock, it's so loud when he starts that engine...

 

Lawd that knock brings back memories bad memories lol