Normal Engine Noise? (Video)

[nickstl77]

Hey guys, just wanted to see if this type of engine noise is common for these trucks. It's a '14 Silverado with the 5.3. Best I can describe it is like a sort of mix between a tick and what almost sounds like an exhaust leak. Also a whirring sound that goes away after a few minutes which I've been told is the 2nd fuel pump.. I've heard that noise on several other Silverado videos so I'm guessing it is common and nothign to worry about. Exhaust you'll hear in the video is a Flowmaster Super 44 with resonator and flap valve removed, dumped at rear axle.

https://www.youtube.com/watch?v=4OFao-xXaok

[newdude]

Yes all normal.

 

 

Information For Why New Engine Technologies Are Generating Noises

 

 

The latest generation of full size trucks and utilities incorporate a new generation of technologies not previously seen in full size truck and utility applications. As a result these engines generate noises during cold start and during warm operation that owners of previous generation multiport fuel injection (MFI) vehicles may not be familiar with.

 

Direct Injection (DI) / High Pressure Fuel Pump / Fuel Injectors

 

 

The new Small Block Generation 5 engine family incorporates a new fuel system technology known as Direct Injection (DI). With DI, fuel is injected directly into the cylinder using a high pressure fuel system. DI provides many benefits in improving engine efficiency. In particular, DI improves power, torque, and most importantly fuel efficiency. This technology is included as standard equipment on all Generation 5 engines in the Small Block engine family which are the: 4.3L V6, 5.3L V8, and 6.2L V8.

 

The high pressure fuel system does have unique operating characteristics, in particular the noise emanating from the high pressure fuel pump can result in a subtle ticking noise that is apparent when the vehicle is idling. The sound is more evident when outside around the vehicle, when the hood is open or the vehicle is operated in a drive-through. The sound may be more noticeable during a cold start, but lessens once the engine is warm. A slightly higher pitched clicking sound is the fuel injectors pulsing ON and OFF under the high fuel pressures. These sounds are a normal characteristics of the DI high pressure fuel system.

 

Another operating characteristic is a slightly longer crank time when the engine is started. The increased crank time is the result of the time required to build high pressure in the fuel system before the engine starts.

 

Oil Pump Cold Start Rrrrp or Rasp

 

 

The oil pump design has changed from a gerotor gear type pump to a two speed vane type pump for fuel economy reasons. At temperatures of 32°F (0°C) or colder, when the engine has been sitting for a few hours it is possible to have air enter the pump through normal oil drainback. Upon startup the owner may hear a short Rrrrp or Rasp coming from the front of the engine. It is most often heard during a remote start. There is nothing wrong with the oil pump or oil system. No repairs should be attempted for this condition.

 

[BigBadSierra]

Yes it's all normal.. The DI engines as stated just tick but there is allot more pressure then the old style injection systems.

 

Then all of the other noises for the fuel pumps to the EVAP system and brake boost systems.

 

Then even when you shut the engine off the ticking/clicking when it shuts the fuel pumps down.

 

Chatty truck.

[jocassee]

I know this is a little off topic, but how much difference does it make to remove the resonator. I just installed the borla touring muffler and only removed the flap valve.