Vacuum Pump Replacement/Diagnosis

[Paintor]

On 4/17/2019 at 10:23 AM, flyingfool said:

why do we need a vacuum pump ?

 

Your engine creates NO vacuum when it shuts down 4 cylinders valves in V4 mode and bad things start happening to the PCV valve system and vacuum system. 4 cylinders with closed valves compressing air with nowhere to go except the PCV valve system into the intake...loss of vacuum....yum yum...engine starts eating oil sucked up thru valve cover breather pipes to intake.

 

Corvettes run ELECTRIC vacuum pumps. That’s for smart people.

 

Smarter people disable V4 mode and run a conventional vacuum line...delete vacuum pump. $20.

Edited April 30, 2019 by Paintor

[ksiesel]

4 hours ago, Paintor said:

Smarter people disable V4 mode and run a conventional vacuum line...delete vacuum pump. $20.

I’m intrigued by this idea.  Do you have some references or a how to where others have actually done this on a K2?

 

I can find post a about disabling AFM all day long, but I’m coming up empty looking for replacement of the vacuum pump by disabling AFM and running a traditional vacuum line.

[Paintor]

On 4/30/2019 at 7:28 AM, ksiesel said:

I’m intrigued by this idea.  Do you have some references or a how to where others have actually done this on a K2?

 

I can find post a about disabling AFM all day long, but I’m coming up empty looking for replacement of the vacuum pump by disabling AFM and running a traditional vacuum line.

You need to find out for yourself WHY these engines need mechanical vacuum pumps now.

 

Old big block muscle cars with crazy high lifts cams used to need vacuum bottles for the power brakes to store vacuum since they produced so little.....why do you need a mechanical vacuum pump?

 

Why does it share oil with the motor and grenade right after warranty and take your long block out?

[ksiesel]

4 hours ago, Paintor said:

You need to find out for yourself WHY these engines need mechanical vacuum pumps now.

 

Old big block muscle cars with crazy high lifts cams used to need vacuum bottles for the power brakes to store vacuum since they produced so little.....why do you need a mechanical vacuum pump?

 

Why does it share oil with the motor and grenade right after warranty and take your long block out?

 

Is there an answer to the questions that I posed somewhere in this response that I’m just missing?

[HondaHawkGT]

On 1/13/2019 at 9:20 AM, silveradosid said:

replaced mine yesterday for anyone that wants to do it them selves sambone95 did a good write up in the how to section , i disassembled the old pump and it is easy to see why these things are failing this is the cheapest and worst design of a pump that i have ever seen. i will try and post some pic's later

I checked out the vacuum pumps Ford and VW use. The internal parts look nearly identical to this. Same plastic parts and principle design. The only difference is that they bolt to the head and it's driven by one of the camshafts. Still lubricated by engine oil. On the F-150's it's mounted on the backside of the head and makes it a bit of a PITA to reach. 

[silveradosid]

is that on the 5 .0 or just the ecoboost engines

[ct_corey]

heres a weird one. I was searching for videos on google and it came up with this thread. My new body 19 makes the EXACT same noise, but the new custom Silverado has almost the same engine minus the vacuum pump. Vacuum is now electronic but the truck still makes the noise. Truck only has 1000 miles. GM  wants to see more break in miles before the start investigating. Dealer strongly feels is not an internal problem. Mine only does it on cold start and after the RPMS drop down from warming up. 

 

 

[HondaHawkGT]

7 hours ago, silveradosid said:

is that on the 5 .0 or just the ecoboost engines

As far as I know, it's just required on the Ecoboost engines.

[HondaHawkGT]

5 hours ago, ct_corey said:

heres a weird one. I was searching for videos on google and it came up with this thread. My new body 19 makes the EXACT same noise, but the new custom Silverado has almost the same engine minus the vacuum pump. Vacuum is now electronic but the truck still makes the noise. Truck only has 1000 miles. GM  wants to see more break in miles before the start investigating. Dealer strongly feels is not an internal problem. Mine only does it on cold start and after the RPMS drop down from warming up. 

 

 

The 2019 trucks don't use vacuum of any kind. The brake system on those trucks use a totally new brake system.

https://www.zf.com/products/en/cars/products_31680.html

[ct_corey]

20 hours ago, HondaHawkGT said:

The 2019 trucks don't use vacuum of any kind. The brake system on those trucks use a totally new brake system.

https://www.zf.com/products/en/cars/products_31680.html

I know the vacuum set up in different but the noise is spot on to what the OP posted 

[2018GMC]

Anyone know how to tell if you have updated pump? Wondering if my 2018 has the updated design? Build 12/2017

Edited July 13, 2019 by 2018GMC

[2018GMC]

Answering my own question. 

 

If your vacuum pump has a black cover and is not one piece cast, you have the new updated pump. 

 

Im took a pic of the back of my 2018 pump. Part number 12669488

 

https://www.amazon.com/ACDelco-12669488-Original-Equipment-Vacuum/dp/B01E6FWW1Y#customerReviews

 

 

[Sierra Dan]

Made in China.....     

That explains it all!

 

[bagger97]

Had my vacuum pump replaced yesterday, 42k miles. Much quieter pump. Took them 45 minutes from lift to finish.