Mack aset 427

[Vmac3]

Did you remove and inspect the engine ecu connectors as FJH mentioned?  

V

Edited September 7, 2022 by Vmac3

[Jlam]

On 9/6/2022 at 8:35 PM, Vmac3 said:

Did you remove and inspect the engine ecu connectors as FJH mentioned?  

V

I have not yet 

[Dirtymilkman]

I would bump your idle RPM's up first. 625 is to low. 

[Joey Mack]

650 is pretty good,,  right ? Dirty milkman.... I dont like 625...   I even bumped a couple E-7's too 700 just to smooth them out,  and oil pressure was a few pound's better...   jojo

[Jlam]

2 hours ago, Dirtymilkman said:

I would bump your idle RPM's up first. 625 is to low. 

How would I get it bumped up? 

[Vmac3]

8 hours ago, Jlam said:

How would I get it bumped up? 

First make sure the parking brakes are applied and the engine is idling at temperature. Cycle the cruise control On/Off switch 3 times, the engine rpm should go down to 550 rpm. With the Set/Resume switch (its a spring loaded switch), toggle the resume to increase the engine rpm. Once you have set it to the engine rpm you want, press the clutch in. It should stay at your desired rpm. If its an automated transmission, then you would need Tech Tool to set the rpm.

Hope this helps.

V

[Vmac3]

11 hours ago, Joey Mack said:

650 is pretty good,,  right ? Dirty milkman.... I dont like 625...   I even bumped a couple E-7's too 700 just to smooth them out,  and oil pressure was a few pound's better...   jojo

You would be correct Joey. Most of these were set to 650rpm from factory.

[Dirtymilkman]

13 hours ago, Joey Mack said:

650 is pretty good,,  right ? Dirty milkman.... I dont like 625...   I even bumped a couple E-7's too 700 just to smooth them out,  and oil pressure was a few pound's better...   jojo

650..... maybe a bit higher on the etech because of the rough idle. 

[Jlam]

On 9/9/2022 at 5:51 AM, Vmac3 said:

First make sure the parking brakes are applied and the engine is idling at temperature. Cycle the cruise control On/Off switch 3 times, the engine rpm should go down to 550 rpm. With the Set/Resume switch (its a spring loaded switch), toggle the resume to increase the engine rpm. Once you have set it to the engine rpm you want, press the clutch in. It should stay at your desired rpm. If its an automated transmission, then you would need Tech Tool to set the rpm.

Hope this helps.

V

Yeah mine probably needs a program I tried it & it didn’t work 

[fjh]

47 minutes ago, Jlam said:

Yeah mine probably needs a program I tried it & it didn’t work 

How is the oil pressure with your foot on the throttle held At 650? 

[Dirtymilkman]

50 rpms will bump your oil pressure to almost 30 I bet

[Joey Mack]

Hell, going from 625 - 650 will bump it up..  just sayin'...  jojo

[Onyx610]

On 9/10/2022 at 9:39 AM, Jlam said:

Yeah mine probably needs a program I tried it & it didn’t work 

It will do it, you need to do it fast and end with cruise crtl on. On, off, on, off, on. 

[Jlam]

Anybody know what this sounds is, does it any time acceleration with a load on? 

[Onyx610]

Boost leak? Hard to tell…Almost sounds like a metal on metal squeal sound. 

Edited September 13, 2022 by Onyx610

[Jlam]

45 minutes ago, Onyx610 said:

Boost leak? Hard to tell…Almost sounds like a metal on metal squeal sound. 

Not metal to metal but for sure a squeal that I can’t figure out where it’s coming from, for sure passenger side 

[Joey Mack]

Did you check the turbo for movement of the turbine?  Also, look at top right corner of the CAC..front side. See if there is oil or residue at the weld where the viens attach to the side tanks..  a pressure tester is a key tool for this..  a few guys here made thier own..  jojo

[Onyx610]

18 minutes ago, Jlam said:

Not metal to metal but for sure a squeal that I can’t figure out where it’s coming from, for sure passenger side 

Good chance you have a boost leak. Run the engine and spray soapy water at all connections. Quick and easy since you don’t have a pressure tester tool or one made up yet. 

[Onyx610]

And yes check the shaft for play. The turbine could be scraping the housing. It will expand at high speed. 

Edited September 13, 2022 by Onyx610

[Joey Mack]

does the squeal ring out as a steady squeal,  or is it more of a ,,,  Chirp,, chirp,,,  chirp? and speed up with RPM's?  if you dont have a stethoscope,  you can use a 2 foot longish peice of 3/8" hyd. brake tubing, to listen to the engine and its parts,  ie: alt./ air comp.   I have couple thoughts, but will wait for you to reply with new info... Jojo

[Jlam]

So we have a new issue now, using a gallon of coolant a week & also smelling it thru my vents when my air conditioning is on 

[Joey Mack]

Heater core . 

[Joey Mack]

Is it draining from the drain tray onto the ground? Or onto the floor? How about a pressure test of a full system and look for engine leaks. Park on a clean spot or through a sheet of cardboard under it if you need too..  Hell, there should be obvious signs of a leak, at that rate.disregard the heater core idea for now..

[Jlam]

3 hours ago, Joey Mack said:

Is it draining from the drain tray onto the ground? Or onto the floor? How about a pressure test of a full system and look for engine leaks. Park on a clean spot or through a sheet of cardboard under it if you need too..  Hell, there should be obvious signs of a leak, at that rate.disregard the heater core idea for now..

I can’t find a leak anywhere, even parking on clean area. But gonna pressure test this weekend cause it’s way too weird lol 

[Joey Mack]

what color is the exhaust?