Noisey I.C.E. on initial start

[Maui]

So, I traded my '23 XLT Hybrid for a new '26 XL Hybrid AWD. (The reasons are a story for another day.) The '23 was very quiet always. When the gas engine started, the rpm was up, and stayed up for some seconds. You could hear the rpm come down, and a different "tone" began, I believe due to an egr opening or something. (not pretending I know this for a fact, but it is my best guess.

The new unit is similar, but when in the initial higher rev mode, it sounds like a cement mixer. Very loud and the sound has turned more than a few heads. Another description, if there were belt driven components, it sounds like a bad idler pulley, or bad water pump. (I'm old) A call to the dealer service guy told me it is the fuel injection making the racket. Why? It goes away when the rpms settle and the engine harmonics change.

Any thoughts?

Sponsored

 

[jonshep]

I wanted to tell you to check your engine oil, but I am clueless on your noise. Repost if you find what's causing it.

 

[HeyBales]

Your Generator Motor (47) is whirring at that point at a specific ratio RPM to offset torque from the ICE.
While it doesn't sit as high up as the Traction Motor (42, which isn't turning if sitting), its still not at the bottom of the tranny.

Could be your tranny fluid is low like several early posts on this truck found.
Enough posts at my first early oil change I checked - I was fine.

Could be the damper (edge of housing next to 1), but usually when owners reported noises with that a warmup didn't really help much, or maybe it got worse so warmup didn't matter.

Fuel injectors?
Service writer thinking of DFI of the EB 2.0L.
Doesn't apply. What you heard on 23MY should.


Oh, the ICE sound difference is when the catalytic has reached 1000 F, and it starts being used for torque. Prior to that it's at whatever idle speed the system wants and GM spins to cancel it out, you are actually using the EV system for power if you start moving. Well, I mean unless you just start it, go to Drive, and then floor it.
So indeed it's out of Open Loop mode at that point of the sound change, so call it your 40-45 sec warmup with no ICE load basically.

 

[Waterick]

IIRC, some of the earlier problems with a few of the hybrids being excessively noisy when cold were solved by the dealer reflashing the appropriate software.

 

[Darnon]

IIRC, some of the earlier problems with a few of the hybrids being excessively noisy when cold were solved by the dealer reflashing the appropriate software.

That wasn't so much noise as running excessively rich to the point the catalytic converters would run hot enough to glow.

 

[Maui]

My thanks to HeyBales for the detailed outline of how it works (and apologies for the delayed response). I mentioned the noise to the dealer as noted in my opening statement, but he phone diagnosed it as injectors. I have an appointment next week for an add on wireless keyless entry pad problem I have. I will leave it over night, with the hope the advisor and tech will listen for it together. (but given my long past Lincoln Mercury Service Advisor experience, that probably will not happen).

Sponsored