737 Max 8 Engine(s) Won't Start in Cold Conditions (< approx 6C) Following Checklist

Fantastic info, thanks,

But unrelated to the issue, obviously.

Apparently

I’ve seen that warning too. Haven’t tried to figure out why. The whole AIRCON/pressurization system is still giving spurious errors too.

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Perhaps change the title to …Engine 2 won’t always start following checklist, starts intermittently, unclear cause." or something like that?

FWIW, I just loaded in again and ran through my usual start sequence and again no problem. In each case, “Motoring” started around 18.4%, continued through about 23%. I intentionally delayed introducing fuel until N1 maxed out, which was right at 25% in both cases.

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I’ve added in “Always” for clarity, I think the rest is in my first posts description.

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Interesting. You likely haven’t encountered the bugged state then. Are you following any particular startup flow like the official checklist or are you just starting it like you’d start any other 737. Prior to SU2 this 737 I would just go with what I usually do on other 737s and it started up every time for me. Now it doesn’t.

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I used a checklist a few years ago when I first got the PMDG 737 but since then I’ve basically gone to just using a flow. The Max - for me, today - started up both times pretty much how I’d expect the PMDG or iFly startups to go in FS2020.

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Thanks for checking it out. I’m in half a mind to delete the local 737 streamed folder and get a re-streamed fresh copy next.

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I’ve got a work around for myself. If the engine is not starting (because does not reach 25%, and even on 25% it does not start often) I open a weather window and momentarily uncheck the real weather box. The troubled engine starts immediately. After this I check the real weather box again.

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OK before any more people start to offer suggestions, please do your own testing before suggesting anything. There is clearly a bug causing issues with normal operating startup procedure.
On one computer I happens pretty much every time with my eng2, on my other computer it doesnt happen as often. There is so many things that are bad/wrong about the B738M and its clearly just poorly made, so Im just waiting for the devs to actually try using their own plane and fix these things as I am not paid to do so.

But please, stop suggesting things like packs off or god knows, which is the normal startup procedures. The ones of us that are doing the c&d startups of course knows about the normal way to start this aircraft.

I have tried troubleshooting this issue on my own, with pretty much every variable mentioned +more.

I have countless hours in the zibo, pmdg and now MSobo/WT B738M - which all worked to some extent up until Beta-SU1/2.
So something is either wrong/bugged or there are some corrupted files or whatever. The fact that it is also inconsistent is also worth noticing.

the fact that they still havent swapped the FO PFD and didnt fix the BBJ lighting until 4 months later means that I dont really expect them to flush out these issues in this year, maybe not even until FS28 going by their history.

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Yes, this is a bag definitely. However, as a work around can you just try my workaround descripted above (call the weather menu uncheck the Real weather box if the engine does not start) please. This may help to find the source of the bug. For me this works 100% of time.

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Good to know, but there is some underlying issues here someone needs to address. Even when I DO get it to start it sometimes bugs out the engine display showing just 0’s after the motoring, but then as I add fuel it shows back normal.

I also have issues with flightplanning and editing the Legs in the FMC all of the sudden, with it throwing weird messages and starts deleting itself at random.

Ive also had issues with being unable to swap com standby to active.

The FO PFD should be mirrored.

I suspect there are some wrong/missing textures in the overhead panel.

I know this is the bug topic for the engine issue, but someone really needs to take a closer look at this aircraft and what is going on.

Man I wish PMDG would just release their 737 for fs24 so I wouldnt have to deal with this.

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This workaround is not working for me. ENG2 still won’t start. Now using 1.4.9 patch. I’m going to try deleting my streamed aircraft folder for the 737 and re-create.

I tried deleting the StreamedPackages/fs24-Asobo-aircraft-b737max folder and let it recreate, and still no joy with ENG2. This is with latest version (1.4.9) of SU2 which has had some fixes (looks like generators may have been fixed so potentially fixing power outages during flight)

I did the same thing. The work around does not work. ENG2 still not powering up.

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Did you ever try this?

I am doing a bunch of load-in tests this morning to see if the long-loading bug is truly fixed (it’s not for me), but I’m still able to start both engines in live weather with my usual startup flows.

Yes but sadly it didn’t make a difference. I still can’t start ENG2. The bug seems to persist once you run into it, even after clearing the streamed folder. (I didn’t try deleting the rolling cache).
Flights are loading in faster for me after latest update, but I had a couple of long pauses (they type you get right before a CTD) but surprisingly the sim didn’t CTD and actually resumed after the pause. (On approach into Ini’s EGSS).

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Started engines today today 4 times perfectly - URMN, UUDD, ULLI, Denver . And one time in Surgut with a problem on the second engine (eng 2) solved by workaround (real weather OFF). I think this depends on a temperature (cold is not good) or a local pressure. May be I am wrong/

So if you turn real weather off, do you go through the startup procedure again? Ill maybe try that. In it’s stuck state the weather tighle does nothing for me.