Holy crap, why is the MES 40" gen 2.5 SOOO bad with temps?

  • Some of the links on this forum allow SMF, at no cost to you, to earn a small commission when you click through and make a purchase. Let me know if you have any questions about this.
SMF is reader-supported. When you buy through links on our site, we may earn an affiliate commission.

nickbuol

Newbie
Original poster
Jul 11, 2017
10
10
Just fired up my smoker for the 2nd time today since I bought it to make some pulled pork.  I saw the temp fluctuations with my first usage, but this is ridiculous.

I turned on the smoker an hour before I wanted to add the meat (three 7-8 pound pork butts).  During this warm-up time, I also put the water pan in with a nice amount of the apple cider "brine" that the pork butts sat in overnight so that it could warm up too.

Then the pork butts sat out for that hour, while I finished applying a bit of rub to them, and so they weren't 38F when going into the smoker and kicking the temp swing cycle like last time.

Well, now I am seeing something completely different.

I have had it set at 225F since the start, and 3 hours after starting it up (2 hours after the meat went in), it is temp spiked 298F!!!  What the heck?  I excepted a little dip and spike as the cooler meat went in, but almost 300F?!!?!

Below is a picture from my phone a few minutes later after I opened the top vent a little more (letting some heat out, but also some of my smoke). 

The internal temperature of the meat is going to be hit a lot sooner than the 8 hours I want this pork in the smoker for...  I guess at this point, it is probably close to being done with the smoke phase anyway, so the more open top vent is how I will have to regulate the temp down, but I would have thought that when the internal sensor hit 215F it would coast a little to maybe 250F and go back down.  Just really surprised by almost 300F.
 
And just 20 minutes later, it us under my set temp and still falling....  Ugh.  With my piece of crap Brinkman Smoke N Grill that I upgraded from, I "modded" the crap out of it just so that I could get temps above 225F.  It was all sort of hassle to work with, which was the primary reason that I wanted to go electric.  The larger capacity of the MES40 was just a bonus.

I just hope that I don't ruin 3 pork butts today.

 
I just got a Gen1 MES30. Its temperature swings are much smaller than yours, sorry yours is acting so strangely. After mine settled in, with a 275F setpoint, and the unit empty (including no water in the pan), I saw it range between 276 and 290.

What does the smoker report for temperatures during these swings? And how close is its sensor to the meat, for instance?

If you put something cold right next to the smoker's temperature sensor, you're going to mislead its sensor, and it will react accordingly, since it thinks it's colder in there than it really is. So it will crank up the heater. If set to 225F, and you're measuring 300F, but it's reporting 220F, then that's important to know. If you're measuring 300, and it's also reporting 300, then that's different, and maybe something is wrong with it.

Also, I'm new at this, but I've seen people suggest leaving the top vent open fully while smoking, to keep the smoke from getting stale/bitter, etc. Apparently you want fresh smoke moving through it, rather than the same "old" smoke stagnating in the unit.
 
Last edited:
Yeah, after last weekend's swings, I was very careful about meat placement this time in regards to the sensor and such...

Here is the kicker.  After the massive swing that I posted above, the thing settled down for about 4 hours, and was showing temps within a couple degrees of the 215F that it was set at.  That is until about 10 minutes ago.  It is up to 246F and climbing.  I haven't touched anything with the unit.  No settings have changed, no doors have been opened, no wood added for a couple of hours.  It has been an overcast day all day too, so no direct sunlight any of this time.  The outdoor temp has only gone up about 10F since I turned the smoker on this morning some 8+ hours ago.

So at least for a solid half of the smoking time (per the recipe) it was almost spot on.  No idea why the other half of the time the thing freaks out. LOL

EDIT:  I am also starting to realize that this is going to take longer than the "8 hours" that the recipe states.  The internal meat temp seems to be going up at about 10F per hour.  I've got about 35F - 40F more to go and it has been almost 8 hours already.  I guess I should have gotten up extra early on a Saturday morning (or not stayed up until 2am last night).  
 
Last edited:
 
Here is the kicker.  After the massive swing that I posted above, the thing settled down for about 4 hours, and was showing temps within a couple degrees of the 215F that it was set at.  That is until about 10 minutes ago.  It is up to 246F and climbing.  I haven't touched anything with the unit.
So, when the temperature spiked again, what was the smoker's display showing? Did it acknowledge that it was way over-temperature? If it still displayed 224F (or whatever), but had actually risen 20+ degrees, maybe it's not sensing correctly for some reason.

I've only used mine twice. But last weekend, when I'd check it, it was usually displaying something within a degree or two of setpoint. And my separate thermometer probe would usually show it being within 10F of setpoint. I tried to put my probe near the smoker's probe, so that they're reading similar air.

Bear, thank you for the setpoint suggestions. That was an interesting read, for how to get it to settle in more quickly!
 
Good question on what the display was showing.  I was monitoring pretty much exclusively from the phone app.  

I'll get it figured out yet, but I never imaged this much tinkering around.

Bear, I will have to try that next time.  

For now, I am going to have just mediocre pulled pork it seems.  I had never smoked pork butt before, and the recipe I used said "8 hours" so that is what I planned.  Well, about 9 hours in, I saw rain clouds coming.  No easy way to cover the smoker and we were going to be leaving mid-way through the coming rain to go somewhere, so I couldn't relocate to the garage and leave the door open.  So into the oven went the meat.  It hit its temp about another hour after we got back, and I just pulled it from the oven.  I had transferred the water pan from the smoker into the oven, and put the pork onto another pan that has some apple cider in it as well.  It ended up coming out fairly dry...  Good bark on it, but seems dry right now.  I am letting it rest a little before pulling it, so we shall see...

We like barbecue sauce, so I think that we will be OK in the long run.
 
Well, after letting the meat rest for a little bit (longer than 30 minutes, less than 45), part of it just shredded easily, but a majority of it took a little more work to pull apart.  The flavor was good, and after resting, it was juicier on the inside than I thought.  Very tasty.  Just not enough to pull apart everything easily.

So next time I will try the method that Bear mentioned for temperature control.  It just was so odd that things changed so much in how the smoker was changing the temperature at such varying times during the process.   I would have thought that it would have been somewhat consistent in how it functioned anyway.  If it did that, then you could more easily find a pattern and a solution.  This somewhat randomness is harder to respond to.  I still can't believe that a $350+ smoker isn't more consistent, but I'll get it figured out yet.  
 
 
Well, after letting the meat rest for a little bit (longer than 30 minutes, less than 45), part of it just shredded easily, but a majority of it took a little more work to pull apart.  The flavor was good, and after resting, it was juicier on the inside than I thought.  Very tasty.  Just not enough to pull apart everything easily.

So next time I will try the method that Bear mentioned for temperature control.  It just was so odd that things changed so much in how the smoker was changing the temperature at such varying times during the process.   I would have thought that it would have been somewhat consistent in how it functioned anyway.  If it did that, then you could more easily find a pattern and a solution.  This somewhat randomness is harder to respond to.  I still can't believe that a $350+ smoker isn't more consistent, but I'll get it figured out yet.  
My MES 40 Gen #2.5 holds a tight cycle in calm weather, with the top vent fully open.

If it's windy or breezy, I close the top vent half way---Never close it completely !!!

I checked my Kitchen oven one time while doing a Ham, and the temp cycled wider than my MES, and I had to adjust the oven setting 30° to get the actual "Maverick" Temp I wanted.

Here's a Step by Step on Pulled Boston Butt:

Pulled Boston Pork Butt         
Bear
 
  • Like
Reactions: nickbuol
SmokingMeatForums.com is reader supported and as an Amazon Associate, we may earn commissions from qualifying purchases.

Latest posts

Hot Threads

Clicky