UCON Flex Advanced Engine Management System

Yessir, sure do, i thought it might be related to that, but i've had the filter get wet before and throw water across the maf, and this was completely different. This was just the guardian kicking in, and complete loss of power. When the MAF would get water across it, the truck would kind of sputter

 

Any chance the engine was still cold? I know there is a setting that won't allow certain RPM's until it's up to temperature. Just guessing at things....

 

I was thinking about this too. I didnt notice the temp, but i drove it about 3-4 miles in the city to get to where i was washing it, couldnt have taken more than 10 minutes at the wash, but maybe it cooled down some? It was right after i pulled out of the wash, just wanted to go wot to get most of the water off

Id say this is a good possibility as to the cause. Drove the hell out of it on the way home and its running great

Really appreciate you chiming in on this

 

I wonder if your rad got wet, creating a strong evaporative cooling situation that cooled your truck down and the ucon wasnt happy about it.

 

The rad definitely got soaked, i was washing off a lot of bugs off the front from hwy driving.

Sounds like this could have happened. Maybe coolant dropped in temp quite a bit and UCon said no way

 

No problemo. if my memory serves me correctly, the engine temp needs to be above 160 before that limiter is lifted. It's possible that it wasn't up to temp. However, I will say this: Ever since the install of the UCON, every once in a while, when I'm turning and specifically accelerating, the truck acts like my foot slipped off the throttle. No warning, its like your expecting a little throttle, then nothing. I don't ever see a CEL or any other warning. If I continue to press the throttle, the truck will finally respond. I went through so many changes when I installed the ucon, that I'm still trying to track down if I've gotten something else going on, but it is really, really weird behavior. Someday, when I actually have time I intend to data log it for diagnostics. Does guardian mode display a CEL?

 

To me it sounds like you could've soaked the air cleaner as well....with so many folks having issues with water and the URD true cold air intake, I would think this could be your issue......

 

Interesting, yeah every once in a while the UCon just acts a little funny. Not sure if that's what caused it today, or if it was just not up to temp. Probably wasnt up to temp or air filter related if i had to guess.

Guardian mode will not display a constant CEL, from what i've seen, it flickers on, and then shuts right off... Pretty much blinks really quick, so it makes it easy to miss it.

Very good possibility this is the case. I am going to be driving it a good amount this weekend, so ill see if i have any more issues

 

My truck does the exact same thing with the loss of power. It always seems to be right at the beginning of 2nd gear. I have seen no light flash quickly or anything. I have noticed that if I drive the truck nice it does it more often. If I drive it like it is stolen it rarely does it. But it is starting to get really annoying.

 

Ok. I’m glad it’s not just me. I did sooooo much work (changes) at one time, including install of the ucon, injectors and 7th injector, new engine, new intake, headers, electric fans, radiator, retired the entire charging system and more. I knew tracking down gremlins would be difficult. However, this seems to be the ONLY real gremlin that’s popped up. Surprising actually. I haven’t spent any time with URD on this issue. I’m sure it’s something they could resolve if we data logged it. I have an HPtuner sitting on my desk along with different 650cc injectors. I’m thinking about just making the switch...

 

I need to datalog I guess. I won't be making the change anytime soon. I have so many other things in front of redoing something I just did. Although some of those things are redoing what I have done, but it was longer ago so they are easier to swallow. LOL Are you having any hiccups with the larger injectors and the Ucon? I have read that the Ucon doesn't like larger injectors for some reason. But the HPTuners is very tempting as I believe that is what about everyone around here tunes with.

 

Does anyone know if the Ucon manipulates the gas pedal signal like the pedal commander? Or can we run the pedal commander and the Ucon? There have been lots of talk around here about how much the pedal is increasing peoples gas mileage.

 

I don't think the UCON manipulates the pedal signal. It probably can (much like the HPtuners), but they elect not to. I do believe that a pedal commander will work with a ucon as the signal is "upstream" of the ecu. I'm not sure if you'll see better mpg's unless you keep your foot out of it.

 

@Athlaos is running a sprint booster or pedal commander (cant remember which one) and he said it made a difference, which would lead me to believe UCon does not manipulate the throttle signals.

Once i finally get some time to disconnect my ecu from my UCon, i plan on reflashing mine with HPTuners for the throttle mapping benefits.

 

I think UCon does manipulate throttle map, however it doesn’t manipulate it enough to overcome the effect of the pedal commander. It does work quite well. @mr.trd

 

Awesome, thank you guys! Now I just need to decide if I think it would help my mpg at all. I know it is for others with a bone stock 4Runner, but haven't looked into it much for the older 2nd gen taco.

 

Have you had time or planned on any datalogging on the 2nd gear bog down at all.

 

2nd gear bog down?? @BassAckwards

 

I think both @mr.trd and @DocME have auto transmissions, so the 2nd gear bog down they're referring to might be different than what us 6spd owners are accustomed to.. Curious what they mean though! when i was having issues with my first UCon, it would act up (lean out on one bank) primarily in what some would consider "bogging" situations. So if i was cruising along in 3rd gear at 35mph, and i floored it, it would act up more often with that. What kinda problems are you guys having with 2nd?

 

Yeah we have auto's. When I drive like I normally do, like I am in Mexico, everything is good. But if I try to drive like nice old lady when it shifts into second gear it kinda stalls or bogs down until about 2500 rpm or so and then it goes back to normal. It normally is never felt but I am trying to get better mpg's around town so I have more fuel for the weekend and camping/towing. I don't want to fill up once for the work week and then a couple of times on the weekend depending on how far away we camp. And I will say that it does it about every time when I am towing because I am driving normally and not trying to blow up the rear end off of every light. Boost for towing is better in the higher gears, down low I just baby it and let the gears do there job and keep the heat out of the transmission. So it is only low rpm, light throttle at the beginning of second gear.