Steering/floor vibes? Clean your MAF

Mass Airflow sensor. I'm still learning myself honestly so this will be an uber-simple explanation, but it's an integral part of the engine making the right air/fuel ratio based on injector volumes/throttle position, atmospheric pressure, and the necessary injection timing. If your MAF is reading incorrectly (i.e. says the airflow is higher than it actually is, it could attempt to mix more fuel than you have air to burn, kill gas mileage and chug a lug when you put it on the accelerator.)

 

Located on the backside of your intake (that is just to the engine-side of the airbox where your engine air filter is located)

 

Thank you very much!

 

This thread has me curious now ... however being lifted and on mud tires I have some of this as a given, seems to be more apparent lately however.

 

Here's more data from the morning commute - still see intermittent misfires (only 1 at a time), and this time it did capture misfire in Cylinder #5 but it's sporadic so I don't think it's a cylinder issue. Perhaps fuel injectors? What I know to be a correlation is that a couple of weeks ago when my steering felt soft and smooth is that I did NOT hear any chirping from the high pressure injectors. Whether causal or not, the chirps are still there and quite loud.

Hoping someone on here has some chops to do some quick analysis and let me know if you see any correlation between Fuel / Air / Pressure and the misfires to get to the bottom of this. Still no codes thrown, but I definitely can usually feel the common "slight miss" feeling. Hard for me to believe they designed a truck to misfire intentionally, but who knows....

 

Just ordered one off eBay and I'll run this and see what type of reading I get from my truck for comparison.

 

Great. Once you get OBD Fusion (assuming you are an iPhone user) you'll have to go into the settings and adjust your logs to capture the desired data points. Also, you will have to pay $9.99 for the custom package of Toyota specific PIDs but totally worth it as you get access to what I assume are all of the supported sensors in the truck vs. the generic SAE ones.

Looking forward to having some comparison data here. The misfires are troublesome, and no codes thrown is just as worrisome

 

I thought you might have been using the Toque app which is android specific. I actually have a carista, I'll install OBD fusion and see what I can make of it.

 

I'm not an expert and not sure how the programming in the ECU works and I'm just thinking out loud again but the missfire might not actually be a missfire and could be the ECU telling to engine to not fire to allow the engine to free spine or to allow the revs to drop. Again not an expert and just brainstorming and not trying to assume there is an issue with your truck and assuming there is a reason for the missfire readings.

 

I assumed the ECU in these trucks managed the engine the same way that older fuel injection engines and the gen 2's ECU controlled the engine but after reading @OVTune post and aseeing that toyota wrote some crazy programming to control their engines it blows my mind because just from what I am seeing it looks like if any sensor fails and throws off the programming then it basically cannot run and you end up dead on the side of the road like a lot of people on here are experiencing. It almost seems like it causes a domino effect and I'm assuming that a couple people that have had premature cat failures were probably due to a failed sensor that causes the ECU to allow the engine to run in a rich or lean state cause if the cats to burn up and overheat and possibly be the cause of all the cps failures. I'm thinking out loud again and could be completely wrong and not understanding the complexity of toyotas new engine management system but I do work in electronics and more specifically with radars and radios so I kinda understand how complex these systems can be. Just my $.02 and hopefully I'll learn a little bit more about these new trucks and keeping my fingers crossed in the hopes that we see some significant gains out of these trucks.

 

Yes - the domino effect is what truly scares me. And the fact that I have had at least 3-4 occurrences where I've smelled bad sulphur coming from my exhaust which then eventually goes away doesn't make me feel good about my exhaust system or fuel management. I mean SERIOUSLY, this whole thread would make a lot of sense if in a 2nd gen with a bunch of folks talking about their 200k mile+ trucks where undoubtedly you'd be expecting some sensor issues to surface (which I bet they don't to the extent of the 3rd gens). This is a practically brand new $35k pig with lipstick on it at the moment. Looks like a tough chunk of awesomeness, then you start it......

Looking forward to seeing what others can see from the data.

 

Does the OBD read codes or does it just collect data from sensors? Never owned an OBD tool

 

I just happened to have one of the master techs that was walking by take a peek at your initial post. He said interesting, then went on to explain they learn how you drive in response to the lack of power issue. Like I said, im running 35's on a 6" lift ... I shift my truck however, its never in D.

 

I've owned more cars, trucks and motorcycles than I care to admit to and worked on all of them. Been working on cars for 25 years now so I have plenty of experience turning a wrench and built plenty of carbureted engines and even built a 76 corvette with a small block 350 that I ended up converting to fuel injection and running a pro-flo EFI system on it and the controller for that would tell me how the engine was running in real time and could see if it was running rich or lean and now Toyota has thrown us a curve ball and giving us the complex ECU but hopefully open up the doors and allow us to tune our trucks to run more efficient while also giving us more power. Keeping my fingers crossed

 

Only bad part of having the ECU learning your driving habits is when you have more than one person driving the truck and both people have completely different driving styles. My wife drives like she's trying to qualify in a race and let's just say she tells me I drive too slow most of the time.

 

I guess that's a good part of being single! Definitely a big factor however.

 

Tell her that Toyota told you that YOU and ONLY you can drive the truck for the next 10,000 Miles, because it has to "learn"....

 

Indeed. The fuel management seems so guardrail to guardrail, but at least from a fuel trim standpoint it does appear as though I'm running lean when the misfires happen most of the time, but then goes into a rich state pretty quickly. Always hopping around - and I know some of this is absolutely expected, but it just seems to be so all over the place and I'm noticing the impact on performance much more clearly now that I'm running the live data while driving. if nothing else makes me feel less crazy that its not just an opinion on my part.... but still doesn't solve the issue.

 

Are you M/T or just driving an auto in S? I hate the learning bullshit. I drive in stop/go traffic 5-6 days a week, sometimes more. then 2-3 weekends a month, I take off on long trips of 200 miles + each way through mountains, etc., often driving 80. Learning sounds good in theory, but I want it to adapt more quickly if it's going to do that. Even when the truck was running "well" I would notice my first stretch of 100-200 miles where the truck almost seemed confused by the differences in driving style - like it thought I wanted to tap the gas, then the brake, then the gas, then then brake with slow acceleration. It would eventually seem to work it out, and then would chug really bad when back in traffic which led me to my initial battery reset.

I'm still just worried this shit is reducing the longevity of my engine / transmission. And since I bought this truck for a 10 year vehicle... I'll be shocked if it lasts that long now and wouldn't recommend to anyone. But for now I'm stuck with it and want it to work!

 

Mine is A/T, I stay in S mode pretty much. I noticed a dead spot in 2nd gear for a bit before the update, seems to be better now. 5th & 6th are absolutely useless to me, I pretty much stay in 4th.