Steering/floor vibes? Clean your MAF

Great to hear, I may consider swapping mine. Have a link to the fsm?

 

You weren't on the recall list either; were you?

 

NO! It was definitely causing major issues. 2,000 RPMs in 4th feels buttery in comparison to before. Steering can be done with a single finger with ease - something that's not been the case since I bought it. Hard to describe how amazing it felt to drive it today, harmonics aside...

 

How much is a new CPS? I'm not on the recall list but I might do it for peace of mind

 

$100 - details over in the eminent CPS failure thread

 

Good to hear. I got 10.4 l/100km (22.6 mpg) this morning on the trip to work (2nd trip after MAF clean). I hit every light wrong too lol. So far, so good.

I'm an early build (09/15) and NOT on the CPS recall yet either.

Hmmmm, I suppose it's possible they could've used up older CPS stock on later 2017 trucks IF they actually corrected the crank rotor corrosion coating problem (the cause of the issue). I mean, the rotor was out of spec - so does Toyota leave it that way and use an altered CPS for the full model run, or go after the supplier to make it right? That's if corp even knows every last truck that's affected (bad batch of rotors).

Frank

 

Glad your truck is feeling better OP! My truck is holding well. Almost done with the second tank of 89 and the mpg gains are holding, general smoothness is noticeable, and my buzzy floor/pedals still exist. Some mornings when i start the car, they're completely gone and then return on the drive. 22.8 mpg going to work and 24.1 coming home. I've never seen that number before, and think it would be closer to 25 if i didn't hit stop and go the last 2 miles. I wonder what Id be getting with the bed unloaded, no shell, no rack and stock tires. This $7 fix is paying for itself.

 

I still have zero clue on earth how you get that kind of mileage in a gradient locale, but at least mine are inching closer to 20 and holding around 18.5 in Nashville traffic which is measurably better than before MAF and subsequently CPS. I do wonder if, given the positive impacts I had with the CPS swap, it may not be a terrible idea to even reclean my MAF just in case the incorrect timing driven by CPS was partly culprit. Not high on the list though as it's running pretty well for now so I'll probably leave well enough alone.

the vibes are so perplexing though. I too experience this intermittence where there are virtually no vibes, sometimes for an entire trip, then they come back. Doesn't make me want to drive it into a ditch anymore since other things are improved so much but at a minimum I'm going to have the dealer install the steering dampener that was part of the driveline angle TSB... i'll have to pay for it since I'm not "covered" by the TSB but the field tech I met with a couple of months back said "it's a $35 part that takes 30 minutes to install" so again, I'm willing to pay out of pocket for a chance I can reduce the steering vibes. Floor/pedal would be a major plus but miracles don't come every day... ha!

At the very least, I now feel like the issues I have remaining are generally the same most owners experience and just deal with. Now, if I come back here in another week or 2 and it goes to sh*t again on me... I'll force the dealership to investigate the fuel pump and O2 sensors. I still have a hard time believing this was designed to occasionally misfire but investigating the service manual it actually says "normal" is between 0-35 misfires per 1000 revolutions - REALLY!? - with a max of 255 so I'll stop chasing that tree for now.

 

finally installed the CARISTA and using the OBD fusion but not sure what setting to turn on the show miss fires and the other things that you are tracking so you have another vehicle to compare too.

 

If you go to settings then logs you will be able to select your pids. Misfire counts, RPMs, throttle position, lanmda O2 for both banks, short/long due trims, mass air flow, load % are the main ones I've been tracking but there's a lot in there. Have to spend the 9.99 for the special PID pack to get access to all the Toyota ones though. A lot of the SAE equivalent PIDs don't show data

 

The harmonics are just part of the deal with this, but indeed I believe much of the specific vibration in the driver's side floor / pedals is related to the cable that's quite loosely dangling next to the TC. Mine literally was resting on it but had so much slack it would be easy to see how (when the rest of the truck is in it's "vibe zone") that metal on metal contact loosely vibrating could cause some issues. 4 driving cycles with it "maintained" and VERY LITTLE vibe in the areas mentioned (steering still there, of course). I've taken some silicone adhesive surrounding it up against the cab now and have some painters tape on there to hold it together while it cures. I have another thread about it but since this was originally a VIBE thread... I'll eventually put together a full list

Cheers,
Brandon

 

Maybe take a look at the NVH app; might save you a lot of time and grief.

 

You're always full of great suggestions here! Looks like a cool app... may keep tinkering a bit before dropping $200 just yet but if I get to the mount where I need it I very well may do just that. Will see how the cable securing works once my silicone cures...

 

couldn't find the misfire but did get a couple of the other numbers and i did pay the $9.99 for the Tacoma PID pack.

 

Interesting - and thanks for sharing your data. At first pass it looks like our lambda overall are similar so nothing alarming there. You should be able to search for All Cylinder Misfire Count under Engine in the Toyota-specific PIDs to add it to the log for reference, then there are also PIDs for each individual cylinder.

One thing I did notice today since I have been tinkering with different PIDs to find any trends is that in the service manual it indicates the range for the Engine Stall Control F/B to be:

ISC torque lower limit value to prevent

engine stall/

Min.: -1024 Nm, Max.: 1023.96 Nm

And mine runs at -1023.99999 almost 100% of the time. Perhaps this is normal b/c these are designed to work on the edge but for most other PIDs even in suspect areas, the ranges seem so wide for "normal" so I am indeed wondering if there is anything to be concerned about here since it seems to be at the lower limit.

 

i think i am missing something because i dont see All Cylinder Misfire Count under Engine in the Toyota-specific PIDs or i am not seeing how to get to Engine in the Toyota-specific PIDs

 

1. Under Settings, hit Log Setup to access this screen


2. Select Toyota,Lexus,Scion

3. Select Engine


4. Use search to see All Cylinder misfire (or search misfire and add each cylinder individually in addition to the All Cylinder). Sometimes I see an all cylinder misfire recorded but with no 1's next to any cylinders. other times it does capture them.


Interested to see the results, but I'm honestly beginning to think this may have been designed to operate guard-rail to guard-rail a bit. Run it lean / rich until it misfires then recorrect? Ha! But the fact that he FSM says up to 35 misfires on a single cylinder in a 200 revolution range is NORMAL perplexes me..... I'm no engineer, but aren't misfires a bad thing?

 

All this said, my truck is a joy to drive at the moment. Even though I'm still seeing a misfire or 2 in a trip. I had some silicone cure overnight to secure the cable (would love to know which cable that is...) to the cab so it would stop rattling against the TC. Not much change in vibes elsewhere except a VERY clear change in vibes (reduced by probably 70%) in my gas pedal. Which leads me to wonder if bad mounts or loose bolts could be causing at least some of the vibes from the TC itself? That cable had tons of play in it so any amount of vibration and the metal housing around it would just rattle against the TC.

I'm still collecting data and holding my breath in hopes I've found the major problems (MAF, CPS, intake hose) that were making my truck feel like it was a complete POS about to crap out at any moment.... If it reverts to its former self I'll have the data. I'm going to keep it running for logs for the next couple of weeks minimum in hopes of targeting anything that degrades.

After 3-400 miles post CPS battery reset, D sucks again and wants to stay in 6th at 1,000 rpms climbing a hill but running S5+ECT around town is a blast now so I'm happy to drive it that way until (hopefully) toyota comes out with another ECU / tranny update...

Also encouraged b/c I previously did notice some decrease in performance on a rainy day with really moist air. Not today...and Nashville is getting the deluge caused by the tropical storm...

 

So after looking at your screen shots I went back to compare to mine and I am not seeing the extra Toyota PID's and noticed that it's not letting me download or restore purchases even though it shows I've purchased it already.

 

Here's my latest from today.... Truck is continuing to drive pretty well overall with solid acceleration, no bogging at all really (I'm driving primarily in S5+ECT) and steering continues to feel "easy" - not clear of annoying vibes by any means, but it's still holding steady. What's still odd to me are the misfires and I do indeed feel something with the high pressure fuel pump which I know they refuse to replace any longer could 'potentially' cause this? I graphed by misfires from today's commute home - there were several as you can see in the data. I did feel the "slight miss" feeling once, but otherwise didn't "feel" them but the sensors clearly picked it up and even had a misfire (at least one) recorded across 5 of 6 cylinders.

When I graphed it against a few different data points, the only somewhat clear correlation I could definitely see was regarding the fuel pressure. Rather than feeling a misfire on acceleration, what this data indicates to me is that the misfire occurs just AFTER I've accelerated and just after the high pressure fuel pump goes from a high condition to a lower pressure - and in traffic, often quickly decelerated to a near stop.

Perplexing but I am inclined to see if I can get my historically "zero help" dealer to look at the fuel pump. Any tips on that would be welcome... specific language to use to actually get them to test it? Sounds like they are just dismissing any fuel pump issues these days after replacing several for the cricket chirping in the good ole' days....