Steering/floor vibes? Clean your MAF

https://www.tacomaworld.com/threads...ion-sensor-cps-failure-in-2016s.442304/page-9

Post #180 has some good info. Part number in there too, the new cps and old have the same part # but can be distinguished as the new ones have a "hash" mark as people are calling it. I'm not sure that this will be the same exact sensor replaced thru the recall, it probably will be, but the whole anti corrosion coating thing seems unique.

Some people led me to believe it was easy, but I could not for the life of me get my hand and ratchet into place. Took me like an hour, if you have skinny long arms, 12 point socket, and a few different configs of ratchets you'll be ok.

 

Thanks for this... for some reason I couldn't find this through search for the 3rd gens but when I did a google search it showed me the 2nd gens which appeared to be a much bigger pain to access. This "looks" simple but I can see how it may be difficult to access, I'm still gonna give it a shot. Not too expensive and it's worth the try to avoid yet another trip to the dealership where they'll plus into TS while the truck is parked and say "normal"

 

Went ahead and ordered the new CPS... feeling a little silly throwing parts at this new truck, but I'm not currently listed on the recall list and something has to be causing my misfires (and likely slowly leading to mucking up my MAF). Inconsistent is the word of the day... on my way to work this AM, vibes were down considerably from yesterday and it wasn't annoying to drive... but my readings showed it slowly going leaner and leaner in fuel trims to where it's rarely sitting at zero again. No change in gas mileage either - traffic wasn't too bad, moving pretty steady around 50-60 mph without a lot of stop and go - still running @ 16 mpgs. Multiple misfires recorded throughout the trip. Have noticed an uptick in my testing when running in S-4 vs. Drive, but who knows if there really is a true correlation at play or not.

For now, I'll get the $100 part in and replace it and see if that helps w/ the misfires. If not, at least I'll have a backup in the truck in case it does ever strand me as some others have experienced. May be something to this though. When I've had the worst issues has generally been on a HOT day with the A/C running and I know some have called out that there could be a correlation between hot soak and CPS issues (i.e. sitting in a parking lot on the highway on a 90+ degree day). My engine / coolant temps are within range though... Will report back, but still am not experiencing the significant bogging and fumes that I did before cleaning my MAF which is something.

 

I don't think the CPS will be the root cause. I bought a new one and installed it (agree its a pain to get to, easier if you take tire off which is what I did) and I still have symptoms similar to what you describe from time to time. I'll stay tuned to see what you figure out though. I forget the thread, but @Scooby24 had also logged some data on misfires at some point in the past. Not sure if he came to any conclusions.

Not sure if you mentioned it yet, but what reader and app are you using for your data collection?

 

Carrista reader, OBD Fusion iPhone App w/ the Tacoma PID pack upgrade.

 

I didn't log any significant misfires, nor saw knock correction occurring in realtime. I'm not on the CPS sensor recall list and since I started driving in ECT + S6, I've got no real complaints anymore. It drives fairly consistently, keeps a reasonable gear, doesn't lug, doesn't surge...overall I'm fine with it at this point. I'm still looking forward to OVTune giving it their touch to hopefully improve torque below the curve and perhaps even sharpen up the speed of shifting, though.

 

Sorry, I remembered wrong. Carry on!

Good luck bshammer0, I don't have much else to contribute.

 

Here's latest update from last night where I was recording 1 to 2 misfires on a short trip home from the store. Fuel trims almost entirely in the negative - i.e. lean (while still barely within the -15% to +15% range. Meanwhile best I can tell O2 sensors for B1 and B2 are showing rich at the same time as is the actual A/F ratio (which was less than the target when the misfires occurred...) Still feel like this could be a fuel delivery issue somehow but who knows.

 

fuel trims in the negative means you're running rich for the commanded AFR and it's pulling fuel to try and lean it out. The negatives are a percent of the commanded fuel that it scales back on.

 

Page 3552 of the FSM has the monitoring strategy for random misfires.
I am not surprised you don't see a MIL or DTC.

 

thanks - I now see I read that one backwards in the FSM... so I suppose it's rich all around then?

 

Found an aricle you might find interesting.

http://www.austincc.edu/wkibbe/lambda.htm

 

It's the number of events - I know it shows the misfire and then holds it in memory for a certain number of revolutions and from what I'm seeing it generally shows for a solid minute in the logs across all data points. But again, I'm still learning and trying to make sense of it. Thanks to this thread I'm slowly learning!

 

Bookmarked for nighttime reading - looks high educational and will help me make better sense of the FSM!

 

Alright daily report. Truck, besides the weird vibes during acceleration, is still driving great. Would have got over 23 mpg going home but hit bad seattle traffic the last couple miles. Ended up at a measly 22.0 mpg.

As far as the OBD fusion, I had a technical difficulty apparently. I hadn't loaded the PIDs driving to work, so the log from my morning commute is useless and then for some reason the app gave me messages saying that it could not communicate with the truck coming home. Log didn't record.

However, if i'm reading the app correctly, I had a misfire on cylinder #2 and #5 going home. I think the 3 small blue values for any given diagnostic tool display represent the min, mean, and maximum values recorded by the app. This explains why some cylinders read 0,0,0 and the misfires are 0,0,1 or 0,0.1,1.

OP, please let me know what PIDs you would like to see tracked to compare against. Hopefully we can find a common condition that is causing this. Oh, and you might want to cancel that CPS order

 

Interesting to see at least something. Mine drove pretty well coming home today as well... drove in ECT S6 and long day at work so I didn't hit traffic. Got a near record 17.5 on the way home today....

Would love to see:
Long FT (b1s1 and b2s1)
Short FT (same as above)
All cylinder misfire count and the misfire for each of the 6 cylinders
Both Target and Actual A/F ratio
Lambda O2 sensors (for both banks)
MAF
Manifold pressure (which I think is a calculated PiD)
Torque
Power
RPM
Speed
Gear
High pressure fuel pump (both pressure and the discharge rates)

Those are the main ones I've been paying attention to. I'm a data / software guy by trade so when I get the time I plan to do some thorough graphing of this to see if I can spot the long term patterns. On my way home today, the truck drove pretty well - not as smooth as it has at times on the same routes but the steering was dampened more. Yesterday and the days prior I felt every single pebble and imperfection in the road pulsing through the steering wheel. Today none of that really...

And yes probably jumped the gun on the CPS... and was so excited I ordered from a shop that ships same day. I'll probably do it for the hell of it just to eliminate potential causes. Bc the MAF clean absolutely made a difference in lugging and emissions but from what I'm now seeing it does look like there's a lot of richness going on which I guess could presumably be kicking crap back onto the sensor and absolutely would have caused the smelly cat issue I had last week (and a couple months back...)

Thanks for posting your updates!!

 

Most times I'm recording the misfires is soon after startup or on acceleration, at least that's what I'm seeing from th last few days worth of data

 

I predict a hit in fuel economy after this weekend. @JLee is shipping my sliders tomorrow

 

today's update. MAF and manifold pressure continue to decrease following my clean (and I assume the accompanying relearning that occurs). This morning specifically, the truck drove as well as it ever has. Very little to no road/engine vibes passing to the steering, etc., and it was one of those days where I actually felt proud and happy to be driving the truck...

That said, my readings indicate that it's slowly running richer and richer and I had at least 2 events where 2 misfires occurred across random cylinders.

I simply have little faith that the truck won't revert in terms of drivability, especially if it is indeed running rich and starts to adjust in other places to compensate but each day it drives well is a win. Even if I'm doing long-term damage to my trucks exhaust, engine, or whatever else due to recurring misfires. Mileage is holding steady around 16 even when driving in 45-55mph traffic that's NOT stop / go.

the last 2 trips I did take another's advice on here and have driven in S6 + ECT which did "feel" better. i've never done S6 thinking "what's the point" so when I have used S-mode it has normally been in 4 and sometimes 5 depending on the type of drive.

 

Holy crap. I drive mine in "D" and if I drive a steady 45-55mph in non stop/go traffic, I easily average 22-23mpg. Even in my daily stop/go traffic (22 miles one way) I average 20-21mpg.