well...what did he say in the voicemail? maybe he was just letting you know that he was following up on it, but if he provided more info i'd like to know what he had to say.

 

just following up and wants more information, and said they are opening an investigation on the issue.

 

I got a call about noon today from them. Wanted me to describe the situation the surging occurs in, to him. It's so random I couldn't say anything specific. I've had the truck about 7 months now and seem to notice the surging about 2-3 times a month. He asked about uncontrolled acceleration with downshifting. I thought he was talking about the cruise control thing but he said no, I've never experienced like that. He mentioned something about the computer learning driver patterns as an area they are looking at as a source of this phenomenon. They are opening an investigation on this issue.

 

ive actually noticed the downshift acceleration, thought that was part of downshifting, hmm

 

Brake? Surge

When I first got my truck and read every post on everythread here (yes it's true I was a lurker) I read the many complaints about the surge while stopping or being stopped and have it feel like you got rear ended. I too ws having all of the symptoms described but it wasn't thae brakes or the A/C . It was the transmission. Sometimes it ws subtle and felt like a little nudge that would cause me to roll a inch or 2 if I wasn't on the brake. Othertimes it was strong enough that I know I would have jumped into the guy in front of me.

One day I am looking at the maintaince that Dodge did before I bought my truck. (had 35k on it) One thing that caught my eye was they serviced the tranny and filled it back up but the fluid amount was off 6 OZ's. When it somewhere around 3 quarts to fill 6 OZ's could mean a lot. I crwaled under the truck (after getting it up to 115 degrees a like the service guide says) and opened the little valve that is supposed to drip when level is at full and got nothing. I took it straight to Dodge and turned out to be 8OZ's low.

I haven't had the surge once since then and it's been 6 months. Maybe there is more than one situation here but next time you ahve to be at the dealer it may be a good idea to ask them to check.

 

mine, and why i filed the complaint months back, is AC related. only happens when the compressor kicks in.

 

mine, and why i filed the complaint months back, is AC related. only happens when the compressor kicks in.

maybe i'm missing something but, thats normal. of course when the a/c kicks on, the rpms will rise and if you don't have your foot on the brake hard enough, while in gear, the truck will want to take off as a result of the raised rpms. almost like power braking. i don't get what the problem is.

 

theres several posts on this issue.. and actually 100s of complaints. this isnt the 1st car i have owned. i know what the compressor feels like in other cars.. they actually changed the design of the way the compressor kicks in on the 07s so its less jerky on the motor.. yet my 07 still jumps forward. any other vehicle with an auto doesnt jerk like this truck does.. i owned a 6speed 06 before the 07, and yes you can tell it revs up a bit.. but being a 6 speed with the clutch in/netrual it doesnt make a difference.

 

i know there's several posts on the issue. i just have never gotten it. i have driven dozens and dozens of automatic tacomas 05 and up and have never noticed the issue, that's all. i just think that if you have you foot on the brake, you won't have the issue.

 

could just be my model is this way too... i have ABS and trac and all that crap.. the brakes are really really really and i mean really touchy.. my buddy has an access cab 05 without that crap and his brakes are day and night to how mine feel. my 6speeds brakes also werent this touchy. next time you are down this way you are welcome to drive my truck

 

I believe I have this same issue, which is really pissing me off considering I just bought it less than a month ago. What I have is, when I'm stopped at a light with my foot on the break, all of a sudden the truck "jumps". Not a whole lot but enough that when I don't have enough pressure on the brake pedal, it moves forward a little. This what you guys are experiencing? Toyota WILL be hearing from me on this when I get home (in NJ right now).

 

now that i think about, my 07(5spd auto) does it also.

it also revs long before shifting...i'm thinking the tranny may need a check up...unless thats how toyota intended it to be.

i'll have them take a look when i take it in for the suspension...could just need a re-searvicing...

 

I get that too. In fact, it happened again today. I'd forgotten about it; only happens every so often. I hadn't really noticed it for the last couple of months.

 

I get it, and mine happens when the AC compressor kicks in, the rpm's come up and drive the truck forward a bit is my take on it.


any way to get ahold of these guys, or do they call you?

 

they called me about a complaint i filed. you can file a complaint online with them tho.

 

Yes...I received a call again from the NHTSA. I would have hoped this process was advancing to a some higher state. Rather, the call I received was from another NHTSA engineer, following up on my initial complaint I filed several months ago. I advised him I hadn't already spoke with an engineer at his office about this exact issue several times in the last 4-6 months. He advised he was not aware anyone from his office had down any leg work on any of these complaints. Good to see out tax dollars hard at work again! When I told him there were at least 6-8 formal complaints logged well over the last 4 to 6 months..I wanted to know why has this process is taking so long? Of couse..he had no answer.

This issue is not related to the brakes or the A/C solenoid. Rather, I believe, it's directly related to the transmissions extremely high 'head pressure' and/or torque converter.

http://www.tundrasolutions.com/forums/tacoma/90542-nhtsa-investigates-lurching/

http://www.toyotanation.com/forum/t182096.html

Again, as I've posted several times before, anyone experiencing or have in the past experienced the notorious 'lurch' please report it it to to your local Toyota service center and the following addresses below:



IVOQ - File a Complaint



Toyota Customer Experience
Phone: 800-331-4331
Mon - Fri, 5:00 am - 6:00 pm PT
Sat, 7:00 am - 4:00 pm PT
Fax: 310-468-7814

Or send correspondence to:
Toyota Motor Sales, U.S.A., Inc.
19001 South Western Ave.
Dept. WC11
Torrance, CA 90501

Ajit Alkondon
Safety Defects Engineer
U.S. Department of Transportation
National Highway Traffic Safety Administration
Office of Defects Investigation
400 7th Street SW, Room 5319-G, NVS-211
Washington, D.C. 20590
Ajit.Alkondon@nhtsa.dot.gov

I get it, and mine happens when the AC compressor kicks in, the rpm's come up and drive the truck forward a bit is my take on it.


any way to get ahold of these guys, or do they call you?

 

Yeah, my 07 does it too. My foot could be to the floor on the
brake, it still does it. It's rather strange. 'Only other car I ever
saw do this was a Ford Windstar which had BAD tranny problems.
I'm hopin' this doesn't go on long and maybe it's gonna chill out
after I get 1k miles on the truck or so. I'm feeling a little trepidation
about all the weird sh*t goin' on with this truck. It steers manaically
and then this surging thing. Good lord. I love the truck but WTF it
already needs the rear end TSB, it steers like crap and it surges.
*sigh* This is not a good feeling. :ugh3:

 

Yeah, my 07 does it too. My foot could be to the floor on the
brake, it still does it. It's rather strange. 'Only other car I ever
saw do this was a Ford Windstar which had BAD tranny problems.
I'm hopin' this doesn't go on long and maybe it's gonna chill out
after I get 1k miles on the truck or so. I'm feeling a little trepidation
about all the weird sh*t goin' on with this truck. It steers manaically
and then this surging thing. Good lord. I love the truck but WTF it
already needs the rear end TSB, it steers like crap and it surges.
*sigh* This is not a good feeling. :ugh3:

Mine did the same thing for awhile, then calmed down. I Had an 05 with 83,000 miles and it run very nice....:sosad: Just give some time and miles.

 

Like I said (Thanks Flyman) when I discovered my tranny fluid was low I had a feeling that was causing my surge. Checking the fluid level is a pain in the ass cause you have to it to the exact temp and then crawl under your truck. Mine was 1/4 quart low and obviously that was enough to cause the surge cause it's gone.

 

I've got an 07 Auto and I don't know what kinda of surging you guys are describing....

It's an auto and there are sooooooooo many different inputs/sensors that feed the computer with data which is translated and fed back to the engine that'll control all sorts of things (rpm's, shiftings, yadda yadd yadda).

Perhaps Toyota needs to look at the computer programming and come up with a 'computer flash' that'll correct most of these surging problems....?? I highly doubt its anything mechanical or tranmission related.

It's pretty normal if you ask me.....

 

I've had this "surging" and dont see it as a problem...but rather a quirk. Typically it happens when I come to a red light and wait there for a minute. From what I know about the truck it feels like the truck's computer is reving the engine a little bit to compensate for something else going on. For example if you turn your steering wheel while in neutral, you'll notice the RPMs jump a bit. Since this truck is drive by wire the computer is in complete control of the throttle and is constantly making minor adjustments. I don't know much about the brake system but the RPMs and brakes may somehow be related in the compter...complete speculation on that one.

So unless you're right on someone's ass I don't see how this could be problemmatic...annoying yes. However if you get more than a slight bunp it might be something to worry about.

 

So unless you're right on someone's ass I don't see how this could be problemmatic...annoying yes. However if you get more than a slight bunp it might be something to worry about.

While I generally agree with you, I don't make monthly payments on new vehicles only to have to tolerate "annoying quirks".

 

Well I have never been on a forum that didnt have people complaining about some annoying quirk their car/truck has and the Taco is absolutely no exception. I don't think you can find a vehicle that doesnt have something that some group of people out there isn't going to gripe about. Personally I don't find this issue annoying and have yet to find something on my Taco that does annoy me...so as far as I am concerned this vehicle is free of annoyances.

The car is a love affair. You find that person you love and you learn to live with their little quirks. If that fatefull day comes when you can no longer tolerate those quirks then there is a whole sea of new options to choose from.

 

I posted this statement in another post.

My 06 had done the exact same thing. It would happen about 1 out of 5 times. And it almost felt like you got bumped from behind. I spoke to the dealer and they said it was the the Torque converter releasing that causes the surge.

I thought it was crappy that it did it, but I always made sure to give myself enough room.

any yes, a new vehicle you are paying money for should not have quirks...

 

The car is a love affair. You find that person you love and you learn to live with their little quirks. If that fatefull day comes when you can no longer tolerate those quirks then there is a whole sea of new options to choose from.

lol, well stated