Truck jerks forward at stop?

[xmytruck]

Hello
I picked up a new 08 4Runner sport I love the truck such as smooth ride compared to my xterra. I only have 700 miles on the truck and started noticing an issue. Basically when I am at a stop in drive the engine will rev up to about 900 rpms and truck jerks a little forward if I do not have my foot firmly pressed on the brake. I was wondering if anyone else has run into this issue or is this normal? I notice a tread was started about a U joint noise and 4runners jerking at a stop or at low speeds I am not sure if my issue is the same.
Thx
X

 

[simple]

I saw a news story that said the 2007 Taco has had serious issues with this. DIdn't know it was in the 4runner as well.

 

[toto]

This is common. I've found I need to hold the brake pedal a little harder on the 4Runner than I have with other vehicles. This is especially true if the air conditioning compressor kicks on and off, and the RPM changes as a result.

The 2005+ Taco owners over on ToyotaNation believe it's a faulty brake booster and want a recall. I really don't think it's a defect, but I guess anything is possible. It's a big engine, so it's not like driving a car. There's a pretty big and sudden change in RPM when the A/C does its thing, and I think that's the issue.

The jerking/driveshaft clunk is a whole other issue that seems to be a design flaw, albeit a non-critical one.

 

[AlphaQup]

I've read about this topic in past posts and also it's pretty common from my own experiences as well. Basically whenever you have the Heater or AC on, the motor will throttle up intermittently to compensate for the power loss, thus you'll see a momentary rise in your RPM gauge.

If you've never experienced this before, you'll definately be alarmed. Especailly if little Miss Daisy is waiting for the light to turn green in front of you 2 feet away. Just keep your foot firm on the brake pedal and you'll be fine. Turn off your Heater or AC and you'll never feel this again.

Correct me if I'm wrong guys.

 

[witchdoctor]

my 05 v8 4x4 does the same exact thing, since I bought it brand new. That few hundred RPM at/near idle really affects the truck.

It's very difficult to modulate brake pressure to stop smoothly.

When braking using mild foot pressure:
1) ac compressor on, the truck will stop suddenly if ac compressor switches off;
2) ac compressor off, the truck will overshoot stopping point because ac compressor will engage causing engine rpm to increase... causes driver to press brakes harder.

My wife HATES to drive the truck (which if fine with me) for this reason.

I asked the dealer if computer could be changed (reprogram computer such that it leaves the idle alone when ac compressor engages)... they said: "duh?? all Toyotas run like this and the computer cant be changed. Man, I hate the dealer(s).

Maybe figure out a way to have the brake lights engage the ac compressor so that it does not cycle on/off while braking. Suppose thats not realistic....

 

[burton6509]

ITS THE 4 WHEEL DRIVE THATS WHAT TOYOTA SAID

 

[SciRunner]

I recall that Hill-Start Assist Control is always on. Maybe the computer is thinking your at a hill and jerks the truck forward.

http://www.autospectator.com/cars/t...ill-start-assist-control-systems-enhance-road

quote: "The basic function of the HAC system is to help increase control on steep upgrades and stopping and starting on slippery surfaces. The HAC system is designed to help prevent the vehicle from rolling backward or slipping sideways during transition from a stopped position to climbing an upgrade. The system is automatically activated when the transmission is in any forward gear. The HAC system controls the brakes to help stop the individual wheel or wheels, which helps prevent the vehicle from rolling backward or slipping sideways."

I say put your foot down even more. The 4Runner is a beast that must be tamed... LOL

 

[toto]

HAC won't move the truck forward - it just helps prevent you from rolling backward.

 

[xmytruck]

WOW so many responses, I think I am going to like this broad.

So the issue I am having is expected with 4R, well thats good news I guess. I am about to bring my 4R for the first oil change and was going to tell them about this issue but if everyone else is experiencing the same thing no point in doing so.

With my old xterra I never had this issue, but then again the 4R has 70 more kickers.
Thank YOu
X

 

[Mike07SE]

Mine does this too. I've just learned to readjust to this little quirck by making sure I have my foot planted on the brake a little more so than I would have with previous vehicles. Believe me, these brakes are awesome on these trucks and wouldn't trade this little issue for anything.

 

[Fuzion]

Mine does it too and so does our 2005 LX470, both full time 4x4

 

[drmorbius]

I don't know if this will help but I recently pulled the negative terminal on the battery to reset the computer and it definitely idles slower and smoother.

 

[magnumfan]

Its the tollerance in the drive line...

Guys, I have a 2006 V6 Limited. Mine has done exactly this since new. Each time I get it serviced I mention it to my service advisor, they get the tech to grease the drive line and it stops for a few thousand miles.

It it caused by nothing more than the manufactured tollerances between the various parts in the drive line, as the car changes down into first gear when you are sitting at the lights and the system applies torque to the system (essentially getting ready for the car to take off from the lights)

Grease all the points in your drive line and it will go away

Happy New year everyone

Regards

Joe

 

[Boston_Runner]

WOW so many responses, I think I am going to like this broad.

So the issue I am having is expected with 4R, well thats good news I guess. I am about to bring my 4R for the first oil change and was going to tell them about this issue but if everyone else is experiencing the same thing no point in doing so.

With my old xterra I never had this issue, but then again the 4R has 70 more kickers.
Thank YOu
X

xmytruck, let me guess, you have a V8 4runner. This is a common problem with the V8 runner and the GX 470. There is a TSB out to fix this problem that has to do with replacing the rear drive shaft and the rear lower control arms with re-design ones, but unfortunately, it is only for the GX 470. Toyota decided to go with the cheaper solution of greasing the driveshaft. There is nothing wrong with that and it works, just do it every time you change your oil and you will be fine.

 

[xmytruck]

Hi nope I got I a V6..

 

[magnumfan]

Hey xmytruck

Hi nope I got I a V6..

I have the V6 2006 year model. Mine has done it since the test drive. Just get toyota to grease the drive line when you change your oil. it wont do it anymore. peice of cake.

all the best

Joe

 

[neoflex]

Mine does this too and it's an 08 Urban Runner with the V6. Caught me off guard the first time but didn't startle me as my Rubicon is notorious for this and it is far more extreme in that thing to the point if your not paying attention and too close you will definitely hit the car in front of you.

 

[nc211]

An easy fix that will also eliminate the clunk...... put it in neutral. Also, if you put it in neutral when coming to a stop will let you stop more smoothly, as the brakes are working against the torqing of the gears as they downshift. Plus, you save gas..

 

[jlaud]

My 05 V8 Sport does the same thing, it's easy to miss slowly moving forward if your not paying attention since the damn thing is so smooth. I also have the jerking/thumping, but only when driven more aggressively. If I take it easy I never get the jerking/thumping, and get 18mpg city. But its hard to take it easy since that V8 sounds so good.

My father's 04 Sport V8, my colleague's 99 Landcruiser, buddy's 2000 4Runner Limited all show the same symptoms.

 

[T?@\7]

my truck does it also, but not since new. it seemed to start up out of nowhere and it bothers me..... at night do your headlights dim/brighten w/ the rpm fluctuation? And my truck only does it until its warmed up....

dealership doesnt know....