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Double cab v6 "bumps" at traffic lights

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Old 11-07-2012, 08:24 PM   #41
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Oh, I have the double cab with the towing package as well. Incase it is isolated to that specific set up.
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Old 11-07-2012, 08:29 PM   #42
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NHTSA has been looking into this for years. Until your truck uncontrollably takes off and runs off the road and possibly kills you, you won't get anywhere.

Just google 'Tacoma Lurch' and you'll see.


This is a very old issue and we're beating a dead horse here.
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Old 11-07-2012, 08:33 PM   #43
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This is not axle wrap.
I happens after you come to a complete stop and have been stopped for ~10 seconds or so while still holding the brake. The "bump" feeling comes and the truck will lurch forward slightly, a feeling as though the car behind you has just bumped into you. I find it incredibly hard to believe that this is the A/C compressor kicking on.

Again, this is not a scenario that happens as you're slowing to a stop or after you have just stopped. It happens after you have established a stop for a considerable amount of time.
'13 DC auto here also. I had an '06 that I believe did the same thing, so I'm fairly certain this is not a new issue.
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Old 11-07-2012, 08:37 PM   #44
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Quote:
Originally Posted by Mark922r View Post
I find it incredibly hard to believe that this is the A/C compressor kicking on.
The compression kicking on jumps your rpm's, causing more power to the wheels, ultimately leading to the brakes not holding the vehicle still. Think about it. You push your brakes to just barely hold the vehicle at 900 rpm's. the compressor kicks in causing the vehicle to jump up to, lets say, 1000 rpm's. this would cause the truck to slightly "lurch" forward and you would counteract by pressing harder on the brakes.

Not rocket science
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Old 11-07-2012, 08:38 PM   #45
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Quote:
Originally Posted by Detective_Dan View Post
The compression kicking on jumps your rpm's, causing more power to the wheels, ultimately leading to the brakes not holding the vehicle still. Think about it. You push your brakes to just barely hold the vehicle at 900 rpm's. the compressor kicks in causing the vehicle to jump up to, lets say, 1000 rpm's. this would cause the truck to slightly "lurch" forward and you would counteract by pressing harder on the brakes.

Not rocket science
This
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Old 11-07-2012, 08:39 PM   #46
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With how many other manufactures forums I have seen this on, not worried about it. It is not only isolated to Toyota.
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Old 11-07-2012, 08:40 PM   #47
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My FJ use to do the same thing. Toyota has a TSB on it for the FJs, dealer replaced my drive shaft with new one, took care of issue. I didn't know the tacos had same problem still waiting on my '13 to show up.
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Old 11-07-2012, 08:43 PM   #48
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Quote:
Originally Posted by Detective_Dan View Post
The compression kicking on jumps your rpm's, causing more power to the wheels, ultimately leading to the brakes not holding the vehicle still. Think about it. You push your brakes to just barely hold the vehicle at 900 rpm's. the compressor kicks in causing the vehicle to jump up to, lets say, 1000 rpm's. this would cause the truck to slightly "lurch" forward and you would counteract by pressing harder on the brakes.

Not rocket science
Maybe it is, in fact, rocket science because it still happens with the A/C off (and defroster). How do you explain that, Detective?

I get the mechanics behind a compressor kicking on and a rise in RPMs but I find it hard to believe that it would cause such a surge as to make the driver feel as though he was just assholed by the vehicle behind him at a light. Especially, like I said, when the A/C and defroster are not in operation. Even if that were the case, a sudden 100 RPM rise is insignificant and would not give the sensation of having just been in a collision.
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Old 11-07-2012, 08:46 PM   #49
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Quote:
Originally Posted by Mark922r View Post
Maybe it is, in fact, rocket science because it still happens with the A/C off (and defroster). How do you explain that, Detective?

I get the mechanics behind a compressor kicking on and a rise in RPMs but I find it hard to believe that it would cause such a surge as to make the driver feel as though he was just assholed by the vehicle behind him at a light. Especially, like I said, when the A/C and defroster are not in operation.
You also have an engine cooling fan that kicks on when you come to a stop, which will raise rpm's and cause the exact same feeling. Axle wrap also cause this same feeling. The force of the axle settling back in place will lurch the vehicle
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Old 11-07-2012, 08:49 PM   #50
This is my derpawayinator!!!!!
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Both my Tacoma and 4runner do this. There is nothing wrong with your truck. I worried about it too until I joined this site. No big deal. Both trucks have over 100k and still going strong.....
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Old 11-07-2012, 08:50 PM   #51
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I rarely use my ac and my engine is constantly changing rpm's at idle. Everyone's does. I have a manual though so I don't feel the effects as you AT guys do
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Old 11-07-2012, 09:04 PM   #52
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not to mention the ac will also still cycle even while off if either defrost setting is selected
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Old 11-07-2012, 09:45 PM   #54
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Quote:
Originally Posted by brian View Post
Detective_Dan is spot on IMO. A real sleuth
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And thanks lol. At least some people can read and comprehend
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Old 11-08-2012, 07:52 AM   #55
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In my opinion, it feels like the brakes are releasing and reapplying.
Maybe an idiosynchracy of having ABS with drum brakes.
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Old 11-08-2012, 10:52 AM   #56
Grab your helmet, this shits about to get retarded
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My Co-workers 2011 4runner does it, it sounds like the torque converter unlocking or locking. (happens with A/C and defrost off) It's extremely hard to notice, but it's there.
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Old 11-08-2012, 11:54 AM   #57
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answer one question and we'll stop talking A/C

Do you have the A/C on OR is the hvac control set to either of the 2 defrost settings?
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Old 11-08-2012, 11:58 AM   #58
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push the brakes harder at stops and you will not feel it. barely press them hard enough to hold the vehicle in place and the spin up of the engine will cause the bump.
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Old 11-08-2012, 12:20 PM   #59
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It lurches with ac off - I can feel the ac kick in

just like in all other vehicles ive owned. THis is a much more stronger sensation - As I said earlier I thought someone bumped me from behind. 60K miles and never did it until a few weeks ago. I would not find it acceptable in any vehicle - I like the truck ( have owed fords, chevys, and a tundra) but the lurch is bad. Also, dad has 09 - same truck - 120k miles - never done it. Thanks for all the ideas, think I will start by checking all hardware and changing trans fluid.
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Old 11-08-2012, 05:54 PM   #60
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My 12 SR5 DC bumps too, I just live with it. I, also, thought I was rearended when it first happened.

As for dective dan's theory, I would expect the "bump" to happen a lot more frequently than it does to me if that were the case. I run my AC and defrost very often and it only happens once or twice a week.

Also, tonight on the way home while at stop lights I kept a constant eye on my tach. Every time the compressor cycled my RPM's would jump up 100 to 200 and I never felt the slightest twitch. If the "bump" is due to RPM surge I would think they would have to jump 500 or more which I don't see happening.

I will be in the truck for 11+ hours this weekend so I will try to keep an eye on the tach when I am at red lights.

Quote:
Originally Posted by Detective_Dan View Post
The compression kicking on jumps your rpm's, causing more power to the wheels, ultimately leading to the brakes not holding the vehicle still. Think about it. You push your brakes to just barely hold the vehicle at 900 rpm's. the compressor kicks in causing the vehicle to jump up to, lets say, 1000 rpm's. this would cause the truck to slightly "lurch" forward and you would counteract by pressing harder on the brakes.

Not rocket science
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