I noticed a difference in acceleration when I swapped tires from stock (P265/65-17) to AT (LT265/70-17). It takes a lot of power to overcome the extra rotational inertia from heavier tires. This should be especially apparent with 33s. And I'm sure all the additional weight from your skids, sliders and bumper (+500lb?) don't help either.
Now I am REALLY wondering about my V8
- Thread starter Staceman
- Start date
Bonyfattony
New member
Honestly it just be the gearing. I recall prior to putting all terrain tires, the 4Runner would haul ass. Now with bigger tires and gear, it's sluggish but I'm sure if you regeared to 4.56 you'd haul once again.
Question....Don't these 4runners learn your driving styles/habits and adjust tranny shift speeds and such to that style? Mine does the same, but I am easy and rarely ever get on it so it my belief is that it tends to shift differently and slower. When I do get on it it will take a second for it to downshift, but when it does it does launch and have good power. . . . and thats the '04 V8. If true OP, could your 4runner normally be riven easily without always quickly getting on and off the throttle? I believe you can do a reset and it will relearn your habits, but others would know better than me.
+1 for the sluggish-ness/hesitation.
I'll be curious how this thread evolves. My thoughts centered on either a seized caliper, or something with the electronic throttle. It seems to me the sluggish hit the gas wait a beat or two for the power to come on thing happened after a service at the dealer and a flash of the ecu.
I'll be curious how this thread evolves. My thoughts centered on either a seized caliper, or something with the electronic throttle. It seems to me the sluggish hit the gas wait a beat or two for the power to come on thing happened after a service at the dealer and a flash of the ecu.
black4vcobra
New member
Something must be up with your 4Runner, mine with 106k feels plenty strong. If you are really concerned you could go find an AWD dyno, I think that the 05-09 4.7's put down low 200's to the wheels.
After reading this thread, I am going to clean the throttle body though just to be sure that it's making all the ponies it should.
After reading this thread, I am going to clean the throttle body though just to be sure that it's making all the ponies it should.
Staceman
New member
Thanks for the offer Velonici!
I live in Surprise, work DownTown Phoenix. Perhaps meet 1/2 way between you and Downtown sometime? I'll buy your lunch!
From what I've read, I think new air filter and plugs. Pull EFI fuse to reset the computer, while I do a total clean of the throttle body and clean the MAF sensor, plug the fuse back in, and drive like a bat out of hell for a few days.
We'll start with that.
Staceman
New member
Also need to mention,
If I'm cruising along on the freeway and maintaining speed..
Press the gas pedal just a little bit..... nothing.
a little bit more, nothing
a little more again, nothing.
Yet a little more, nothing, still no speed increase.
A little more again, KICKDOWN!, now it's got power...
And all these years, I though that is just how it is....
If I'm cruising along on the freeway and maintaining speed..
Press the gas pedal just a little bit..... nothing.
a little bit more, nothing
a little more again, nothing.
Yet a little more, nothing, still no speed increase.
A little more again, KICKDOWN!, now it's got power...
And all these years, I though that is just how it is....
Staceman
New member
I know where your coming from Bonyfattony.
I know what you mean when I ran 33" tires on my 85, with stock 4.10s.
horrible.
4.88s made that all better,
But there was really no change taking this rig from stock 31" tires to 33" tires.
I was expecting more of a power loss, but it was minimal to say the least. Not much more of a slug as it was before the tire swap....
No problem man. Just let me know. My daughter flys in on the 16th and we normally go to the Wildlife Zoo at some point. So if you would like (and dont mind waiting a bit) we could meet up when I'm out that way since its just south of you. Or we could meet up before then. Up to you. Like I said Im in class Monday - Thursday from 7-9am and dont work (Hurray GI Bill) so really anytime after that.
Marcados
New member
I've been experiencing similar issues. I have a 2007 V8, with about 129K. I've replaced the exhaust manifolds and y-pipe with the Magnaflow OEM replacement parts within the last two months. I threw on a Magnaflow catback while we were at it too (not as droney as I thought). Maintenance is up to date, and the front calipers were replaced about a year ago. Still feels sluggish to me. I ended doing a seafoam treatment on my intake, thinking I might have a little carbon buildup. The truck really didn't smoke as much as I thought it would, and it didn't impact performance what-so-ever. Mileage has been steady, you'd think you'd see a relationship between performance and mileage, if something were amiss. I will say this, my brake pedal is fairly touchy, I wouldn't be surprised if a caliper was stuck.
brendan1026
New member
After reading this thread I went for a ride and noted that my 4 runners hesitation that is annoying me is actually the kick down time. When I'm cruising along and push down on the pedal looking for it to kick down a gear for faster acceleration there is a 1 or 2 second delay between the time I hit the pedal to the time it actually kicks in and starts pulling hard. Once it down shifts the power is there. It's just the delay that's bothering me. I've driven many different vehicles and this is by far the slowest down shift response time I have ever felt.
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