09-29-2015, 08:29 PM
|
#1
|
|
Member
|
|
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
|
Member
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
What could cause unresponsive throttle?
Alright you gearheads, I'm stuck in the mud here and I need a hand figuring what in the nine hells is going on with my Runner.
Once in a while (usually several times per hour) I hit the gas from a dead stop and go nowhere.
RPMs don't rise, vehicle doesn't move, tires don't turn.
Here's the rundown of what I know:
1. It's not the throttle body. I cleaned that and it didn't help.
2. It has gotten worse over the last two months as far as frequency of occurrence.
3. Overall it will last from five to fifteen seconds per incident
4. It's really f'n annoying, and potentially dangerous
5. No engine light has come on.
I don't think it's the MAF, because no engine light.
All I can think of is fuel pump or throttle position sensor (going off what I've heard from others.
Other than that, I don't know where to begin. Any ideas? Similar issues? Words of wisdom?
|
|
Reply With Quote
|
09-29-2015, 09:48 PM
|
#2
|
|
Senior Member
|
|
Join Date: Feb 2014
Location: Minneapolis, MN
Posts: 1,465
Real Name: Samuel
|
|
Senior Member
Join Date: Feb 2014
Location: Minneapolis, MN
Posts: 1,465
Real Name: Samuel
|
I had the same issue on my 2002 and also on my 2001 and have yet to figure it out. I think it has something to do with fuel sending unit or something with it but could be dead wrong. For all I know it could be something with the computer not registering a throttle response too.
__________________
2001 Sport Edition 4WD, IJM, Auto, DD
1999 SR5 4WD, Millennium Silver Metallic, 5 speed, E-locker, Trail Rig
1998 SR5 4WD Custom bodywork from hitting a median. Beater truck.
1999 Limited 4WD No longer a vehicle. Now it's in parts and stored away.
|
|
Reply With Quote
|
09-29-2015, 10:08 PM
|
#3
|
|
Member
|
|
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
|
Member
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
Well, so far it's beyond me, so I guess I will have to bite the bullet and pay to have it investigated. I've tried to find out through the forums before but noone seems to know or want to hazard a guess.
|
|
Reply With Quote
|
09-29-2015, 10:10 PM
|
#4
|
|
Senior Member
|
|
Join Date: Dec 2009
Location: SLC, UT
Posts: 1,011
|
|
Senior Member
Join Date: Dec 2009
Location: SLC, UT
Posts: 1,011
|
Lots of things can cause engine hesitation like injectors, spark plugs, clogged air filter, insufficient fuel pressure, try sea foam in the gas tank with premium fuel first as well as pulling a spark plug to make sure they are Denso/NGK OEM.
__________________
2015 T4R TRD Pro in super white, Morimoto 4300K HID kit, Auer Engineering / Toyota LED DRL/Fogs 2-in-1's, TRD drop in air filter, WeatherTech front and back liners.
2002 T4R SR5 4WD Onyx Black Sport Edition w/Leather. Gone but not forgotten.
|
|
Reply With Quote
|
09-29-2015, 10:11 PM
|
#5
|
|
Senior Member
|
|
Join Date: Feb 2014
Location: Minneapolis, MN
Posts: 1,465
Real Name: Samuel
|
|
Senior Member
Join Date: Feb 2014
Location: Minneapolis, MN
Posts: 1,465
Real Name: Samuel
|
It doesn't happen very often to me so its low on my priority list but if you find out post it cuz I really want to know so then I know what to fix
__________________
2001 Sport Edition 4WD, IJM, Auto, DD
1999 SR5 4WD, Millennium Silver Metallic, 5 speed, E-locker, Trail Rig
1998 SR5 4WD Custom bodywork from hitting a median. Beater truck.
1999 Limited 4WD No longer a vehicle. Now it's in parts and stored away.
|
|
Reply With Quote
|
09-29-2015, 10:20 PM
|
#6
|
|
Senior Member
|
|
Join Date: Jul 2009
Location: SoCal
Posts: 1,788
|
|
Senior Member
Join Date: Jul 2009
Location: SoCal
Posts: 1,788
|
Quote:
Originally Posted by TJM
Alright you gearheads, I'm stuck in the mud here and I need a hand figuring what in the nine hells is going on with my Runner.
Once in a while (usually several times per hour) I hit the gas from a dead stop and go nowhere.
RPMs don't rise, vehicle doesn't move, tires don't turn.
Here's the rundown of what I know:
1. It's not the throttle body. I cleaned that and it didn't help.
2. It has gotten worse over the last two months as far as frequency of occurrence.
3. Overall it will last from five to fifteen seconds per incident
4. It's really f'n annoying, and potentially dangerous
5. No engine light has come on.
I don't think it's the MAF, because no engine light.
All I can think of is fuel pump or throttle position sensor (going off what I've heard from others.
Other than that, I don't know where to begin. Any ideas? Similar issues? Words of wisdom?
|
Since you don't say what year you have I'll guess it's a 01-02. I can't imagine a bad TPS causing you to go no where when hitting the gas unless you are fly by wire. My guess is, a bad TPS, bad thing is, if you are an 01-02 I don't think you can get just the TPS. I think you have to get the whole TB.
__________________
1996 SR5 4Runner V6 4WD Auto
Toytec Ultimate w/ OME 890's plus 1.5" daystar spacer
60028 OME shocks, Goodyear Duratracs 265/75 -16
B&M 70268 with Magnefine filter, 199mm TBU
236K miles
|
|
Reply With Quote
|
09-29-2015, 10:31 PM
|
#7
|
|
Senior Member
|
|
Join Date: Apr 2013
Location: Platteville, WI
Posts: 2,584
|
|
Senior Member
Join Date: Apr 2013
Location: Platteville, WI
Posts: 2,584
|
3.4L
Jokes, I got em'. lol
|
|
Reply With Quote
|
09-30-2015, 03:34 AM
|
#8
|
|
Senior Member
|
|
Join Date: Dec 2010
Location: Seattle, WA
Posts: 4,521
Real Name: Alex
|
|
Senior Member
Join Date: Dec 2010
Location: Seattle, WA
Posts: 4,521
Real Name: Alex
|
No one has mentioned fuel filter, but I'd be willing to bet yours is 13 years old and could use a change even if just for maintenance...
If I were in your shoes my first step would be to buy a scanning tool that's capable of monitoring fuel trims, ignition timing, all that jazz. With that, when the problem is occuring you'll be able to see pretty quickly if it's fuel related, ignition related, or neither.
Testing the fuel pump is simple if you've got a multimeter. There's an access panel under the rear seats that will allow you to check the resistance without doing any real mechanic work.
I think the TPS is also a simple part to troubleshoot, but I've never done it, so I cannot speak too much on that.
A scan tool would also be able to tell you if when you're giving it gas, the throttle is not opening, or opening too little.
__________________
2006 Lexus GX 470 Sport- RR Diff Lock, Metal Tech Sliders, RCI Aluminum Skids, Front Runner Slimline II Rack, SCS F5s, 255/80R17 ST Maxx , OME BP-51s, Dirt King UCAs, Metal Tech RR Lower Links
2016 Lexus IS300 F Sport- F-Sport Air Filter RR Racing tuner
|
|
Reply With Quote
|
09-30-2015, 09:13 AM
|
#9
|
|
Member
|
|
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
|
Member
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
Quote:
Originally Posted by stir_fry_boy
Lots of things can cause engine hesitation like injectors, spark plugs, clogged air filter, insufficient fuel pressure, try sea foam in the gas tank with premium fuel first as well as pulling a spark plug to make sure they are Denso/NGK OEM.
|
I tried Seafoam, and I've been putting premium in in since I got it. No dice so far. Haven't tried the spark plugs yet, but they'd all have to be bad at the same time to act like that. Still, it's on my list of replacement parts to get to.
|
|
Reply With Quote
|
09-30-2015, 09:16 AM
|
#10
|
|
Elite Member
|
|
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,494
|
|
Elite Member
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,494
|
Quote:
Originally Posted by kball
Since you don't say what year you have I'll guess it's a 01-02. I can't imagine a bad TPS causing you to go no where when hitting the gas unless you are fly by wire. My guess is, a bad TPS, bad thing is, if you are an 01-02 I don't think you can get just the TPS. I think you have to get the whole TB.
|
Agree with this. There is also the pedal sensor which other years don't have and can be changed on its own. I recommend OP spend some time with the 1996 to 2002 Toyota 4Runner OEM Repair and Wiring Manuals FSM and test all the components of the Throttle-by-wire system. The intermittent nature of the fault makes me think it is electrical. I don't know enough about the TbW system to suggest what components can cause a problem without setting a code.
This is all assuming he is '01-'02 which would be really nice to know.
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
|
|
Reply With Quote
|
09-30-2015, 11:57 AM
|
#11
|
|
Member
|
|
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
|
Member
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
It's an 02
|
|
Reply With Quote
|
09-30-2015, 08:54 PM
|
#12
|
|
Member
|
|
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
|
Member
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
Okay so with the responses so far I'll be replacing the spark plugs and fuel filter, maybe even the throttle body or, if possible, only the throttle position sensor.
Does anyone think it can be the fuel pump itself? Or corroded fuel lines? Theres a lot of rust underneath and it looks like part of the lines could be compromised.
|
|
Reply With Quote
|
09-30-2015, 08:57 PM
|
#13
|
|
Member
|
|
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
|
Member
Join Date: Jun 2012
Location: MO
Posts: 206
Real Name: Daddy
|
Quote:
Originally Posted by TheDurk
Agree with this. There is also the pedal sensor which other years don't have and can be changed on its own. I recommend OP spend some time with the 1996 to 2002 Toyota 4Runner OEM Repair and Wiring Manuals FSM and test all the components of the Throttle-by-wire system. The intermittent nature of the fault makes me think it is electrical. I don't know enough about the TbW system to suggest what components can cause a problem without setting a code.
This is all assuming he is '01-'02 which would be really nice to know.
|
Is that available in a PDF form or anything downloadable? I don't always have the best wifi connection in the shop, and I like to have this kind of thing pulled up.
|
|
Reply With Quote
|
09-30-2015, 09:18 PM
|
#14
|
|
Elite Member
|
|
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,494
|
|
Elite Member
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,494
|
Quote:
Originally Posted by TJM
Is that available in a PDF form or anything downloadable? I don't always have the best wifi connection in the shop, and I like to have this kind of thing pulled up.
|
It's out there, but I don't have a link. (I have a paper one for my year so I don't need it.) Hopefully, someone else can help you.
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
|
|
Reply With Quote
|
10-01-2015, 12:15 AM
|
#15
|
|
Member
|
|
Join Date: Mar 2015
Location: Orlando, FL
Age: 31
Posts: 423
Real Name: Dalton
|
|
Member
Join Date: Mar 2015
Location: Orlando, FL
Age: 31
Posts: 423
Real Name: Dalton
|
My .02:
I was playing with the Traction Control fuse one day in my 01, if you unplug it the truck will barely move. Wouldn't hurt to check that out.
__________________
2001 4Runner SR5 2WD on 35" BFG KM2
Bilstein 5100/Toytec Springs LC 9 wrap/LC shocks.
Its a wannabe 4WD.
|
|
Reply With Quote
|
Thread Tools |
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
|