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Old 05-06-2021, 05:59 PM #1
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Temporary, intermittent loss of power/hesitation

2002, SR5, 4WD, 170,000 miles

While driving, or starting from a stop, my 4Runner will lose power. Itís as if I took my foot off the accelerator. The engine doesn't die, it's just that the RPMs drop to idle and there is no response to the accelerator pedal. It doesnít matter if move the pedal, floor it or do anything else. The power just cuts out. Within 1 to 3 seconds, it will regain power. However Ė and I think this is interesting Ė the power doesnít come back with the power equivalent to the pedal position. It always ramps up slowly as if Iím starting slowly from a stop. In other words, if I have the pedal floored, when the power returns, it doesnít jump to full throttle. It slowly builds back up to whatever position I have the pedal in.

The problem comes and goes. It will last for a few days, then be gone for weeks.

If it was the throttle position sensor, would the throttle slowly build up like it does or would it suddenly return to whatever position the pedal is in? Could it be the ECM?

I originally had a long crank issue that turned out to be a vacuum leak, but in the process, I did A LOT of work. All of this has been done

- Checked and cleaned all grounds in the engine compartment
- Replaced plugs
- Replaced plug wires
- Replaced battery
- Replaced fuel filter
- Replaced air filter
- Replaced PCV valve
- Replaced fuel pump and pump screen
- Replaced front (AF) and rear O2 sensors
- Replaced Fuel Pressure Regulator
- Refurbished original OEM fuel injectors
- Cleaned MAF sensor
- Cleaned throttle body
- Disconnected battery to clear memory
- Smoke tested for vacuum leaks Ė replaced hose clamps and vacuum plugs
- Ohm tested Throttle Control Motor, Throttle Position Sensor and Accelerator Pedal Position Sensor Ė all 3 passed (the 2002 doesnít have an Idle Air Control Valve)
- No check engine light and no stored codes
- Ran through 2 cans of seafoam
- Replaced every fuse related to the ECU or fuel injection
- Took it to mechanic twice and he couldn't find anything
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Old 05-06-2021, 11:28 PM #2
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geez that's sounding a lot like a clutch problem i had with my pickup, but it's a manual and i see you've got a 2002 so that cause won't port over exactly. does your auto have a speed sensor on the transmission, and it could possibly be fouled? sorry for not being very familiar with that transmission. is this among those you resistance-tested? there's one on the tcase too?
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Old 05-07-2021, 12:24 AM #3
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This sounds like when my overactive VSC/TRAC system kicks on. Do you ever notice the VSC/TRAC lights coming in during this?

You could test your wheel speed sensors, check the for damage/gear oil on them, and make sure they're proper seated (not lifting up from rust). You could also try disabling the VSC/TRAC system to see if still happens to rule this. I don't know how to do it, but the Andy Mod deals with this that.
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Old 05-07-2021, 09:22 AM #4
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Have you looked at live data of your throttle position sensor while slowly applying the throttle? There might be a dead spot in the sensor that you won't pick up with a resistance check.
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Old 05-07-2021, 10:36 AM #5
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What is your Fuel Trims ST/LT, and what is the MAF temp and flow readings. I'd probably throw a new MAF at it if you can't pull live data.
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Old 05-10-2021, 11:26 PM #6
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I would look into a clogged cat a Vac gauge that reads low is a easy check..
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Old 08-11-2021, 04:03 PM #7
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I haven't had the problem for three months, but it came back today. It was worse than any previous events - the vehicle lost power, but this time it didn't come back and had to pull over to side of the road. The good news is, I finally got a trouble code:

P1126
Raw code: 1126
ECU: 10
Status: Confirmed
OBDII: Throttle Position (Narrow Range) Sensor Circuit Malfunction
Toyota: Magnetic Clutch Circuit Malfunction

Any recommendations on diagnostics?
I've read the TPS on my 2002 is not replaceable and the entire throttle body would need to be replaced. Any thoughts on that?
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Old 08-11-2021, 04:12 PM #8
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Based on post #25 in this thread, looks like replacing the throttle body is the way to go.

Throttle Position Sensor.....?
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Old 08-21-2021, 06:02 PM #9
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I installed a new throttle body today. If there are any issues Iíll be sure to post. No news is good news.

A note about replacing the TB: when I first started the engine, there was no throttle response for about half the travel of the accelerator pedal. I let the engine run for about 20 minutes and by then I suppose the computer figured out what had just happened and then there were no issues. I also replaced the TB gasket and torqued the two bolts and two nuts to factory specs since vacuum leaks had been giving me fits. Wanted to make sure Iíd have no more of those.
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Old 08-23-2021, 01:12 AM #10
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Quote:
Originally Posted by gruenegenes View Post
I installed a new throttle body today. If there are any issues I’ll be sure to post. No news is good news.

A note about replacing the TB: when I first started the engine, there was no throttle response for about half the travel of the accelerator pedal. I let the engine run for about 20 minutes and by then I suppose the computer figured out what had just happened and then there were no issues. I also replaced the TB gasket and torqued the two bolts and two nuts to factory specs since vacuum leaks had been giving me fits. Wanted to make sure I’d have no more of those.
Sorry you had to buy a new one. I used to sell used throttle bodies off 01-02's as the new price is quite expensive for a Toyota part. I think this should solve your issues. I also had phantom issues which the TPS was to blame, it will start to fail but not bad enough to throw a code and cause all sort of havoc.
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Old 08-23-2021, 11:39 PM #11
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mine has been doing the same thing for years, usually just when its hot out. this year has been especially bad though.I usually just tolerate it.

so the conses is replace the whole throttle body assembly?
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Old 08-24-2021, 08:13 AM #12
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Quote:
Originally Posted by jinxed13 View Post
mine has been doing the same thing for years, usually just when its hot out. this year has been especially bad though.I usually just tolerate it.

so the conses is replace the whole throttle body assembly?
Itís my understanding that for the 01 and 02, the Throttle Position Sensor cannot be replaced separately from the throttle body. Iíve read of some folks who have done it, but you have to find a 4 pin TPS and then calibrate it with another sensor on the TB, but many advised against it. Good luck! Such a frustrating problem.
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Old 09-15-2021, 08:34 PM #13
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update for anyone following. i replaced the tps with the 4 pin sensor from parts geek. it idled high for a few starts and then learned the new part. no more surging or hesitation.
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Old 09-18-2021, 11:20 AM #14
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The car is running fine, but it threw this code yesterday

P1126
Raw code: 1126
ECU: 10
Status: Confirmed
OBDII: Throttle Position (Narrow Range) Sensor Circuit Malfunction
Toyota: Magnetic Clutch Circuit Malfunction

I think the only things left to replace are the ECU and coolant temp sensor. Aside from those, I suppose it could be a short somewhere.
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