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Old 06-30-2019, 08:14 PM #1
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No power when pushing pedal down??

Hi all. 2001 w/ 240,000.

I make the drive up to the Bay Area from Southern CA usually once a month. I noticed recently on these trips that after I let off the gas and then gas it again on freeway there will be no power whatsoever for about three seconds and then you can feel the power kick in and engine make noise. It's concerning given I will drive up/down in the early morning hours (2AM etc) and don't want to get stranded.

I have not been able to replicate this problem just driving around freeways here, and it only seems to happen on long trips up and down from there. Does it with both AC on and off. Most recently I felt it when I was in first gear from a stop. No power, happened three times that day and that was it. Mechanic has no idea, said let it get worse.

Any ideas? Other than this, running beautifully!
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Old 06-30-2019, 09:52 PM #2
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There are different things that can loss of power pull the codes and start from there. But if it's Throttle position sensor. I Just saw some one who found one that worked for 65.00. A factory one will cost about 1300.00 2001 and 2002 have a 4 wire TPS which is different from older models.

I found this info.

For anybody looking for TPS 89452-35030 4 pin, you can get them at Discount Auto Parts Online -- PartsGeek.com - Domestic & Import Car Parts Warehouse they are about $ 65.00 OEM made by Aisan in Japan.
I had an iddle problem with my 2002 4Runner, Installed this part and now the iddle is just perfect:





bathbaby:

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Old 06-30-2019, 10:05 PM #3
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Write up: 01-02 T4R Throttle Position Sensor Info

Found it. So for $65 I can replace it and not pay the $1300 that I'm reading about? If so how difficult is it to replace?
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Old 06-30-2019, 10:14 PM #4
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Tps is easy to get to the where the throttle cables come into it's on the fire wall side of the Throttle body. There is a plug and 2 screws there is some adjustment on the sensor you can do a little trial and error until it runs smooth I'm not sure of the exact procedure. I would try to determine the try cause of of power loss.
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Old 06-30-2019, 11:02 PM #5
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If it is a throttle position sensor search the threads I thought I read something about taking out of OD in the Transmission allows you to drive it also something about with the engine off pushing the throttle up and down a few times maybe able to clear the bad spot temporarily. I have not had this problem so good luck
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Old 07-01-2019, 12:35 PM #6
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Almost sounds like a dead spot in the TPS... that's an odd one. Double check the wiring to the throttle body and all grounds are clean and secure. Since it's 100% drive by wire, it's either a wiring or sensor issue.
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Old 07-01-2019, 02:45 PM #7
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check the accelerator pedal position sensor also..full of crud moisture etc
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Old 07-03-2019, 01:49 AM #8
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Quote:
Originally Posted by SaulG View Post
check the accelerator pedal position sensor also..full of crud moisture etc
Is this simple to do?
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Old 07-11-2019, 09:39 PM #9
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No power when pushing pedal down??



Hey all. My mechanic found (and ordered) the “hard to find” TPS that ends in ‘30’ NOT ‘20’. I showed up there today and we verified it is indeed a four pin sensor

My reason for posting is - there appears to be two sensors in the photo (circled in red). He said the one on the left does NOT come off unless you replace the whole throttle body, but the one on the right he CAN replace (with the four prong).

Which is the one that usually needs to be replaced? I didn’t know there was two, so I told him to hold off until I find more info. Debating on having him replace the whole throttle body since the sensor that could be out might be the non-removable one on the left???


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Old 07-12-2019, 09:58 AM #10
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anyone?


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Old 07-12-2019, 11:15 AM #11
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I think he might be right about having to replace the TB
I have a 1999 and you can easily remove the TPS, no problem, but I think the 01 and 02 TB is a whole different animal due to the drive by wire.
Maybe an 01 or 02 owner can chime in?



Now, those do also sound like fuel pressure issues. I had the same basic symptoms at 2 different times (bad fuel pressure regulator and bad fuel pump)
With the FPS, the RPMs would cut out while driving and often come close to stalling, and then regain by itself. This was random, but replicatable by flooring it.
With the fuel pump, it would often start hard stumble and would not do ANYTHING even if I had the gas pedal floored. It was a weird feeling; you'd think that the RPMs would raise, but nothing happened. This would last for a couple minutes until the pressure rose. I just kept a can of starter fluid, just in case. Other than that, it drove great. Plenty of passing power, good MPGs, no stalling.
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Old 07-13-2019, 02:04 PM #12
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if you have the right part in hand it should be easy to match up but. From the picture what I can see it's the one on the right and on the car it's the once closest to the firewall. I would try and look back to earlier threads someone replaced the TPS and said it worked the part in the picture is pretty expensive. I would try and use the sensor you have if the parts look the same and see what happens.
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