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 Rpm drop fast after letting off throttle pedal

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SUStoyotaviosuser
post Jun 17 2019, 03:18 PM, updated 5y ago

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My car is 2011 toyota vios with 1NZ-FE mated to 4-speed AT.

Recently I notice that when the car is speeding up from 15km/h to 60km/h while the gear is at the point of time in 2nd or 3rd position, the moment I let off the throttle pedal, RPM needle will drop fast from 2000+ RPM to around 1000 RPM then surge a bit up to around 1200 RPM. I can hear there is a minor shock noise from the front and feeling a little bit of jerk.

While the gear is in 4th gear, either lock up or not, letting off the throttle pedal, RPM will just reduce slowly which I feel this is normal.

What are the possibilities of the problem?
SheepGeeks
post Jun 17 2019, 03:28 PM

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Gearbox oil got check?
SUStoyotaviosuser
post Jun 17 2019, 03:38 PM

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QUOTE(SheepGeeks @ Jun 17 2019, 03:28 PM)
Gearbox oil got check?
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yes, it is still at optimal level. Replacement is not necessary under normal condition as Toyota is using life time ATF WS
set
post Jun 17 2019, 03:45 PM

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QUOTE(toyotaviosuser @ Jun 17 2019, 03:38 PM)
yes, it is still at optimal level. Replacement is not necessary under normal condition as Toyota is using life time ATF WS
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it doesn't last a life time
y3ivan
post Jun 17 2019, 03:49 PM

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Likely to do with the ECU, the car is changing the gears in between. I don't think it's a major problem but if it's making you annoyed then can ask the SC to check the tuning
SUStoyotaviosuser
post Jun 17 2019, 03:56 PM

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QUOTE(set @ Jun 17 2019, 03:45 PM)
it doesn't last a life time
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what is the replace interval? so far i heard to change at 100k km or 10 year whichever hit first
Zot
post Jun 17 2019, 04:04 PM

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Was it not like it used to be or you accelerate differently that before?

When accelerate fast, the gear will not quickly shift higher gear because the car need more torque from engine. So naturally, if you let go the gas pedal while still in low gear, the speed will drop fast because the low gear is dragging the speed down.

If the gear is not shifting like when you drive normally, then get it check in workshop. Maybe the shifting mechanism is having problem.
MR_alien
post Jun 17 2019, 04:40 PM

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QUOTE(toyotaviosuser @ Jun 17 2019, 03:38 PM)
yes, it is still at optimal level. Replacement is not necessary under normal condition as Toyota is using life time ATF WS
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yet another who believe in that lifetime oil BS

i think we already found the cause of the problem
and i'm also pretty sure the gearbox already suffered some heavy damage due to no maintenance at all
fireballs
post Jun 17 2019, 05:27 PM

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tb cleaned?
set
post Jun 17 2019, 05:48 PM

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QUOTE(toyotaviosuser @ Jun 17 2019, 03:56 PM)
what is the replace interval? so far i heard to change at 100k km or 10 year whichever hit first
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every 40k to be safe, that's what I do
kyxxx
post Jun 17 2019, 05:49 PM

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any problem if i drove 6000+rpm while naik bukit at 2nd gear? (for like few seconds)

standard engine, no modification

bo093
post Jun 17 2019, 07:51 PM

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sound like late engagement.
Thrust
post Jun 18 2019, 03:09 AM

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get the gearbox oil changed and then report here again
SUStoyotaviosuser
post Jun 18 2019, 09:33 AM

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QUOTE(Zot @ Jun 17 2019, 04:04 PM)
Was it not like it used to be or you accelerate differently that before?

When accelerate fast, the gear will not quickly shift higher gear because the car need more torque from engine. So naturally, if you let go the gas pedal while still in low gear, the speed will drop fast because the low gear is dragging the speed down.

If the gear is not shifting like when you drive normally, then get it check in workshop. Maybe the shifting mechanism is having problem.
*
just an usual acceleration, but previously i didn't go to take note on the RPM fluctuation.


QUOTE(MR_alien @ Jun 17 2019, 04:40 PM)
yet another who believe in that lifetime oil BS

i think we already found the cause of the problem
and i'm also pretty sure the gearbox already suffered some heavy damage due to no maintenance at all
*
Do We need to change the Toyota Lifetime ATF WS 08886-02305? this guy changed his ATF fluid at 80k km, but the old fluid look good and not burned. I checked mine, which clocking at 55k km, still fresh.


QUOTE(fireballs @ Jun 17 2019, 05:27 PM)
tb cleaned?
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TB, MAF, injectors all cleaned and intake filter, spark plugs, o2 sensor all changed.

QUOTE(set @ Jun 17 2019, 05:48 PM)
every 40k to be safe, that's what I do
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sure or not, it is ATF WS, dont need to replace so regularly
popopi
post Jun 18 2019, 09:41 AM

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I have something like this as well starting 160k service...
Mechanic found that my oil is dark... not burn... but having dark matter.. maybe metal powder of some sort...

Will do the ATF flush next service...

my issue is sudden lockup feel from lower gear.. like a burst of acceleration.... and my engine start to vibrate weirdly during idle... so MAP, TB those also need to clean?
MR_alien
post Jun 18 2019, 09:46 AM

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QUOTE(toyotaviosuser @ Jun 18 2019, 09:33 AM)
Do We need to change the Toyota Lifetime ATF WS 08886-02305?   this guy changed his ATF fluid at 80k km, but the old fluid look good and not burned. I checked mine, which clocking at 55k km, still fresh.
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don't look at the oil's condition
just change it
don't ever believe at those lifetime oil BS
there is no such thing as lifetime oil inside a box filled with moving parts

if u change your engine oil every 10k regardless if it's dirty or not
what makes u think your gearbox oil last a lifetime?
both are oil, it's not like gearbox oil is extracted from mars that is special laugh.gif

This post has been edited by MR_alien: Jun 18 2019, 09:47 AM
Zot
post Jun 18 2019, 09:50 AM

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QUOTE(toyotaviosuser @ Jun 18 2019, 09:33 AM)

just an usual acceleration, but previously i didn't go to take note on the RPM fluctuation.

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I don't mean that it will fluctuate. It seems that the gear is not shifting fast enough. The gear shift but at much later stage thus rpm get higher that normal at shifting point. Well, make sure you are not in overdrive mode laugh.gif

Here is what I copy and paste from a website:

Delay as in slipping or delay as in staying in the lower gear longer than normal?

In the first instance it is an internal problem and your transmission will need surgery . You may have too low a fluid level due to a leak and if that is not taken care of sooner rather than later your transmission will be toast .

In the second instance it could be a sensor. Your transmission is told when to shift based on inputs from various sensors . The two most important sensors are the VSS ( Vehicle Speed Sensor) and the TPS ( Throttle position Sensor) .

A good transmission shop will nail the issue . You may have a code that is not illuminating the MIL but could be stored in the PCM. You will need a scanner with data stream .

set
post Jun 18 2019, 09:56 AM

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QUOTE(toyotaviosuser @ Jun 18 2019, 09:33 AM)
just an usual acceleration, but previously i didn't go to take note on the RPM fluctuation.
Do We need to change the Toyota Lifetime ATF WS 08886-02305?  this guy changed his ATF fluid at 80k km, but the old fluid look good and not burned. I checked mine, which clocking at 55k km, still fresh.
TB, MAF, injectors all cleaned and intake filter, spark plugs, o2 sensor all changed.
sure or not, it is ATF WS, dont need to replace so regularly
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when I changed mine it already turned blackish, I replaced mine with motul ATF VI
netmatrix
post Jun 18 2019, 02:08 PM

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Clean throttle body & maf sensor sensor first. See if it solves your problem

 

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