2000 4runner RPM's wont go down
#1
2000 4Runner RPM's won't go down
I had some problems lately with my 4Runner and got very suspicious on every new thing I hear or feel...
Just noticed this today when driving on the highway above 50-60 miles per hour. When I take my foot off from the gas pedal RPM's stay above 2000 but when driving with lower speeds, every time when RPM's are above 2000 and I take my foot off, they go as low as 1000.
So my question is: is it normal that on the last gear RPM's stay at the same position without pressing on the gas pedal?
If not, what can cause this?
It is 2000 4Runner 3.4L engine SR5 everything stock - 145,000 miles
I had spark plugs, wires, ignition coils and catalytic converter changed about 2000 miles ago...
Just noticed this today when driving on the highway above 50-60 miles per hour. When I take my foot off from the gas pedal RPM's stay above 2000 but when driving with lower speeds, every time when RPM's are above 2000 and I take my foot off, they go as low as 1000.
So my question is: is it normal that on the last gear RPM's stay at the same position without pressing on the gas pedal?
If not, what can cause this?
It is 2000 4Runner 3.4L engine SR5 everything stock - 145,000 miles
I had spark plugs, wires, ignition coils and catalytic converter changed about 2000 miles ago...
Last edited by osin; 05-23-2009 at 05:27 PM.
#3
O2 sensors were changed about 20,000 miles ago. Also car was recently 3 times at dealer's shop for misfire problem and cat converter replacement, so I believe they would check the sensors too...
AC seems to work fine, didn't check the heat though...I will try that today...
any other ideas?
it only happens with higher speeds...
AC seems to work fine, didn't check the heat though...I will try that today...
any other ideas?
it only happens with higher speeds...
#6
Just a little update.
I did about 6 different trips today and RPM's were going down to about 1500, even when driving 80MPH.
On the last trip problem returned. When driving above 50 MPH (on the last gear) RPMs didn't go down until pressing the brake. They were going down slowly with decreasing the speed...
Does anyone else have an idea what can be wrong?
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#9
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I changed my TPS just for the hell of it a few months back. 50$ and 5min. It could be possible that the incidence is not occuring enough to actually flip the light, but just enough to begin driveability issues.
#10
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I was chasing this same problem over the last couple of months. My 4Runner would idle at 1500-1700 and would only go back to normal idle if I bliped the throttle to 4000.
After cleaning the throttle body and mass air flow sensor, my check engine light came on, indicating that my mass air flow sensor was bad. After replacing it, my engine idles at 750-1000.
I would start with trying to clean your MAF sensor. Be careful doing that, though, as you can damage it. I think that's what happened with mine.
After cleaning the throttle body and mass air flow sensor, my check engine light came on, indicating that my mass air flow sensor was bad. After replacing it, my engine idles at 750-1000.
I would start with trying to clean your MAF sensor. Be careful doing that, though, as you can damage it. I think that's what happened with mine.
#11
I'm sorry for not mentioning this before but I changed MAF sensor about 45000 miles ago (had code for this) and cleaned the throttle body about 10000 miles ago.
I've never seen TPS before. Is it possible to clean it like MAF sensor or it should be replaced?
I've never seen TPS before. Is it possible to clean it like MAF sensor or it should be replaced?
#14
and your point is ? MAFs need to be cleaned every 30,000. this is not the self cleaning hot wire model that newer cars have
#15
I was switching both (overdrive, ECT) and also AC on and off, but no change.
Today I had this problem first drive at the morning but later was all good, opposite to what was happening yesterday...
I disconnected the battery, installed new air filter, filled the tank with different gasoline than before and problem is still there.
Will try to clean MAF sensor at the end of the week and possibly will change the TPS, unless somebody else will chime in with different idea...
Thank you all for posting...
Last edited by osin; 05-25-2009 at 04:12 PM.
#16
#17
Just a little update for others who will find this thread in the future.
I've cleaned MAF sensor and throttle body but this didn't help...
Problem was coming back for couple of weeks and finally triggered the engine light - P0120 code => TPS - that is what Godzilla suggested
Sensor replaced and my 4Runner runs like new
Thanks guys for help...
I've cleaned MAF sensor and throttle body but this didn't help...
Problem was coming back for couple of weeks and finally triggered the engine light - P0120 code => TPS - that is what Godzilla suggested
Sensor replaced and my 4Runner runs like new
Thanks guys for help...
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I am Having the same problem, Just bought myself a 2000 T4R with 150,000 KM. Driving at highway speeds if I let off the gas the RPM is pegged at 1500 then as I start braking it follows the speed back down to Idle. Almost as If its trying to engine brake. I also notice it will down shift as I slow down.
I cleaned the MAF, TB, New mobile 1 ATF ( great stuff), Oil Change, Pulled the EFI fuse, Total reset of the ECU and still nothing. No codes have popped up yet.
Guessing TPS?
I cleaned the MAF, TB, New mobile 1 ATF ( great stuff), Oil Change, Pulled the EFI fuse, Total reset of the ECU and still nothing. No codes have popped up yet.
Guessing TPS?