Rev Issue On Idle - Toyota Yaris Forums

SePtRa · 07-25-2013, 04:40 AM

Hi all...

After driving me mad

I've come to you for some help....

So i have a 2007 1.0 Yaris Sol...

And for some time there is a issue... When i put the car in neutral and lower my speed the revs drop too low and then the car has to accelerate by himself to recover this happens 2 or 3 times in a row....

Today as i'm diving home the this happened but some I've felt new symptoms too.. when i am accelerating the car seems to pause for a second and the go...

I've been to Toyota but nothing has been done...

Thanks in advance!!!!

CTScott · 07-25-2013, 08:39 AM

Is the A/C on when this happens?

SePtRa · 07-25-2013, 12:47 PM

No A/C Off... I Also forgot to say that doesn't happen every day.

I have a Mini VCI Cable with Techstream. I will try to check for error codes.

CTScott · 07-25-2013, 02:07 PM

Quote:

Originally Posted by SePtRa

No A/C Off... I Also forgot to say that doesn't happen every day.

I have a Mini VCI Cable with Techstream. I will try to check for error codes.

Also, watch the data from the MAP sensor on your 1.0L with the techstream while it is occurring.

SePtRa · 07-26-2013, 04:38 AM

So i went back to the car yesterday... No codes have been found...

I also watched the Map sensors as you said CTScott the values are:
~100 Kpa when its stopped.
As soon as i started the car i went down to around 30 kpa...

Unfortunately the issue did not occur when i was on the techstream...

ezhacker1 · 07-26-2013, 05:24 AM

Could the car be running too lean due to a vacuum leak. It will cause rough idle and see the RPM fluctuation, and hesitation during acceleration.

SePtRa · 07-29-2013, 11:42 AM

New development...

Now when I start the car after a night on the garage it makes a Buzzing noise... Its loud enough to listen inside the car with everything closed..

CTScott · 07-29-2013, 12:10 PM

Quote:

Originally Posted by SePtRa

New development...

Now when I start the car after a night on the garage it makes a Buzzing noise... Its loud enough to listen inside the car with everything closed..

That may be the fuel pump. The service manual for your engine seems to point to most issues, like what you are experiencing, being caused by the fuel pump.

07-25-2013, 04:40 AM	#1
SePtRa View User's Garage Drives: 2000 Land Cruiser & 2007 Yaris Join Date: Nov 2012 Location: Porto Portugal Posts: 7	Rev Issue On Idle Hi all... After driving me mad I've come to you for some help.... So i have a 2007 1.0 Yaris Sol... And for some time there is a issue... When i put the car in neutral and lower my speed the revs drop too low and then the car has to accelerate by himself to recover this happens 2 or 3 times in a row.... Today as i'm diving home the this happened but some I've felt new symptoms too.. when i am accelerating the car seems to pause for a second and the go... I've been to Toyota but nothing has been done... Thanks in advance!!!!

07-25-2013, 08:39 AM	#2
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	Is the A/C on when this happens? __________________

07-26-2013, 05:24 AM	#6
ezhacker1 Drives: Decepticon - Ravage Join Date: Nov 2008 Location: San Francisco Posts: 1,462	Could the car be running too lean due to a vacuum leak. It will cause rough idle and see the RPM fluctuation, and hesitation during acceleration. __________________ Check out my Build thread: http://www.yarisworld.com/forums/showthread.php?t=52274

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07-25-2013, 12:47 PM	#3
SePtRa View User's Garage Drives: 2000 Land Cruiser & 2007 Yaris Join Date: Nov 2012 Location: Porto Portugal Posts: 7	No A/C Off... I Also forgot to say that doesn't happen every day. I have a Mini VCI Cable with Techstream. I will try to check for error codes.

07-26-2013, 04:38 AM	#5
SePtRa View User's Garage Drives: 2000 Land Cruiser & 2007 Yaris Join Date: Nov 2012 Location: Porto Portugal Posts: 7	So i went back to the car yesterday... No codes have been found... I also watched the Map sensors as you said CTScott the values are: ~100 Kpa when its stopped. As soon as i started the car i went down to around 30 kpa... Unfortunately the issue did not occur when i was on the techstream...

07-29-2013, 11:42 AM	#7
SePtRa View User's Garage Drives: 2000 Land Cruiser & 2007 Yaris Join Date: Nov 2012 Location: Porto Portugal Posts: 7	New development... Now when I start the car after a night on the garage it makes a Buzzing noise... Its loud enough to listen inside the car with everything closed..