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Old 10-19-2020, 07:53 AM   #1
Drives: Toyota Yaris
Join Date: Jan 2015
Location: Australia
Posts: 3
Yaris stalling in very hot weather at low rpm

Our 2008 4sp automatic 1.5l Yaris sedan stalls intermittently or loses power at low rpm in very hot weather (>35C/100F). Car has 150k kms and has been doing it since around 80ks. Car is completely stock.

The most common set of circumstances is after car has a long period of idling or lots of stop/start driving or slowing down after a long period of highway driving. It starts again immediately with no issues. If temperature is less than 35C/100F then doesn't seem to be an issue.

No engine codes have been recorded. Fuel filter in the tank has been replaced recently and resulted in no change. Throttle body has been cleaned. Spark plugs replaced. Car uses E10 fuel.

To my inexperienced mind it seems like it may be a vapour lock although it does not appear to be related to amount of fuel in the tank.

Any help would be much appreciated!
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Old 10-19-2020, 07:00 PM   #2
Drives: 2010 yaris 3 door hatch
Join Date: Jun 2013
Location: Sheboygan Falls, Wi.
Posts: 361
Try cleaning the MAF sensor. It could be very dirty injectors or weak fuel pressure.
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Old 10-19-2020, 07:18 PM   #3
2ZR swap. DO IT! Ask how!
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Drives: 09 Meteoric Metallic HB
Join Date: Feb 2011
Location: West Michigan
Posts: 2,275
Please only start one thread per issue.
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Old 10-20-2020, 10:36 AM   #4
Drives: 2015Yaris, Son's car, 10 Prius
Join Date: May 2010
Location: Texas
Posts: 165
The Throttle body by the butterfly usually has a build up which would cause restriction when idling. Get some long cotton swabs and throttle body cleaner.
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Old 10-21-2020, 10:38 PM   #5
Drives: Toyota Vios
Join Date: Feb 2013
Location: MY
Posts: 43
i think it is quite common for Toyota old models to have low RPM (500-500rpm) at idle.

some say replace A/F (O2) sensor will resolve it, but soon after a while the problem comes back again
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