Issue when taking off from standstill - jerking/lurching - Toyota Yaris Forums

bung206 · 04-14-2013, 06:22 PM

Okay so I've inspected the live data stream, specifally engine speed, throttle position & fuel flow in CC/min.

When I step on the gas, the engine revs start to rise until they hit about 1200, then there is a sharp drop back down to 800 or so (while the car jerks, kind of like I dropped a gear and dumped the clutch in a M/T), after which point the car accelerates smoothly. During this time, I saw that the fuel flow rate and the throttle position do not change; they are on a constant upward curve (as one would expect).

Anyone got any more thoughts on what this may be?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Air Conditioner Noise & Leak?	Dawn Eshelman	DIY / Maintenance / Service	116	07-21-2015 01:22 PM
yaris voltage issue	yaris2010RS	DIY / Maintenance / Service	11	12-29-2012 04:20 PM
Water Pump issue, after taking in for Recall	GeneralDon7	General Yaris / Vitz Discussion	34	05-27-2012 08:04 PM
08 HB DRL Issue	BruceLee	Cosmetic Modifications (Exterior/Interior)	3	02-18-2012 10:59 PM
CONSUMER REPORTS : MARCH issue reviews '09 YARIS .	gid	General Yaris / Vitz Discussion	93	01-06-2009 04:10 AM

04-14-2013, 06:22 PM	#8
bung206 Drives: 2006 Yaris Join Date: Feb 2013 Location: New Zealand Posts: 12	Okay so I've inspected the live data stream, specifally engine speed, throttle position & fuel flow in CC/min. When I step on the gas, the engine revs start to rise until they hit about 1200, then there is a sharp drop back down to 800 or so (while the car jerks, kind of like I dropped a gear and dumped the clutch in a M/T), after which point the car accelerates smoothly. During this time, I saw that the fuel flow rate and the throttle position do not change; they are on a constant upward curve (as one would expect). Anyone got any more thoughts on what this may be?