throttle-body, and off-idle question - Toyota Yaris Forums

unadilla66 · 08-03-2015, 05:02 PM

'07 manual HB, 105k. The car is relatively new to me, so I cleaned the throttle-body and MAS, hoping to cure a slightly erratic idle. With no throttle, should the butterfly be completely closed? It was just slightly open- I could push it closed with my finger to seat against the lip, but it seemed like there was a spring or something holding it slightly open. Normal? Anyway, the cleaning didn't do much with the erratic idle, but it seems to be idling slightly higher now....

Maybe related, maybe not- I find the car does an annoying kind of rpm hunting when driving with just a slight throttle, for example when going down a long medium grade hill on the highway where its not steep enough to just take my foot off the gas, but I'm giving it very little throttle. Its like the computer keeps going back and forth between providing gas and not providing gas. Hard to explain, but I find it annoying (though my wife says she doesn't notice it...). Throttle position sensor issue?

08-03-2015, 05:02 PM	#1
unadilla66 Drives: '07 3d, '10 3d, '12 3d Join Date: Jun 2015 Location: ny Posts: 31	throttle-body, and off-idle question '07 manual HB, 105k. The car is relatively new to me, so I cleaned the throttle-body and MAS, hoping to cure a slightly erratic idle. With no throttle, should the butterfly be completely closed? It was just slightly open- I could push it closed with my finger to seat against the lip, but it seemed like there was a spring or something holding it slightly open. Normal? Anyway, the cleaning didn't do much with the erratic idle, but it seems to be idling slightly higher now.... Maybe related, maybe not- I find the car does an annoying kind of rpm hunting when driving with just a slight throttle, for example when going down a long medium grade hill on the highway where its not steep enough to just take my foot off the gas, but I'm giving it very little throttle. Its like the computer keeps going back and forth between providing gas and not providing gas. Hard to explain, but I find it annoying (though my wife says she doesn't notice it...). Throttle position sensor issue?