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11-13-2018, 01:23 PM | #1 |
Drives: No longer own a yaris :( Join Date: Mar 2012
Location: Ashland, VA
Posts: 680
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Rev Hang revisisted
Hey Everyone, I have done lots of searching on rev hang, including on this forum and have yet to find an easy fix. I've emailed the guy from Qrevs who will build a unit that can fix this, but it is a bit cost-prohibitive at 290$.
From the posts I've read people have tried throttle controllers but I haven't seen any convincing evidence that this resolves rev-hang. I've also seen people switching to cable throttle bodies, but having to use standalone ecu. At that point why not use the standalone ecu to control the dbw? One thing I have not seen posted is that when the AC is turned on in my 2008 yaris the rev hang seems to completely disappear. Does anyone know if turning on the AC changes anything with the ecu or is it just the additional load that is causing the revs to drop faster? If there is a change being made to the ECU I'm wondering if there would be a way to send that same signal to the ECU without actually turning on the AC. If this is possible you could essentially turn off rev-hang without applying the load of the AC that would reduce power/fuel economy. If there are any threads on that specific theory please let me know, I couldn't find anything. |
11-14-2018, 08:38 PM | #2 |
Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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have you performed the throttle learn procedure? have you tried taking your foot off the accelerator before pushing the clutch pedal? i've only had this happen a few times when i first purchased my car, but i found these things really solved the issue and it has not happened in years. in the case of the a/c, it's probably the extra resistance on the belt bogging the belt enough that the rpm drop is assisted...
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11-15-2018, 08:14 AM | #3 | |
Drives: No longer own a yaris :( Join Date: Mar 2012
Location: Ashland, VA
Posts: 680
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Quote:
What throttle learning procedure do you mean? I've had the battery unplugged dozens of times and have experienced the ecu learning process. Last edited by Leegamer; 11-15-2018 at 08:30 AM. |
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12-10-2018, 07:24 PM | #4 |
Drives: Yaris 5 speed Join Date: Feb 2016
Location: NY
Posts: 37
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To reduce Rev hang, I haven't done this on Yaris but did it in BMW.
Find the intake hose that feeds the ICV then reduce the size to it and you will drop rev like a rock. |
12-10-2018, 09:37 PM | #5 |
Drives: 2007 2-door hatchback Join Date: Jul 2016
Location: USAnotCA
Posts: 750
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I know the shop manual has a list of abbreviations, but what and where is this ICV?
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12-11-2018, 08:36 AM | #6 | |
Drives: No longer own a yaris :( Join Date: Mar 2012
Location: Ashland, VA
Posts: 680
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Quote:
Hey, it's worth a shot! Will try it next time I change my oil
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