06 cts-v rpms stay when shifting
10-23-2013, 02:28 PM
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06 cts-v rpms stay when shifting Had a little time while waiting in the doctors office so figured id ask this question. The problem just started today on my 06 cts-v with 85k miles, I just bought it a week and a half ago and never owned an ls vehicle prior to this one so im pretty wet behind the ears on these motors but not necessarily motors in general.
When driving the clutch and throttle work as they should but when you press the clutch it holds the rpms where they are even with my foot of the throttle for a couple of seconds then the rpms drop like they should to shift. I've looked up similar situations on different vehicles and seen anywhere from a vacuum leak, to clutch switch, and dirty throttle body. Just looking for where to start on this. Thanks in advance for any and all help/info
When driving the clutch and throttle work as they should but when you press the clutch it holds the rpms where they are even with my foot of the throttle for a couple of seconds then the rpms drop like they should to shift. I've looked up similar situations on different vehicles and seen anywhere from a vacuum leak, to clutch switch, and dirty throttle body. Just looking for where to start on this. Thanks in advance for any and all help/info
10-23-2013, 02:50 PM
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I have zero experience with this, but remember reading somewhere in the past couple years that someone had the same problem. Many V owners suggested the throttle position sensor or pedal position sensor. Maybe do a search in this forum for those words, but I'm not sure I saw it here.
10-23-2013, 06:29 PM
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Cruise control for some reason has been hit or miss. It works sometimes and sometimes it doesn't. That would make sense with it affecting that issue as well
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10-23-2013, 07:57 PM
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10-24-2013, 12:47 PM
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Electronic throttle control relearn didn't work. Still wondering why im not throwing a code on it yet. Might see if I have a code pending or something since there's no cel yet
10-24-2013, 02:42 PM
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What kind of air box and filter, stock, cold air? Have you checked to see if that mass air flow sensor is dirty? Get a can of CRC mass air flow cleaner and clean it.
Did you check for vacuum leaks? With the car in neutral what happens when you rev the throttle, does it hang then or drop like normal? Test different speeds, cruising 40-50 let off the gas and press in the clutch, do the same at a slower speed like 10-15, see what that does.
Are you sure the car has never been tuned or messed with?
Did you check for vacuum leaks? With the car in neutral what happens when you rev the throttle, does it hang then or drop like normal? Test different speeds, cruising 40-50 let off the gas and press in the clutch, do the same at a slower speed like 10-15, see what that does.
Are you sure the car has never been tuned or messed with?
10-24-2013, 04:44 PM
#16
FWIW, my 06 does this too...had it 3 years, done it since I got it. I replaced the clutch sensor a while back for other reasons which resulted in no change on the throttle running. I'm pretty convinced mine is the factory clutch/flywheel combo or perhaps a very random 'perfect storm' of factors causing the computer to get confused. My car most-often sees this when I start to accelerate and then have to jump off the gas unexpectedly around torque-peak (think busting through rush-hour traffic on the interstate) or when I'm heel-toe'ing down to a redlight on an offramp which is why I'm leaning towards inertia of the 3 ton flywheel as the culprit.
10-25-2013, 09:41 AM
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What kind of air box and filter, stock, cold air? Have you checked to see if that mass air flow sensor is dirty? Get a can of CRC mass air flow cleaner and clean it.
Did you check for vacuum leaks? With the car in neutral what happens when you rev the throttle, does it hang then or drop like normal? Test different speeds, cruising 40-50 let off the gas and press in the clutch, do the same at a slower speed like 10-15, see what that does.
Are you sure the car has never been tuned or messed with?
Did you check for vacuum leaks? With the car in neutral what happens when you rev the throttle, does it hang then or drop like normal? Test different speeds, cruising 40-50 let off the gas and press in the clutch, do the same at a slower speed like 10-15, see what that does.
Are you sure the car has never been tuned or messed with?
10-25-2013, 11:43 AM
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I'm not sure if your issue is more serious than what I consider "normal", but I have noticed a lot of the newer LS cars I have driven with a 6 speed do hold the revs for a bit between shifts. I had to get used to this with the V as I often go 100% throttle and then want to skip gears and go to low throttle when I get up to speed. The revs hold for a second or so before dropping like you would expect.
10-26-2013, 09:33 PM
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I remember looking into this a while back and the results that kept popping up was that this "rev-hanging" is something that is programmed into the ecu from the factory in drive-by-wire vehicles that prevents the throttle from dropping immediately to reduce emissions. The only way to get rid of it is to have it tuned out. Now if you still have the stock-dual mass clutch, the car will rev-hang even longer for "ease" of shifting.
10-27-2013, 10:41 PM
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I remember looking into this a while back and the results that kept popping up was that this "rev-hanging" is something that is programmed into the ecu from the factory in drive-by-wire vehicles that prevents the throttle from dropping immediately to reduce emissions. The only way to get rid of it is to have it tuned out. Now if you still have the stock-dual mass clutch, the car will rev-hang even longer for "ease" of shifting.