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Re: V70 D5 Idle RPM
Volvo automobiles Volvo automobiles. (alt.autos.volvo)
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#1
 
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Re: V70 D5 Idle RPM -
02-20-2009
, 05:15 AM
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Hi I find my D5 having quite a high idle RPM as in *just above 1000RPM. This makes the geartronic to crawl at the trafiic lights. so what should be the idle speed, and, what could ( apart from a cold engine) be the cause. * I checked the ECG, seems OK, and there is no rought idle either, nor power loss. |
at 750 RPM which is the correct value.
Let it check at the dealer. They can hook the car to a diagnosis-
computer and find out what is wrong.
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Cheers |
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Marc |
#2
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Hi I find my D5 having quite a high idle RPM as in *just above 1000RPM. This makes the geartronic to crawl at the trafiic lights. so what should be the idle speed, and, what could ( apart from a cold engine) be the cause. * I checked the ECG, seems OK, and there is no rought idle either, nor power loss. Cheers Marc |
#3
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Hi I find my D5 having quite a high idle RPM as in just above 1000RPM. This makes the geartronic to crawl at the trafiic lights. so what should be the idle speed, and, what could ( apart from a cold engine) be the cause. I checked the ECG, seems OK, and there is no rought idle either, nor power loss. Cheers Marc |
The OP'ers car is a D5- therefore no IAC.
Tim
..
#4
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so now back to the crawling when idling. I'm not reaaly used to drive automatic so i have litlle to compare with. I know this is to some extend normal, and i dont mind keeping to foot on the brake, but as it is it crawls at 1 km an hour so i guess this is within specs. However is this something that can be adjusted or is the torque converter not regulated. |
Drive. Its input torque is propoprtional to the square of input speed. Its
output torque is input torque multiplied by whatever the torque ratio is at
stall - probably about 2. The torque being transmitted to the wheels is
multiplied further by the gearbox and final drive. If this is sufficient to
overcome the static rolling resistance, the car will creep.
Aside from keeping your foot on the brake, the only ways to stop creep are
either to reduce the idle speed or to select a higher gear. In practice, you
probably can't do either because the idle speed is probably set by the ECU
and the gearbox will probably start off in first even if you manually select
a higher gear.
--
Cheers,
Roger
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#5
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In an earlier contribution to this discussion, Marc Amsterdam <reply (AT) newsgroup (DOT) only> wrote: so now back to the crawling when idling. I'm not reaaly used to drive automatic so i have litlle to compare with. I know this is to some extend normal, and i dont mind keeping to foot on the brake, but as it is it crawls at 1 km an hour so i guess this is within specs. However is this something that can be adjusted or is the torque converter not regulated. The torque converter is running stalled when the car is stationary but in Drive. Its input torque is propoprtional to the square of input speed. Its output torque is input torque multiplied by whatever the torque ratio is at stall - probably about 2. The torque being transmitted to the wheels is multiplied further by the gearbox and final drive. If this is sufficient to overcome the static rolling resistance, the car will creep. Aside from keeping your foot on the brake, the only ways to stop creep are either to reduce the idle speed or to select a higher gear. In practice, you probably can't do either because the idle speed is probably set by the ECU and the gearbox will probably start off in first even if you manually select a higher gear. |
I've never driven anything with an automatic that wouldn't creep at idle
if you let up on the brake.
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