[Michigan_S60]

Welcome all! I just joined this board after my wife and I bought our first Volvo (back in July) - a 2001 S60 2.4T. Yep even though I am a BIG horsepower nut, I could not get over the significant around-the-town turbo lag of the T5...<P>At any rate, being a powertrain engineer I am very picky and can notice even the slightest powertrain issue.<P>So I was wondering if anyone else here has notice the "bobble/shuffle" followed by a torque bump/oscillation after quickly releasing the brakes after stopping.<P>Here is the scenario:<P>Come up to a stop light, brake normally, hold the brake pedal down, then quickly let go to move ahead. What I get is a b-o-i-n-g shudder feeling which feels like the engine rolling and oscillating after torquing up against its mounts while the brakes are applied. Of course the dealer could not find a thing (twice now). I poked around under the car while changing the oil and I could not see anything damaged or too obvious. In fact, everything looked very stout (I have some nice pics too). The bad news is I also found this on another S60 during our test drives.<P>On another note, I just got back from having the "rear control module reinitialized" which fixed the non functional: fuel gauge, elec. headrests, trunk release, rear door locks, central door locks, and intermittently the sunroof and garage door opener! Again no problem found, but the reinit worked. Very reassuring! <IMG SRC="http://www.swedespeed.com/ubb/smile.gif"><P>Has anyone else noticed these issues on their car? Just curious. <P>Sorry for the long winded note!<P>

 

[S.R.]

I am not sure if you know this, but the new Volvo Aisin Warner automatic transmissions/gearboxes have something called "Neutral Grade Control". This system basically 'disengages' the transmission output to drive-shaft when the car comes to a stop to prevent wear and tear on the gearbox internals and also prevents stress on the engine itself. For example, if you are on a hill pointing upwards, the car will have a tendency to roll back slightly if you take your foot off of the brake pedal. The instant the drive-by-wire system detects a throttle input, the car moves and engages to normal operating conditions. I have heard of this similar concern before. This could be what you are feeling as Volvo technicians have told me that this is normal as well.<P>-Drew

 

[Jim DeSalvio]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Michigan_S60:<BR><B>Welcome all! I just joined this board after my wife and I bought our first Volvo (back in July) - a 2001 S60 2.4T. Yep even though I am a BIG horsepower nut, I could not get over the significant around-the-town turbo lag of the T5...<P>At any rate, being a powertrain engineer I am very picky and can notice even the slightest powertrain issue.<P>So I was wondering if anyone else here has notice the "bobble/shuffle" followed by a torque bump/oscillation after quickly releasing the brakes after stopping.<P>Here is the scenario:<P>Come up to a stop light, brake normally, hold the brake pedal down, then quickly let go to move ahead. What I get is a b-o-i-n-g shudder feeling which feels like the engine rolling and oscillating after torquing up against its mounts while the brakes are applied. Of course the dealer could not find a thing (twice now). I poked around under the car while changing the oil and I could not see anything damaged or too obvious. In fact, everything looked very stout (I have some nice pics too). The bad news is I also found this on another S60 during our test drives.<P>On another note, I just got back from having the "rear control module reinitialized" which fixed the non functional: fuel gauge, elec. headrests, trunk release, rear door locks, central door locks, and intermittently the sunroof and garage door opener! Again no problem found, but the reinit worked. Very reassuring! <IMG SRC="http://www.swedespeed.com/ubb/smile.gif"><P>Has anyone else noticed these issues on their car? Just curious. <P>Sorry for the long winded note!<BR></B><HR></BLOCKQUOTE><P>At first, I found this feature to be annoying, but with additional miles on the car (now about 6500), the jerkiness has smoothed out and it is hardly noticable. I believe what you describe is normal operation and the owners manual does describe this transmission operation.<P>I also felt that the torque converter would engage rather harshly at first (espically when coasting), but that also has resolved with more miles on the vehicle.<P>Hope this settles some of your concerns and enjoy your new ride!<P>Regards,<P>Jim (2001 S60 2.4T)<P>