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Will Adams
DieHard
WA
Soarer GT-T L (My 4th Soarer)

Posts: 874
Reg: 02-2006

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Monday, May 28, 2007 - 09:13 pm, by:  Will Adams (Draco) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Most of the time when I am driving (regardless of whether the engine has fully warmed up or not), I sometimes get a weird thing happen with my revs. I will be driving along and say the car is in 3rd. I take my foot off the accelerator, or ease up on the accelerator to cruise, and notice that my revs drop and then pick up quickly. You can hear it through the exhaust note. It's like

hmmmmmmmmm mm mmmmmmmmm

I have only noticed it when easing up on the accelerator or stepping off it altogether when it does it. Otherwise normal cruising (after it's done this is fine). Of course if I accelerate and later on ease up it does the same thing.
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8

Posts: 7933
Reg: 11-2004

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Tuesday, May 29, 2007 - 12:50 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

What revs does it drop to before this happens?

I had noticed a slight blip around 1600 RPM, Cihan pointed out that it is the ECU switching the engine back "on" after having it "off" to save fuel when slowing down.
Brian Timms
TryHard
New South Wales
TT Soarer Goodness.

Posts: 413
Reg: 12-2006

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Tuesday, May 29, 2007 - 07:55 am, by:  Brian Timms (Turbo_brian) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

When getting off the gas, the ECU shuts the fuel injectors down as an econemy feature, but as soon as it senses the accelerator applied, it fires the injectors back up, so you will get a short rumble, which will dull in volume when the injectors shut off, then when you get back on the juice it will rumble up a little bit again.

As Pete said, it's a fuel saving configuration.

B.
Will Adams
DieHard
WA
Soarer GT-T L (My 4th Soarer)

Posts: 875
Reg: 02-2006

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Tuesday, May 29, 2007 - 10:55 am, by:  Will Adams (Draco) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Peter from what I have seen it's drops from around 2100 down to about 1400 and picks up again. This is on lift off of the throttle.
Braden Murdoch
DieHard
NSW
Cressida 1JZ TT

Posts: 614
Reg: 04-2006

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Tuesday, May 29, 2007 - 12:42 pm, by:  Braden Murdoch (Ribfeast) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I've noticed this too, esp when the coolant isn't up to temp yet. Always wondered what it was :-)
Joel Moore
TryHard
SA
91 Soarer TT

Posts: 205
Reg: 10-2006

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Tuesday, May 29, 2007 - 03:39 pm, by:  Joel Moore (Ttsoai2ei2) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

its your climate control idle raise solenoid?
happens to me on cold mornings when im using the climate control.
Trent Osborne
Tinkerer
florida
sc300 na.sc400tt

Posts: 28
Reg: 11-2006

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Tuesday, May 29, 2007 - 11:39 pm, by:  Trent Osborne (Sc250tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

same thing happens to my car ,as soon as it warms up it fine

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