Slight play when hard accelerating from dead start
05-11-2004, 12:17 AM
#1
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Join Date: Apr 2004
Posts: 27
Slight play when hard accelerating from dead start
Im sitting here trying to figure out a way to describe what i noticed just today when doing a little jack rabbit start from a stop sign in my 04 Max SL 5sp AT. When i hit the accelerator hard from a dead start, i feel a slight "gap" or "slack" in the drive train at the beginning of the acceleration.. and only at the beginning of a hard take off. Im no mechanic and just wonder if this is normal? I hope i described it correctly )p
SLB
SLB
05-11-2004, 01:25 PM
#6
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Posts: 27
Originally Posted by RaTgoesMaX
Can`t get a 5 sp AT - SL. Well we can`t in Canada, unless they are unloading all the 4 sp AT`s on us!
05-11-2004, 05:26 PM
#8
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Join Date: Jan 2003
Posts: 148
Im a little confused about what you're trying to explain as well. Is it maybe the tires skipping because they haven't gripped the road yet from so much power being pumped into just the 2 front tires all at once from a dead stop?
05-11-2004, 07:24 PM
#9
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Join Date: Jun 2003
Location: a meadow south of Atlanta
Posts: 8,143
The Nissan announcement back around the first week of February said that all SLs manufactured after Feb 5th would have 5 speed automatics. The four speed SLs in Canada either have serial numbers lower than 891000 (made before Feb 5th), or Nissan is still making 4 speed SLs just for Canada (which would surprise me).
As to the hesitation on rapid acceleration from standstill, there is the possibility this may derive from the fact the throttle linkage is no longer mechanical, but 'drive-by-wire'.
More likely, it may be a function of the tranny, which may not actually be putting much pressure on the drivetrain while at idle, so, upon acceleration, there is an instant when the 'slack is taken in'. With hard acceleration from idle, this instant is greatly magnified.
Some experimentation might narrow this down. If you keep the car stopped by pressing hard on the brake, but are reving the engine up aroung 2500rpm, then let off the brake as you accelerate hard, a delay would be more likely to be the 'drive-by-wire' function. If the hesitation is no longer there, then this is probably a function of the tranny.
The engineers among us may have other ideas or explanations . . .
As to the hesitation on rapid acceleration from standstill, there is the possibility this may derive from the fact the throttle linkage is no longer mechanical, but 'drive-by-wire'.
More likely, it may be a function of the tranny, which may not actually be putting much pressure on the drivetrain while at idle, so, upon acceleration, there is an instant when the 'slack is taken in'. With hard acceleration from idle, this instant is greatly magnified.
Some experimentation might narrow this down. If you keep the car stopped by pressing hard on the brake, but are reving the engine up aroung 2500rpm, then let off the brake as you accelerate hard, a delay would be more likely to be the 'drive-by-wire' function. If the hesitation is no longer there, then this is probably a function of the tranny.
The engineers among us may have other ideas or explanations . . .
05-11-2004, 10:25 PM
#10
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Join Date: Apr 2004
Posts: 27
Originally Posted by lightonthehill
The Nissan announcement back around the first week of February said that all SLs manufactured after Feb 5th would have 5 speed automatics. The four speed SLs in Canada either have serial numbers lower than 891000 (made before Feb 5th), or Nissan is still making 4 speed SLs just for Canada (which would surprise me).
As to the hesitation on rapid acceleration from standstill, there is the possibility this may derive from the fact the throttle linkage is no longer mechanical, but 'drive-by-wire'.
More likely, it may be a function of the tranny, which may not actually be putting much pressure on the drivetrain while at idle, so, upon acceleration, there is an instant when the 'slack is taken in'. With hard acceleration from idle, this instant is greatly magnified.
Some experimentation might narrow this down. If you keep the car stopped by pressing hard on the brake, but are reving the engine up aroung 2500rpm, then let off the brake as you accelerate hard, a delay would be more likely to be the 'drive-by-wire' function. If the hesitation is no longer there, then this is probably a function of the tranny.
The engineers among us may have other ideas or explanations . . .
As to the hesitation on rapid acceleration from standstill, there is the possibility this may derive from the fact the throttle linkage is no longer mechanical, but 'drive-by-wire'.
More likely, it may be a function of the tranny, which may not actually be putting much pressure on the drivetrain while at idle, so, upon acceleration, there is an instant when the 'slack is taken in'. With hard acceleration from idle, this instant is greatly magnified.
Some experimentation might narrow this down. If you keep the car stopped by pressing hard on the brake, but are reving the engine up aroung 2500rpm, then let off the brake as you accelerate hard, a delay would be more likely to be the 'drive-by-wire' function. If the hesitation is no longer there, then this is probably a function of the tranny.
The engineers among us may have other ideas or explanations . . .
05-12-2004, 02:26 AM
#11
Senior Member
Join Date: Jul 2003
Posts: 392
This is very interesting. The hesitation many of us, that had the 02 Altima felt was attributed to timing at first. Many vehicles just had bad MAF sensors and the bottom line was some sensors were replaced and timings were advanced and some did both.
My problem was solved with a new MAF sensor.
My problem was solved with a new MAF sensor.
05-12-2004, 07:16 AM
#12
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Join Date: Apr 2004
Posts: 27
Originally Posted by RaTgoesMaX
This is very interesting. The hesitation many of us, that had the 02 Altima felt was attributed to timing at first. Many vehicles just had bad MAF sensors and the bottom line was some sensors were replaced and timings were advanced and some did both.
My problem was solved with a new MAF sensor.
My problem was solved with a new MAF sensor.
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