Loss of Power
08-10-2003, 10:45 AM
#1
Donating Maxima.org Member
Thread Starter
Join Date: Jul 2002
Posts: 127
Loss of Power
I've noticed the last 2 weeks my 2002 SE Max seems to be very weak when gunning it from a stop. I have an automatic. What happens is I just about floor it (To try and avoid being run over while merging on Palisades Pkwy!) and it starts off real slow. Eventually it picks up, but it doesn't have the power it used to. It used to roar through all the gears, now it doesn't seem to pick up until 2nd.
I've got 20,000 mi. on it, and had the 13,000 maint. done to it. I don't think it's the plugs yet and the stock airfilter looks good too. I use 93 Octane, and my AC is off. Has anything like this occured to anyone else. My only mod is an FSTB, so everything else is stock.
I know there's a hesitation TSB, but like I mentioned, this just started happening.
Maybe it's the humid weather?
Thanks...
I've got 20,000 mi. on it, and had the 13,000 maint. done to it. I don't think it's the plugs yet and the stock airfilter looks good too. I use 93 Octane, and my AC is off. Has anything like this occured to anyone else. My only mod is an FSTB, so everything else is stock.
I know there's a hesitation TSB, but like I mentioned, this just started happening.
Maybe it's the humid weather?
Thanks...
08-13-2003, 10:20 PM
#3
Junior Member
Join Date: Jul 2003
Posts: 28
I have a 2002 Maxima SE too & I have the same feeling. When the temperature is lower, the engine seems to perform better.
I noticed that there is a TSB for auto transmission for loss of power. I might bring the TSB & ask the dealer to check it. There is another TSB on the rear O2 sensors. I think I will ask them to check both TSB to be on the safe side. Will do this when I am back after a 5 week vacation back home.
I noticed that there is a TSB for auto transmission for loss of power. I might bring the TSB & ask the dealer to check it. There is another TSB on the rear O2 sensors. I think I will ask them to check both TSB to be on the safe side. Will do this when I am back after a 5 week vacation back home.
08-14-2003, 07:19 AM
#6
Junior Member
Join Date: Dec 2001
Posts: 21
Is anyone here familiar with the control loop (digital or analog) from the throttle by wire, the MAF, O2 sensors, and computer calculation time? If you backed off on the throttle and then tried re-accelerating does the problem go away?
What I am getting at is whether or not the control loop sampling time (if it is a digital throttle by wire) is trying to co-ordinate with the other analog signals via the computer control algorithm is occasionally causing a loss of power? The computer senses the throttle position possibly giving a proportional input voltage (via a transducer which has a time lag) and the computer also senses the MAF, controls the NDIS, meters the fuel injection and if some or perhaps any of these become mis-coordinated the engine backs up to a fall back idle point (reset) until the operator stops giving input via the throttle for a moment and then the system can resume normally?
I assume a situation like this is very rare, but if anyone could offer a good reason why it could not happen and explain it via the characteristics of the control loop that would help give a solid answer. Thanks.
What I am getting at is whether or not the control loop sampling time (if it is a digital throttle by wire) is trying to co-ordinate with the other analog signals via the computer control algorithm is occasionally causing a loss of power? The computer senses the throttle position possibly giving a proportional input voltage (via a transducer which has a time lag) and the computer also senses the MAF, controls the NDIS, meters the fuel injection and if some or perhaps any of these become mis-coordinated the engine backs up to a fall back idle point (reset) until the operator stops giving input via the throttle for a moment and then the system can resume normally?
I assume a situation like this is very rare, but if anyone could offer a good reason why it could not happen and explain it via the characteristics of the control loop that would help give a solid answer. Thanks.
08-14-2003, 07:25 AM
#7
Junior Member
Join Date: Jul 2003
Posts: 28
I will change the air filter when I come back from my trip. I have abt 10k miles & it is abt 1 yr + ago that I have this air filter. I agree that it is time to change the air filter.
But at the same time I will also do the TSB.
How do u clean the throttle body ? just wipe it down with a damp cloth ?
But at the same time I will also do the TSB.
How do u clean the throttle body ? just wipe it down with a damp cloth ?
08-14-2003, 07:32 AM
#8
Member who somehow became The President of The SE-L Club
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Join Date: Jun 2001
Posts: 16,033
Re: Loss of Power
Originally posted by grey2002_ny
Maybe it's the humid weather?
Thanks...
Maybe it's the humid weather?
Thanks...
Wait till this weather cracks and see how your car performs.
08-14-2003, 08:26 AM
#9
Senior Member
Join Date: Jul 2002
Posts: 307
Originally posted by E55AMG2
Do the TSB, and you wont regret it. I was one of the 1st autos to have it done and it made a night and day difference.
Do the TSB, and you wont regret it. I was one of the 1st autos to have it done and it made a night and day difference.
08-14-2003, 09:14 AM
#10
Senior Member
Join Date: Oct 2002
Posts: 1,554
you know, i just dont see it with my car any "hesitation" My max was one of the first 2002 6 speeds with no hlsd. I figure my car is in the selection of cars that has this issue, i just don't notice anything weird to be honest.
I'm still not even sure what you guys mean by hesitation, I assume it's something very obvious?
I'm still not even sure what you guys mean by hesitation, I assume it's something very obvious?
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