I have a 2002 SE 6 speed with 79K. Since I got the car last June I have put 29K miles on it. In that time I have noticed a significant loss of power. I also have a hesitation problem around 2500rpm - 3000rpm. Anything above 3000rmp is good but if it try to get on it around 2500rpm the car bogs down hard. I have read a lot of threads about changing the MAF and the car having a "like new" feel again. I replaced the MAF last week based on these threads. I bought the MAF that I had to swap the thermal resistor and that went fine. I installed the new MAF, followed the ECU reset instructions and went for a test drive. I got that "like new" feeling that everyone talks about so I thought my problems were fixed. Then about a week later my same problems are back. Hesitation around 2500rpm and overall power loss. So this leads me to believe that the ECU reset wiped away the problem and then slowly adjusted after driving for a week. Based on that information what else could be my problem? I am thinking about changing spark plugs but other than that does anyone have any suggestions?

Thanks in advance,
Brandon

 

I have the same hesitation that you have. I believe the problem is not with the MAF. Do you have an aftermarket intake?

 

Any other codes, MIL's..?

 

damn, this is scary. Althought I just got mine, i havent experience any problems yet, but this might be something to look ahead

 

There was a ECU flash update from Nissan to eliminate this problem. I don't have the TSB handy, but I pulled my work order from the dealer and they did a "DE98A1 ECM reprogramming".

This was specifically for 6 speeds.

 

I've been experiencing the same problems viper has on my auto, so it couldn't be the same problem if the ecm update applies to 6 speeds. The hesitation has reduced some after removing my aftermarket intake (cone filter) and putting in the stock airbox. Any other Ideas it could be?

 

Um...have the same thing..and i only have frankencar intake...I have an auto tranny. I had the same thing with my previous car when i threw on the intake. What i think happening...you losing bit of tq b/c of the cone filter..but the nice thing is the gain in hp..at the upper rpms..

my two cents

chas

 

My car is completly stock, for those of you that would contribute these symptoms to an intake.

My car is not throwing any codes. In the past it has thrown one code indicating that the seal on the gas cap had failed. So I replaced the gas cap and have never had it again.
MIL's.....what is that?

I hate to go to the "stealership" without knowing what I am talking about. Does anyone have more information about this specific TSB. Do you think if I go into nissan and ask them to perform "DE98A1 ECM reprogramming" they would have any idea wah I was talking about?

 

http://maxima.theowensfamily.com/tsb/NTB03-022.pdf

Check out this link to nissan's TSB. I will go to the dealership as soon as I can. Now that it is 2006 and I am well out of warranty, I wonder how much this will cost me.

 

well actually i just went to the dealdership to change out my maf sensor, *got a freind that works in parts*. Well i switched out the thing, and i started to drive, no difference then the light came on.. took it too my other friend who owns a shop and he multimeter tested it.. cuz the code that came up said there was not reading of the temp. took the thing out, and saw no resistor, so i just took it back got another one and same thing, then i finally read the paper..... *silly me, always in a hurry* turns out that it needs to be reprogrammed.. well my old one felt faster anyways, so just returned it for now. dont know if i really need it, cuz its not sluggish or anything.. i just kept seeing you guys change it when you didnt think you had to and then voila......... you felt a big difference.. i was gonna get the timing advanced but all you 3.5 guys said you dont feel a difference and i have a cold air intake. so.. basically it needs to be reprogrammed.. am i right??

 

I have a 2000 Maxima SE that will shudder and lose power when the rpms hit around 2500. The car will not rev above 2500 but is running smoothly when kept under 2500rpm and will shift up through every gear.

I just replaced the number 1 Ignition coil but not sure if this is really related. Ran a code scanner on the car and got a P0403 - EGR circuit Malfunction reading back on it. Any idea what the problem could be? Thanks!

 

I work for a Nissan dealership and have done this job before. Tho u replaced the MAF, Your ECM part number had to apply to the TSB. for reprogram.

Hopefully your swirl control valve is not failing. You have to change the intake manifold to fix that. Does it happen when it`s cold/hot or all the time?

 

I was just thinking about the variable intake air system. If it is failing (vacuum hoses, stuck open, etc) or removed...it would be similar to what the OP is experiencing.

 

IMO, bumping old threads needs to stop. Post it in the newbie thread.

Also, swirl control valve, on an 02

 

I have Maxima SE 2000 automatic.Around 2500-3000 rpm my car has hesitation and bogs.I changed throtle position sensor,idle air control and repair air intake on the throtle body.Now is the interesting part.When the engine is cold everything is o.k.,but when he reach to optimal temperature begin hesitation and bugs around 2500-3000 rpm.I put the neutral gear and turn off the engine,switch on,put on the direct gear and... everything is o.k.The car run and accelerate perfect,don't has a problem,it's absolutely different car.I can't understand what is this?What suppose to do?I hope to somebody help me with information.Do you know guys for other case like mine? The code is P0403

 

I get the same hesitation around the 2500K to 3K point. It all started once I installed my intake. I believe it messes with the Air/fuel. I have just ordered a new MAF. I have already replaced all plugs, alternator, battery, installed engine grounds, and other small things.

NOW I THINK ABOUT IT!!! I think its the PRECATS!!!
Whenever im hitting that RPM range, I get precat rattle, it has been diagnosed by myself and a master mechanic. I also got CAT code PO420. I am working on getting headers to solve the problem.

I truly think if you have lag around 2500K-3000K it is exhaust/precat (if u replaced MAF already)

I know for a 100% fact my precats are bogging down the car. The material inside moves around and obstructs airflow causing odd acceleration, and for me a SMALL sputter ever 5 minutes at idle (you can hear the precat material move and rattle, and I have verified its not a heat shield)

I hope this info helps.

PS you may not hear the precat rattle, but this does not mean it is not bad.