....or is it because the fuel around here in the NorthEast is no longer oxygenated?

I don't know if it is a coincidence or not, but 2 weeks ago I had the ECU Update TSB done on my 2K3 6sp and my MPG is now 22 MPG. I was only averaging between 17- 19 before. I still use the same gas and drive the same. I've already filled up 3 times and I have been keeping track of the total mileage since day one. I don't remember when the gas stations around here switch back to the normal blend.

 

Hi..

Not sure about that one cause I haven't gotten it done yet.. but I was wondering, where did you get the TSB done, and did you have any trouble? Did the service dept give you the ol' "We can reproduce the symptoms" routine?

Just curious cause I want to get it done,
Nick

 

I think the fuel difference you seeing is because they not using winter fuel anymore. I noticed that my car is getting better mpg too, but I didn't do that ECU TSB yet.

About that TSB, what does it do and what is it for? Do they only update the ECU or replace the MAF too? I have intake installed and don't want them to mess things up if they have to remove my MAF.

 

I usually get around 23 to 24 city driving, I live in NJ. Ofcourse my TRIP computer said's I get 27!

 

I think at last count there were a billion threads on this; here are a few...

https://maxima.org/forums/showthread...&highlight=ECU

https://maxima.org/forums/showthread...&highlight=ECU

https://maxima.org/forums/showthread...&highlight=ECU

https://maxima.org/forums/showthread...&highlight=ECU

 

I agree, my 2k3 auto is now getting 21mpg (doing the calc. by hand), vs. the 18-19 mpg I was getting in winter. Driving the same way, usign the exact same gas (Hess 93 octane). It must have to do with the warmer weather too, b/c the car doesn't need as much time to get up to temp.

Note: I didn't get an ECU update, no hesitation, no need to.

 

went for tsb update,dealer refused to do ,clain need a code call from check engine light, for nissan too OK.

 

Absolutetly NOT, go back and ask them to see the TSB. I specifically states that if it is a 2003 6spd and it has the new MAF, and the customer uses "super" grade gas, the TSB needs to be performed once the car does have signs of hesitation.

 

The ECU they shouldnt give you any problems at all but the MAf has to be pt# 22680-6N200 or 22680-6N201 which is mainly on 02's and a few very early 03's. If your MAF is part# 22680-AM600 that is the latest MAF and they want touch it. I had my ECU reprogrammed on my 03 and I feel a slight difference although I never really had the hesitation problem that much.

 

The service writer started to give me some attitude when I mentioned it to him and then he asked if I knew what the TSB number was. When I told him I had a copy of it in the car, he shut up and continued writing the service ticket. (thanks to the .org for the copy of the TSB)

Car seems to run a little smoother and no problems to date. I did not need the MAF replacement.