7AT tranny <40mph

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09-06-2009, 01:48 AM

#16

G37beijing

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Quote:

Originally Posted by eman76b2001

I just took mine in today and they said my TCM was up to date. They went ahead and updated my ECU and it made a huge difference. I noticed the downshifting problem and read about the fix on this forum.

EMAN: Do you have the version of ECU that the dealer used? Perhaps it's listed on the service receipt.

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09-06-2009, 01:49 AM

#17

G37beijing

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Quote:

Originally Posted by eman76b2001

EMAN: Do you have the version of ECU firmware that the dealer used? Perhaps it's listed on the service receipt.

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09-06-2009, 03:33 AM

#18

Keng

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I can get 18+ MPG driving local to work. I can get near 20 MPG if I am careful with my lead foot.

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09-06-2009, 12:06 PM

#19

mw09g37

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i know... i think that's my point right there. lead footed, I can get 17-18... that's why my commute (expressway) should not be eating this much gas (16.8).

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09-06-2009, 03:52 PM

#20

eman76b2001

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G37beijing from what I see on the sales receipt they just say performed ITB and replaced ECU. I will find out what version they updated me 2. FYI i went to sewell infiniti in houston and they were very familiar with the problem. I asked him to let me know if they come out with any more updates.