Nissan Repair: shift, nissan altima gxe, internal seals

Question
QUESTION: Hi,

I have a 99 Nissan altima gxe that had a recent tps change.  The code that nows shows is po1705 and the transmission shifts hard on the first shift only but the rest are fine.  When it's cold all gears shifts fine.  Can you tell me if the po1705 code and the hard shift are related?  What can I do to fix it? Also, this is a used engine in this car.  the old engine was a 2.4 this used one is a 16 valve.  Could that have any thing to do with the shifting?

Thank you in advance.

ANSWER: Hello -

The PO1705 code is automatic transaxle.
So, yes, it is related. Assuming that you have checked and changed the automatic transmission oil, I would get an additive called AT205 and pour it in your transmission case. Carquest carries it, but I am sure you can get it anywhere.

If that does not work, I would take it to a reputable mechanic and have them check the transmission shift pattern. If the TPS was replaced, perhaps the transmission itself needs the work.

Hope this helps -
aloha
calvin

---------- FOLLOW-UP ----------

QUESTION: Aloha Calvin and thanks for the advice.  I just wanted to point out that I have not changed the transmission fluid but have added some lucus as recommended by a transmission shop.  I was wondering if that at205 is something comparable to lucus as I don't want to waste my money again if it is. Also you mentioned a shift pattern....is that something that could be done witout removing the whole transmission?

Thanks again.

Answer
Hello Hyer -

I would assume that the Lucas is similar. Just that I have had great results with the AT205, where it brought transmissions back from not shifting at all. Anyway, the basic function of the additives are to beef up the internal seals in the transmission. Oil gets channeled through ports in the transmission and if any seals are leaking, would cause rough or no shifting.

If it is the latter, adjustments will not matter, as the problem is internal and an overhaul would be the answer.

Shift patterns can be adjusted to a certain extent, such as the overdrive feature (sometimes called "power") on your shifter stick. However these days, the adjustments are mostly electrical and internal. I would wonder if you disconnect the TPS, would the car shift differently? Might want to try that.

Hope this helps -
aloha
calvin