I hope someone can help. My 93, with an automatic tranny, will occasionally stay in 1st gear longer than necessary before forcefully shifting into second. This seems to happen only when the vehicle is at operating temperature. Also, after shifting to second, there is a subtle but noticable "air hiss" coming from the fire wall on the passenger side.
Could there be a vacuum leak?

Todd

 

maybe a vacuum leak, but you wouldnt hear it, probably a bad tranny. do a 5-spd conversion, is it a gxe or se

 

How do you tell the difference? I hope it's not a bad tranny! I don't have the cash for that.

 

Its probably the throttle positioning sensor, make sure you get an OEM and not an aftermarket. If you have the VE engine then its about $120 from courtesy nissan in TX.

When installing the new TPS, I've found that after installing the new sensor to run the engine and actually un plug the sensor while its running for a couple seconds, then plug it in again (I'm talking about the lower plug which is the actual TPS plug, the upper plug is the closed throttle position switch which needs to be set first so that when the throttle plate closes the switch is tripped. Its perfectly okay to do this since its apart of the procedure to set the base timming.

Another problem could be the dropping resistor for the tranny, which is very easy to check/replace.

 

Thanks Eric,
Can I find the instructions for these proceedures in the Chilton Manual?
Should I have my mechanic test these sensors? Or can I do it myself?