I have a 1993 Infiniti J30t with about 135000 miles on it and it starts fine but when you drive it for a few minutes the RPM’s shoot up and the car slows down and eventually stops. It won’t cut off but when you hit the gas it just revs up but doesn’t move. I had asked someone at the auto parts store and they said something about a idling control sensor or idling air control sensor. Then this mechanic came by to check it out and he said when it hesitates before it goes in gear so its the transmission. Also their is something going on with the security feature I believe. Thank you for anyone who can possibly help me.

this car has notorious issues with the MAF!
clean it, replace it, whatever...sounds like it to me...

What is the MAF?

mass air flow sensor
do you have the FSM?

What is FSM?

check out page EC111

Ok I will thank you very much

mac here, I have same year car , I'm a mechanic and union electrician , and I'll focus on what I've experienced and the most important / most expensive possibility which is transmission - if it's toast you have serious decisions to make , and certainly do not need to spend a hundred$$$ at a time on sequential "possibilities"? Do not try to test drive ,drive too much more I suspect transmission may be very dirty / clogged . This happened to my car - there were black flakes like "black coconut flakes" , a transmission guy at the dealer told me these trans can do this if never done the fliud/filter screen change. I'ts supposed to be a kind of kevlar (he may be off on that) coating in the torque converter , sheds.There will always be pieces in the trans. pan on virtually " any mileage Trans. change" - don't be swayed by a shop / mechanic 's horror story or upselling rebuild . Best if done yourself , with buddy ,best a "mechanic buddy" . The cost of this is about 15% more than a "MAF' , or "IAC" , or "inhibitor switch" - do it now ,today ! (like a TV ad!) MOST important use Dealer fluid & dealer screen , 2nd best ATF is Castrol "for Japanese eforeign cars - Type Dexron III equivelent" - yes this is still available and best formulated to original specs of the Nissan-D fluid. Lastly if this helps,specific to this problem , AND the trans WAS very "dirty" - it's worth it to repeat again (screens on these can be reverse blown out w/ brakleen if fairly new & never very dirty) say next year , say 10-15k mi .
Glen 11/25/2017

Thank you very much and I’ll look into that Monday

have you done anything to the J30? is it still running the same?

fourdrinie wrote: ↑

Sun Dec 10, 2017 1:59 pm

have you done anything to the J30? is it still running the same?

It is still running the same for a couple of reasons. I’ve called around and the closest dealership is 2-2/12 hours away and claims to know nothing about or any way to check my car because it’s a 93. He even asked me if it was still running (I took a deep breath). I go out every couple of days and start it up back it out and put it back. I just don’t know what to do

here's a thought.....it's basically the same engine, transmission as a Datsun Z car
see if there are any mechanics in your area that used to work on the Datsun Z models....they would know the diagnosis and fix

fourdrinie

I will start asking tomorrow thank you for your help!!

Change or clean the transmission filter screen, if no change, find a used transmission.

J30tChumpCar wrote: ↑

Mon Oct 15, 2018 6:23 am

Change or clean the transmission filter screen, if no change, find a used transmission.

Thank you! I’ll have that changed and if it doesn’t work I will most definitely start looking for a transmission.