NA Automatic transmisson
NA Automatic transmisson
My transmission (automatic Z32) skips second gear and goes to third . and the only way it will go to fourth is if the OD button is on . it also will not come down gears when slowing down unless I completely stop . someone help
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nissanfreak12
- Posts: 1709
- Joined: Sun Jan 23, 2011 4:07 pm
- Car: 92 300zx 2+2 TT
- Location: Denver, CO
Re: NA Automatic transmisson
Check your Throttle position sensor, make sure it is adjusted correctly and working properly. Otherwise, you may have other issues.
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DCaff300ZX
- Posts: 4202
- Joined: Sun Jun 14, 2009 8:18 am
- Car: .
1993 CRP TT- Modified - Location: Tacoma, Washington
Re: NA Automatic transmisson
Welcome!
BTW, the Z32 AT is a 3-speed with OD being the 4th gear.
Beyond what Nissanfreak wrote, unfortunately the Z32 AT is a known bad unit that has a shorter life span than it's other components and suffers from a lack of serviceable fluid screen and a Nissan service feature of backflushing the trans to "clean" it, but which imbeds loose particles from a non-serviceable metal screen further into it and generally ruins it unless it has had regular flushing service from early on.
Once the stock AT fails, and it most likely will soon, I'd honestly look into a manual trans swap as the costs from a reliable Z or trans specialty shop will be close enough to the AT replacement costs to be worth doing, and which adds value and reliability to your Z32...just a thought.
BTW, the Z32 AT is a 3-speed with OD being the 4th gear.
Beyond what Nissanfreak wrote, unfortunately the Z32 AT is a known bad unit that has a shorter life span than it's other components and suffers from a lack of serviceable fluid screen and a Nissan service feature of backflushing the trans to "clean" it, but which imbeds loose particles from a non-serviceable metal screen further into it and generally ruins it unless it has had regular flushing service from early on.
Once the stock AT fails, and it most likely will soon, I'd honestly look into a manual trans swap as the costs from a reliable Z or trans specialty shop will be close enough to the AT replacement costs to be worth doing, and which adds value and reliability to your Z32...just a thought.
Re: NA Automatic transmisson
Nissanfreak12 makes a good point. The transmission runs off of information from the engine. The throttle position sensor tells the transmission the amount of load on the engine. If it is set too loose there will be play in the cable, and the transmission will shift prematurely thinking there is little or no load on the engine. If it is too tight, the transmission will never shift, or shift very high in the rpms, because it thinks that you are accelerating.
Another good thing to check is fluid level (always check trans fluid when engine is at running temp). If the fluid level is low it may not be feeding proper pressure to the valvebody, causing it not to shift properly, or not to shift AT ALL.
If you haven't already it may be a good idea to check codes. There are relatively few electronic componants on the Z32 transmission, but there are enough to catch major problems.
If the fluid level is correct, it may have a dirty transmission filter. I believe they are internal filters on the Z32 trans. If you pull the transmission pan off you should be able to see the filter. check to make sure it isnt plugged, and look around in the trans while you have the pan off. If you see sparkly trans fluid or chunks of metal or plastic, then you have a serious issue. If not, it may be something simple.
Good Luck!
Another good thing to check is fluid level (always check trans fluid when engine is at running temp). If the fluid level is low it may not be feeding proper pressure to the valvebody, causing it not to shift properly, or not to shift AT ALL.
If you haven't already it may be a good idea to check codes. There are relatively few electronic componants on the Z32 transmission, but there are enough to catch major problems.
If the fluid level is correct, it may have a dirty transmission filter. I believe they are internal filters on the Z32 trans. If you pull the transmission pan off you should be able to see the filter. check to make sure it isnt plugged, and look around in the trans while you have the pan off. If you see sparkly trans fluid or chunks of metal or plastic, then you have a serious issue. If not, it may be something simple.
Good Luck!
Re: NA Automatic transmisson
Did you get your transmission sorted out? Info is a plus.....