J 30 T not shifting from first gear

General discussion forum for J30 and M30 owners!
jraine
Posts: 2
Joined: Sun Dec 17, 2006 4:59 pm
Car: 94 infiniti j30 t

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MY 94 J 30 T HAS ABOUT 122, 200 MILES ON IT. RECENTLY WE HAVE REPLACED THE FLY WHEEL,IGNITION,TENSION ROD AND HEADLIGHT LAMP. WE ARE NOW HAVING PROBLEMS WITH THE TRANS THAT CAN NOT BE DETECTED WITH OUR MECHANIC. hAS ANYONE HAD PROBLEMS WITH THE TRANS GETTING HUNG UP IN FIRST AND NOT CHANGING?

WE LOVE OUR PAID FOR J 30T

HELP,

NET


driverdriver
Posts: 3397
Joined: Fri Aug 01, 2003 10:36 am
Car: NICO's longtime resident Canuck!!!
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Welcome to NICO!!!

First of, please don't post in all caps. It conveys that your yelling.

As for the transmission, does it rev to change gears and won't go from first to second or second to third?

It could possibly be your transmission rev sensor.

More information is needed to help you.

xxcrashxx
Posts: 316
Joined: Fri Aug 04, 2006 3:41 pm
Car: 95 Infiniti J30
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does it not go in reverse??? i had a similar problem with it. my car wouldnt go in reverse unless i reved it up to like 6000 rpm's, then it would violently shift into reverse, tires squealing and the works. and i had problems shifting from first. if i had the car sitting still and not on for like 4-5 hours, it would work prefectly fine, until i try to shift from drive to reverse. the mechanic i went to said it was the "planetary"(sp??) gear was stripped. had to have the transmission replaced.

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95-J30tt
Posts: 463
Joined: Tue May 02, 2006 5:46 am
Car: 95 Infiniti J30tt (Twin Turbo)

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by the way, if the planetary gears are stripped, the transmission would not shift into any gear, and the car would not move at all, as the planet gears along with the sun and ring gears do all of the transfer of power, and the transmission gear ratios totally depend on these set of gears. that is very very rare to happen as these gears are made very tough, chances are that the clutch plates in the auto transmission would be damaged long before the planetary gears...

as for the shifting problem, check your shif solenoids, i think that is a good way to start, and if it is only a problem changing from first, then most likely it is a shift solenoid, hope this helps, good luck

nsfantodd
Posts: 4
Joined: Fri Dec 22, 2006 1:31 pm
Car: M30

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95-j30t wrote:by the way, if the planetary gears are stripped, the transmission would not shift into any gear, and the car would not move at all, as the planet gears along with the sun and ring gears do all of the transfer of power, and the transmission gear ratios totally depend on these set of gears. that is very very rare to happen as these gears are made very tough, chances are that the clutch plates in the auto transmission would be damaged long before the planetary gears...

as for the shifting problem, check your shif solenoids, i think that is a good way to start, and if it is only a problem changing from first, then most likely it is a shift solenoid, hope this helps, good luck
Can the shift solenoids affect reverse?

TIA,Todd Templeton

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elwesso
Posts: 30810
Joined: Sun Feb 23, 2003 4:52 pm
Car: 94 Infiniti Q45t 5 spd
2007 BMW M Coupe
2007 Infiniti G35 S 6MT
Location: Indiana
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A bad solenoid would most likely throw a transmission malfunction code... Reverse isnt controlled by the solenoids IIRC, you just shift it and it actually puts the trans in reverse, not the solenoids putting it in reverse....

Not shifting out of first to me the first thing Id check is the TPS...

DominickJ30
Posts: 856
Joined: Tue Jan 18, 2005 8:10 pm
Car: 1993 Infiniti J30t

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Yes the solenoids have alot to do with allthe gears. Except 3rd which is direct drive.


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