92 G20 AT transmission Probs

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roffler
Posts: 2
Joined: Tue Jul 29, 2003 9:38 pm

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First gear to second gear is hesitant, and it gives an uncomfortable jerk. It's been like this ever since I've had the car, when it had 40,000 miles, and now it has 60,000 miles. This happens both when it's cold and hot. I went to a local infi dealer, and they said diagnostic was going to cost about $260. Anyone know exactly what I should look into?

So far I've heard that motor mounts, and the P10 transmission resistor may need some work... anyone else have any other ideas?


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elwesso
Posts: 30810
Joined: Sun Feb 23, 2003 4:52 pm
Car: 94 Infiniti Q45t 5 spd
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Has the fluid been changed along with a filter change and pan drop......? Thats the first thing to check......

braxtonj
Posts: 4
Joined: Sat Jul 26, 2003 3:49 pm

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Check that the downshift cable is correctly adjusted. If the acumulator spring breaks, the trans really slams hard into second. The cable being out of adjustment causes a harder than normal l shift, but not a slam like the broken spring

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autotech43
Posts: 130
Joined: Sat Jan 04, 2003 2:14 pm

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The G-20 RL4F03A does have a kickdown cable, but if the trans is the RE4F03A, the shifts are controlled electronically. This thread was in the infiniti general post earlier. My reply.1992 G-20's do have a firm 1st to 2nd shift. That was one of the complaints when those vehicles were brand new, transmissions in that vehicle have a slightly higher line pressure than other Infiniti vehicles. The internal brake band (holding device) comes on between the 1st to 2nd shift which can create a slight shift shock with the line pressure at the top of the scale. I have also noticed when the rubber in the 3 motor mounts get fatigued, the excess movement of the engine/trans will tend to transfer an even more noticeable shift shock to the body. I would suggest getting ALL the motor mounts checked, with the age of the vehicle, not necessarily the mileage, a good chance you need the mounts replaced. I personally would rather have a firm shift than one that slides the shift to the next gear. I also will note, If I test drove the vehicle and considered the shift to be abnormal, to accurately diagnose would take some testing, readings on the line pressure, resistor and solenoids if equipped, in other words it's not the type of concern where you diagnose in a few minutes, if there is a problem!


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