Question about 1992 Jeep Cherokee Sport

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No Reverse. Hi RPM's to get forward gear to engage, then it runs fine. But from start, I have to rev it higher than normal. Reverse works intermittently, but have to rev it to get it to reverse also.

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You have weak clutch plates that need to be replaced. 1st and reverse gear plates are in the same group in the clutch drum assembly

Posted on Jan 30, 2010

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The revs should be around 700- 900 rpm while in neutral. Revs about 2 (2000 rpm) is absolutely abnormal, and of course the vehicle will **** with any gear change. Furthermore, continued operation of the car in this condition will damage the transmission. Seems like the idle sensor, MAP sensor or other part is working incorrectly. Take vehicle to a shop for a scan of the computer and repair, in order to save the VERY costly transmission.

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We repair our Toyota Lucida automatic transmission because in runs on reverse only. Our problem now is that it will start to move forward only, once the engine RPM was between 1800 to 2000. Another thing,...


The problem concerning low gear locked up sounds like a bad primary shift solenoid (located on the valve body internally) the other issue with the forward gear only engaging with the rpm up to 1800 could be inadequate hydraulic pressure (a transmission front pump issue), most likely there is no problem with the pump if when shifting the selector lever into reverse it engages quickly and normally. This may be a transmission computer issue and I would recommend having the dealership do a diagnostic check on the transmission to eliminate the computer as a culprit. transmission problems are very difficult to figure out and before spending a lot of money get the electrical diagnostic done first.

Dec 07, 2009 | 1992 Toyota Previa

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Car goes into reverce but does not engage completely works fine in forward, when in reverce it seems lik it wants to ingage but does not. it makes a chattering sound and feeling. what electric part puts...


Hello. As you know, the transmission is one of the more sophisticated components in any auto. It takes the most transmission pressure to engage reverse, third, and fourth gear in an auto tranny. In an auto tranny, the shifter is connected to a linkage that manually shifts between the different gears in the transmission. When you shift into reverse, all transmission pressure is concentrated to engage reverse. When you shift to drive the transmission will operate normally, building pressure until it can shift into the next gear. With third, second, or first gear selected it will lock out all higher gears (Unless the TCU detects overrevving of the engine, in which case it will override gear selection and upshift to avoid engine damage). All the TCU does in a modern auto tranny is control shift points. Years and years ago, shifting was controlled by a spring attached to the gas pedal. When the gas pedal was depressed, the spring would expand. As tranny pressure grew, the spring would become compressed until it was fully compressed, engaging the next gear. The harder you stepped on the gas, the longer you went until the tranny shifted. In modern transmissions the TCU dictates shift points, and not much else. The TCU will also control when the torque converter will lock, but that's where it's duties end. The problem with engaging reverse is either a linkage issue, or a problem with the pump not building enough pressure to fully engage reverse.

Try putting the shifter in reverse, holding the brakes firmly, and giving the car gas. If the car reaches a higher RPM and suddenly slams into reverse it is the pump. The pump will only build enough pressure to engage reverse with higher RPM's. If the pump is severly damaged it won't engage at all, but if this is the case it probably won't engage third or fourth gear either at that point. If the problem is with the linkage, reverse just won't engage whatsoever, despite RPM's. I'd say start with the shift linkage. If it's bent or misadjusted it could cause reverse to not be fully engaged. The TCU doesn't control reverse at all, since there are no shift points and no need for the torque converter to lock.

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WHEN YOU PUT THE CAR IN DRIVE IT WILL NOT GO ANYWHERE


Its the electronic shift control located just under the battery ontop the transmission replace or repair will solve the issue

it'll go into drive but once it reaches 1500 rpm it'll drop into neutral as a safety because at this rpm it is being told to shift gear and when it fails to do so it safely goes into neutral

it will go into reverse just fine and park and you can run all the low drive gears until you reach 1500 rpm then it'll cut it off

i pulled mine out re soldered bad components on the board to fix it but im an electronics engineer it may be easier for you to just replace it

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Car does not drive forward but works in reverse


Sad to say but your automatic transmission has bit the dust.

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Hyundai excel 1996 automatic will engage reverse and park but no forward gears. Gearbox was overhauled 3 years ago, new seals etc. Oil level in the main transmission is ok and no apparent leaks. Problem...


It appears you have a Forward Clutch FAILURE. Replace the trans after you get it diagnosed and verified by a professional technician. By the way, do you have a Check Engine light? If so, what is the diagnostic code? The dealership can scan the system and find any codes which may have been stored in the TCM (Transmission Control Module). If there were any 'Incorrect Gear Ratio" codes, it's most probably the trans itself.

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REVERSING PROBLEM


check the transmission fluid and make sure it isnt low.

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