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Ask Jan Andersson Your Own Question

Jan Andersson
Jan Andersson, ASE Master Tech
Category: Car
Satisfied Customers: 795
Experience:  20 years of automotive repair & modification, USA, Asian, Euro, old & new cars. Porsche technician.
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2000 Isuzu Trooper: experiencing problems..v6 LS...130k miles

Customer Question

We are experiencing problems with 2000 Isuzu Trooper V6 LS. We bought the vehicle used at 130k miles. Car is in good shape but recently was diagnoised needing a transmission. Upon using a local mechanic, he replaced the tranny with a rebuilt that failed on the maiden voyage out on a long uphill climb with smoke and liquid pouring out. The next tranny replaced also lasted a few hundred miles before failing in the same type of scenario with the car being pushed in a series of uphill climbs on US1 along the CA coast, it wouldn't power up to climb a hill from a low speed. The mechanic couldn't get a tranny next, so the original tranny was rebuilt. Again, failure in an uphill climb along winding US1, no power to make the hill.
WHAT is wrong? It is an electrical problem that we cannot explain to the mechanic to have him find diagnostically on his machine. We now are renting a car again and wondering if he CAN fix it.
Submitted: 5 years ago.
Category: Car
Expert:  Jan Andersson replied 5 years ago.

 

Hi,

 

I am not an Isuzu expert, but I wanted to give you some things to check;

Have the mechanic check if the transmission control unit is keeping the converter lock engaged for some reason. It would be an electrical problem within the separate control unit, and that would explain why replacing the entire transmission doesn't help. They would all fail because the root problem is in the control unit that is located in the car somewhere. Your mechanic could try to obtain a wiring schematic for the vehicle to identify the wire that controls the converter lock (TCC) and then backprobe it to monitor the signal on a test drive. It should release at least when the brake pedal is applied, if it didn't, your car would shake and stall every time you stopped.

 

Also, if the control unit is trying to engage two gears at the same time, it would cause unporedictable problems. Maybe try a used control unit from a wrecking yard before spending money on a new one? A good manual would tell how to troubleshoot and test your transmission model. It would involve measuring fluid pressures via a test port too.

I would talk to a shop that specializes in transmission repair.

On some vehicles you can unplug the control unit and drive the car as if it were a manual shift. It would disable the converter lock too. Not sure if this can be done with your vehicle, it could help isolate the problem. Just need to be careful with the test drive and catch any problems early, before more damage occurs.

 

That's all I have to offer, I hope other experts would chime in and help you further.

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