Last post on Jul 08, 2010 at 5:49 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee
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Jeep Grand Cherokee, Auto Repair, SUV
#1 of 2 99 Jeep Grand Cherokee Laredo AWD
Jul 03, 2010 (3:59 pm)
Ok so i have 2 problems and i think they are two different ones. First a couple months ago i hit railroad tracks and my jeep shut down completely, so i towed it to my mechanic and he found a fuse blown. But when i drove away the transmission started acting up. When driving it would shift in and out of different gears sometime going into neutral all on its own. Since then it has changed to where when started it automatically goes into third and stays there wont shift in or out. I can turn it off and it will run fine but if i stay at any continous speed it will shift back into third and stay there.
Second I have developed a starting and stalling problem. Sometimes it will take two or three tries to start and will die if sits at idle. (ie stop light, sign, or parked.) Im thinking the first problem is the TCM and the second is a fuel pressure problem. I have looked through 300 pages of this forum and found things that where close but not quite the same. I love my jeep and want to give it a longer life. Please help if you can. Thanks!
#2 of 2 Re: 99 Jeep Grand Cherokee Laredo AWD [99jeepgclawd]
Jul 08, 2010 (5:49 pm)
Which fuse was blown? Get a service manual. Cover the basics, fluid level, good fuses, disconnect the battery, retest, still having problems, scan for codes. I would start with blown fuse problem first. Which circuit and why will determine what components to test. Then I would inspect for chaffed wires. First along the circuit for the blown fuse, then under for the transmission wires. Check along the firewall stamped steel edges can cut into wire loom. I would also drop the transmission oil pan and change the filter, while looking for any exposed wires touching inside the pan. I had that before. Your stall could be the torque converter lockup at the wrong time OR in drive while ECM thinks your parked and doesn't turn up the idle. Work on fixing the transmission electrical problem first, the stall problem may resolve itself after fixing it.