I was starting up my jeep, 04 Grand Cherokee 4.7 HO 253K, my fingers were greasy from the shop and slipped off the key before just before the engine started. Since then things have acted pretty funny...
It took a while to start after that probably a good 15 seconds of cranking, the odometer was flashing, the radio would cut in and out, and when i shut it off the gauges would twitch and sweep. After that, no power anywhere. I disconnected the battery and let it sit for about 10 minutes, no troubles for a while. Then it would happen more frequently, now even when i disconnect and reconnect the battery i have no power. Every now and then i get power, ill turn the key over and have normal power, but it will sound like a dead battery. Battery is new and has proper charge, charging system is in order, and when I would get it started it would run perfect.
All i can think of that could cause this would be that i shorted out a computer, any other opinions?
What would i go about replacing though? When it does decide to work, there isnt a single thing that doesnt work. Shifts fine, all windows, heated seats, etc work. I mean i drove it from Michigan to Ohio, a 200 mile drive, without a hitch. And that was after i disconnected the battery to try and reset things. It reset and drove fine for 3 hours, then i went to get food 20 minutes after I got into town and nothing.
Doesnt the PCM control how the vehicle runs though? When I get it started there is absolutley nothing wrong with the car, drives like it has for the last 253,000 miles haha. Does the BCM control anything that has to do with starting the vehicle? Its weird, when the gauges sweep, I lose all power in the Jeep. No power locks, windows, radio, etc. which makes me suspicious of the BCM..
Nevermind, locks and windows have to do with the door modules, correct? So im at a loss. When its dead, its as if I have a completely dead battery after the gauges act up but the battery is fully charged
Could it possibly be some intermittent short causing things to just go erratic? Another thought, is there an ignition switch at all on the WJ? My old XJ had problems with it and once replacing was ok again. Not sure how it is setup on the WJ as I've not had to deal with it as of yet.
Probably not the issue, but would anyways clean the battery connectors and posts, and reattach them and ensure they're tight. As well, take off the battery ground at the block, clean everything and put back tight. They're known to cause issues and I've run into them before myself. Also check the ground from block to the firewall. As it's been said many times, strange things happen with WJ's due to power and grounds not being clean/tight.
The beatings will continue until attitudes improve!