95wrangler Posted March 13, 2014 Share Posted March 13, 2014 Thanks for you'r input, 90.4x4 aw4 4.0 shuts down while driving. refreashed all grounds. cleaned TB. metered TB. changed CPS. fuelpump keeps preasure. Engine dies while coasting to stop .currently Under a-overpass waiting for the rain to stop.Almost,any help would be considered. Link to comment Share on other sites More sharing options...
95wrangler Posted March 13, 2014 Author Share Posted March 13, 2014 Problem started befor the rain. Link to comment Share on other sites More sharing options...
AeroNautical Posted March 13, 2014 Share Posted March 13, 2014 When that happened to me it was a bad alternator and a bad battery connection. Combined is a recipe for disaster, because when the battery is d/c and the alt can't produce enough power, the circuit is broken I believe, thus causing the engine to quit. Make sure your battery fasteners are tightened. To test my theory, start you engine and d/c your battery cable, if your engine quits, that's probably your problem. Link to comment Share on other sites More sharing options...
95wrangler Posted March 13, 2014 Author Share Posted March 13, 2014 Great idea! will let you know. Link to comment Share on other sites More sharing options...
gogmorgo Posted March 13, 2014 Share Posted March 13, 2014 Great BAD idea. If you disconnect your battery and it quits, you may have just fried something by hitting it with 100+ volts. ECU's in particular don't like high volts. Load dump is a real thing. You might get away with it a few times, but you're still poking a sleeping bear. Not a good idea. If you can get it running again (not sure why you'd be waiting under an underpass till rain stops if that was the case), most auto parts places will be able to test your charging system safely for you. Link to comment Share on other sites More sharing options...
AeroNautical Posted March 13, 2014 Share Posted March 13, 2014 Great BAD idea. If you disconnect your battery and it quits, you may have just fried something by hitting it with 100+ volts. ECU's in particular don't like high volts. Load dump is a real thing. You might get away with it a few times, but you're still poking a sleeping bear. Not a good idea. Wait, really? What would produce that much voltage? When the my alt went bad, the battery was the only thing keeping my engine running, and occasionally the contact would work it's way lose and I'd lose my engine. How could that be dangerous for the electrical? Link to comment Share on other sites More sharing options...
95wrangler Posted March 13, 2014 Author Share Posted March 13, 2014 A hunnard voltz?cumher hunny,hold thizzzzz. Link to comment Share on other sites More sharing options...
gogmorgo Posted March 13, 2014 Share Posted March 13, 2014 The alternator works by inducing current in wire windings... lots of them. The amount of current supplied to the battery when it's charging is huge. If you suddenly disconnect the load, it takes a short time for the magnetic fields to collapse back down to the level that runs everything else, and all that extra current goes to whatever the alternator is running. Link to comment Share on other sites More sharing options...
AeroNautical Posted March 13, 2014 Share Posted March 13, 2014 I see, I meant no harm by my suggestion, I just didn't know. Probably the reason it never fried my ECU when it happened was because the alt was shot, it barely made any current anyway. Guess I got lucky. Link to comment Share on other sites More sharing options...
MancheKid86 Posted March 13, 2014 Share Posted March 13, 2014 Since there is output in the alternator it is now self sustainable, the rpms and emf will produce enough current to run the truck and recharge the battery, there is also the fsct that it is wired in wirh a volatage regulator, Making this safe to do, no volatge regulator and youll fry stuff even with a battery Link to comment Share on other sites More sharing options...
gogmorgo Posted March 13, 2014 Share Posted March 13, 2014 Most of the time you will get away with it. Sometimes, though, you don't. It's not really a matter of getting lucky and having things work out, so much as you may get unlucky fry something. Recently manufacturers have started including protection system that shut everything down if the battery disconnects. The regulator won't protect things from such a massive spike. It's barely capable of cleaning up the flow from the alternator without the battery in there. It's a voltage regulator, not a surge protector. Link to comment Share on other sites More sharing options...
95wrangler Posted March 14, 2014 Author Share Posted March 14, 2014 Great Info Guy's. I'm still working-thu-it. Link to comment Share on other sites More sharing options...
95wrangler Posted March 14, 2014 Author Share Posted March 14, 2014 I did change the cps.The engine runs 10-15mins and shuts down.I did do the ground-refreash,Engine,dash,taillite. :dunno: Link to comment Share on other sites More sharing options...
cruiser54 Posted March 14, 2014 Share Posted March 14, 2014 What's your CPS output voltage in AC volts? Refreshed your engine bay connectors? Link to comment Share on other sites More sharing options...
95wrangler Posted March 14, 2014 Author Share Posted March 14, 2014 Will do as soon as possible.Thanks Cruiser. Link to comment Share on other sites More sharing options...
95wrangler Posted March 18, 2014 Author Share Posted March 18, 2014 Found-it! Bad coil-duh :doh: Link to comment Share on other sites More sharing options...
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