JefCooks Posted December 28, 2022 Author Share Posted December 28, 2022 I replaced the crank pos sensor this evening and am charging the battery to make sure I get good signal. I'll let you know what happens in the AM. Link to comment Share on other sites More sharing options...
JefCooks Posted January 4, 2023 Author Share Posted January 4, 2023 So I got everything figured out. The "upgraded" alternator that I put in was bad and causing a short in the system (I think). One of times the truck started and ran I put the multimeter on the PDC and once the truck died, the voltage started dropping down to ~8V. The battery is new and didn't show any physical signs of being bad, all the new cables were properly grounded, all fuses were good, I had good fuel pressure at the rail and good spark but only sometimes. So it was an intermittent spark problem. I replaced CrankPS, ThrottlePS and CamPS along with new distributor, cap, rotor, plugs, plug wires and coil. My neighbor (a mechanic) mentioned he had a customer with a similar problem once they installed a high output boat alternator that "everyone on the forums" said would work but didn't and caused a bunch of other problems. So I swapped out my old alt and it's been 100% since then. Link to comment Share on other sites More sharing options...
MiNi Beast Posted January 4, 2023 Share Posted January 4, 2023 Well that's good... Link to comment Share on other sites More sharing options...
cruiser54 Posted January 4, 2023 Share Posted January 4, 2023 Parts these days................ Link to comment Share on other sites More sharing options...
zomeizter Posted January 5, 2023 Share Posted January 5, 2023 Hey Jeff, which upgraded alternator did you use? I recently installed a Dakota 160 amp into my 01 XJ and so far so good... Link to comment Share on other sites More sharing options...
JefCooks Posted January 12, 2023 Author Share Posted January 12, 2023 It was a 120A for a v8 zj. Had to grind the brackets a little but nothing too serious. Link to comment Share on other sites More sharing options...
Eagle Posted January 12, 2023 Share Posted January 12, 2023 How old are the spark plug wires? Have you tested them for continuity and resistance? Link to comment Share on other sites More sharing options...
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