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Ranger & B-Series All Ford Ranger and Mazda B-Series models

98 4.0 Interiment Missfire

 
  #31  
Old 05-15-2019, 11:39 AM
dpeterson3
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I would check, but I ran down the battery trying to get it restarted. Would not try when the wrecker driver tried a jump pack. I am going to get a new battery later today since the one in it is bad. I had it checked right before the truck died adn it came back as having bad cells. Its 5.5 years old. I am thinking now that it could be low enough its sucking enough power trying to start that the PCM isn't getting enough to stay alive and start the engine. Either way, I won't have codes since I pulled all the fuses and relays in the box (including PCM memory) to clean them in case that was the problem. Had to be on date night when my wife was already afraid it wasn't reliable too.
 
  #32  
Old 05-15-2019, 12:56 PM
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Good idea to replace the battery if its giving problems, as it can cause the computer, ignition & fueling systems to act out.
Be sure to use your smart charger to top up the new battery before installing it, then check out the charging system under load, to make sure its able to keep things happy.
 
  #33  
Old 05-16-2019, 09:04 AM
dpeterson3
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Something electrical failed for sure. Got a new battery this morning, and still no joy. I don't hear the fuel pump prime or relays click open, so I think its probably something in the master power path to the main fuse box or pcm power line. I would use a smart charger and do some load tests, but I don't own one. Can't have someone else do it since the truck won't start. Going to start back probing the power paths and see what I come up with.
 
  #34  
Old 05-16-2019, 09:39 AM
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Check the condition of the battery cable end connection lugs & clamps. No corrosion where the wire strands go into the end fittings. Perform voltage drop testing on the wiring run of Both B+ & B- cables & make sure the B- cable is making a good connection to the engine block & body. Also check the B+ cable fuse link to make sure it isn't blown, or has a faulty high resistance connection, maybe do a wiggle test on the cables to see if things suddenly wake up from a faulty connection. Seeing as we only have 12 volts or so to work with, All connections need to be clean, bright & tight.
Let us know what you find.
 
  #35  
Old 05-16-2019, 10:33 AM
dpeterson3
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Found my power problem. When I fixed the minor injector issue I had a couple of days ago, I got the noise cap wire stuck under the coil pack and cut the insulation. Over time, it vibrated over to a screw and grounded out to the frame. It happens to be on pcm power relay and spark plug circuit, so it blew out the fuse preventing the engine from running. Cut the bad section and spliced in a new wire, so that's one gremlin down. Next is the power steering leak. Going to change the oil while I'm at it. Mercon V or type F? I can't seem to find a consensus on which to use. Thinking F since I already have some on hand.
 
  #36  
Old 05-16-2019, 12:25 PM
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Ok, good find, fix, feedback & to hear the no run seems fixed.
On the power steering fluid, refer to your owner manual call out for the prope power steering fluid. My 99 specifies Mercon-V, so that's what it gets every 30K miles when I do a full fluid pump-out / fluid exchange in the tranny & power steering systems..
 

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