Computer Problem?
#1
Computer Problem?
I went to start my truck today and I let the glow plugs cycle, it only needed about 2 seconds since it had been run earlier. When I went to start the truck it acted like it had a dead battery and would not crank. The batteries have been weak but I turned the key off and turned it back on to run and the door alarm beeped quietly and in a weird pattern. The check engine light also flickered but would not come all the way on. I ended up trying to start it and cycling the glow plugs a few more times, and then it just started normally. Should I be worried about this? Maybe my IDM or PCM is going bad? It did rain last night so could there be water in one of the computers?
#4
#6
I will run to Advance tomorrow to have them load tested. They were bought in 12/13 so they shouldn't be too bad, although I do plow which wears them out much faster.
#7
Got the batteries tested and the alternator too. All passed. Had about 650 CCA I think. Alt also passed but I dont know the number. I havent checked the chip yet. I cleaned the terminals but found that some of the connections were loose enough to wiggle off by hand. Would that make my truck not start like it did? I also want to mention my radio also reset when this happened.
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#10
#11
The chip/PCM wouldn't have any effect on cranking. The starting circuit is completely electromechanical, with no tie to the engine control. You could bury a hatchet in the PCM and the engine would still crank with the key. You have a voltage/connection problem. 650 CCA sounds low for the batteries, but that would only cause the starter to crank slow, not a complete no-crank.
#12
I agree with madpogue. I had batteries checked a few months ago because I thought they were getting weak. They tested good, but the tester said that one of the batteries had only 25% of its life left. (I'm not sure how they calculate that.) So I replaced it and it was obvious that was a weak battery.
#13
Also check your connections at the starter. We find those connections to be worst of all in the system.
EDIT: I re-read and see what you mean. With bad PCM the truck will still crank, just not fire up. Gotcha. At least when chip/PCM get fried, too.
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'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
#15
I agree with madpogue. I had batteries checked a few months ago because I thought they were getting weak. They tested good, but the tester said that one of the batteries had only 25% of its life left. (I'm not sure how they calculate that.) So I replaced it and it was obvious that was a weak battery.