99 eating PCM's - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 05-16-2014, 05:24 PM Thread Starter
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99 eating PCM's

ok guys I am at the end of my wits, I will give as much detail as I can although some seems non related.
1) I had a 200K 7.3L that was due for injectors, all 8 worked just wanted singles
2) I ordered 160/30 form PIS and tuning from Jody @ DP tuner.
3) install went good, but #5 was not firing. Swapped with #6 and its the cyl not injector.
4) wrung out harness to the IDM All good, reassembled. Still no #5
5) Heres where it gets weird, Replaced IDM and the truck started
6) AE says #5 low contribution and K Ram fault I can get codes from list if needed.
7) I get stupid, and wonder if the Tuner is causing me issues and "possibly" removed connector with key on and reinstalled. Not sure, I know better but it is possible. Truck will now not start at all. DEAD Remove PCM and open, Ram chip is blown.
8) order new PCM, Install, Batteries are disconnected for sure, Connect power and try to start PCM Fries within seconds and truck doesn't start. Remove PCM fired exactly as before. PCM is out now.
9)Found Junkyard PCM from 99 Van wrong code, DPC405, Install and don't install tuner, truck starts, runs and I am able to move it down road but of course it is not happy. But I need a baseline.
10) Disconnect batterys and install tuner, reconnect batteries and turn on key, NOTED no wait to start light, though gee I didn't see one the last time either, maybe I shouldn attempt to start or I will fry PCM.
12) Get my hands on a Rebuilt XLE4 thinking maybe it was just the tunner not liking the wrong PCM and that is why the Wait to start never lit.
13) without power install rebuilt PCM withou tuner, reconnect power, wait to start present and start truck.
14) Disconnect power and instal Chip, reconnect power and no wait to start.

I am absoultly sure the terminals are good and clean on both PCMs, in fact both have been retinned to ensure it.
Jodys website lists this a the problem most of the time.

now what? Is it possible the tner has a issue which could have fried both PCMs? I sure don't want to turn the key on one of these PCMs just to find out.

ANY HELP IS GREATLY APPRECIATED, my fifth wheel is stuck where its at and I need to get the truck up to get it.

Last edited by jester4always; 05-18-2014 at 11:15 AM. Reason: Changed for accuracy
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post #2 of 2 Old 04-15-2015, 10:58 PM
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Not sure if you've fixed the problem, but I had the same issue, the disconnecting of the tuner/chip with the key on, fries the tuner/chip, and any PCM that the tuner/chip is introduced to, will fry because of that

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William Boss
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1997 F-350 CCLB
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