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Old 07-08-2019, 09:01 PM
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Default 2 blown IDMs, after hydra chip install

I'll try to make this short with enough information. Bought a used '99 f350 with busted rings and a bent pushrod on #5. Block and heads rebuilt, lots of shiny and go fast parts and Hydra chip. Finally try to start, just cranks. Troubleshooting pointed towards IDM. Swapped with a buddy, no chip this time. Buzz test passed. Truck started but sounded a little aggressive or rough at idle, not sure which. Shutdown, disconnected batteries, pulled the key, installed hydra chip, second IDM fails. If the PCM was flashed previously, could the hydra chip tunes be causing this with the stacked programming?
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Old 07-08-2019, 10:36 PM
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There is no such thing as stacked programming. I would be looking for electrical shorts, testing voltages etc. You can send your IDM to Swamps and they may be able to pinpoint where it failed and why and repair your IDM. Are you absolutely sure the IDMs failed?
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97-250 7.3 Eaton TVS Supercharged, S369sxe, R&D IDI performance T4 mount, my B350/200s, Honey Badger SR with My tunes, BMW M3 seats, Sky 5" RSK skyjacker drop pivot brackets, Sky shackles and hangers, Toyo M/T

1948 GMC Detroit 453T
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Old 07-09-2019, 05:57 AM
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On first star, a 7.3 is going to be very rough. Lots of air in the HPoil system.
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Old 07-09-2019, 06:23 AM
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I followed the pin tests for the IDM harness off of Alldata. Everything read fine, but definitely not ruling out a short. I'll send the first IDM out and see if I can get some info on failure point.

I know first start will have lots of air in the HPO system. Maybe it's just my mind reading more into it.

Just trying to get some fresh idea
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Old 07-09-2019, 07:48 AM
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Personally, I would run it with no chip until I got all the air cleared out and checked for leaks, a retorque of the head bolts, etc. Stick a scanner on there and make sure everything is up to snuff. Then put the chip in. Double check the connector on the PCM and make sure you have it cleaned off well. Careful, don't remove the tinning. Good luck and keep us updated.
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Old 07-09-2019, 10:39 AM
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Thanks SuperPSD and Arisley. Sounds like a good way forward. I'm starting to think it's terminals on the PCM not being clean enough for the hydra. After all this writing and calling I've down, it seems a little obvious that the hydra was the only variable. Im going to run through wiring again, whole harness, inspect the PCM connection for the chip, and go from there. Does anyone know if the connections between the PCM and hydra will kill the IDM or would damage stay local to the PCM? Just trying to plan ahead. Can never have to many spare parts if everything checks out ok. I'll update as I troubleshoot
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Old 07-09-2019, 08:05 PM
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So IDM definitely fried. Old harness had fractures on VC connectors but nothing obvious or dangerous looking. Either way, have another IDM I'm picking up tomorrow, a new"er" wiring harness, im going to plug everything in and do some more voltage, resistance and continuity checks before I think of starting. Hopefully 3rd IDM is a charm. I'll post a pic of IDM damage as soon as I figure it out
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Old 07-09-2019, 08:07 PM
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IDM burn
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Old 07-09-2019, 08:28 PM
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Ouch. Swamps diesel may or may not mbe able to repair your toasted IDMs.
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97-250 7.3 Eaton TVS Supercharged, S369sxe, R&D IDI performance T4 mount, my B350/200s, Honey Badger SR with My tunes, BMW M3 seats, Sky 5" RSK skyjacker drop pivot brackets, Sky shackles and hangers, Toyo M/T

1948 GMC Detroit 453T
1951 Mack A51T
1916 Federal 1 1/2T
  #10  
Old 07-10-2019, 05:03 AM
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What kind of shape are your under valve cover harnesses in. If you have to replace them, DO NOT use ones from parts stores. Most of these are made by Dorman and completely suck. Buy either Ford or International.
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