Power Strokes 1994-1997 Upgrades and AftermarketUpgrading or adding OEM or aftermarket equipment to your 1994-1997 Ford F-Series with Power Stroke engine.
I just thought I would post this to save some people a little trouble.
I just did the IDM Mod on my 1995 PSD which has the 100a IDM. Once I looked at the circuit board I realized that the factory resistor would be a pain to remove. I cringe at some of the blogs I've read where some guy scrapes the factory resistor off with a screw driver, there are about 150 different ways to ruin your board doing that. I happen to work for the world's largest micro-chip manufacturer so I took the board into one of our labs and had a tech look at it. He brought it to me an hour later with the new resistor soldered on....Here's the time saver part.... He didn't remove the old resistor, he just soldered the new one on over it so the new one is effectively a bridge across the original resistor.
So if you're bound and determined to do this yourself don't risk messing your IDM up with a screw driver. Either get the right tools and de-solder the old resistor or just solder the new resistor right over the old one.
errr....this only works if he cut through the old resistor, taking it out of the circuit.
Otherwise, you'd be putting two resistors in parallel, meaning the net resistance would wind up considerably less. (for non-ngineers, google "parallel resistors" for the formula and explanation )
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'94 F250 supercab 4x4, original owner, 4.10LS, DIY elec fuel, Tymar air intake, Adrenaline HPOP, Beans tunes on 4 position VA chip, VDO gauges (boost,pyro, outside temp), Ford digital AIC, DPPI downpipe, gutted EBPV and turbo pedestal mod, Con OFE clutch, add-a-leafs front and rear, Monroe Reflex shocks, Milemarker 449SS hubs, towing 25' Mallard travel trailer
errr....this only works if he cut through the old resistor, taking it out of the circuit.
Otherwise, you'd be putting two resistors in parallel, meaning the net resistance would wind up considerably less. (for non-ngineers, google "parallel resistors" for the formula and explanation )
Good catch, I did forget to mention that he scribed through the old resistor taking it out of the circuit.
I'll ask how he did it, but I stand corrected here. The stock resistor pops off pretty easily with a fine screw driver or knife. I got excited because people on several different sites make this mod sound easy, my intent was to discourage someone who has never soldered before or worked with small electronics from grabbing a screw driver and messing up their board.
I'll ask how he did it, but I stand corrected here. The stock resistor pops off pretty easily with a fine screw driver or knife. I got excited because people on several different sites make this mod sound easy, my intent was to discourage someone who has never soldered before or worked with small electronics from grabbing a screw driver and messing up their board.
I agree with you, I think is possible to mess the board doing in that way, and I think doing in the way you posted its easy, and Im planning to do it like that, thats why I asked about how the scribe through was made. I wait for your answer.
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