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Old Sep 12, 2008 | 12:52 PM
  #1  
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c00n mod

i tried the 10k, 14.7k, 15.6k and 20k. what is the cause of a rough idle with the higher OHM's? what can be done to smooth it out?
 
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Old Sep 12, 2008 | 01:26 PM
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the higher resister's fool the PCM to the point that it can't compensate for the abnormaly high IPC at idle ,,how high can you go without issues ?..

cOOn will Know more ...
 
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Old Sep 12, 2008 | 01:28 PM
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Don't think of it in terms for what others have used as well.

I'd get some so you can mix and match to get the desired resistance that works best for you.
Others 20k has worked good, or 15.6. Etc.

Good Luck
 
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Old Sep 12, 2008 | 02:24 PM
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14.7k seemed to be the highest without a rough idle. i havent drove around w/ each only cuz i'm at work and i wanted to see which idled smooth. maybe when the truck warms up completely it will idle better with the higher ohm's.
 
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Old Sep 12, 2008 | 02:26 PM
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w/ the 20k in it idled pretty rough but i didn't get much smoke. definatly runs like a raped ape at higher rpms though.
 
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Old Sep 12, 2008 | 05:12 PM
  #6  
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he he ya it's a fun mod.
the truck will idle higher and smoother once warm but the higher ones may still be rough.
when mine is cold, it idles like a cammed gasser...
 
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Old Sep 12, 2008 | 06:23 PM
  #7  
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this here will smoothen out your idle... it equalizes the oil pressure between the heads. KCM S.S. HPX Line (94-97)
this is an older link so they might be cheaper somewhere else, but you get the idea.. good luck!!
 
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Old Sep 12, 2008 | 11:14 PM
  #8  
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ok so now i've drove around w/ each and the truck fully warmed up. w/ the 14.7k, the truck acts like there is a govenor @ 2700rpms and w/ the 15.6 it acts like a govenor at 2300rpms... no more go. just holds at 2300 and very very very slowly climbs up. even the 10k mod paused at 3000 and then climbed slowly. i thought this mod just increased the oil pressure a little and that my chip would advance the timing. i tried w/ the chip on and off. not happy w/ the performance. i do have the stock hpop though. would that hold me back?
 
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Old Sep 13, 2008 | 09:20 AM
  #9  
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its possible, might be fuel related as well. mine does exactly what you describe when i run the 22k. i have not had time to diagnose the exact concern. i need to hook up gauges to see which system is being over taxed. every 10k is approximatly 200 psi increase if i recall.
 
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Old Sep 13, 2008 | 01:55 PM
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If you're running a chip, you most likely don't need this mod. The chip should be tricking the PCM the way we're doing it with the resistors.

I've had my truck on the chassis dyno (DynoJet) twice now, with the different resistor combinations. The first time on the dyno, I thought I might have some tranny or TC slippage. The second time on the dyno confirmed that.

I'm running a 15.6K resistor at the moment. Search for "ICP Resistance Mod Results" (or something similar) and you should find my results. One thing I found out is, EVERY truck will respond to this mod differently. If you don't get on the rollers, you won't know for sure if this mod is working for you or not.
 
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Old Sep 13, 2008 | 02:00 PM
  #11  
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This is the link to my thread.

https://www.ford-trucks.com/forums/7...d-results.html

Post #36 has the most recent chart. I goofed...I typed "15.5" instead of "15.6" on one of the results.
 
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Old Sep 13, 2008 | 03:22 PM
  #12  
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Originally Posted by IDMooseMan
If you're running a chip, you most likely don't need this mod. The chip should be tricking the PCM the way we're doing it with the resistors.
so maybe the chip and resistor together is like workin against itself? i was hoping it would be similar to stacking chips. i ordered a HPOP from Midwest Fuel Injection today so maybe that will help ease my diesel power hunger for a while.
 
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Old Sep 13, 2008 | 03:27 PM
  #13  
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my 14.7k idles a little rough. i think i will be dropping down to 10k when i get the chance.
 
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Old Sep 14, 2008 | 10:48 AM
  #14  
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JMO ,,but I always thought , what ever you add to the bottom ,,you will loose at the top ...PCM thing ....
 
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Old Sep 14, 2008 | 12:37 PM
  #15  
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i run my icp mod with the chip, works great, you feel the power loss when you remove the icp mod. i lose no top end power at all. the largest increase is low-midrange though.
 
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