Please Help... ICP Mod Idle Relay
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Joined: Sep 2010
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Please Help... ICP Mod Idle Relay
I apologize in advance I have searched this to death and have found allot of contradictory ways to wire up a 10k/18k icp resistor mod. I wired in a 22k resistor inline and it seems to run real good now. Just a quick puff of smoke at wot. Lots better throttle response. I've had trouble reading all the posts deciding who's got obs and who's got the new body style and who used what resistor. So I didn't know what value to use. Ended up with 22k, idle now sucks. Doesnt sound lopey to me it sounds more like it's hitting on 4 or 5 cylinders.
Finally... my question is how do I wire in a spst switch into the ivs relay so I can have a normal idle once again.
Also is the 22k going to harm the icp?
Thanks in advance. My apologies for being long winded.
Finally... my question is how do I wire in a spst switch into the ivs relay so I can have a normal idle once again.
Also is the 22k going to harm the icp?
Thanks in advance. My apologies for being long winded.
Hotshot
Joined: Jan 2011
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From: Puget Sound
This mod may have been a "redneck chip" when these trucks were newer, but now it's just another way to confuse things when it comes time to troubleshoot the vehicle as it ages.
Just my opinion.
Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
I had that mod (10k) many years ago before having a programmer/custom chip. I used a this 0.5-Amp SPST Reed Relay at 12VDC : Relays | RadioShack.com connected to the idle validation switch to control the resistor to come in "off idle". I may still have the wiring, with the relay, still in my parts cabinet. I used to have a diagram of the wiring on my Webshots account, but was deleted and is no longer available.
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Well this mod is redneck but it costs a dollar and gains about 50hp/100ft lbs of torque and about 2mpg if you keep your foot out of it thanks to the higher injection pressures.
Can I wire it to look like this
Icp sensor --> 22k resistor --> relay -> other side of icp wire.
The relay will be triggered by the ivs voltage. This is a spst relay. At idle the icp circuit.would be grounded. Second you step on the go pedal it kicks in.
Can I wire it to look like this
Icp sensor --> 22k resistor --> relay -> other side of icp wire.
The relay will be triggered by the ivs voltage. This is a spst relay. At idle the icp circuit.would be grounded. Second you step on the go pedal it kicks in.
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
Take very detailed readings of your fuel economy before and after - so you can be the "resistor guru" if it bumps your economy.
One thing to watch out for: Increasing ICP on old oil lines and injector O-rings can make you want to check your oil level. A lot of good it does to increase fuel economy if fuel is traded for oil burn.
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It's a Van Gogh
Joined: Feb 2010
Posts: 7,812
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From: Elk Grove, CA
Yeah that's what I thought, the 10k mod, which is pretty much old and busted. If you want more horses get some real tunes on there. Tunes change more parameters and even transmission performance, so you get a lot more out of it. A Superchips flash on there is better than a 10k mod, or step up a bit for a 6 position switch or DP Tuner, lots of ways to go. You get what you pay for here. For the price of 2-3 tanks of fuel you can get good tunes.
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Lead Driver
Joined: Jun 2004
Posts: 6,337
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From: Amarillo, TEXAS!
The 10k and all other resistor mods kind of went out the window when the diode clamp mod was introduced. The clamp mod is ICP sensor safe, and I believe even Cody (Cleatus12r) has said it's fine to run it. I still have it on my truck to this day, but I can't seem to find a wiring diagram for it anymore. I'm sure it's still out there somewhere; my Google-fu must be weak today . . .
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