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Old 12-16-2009, 04:14 PM   #1
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Question Jeep High Idle Switch

Hey I came across a " Extended Idle Switch" factory for jeeps. So I began researching and found out that XJ (Cherokees) were used as police cars and had a factory "extended idle switch" that when parked would raise the idle to 1000rpm... and the way it was achieved was that the switch grounded pin 12 on the PCM and it automaticly raised the idle to 1000rpm....now i've been searching and researching possiblity of installing such a switch for my TJ... but before I start wasting coutless hours of trial and error methods, I was wondering if anyone knows about this and if our TJ PCMs have this pin...ive checked the pinouts of our computers and front-to-backed the service manual, and came up with nothing..... anyone have any info? maybe know if it was done already?

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Old 12-16-2009, 05:06 PM   #2
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why would you want to raise your idle speed ?

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Old 12-16-2009, 05:12 PM   #3
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Police cars to idle no longer

Police cars to idle no longer | The Journal Gazette, Fort Wayne, Ind.

EXCERPT:
There are explanations. Older police cars used a different type of police lights, those bright flashing spotlights on the roof and in the grilles and back windows.

“The old ones would drain the battery in no time,” York said.

A car with a dead battery is pretty much useless, so the cars were left running.

But times have changed. Police cars now have lights that use a lot less electricity, so it’s not always necessary to keep a car turned on.

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Old 12-16-2009, 05:19 PM   #4
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OK After MORE searching somthing caught my eye....but i need someone with with a 4 cyl TJ to help me test my idea.....its easy nothing all that involved....anyone wanna help? no...ok well I came across that fact that the 4 cyl TJs have a Power Steering Pressure switch, all I need is for someone with a 4cyl TJ to do 1 thing to help me prove my point, you would need to connect a meter and read the voltage from the Power steering pressure switch and at idle in park turn the steering wheel untill the idle raises and tell me what the voltage reads...ANYONE?? PLEASE
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Old 12-16-2009, 06:05 PM   #5
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The XJ's (Cherokee) indeed had a police package for a few years. The extended idle swith and a rare column shifter were dead give aways the XJ had the police package. Check e-bay, every now and then I see one for sale there. Maybe the seller will help.
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Old 12-17-2009, 07:59 AM   #6
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Old 12-17-2009, 05:18 PM   #7
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RJSIMMS Thanks ofr the help but, thats just a switch, yes it will fit in our switch centers but without the XJ PCM its just a regular toggle switch.....what I really need is for someone with a 4 cyl to tell me what the voltage coming out of the power steering pressure switch is...... once I get that info....I will put up a write up of the greatest switch you can install in our jeeps.....but I need that info first!
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Old 12-18-2009, 02:40 PM   #8
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I wonder if it would be possible to use that idea, but bump the idle up to 1200-1500 rpms???
I need something so I can run my OBA at optimum rpm's as all the connections on my throttle linkage are used up. Guess I could rig something up and run yet another cable to it, but I think electrical is the way to go.
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Old 12-18-2009, 02:50 PM   #9
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show me a pic of where the pressure switch is and i'll check the V
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Old 12-18-2009, 03:20 PM   #10
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No need to make this more difficult than it is... simply install a hand throttle like is sold by Rubicon Express which can hold your engine rpms at whatever you like. I have one and it works well for that, in addition to how much help it provides when offroading to provide greater offroad control while minimizing drivetrain shock by eliminating problems caused by a foot bouncing on the accelerator pedal on rough terrain.
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Old 12-18-2009, 04:08 PM   #11
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Quote:
Originally Posted by Jerry Bransford View Post
simply install a hand throttle like is sold by Rubicon Express which can hold your engine rpms at whatever you like.
I would do this if I had a way to install it. My linkage bracket is full with the regular throttle cable and cruise control. Is there some kind of modification that I could do to add another cable?
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Old 12-18-2009, 06:22 PM   #12
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Quote:
Originally Posted by Jerry Bransford View Post
No need to make this more difficult than it is... simply install a hand throttle like is sold by Rubicon Express which can hold your engine rpms at whatever you like. I have one and it works well for that, in addition to how much help it provides when offroading to provide greater offroad control while minimizing drivetrain shock by eliminating problems caused by a foot bouncing on the accelerator pedal on rough terrain.
I looked it up and its actually pretty cool....but thats not quite what i intend to use it for......i'll elabarate further once i'm sure my idea will work...
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Old 12-18-2009, 06:35 PM   #13
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Quote:
Originally Posted by Loic View Post
show me a pic of where the pressure switch is and i'll check the V

I believe this is what it looks like....should be on the high pressure hose....cant find a picture and I dont have one on my jeep so I cant really show ya, but your P/S pump is on the drivers side when you open the hood, follow the hoses coming off the pump and you should see the sensor with 2 wires coming off

Also jerry when you adjust the hand throttle does it stay in position or is it like a gas pedel which returns to 0 position when you let it go?

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