dukie564

Has anyone successfully wired up an extended idle switch on a manual transmission XJ? I've been searching for a definitive answer on this for a few days now and have come up with little info. I know it works on an automatic XJ by grounding an ECU pin, but evidently it has no effect on a 5 speed XJ PCM since the ECU looks for the transmission to be in park or neutral - which is impossible without a TCU and NSS according to others.

Is there a way to trick the PCM into completing the circuit on a 5 speed?

TheJerm

I'm assuming you want this for when your wheeling. Have you thought about a hand throttle?

dukie564

not only for wheeling, but to bump up my idle when I have a lot of electrical junk running - like when it's a monsoon outside and I have the rear defroster, fan on full blast, both wipers, headlights, foglights, and radio. My volts drop WAY down at stoplights unless I bring up the idle manually - kind of hard to do with a clutch setup.

dukie564

and yes I've thought about a hand throttle but don't like the idea of it being able to be bumped by my passenger

94cherokeeman

You should look into switching your alternator for one out of a 04 grand Cherokee 4.7

dukie564

a high amp GC alternator is in the "build plans" list already. I want this in addition to that. I have a 110 in there already another 26 amps won't make that much of an impact under full load.

TheJerm

Sounds like you need a better alternator, my voltage will dip when I turn on things but it never runs lower than 12v for more than a few seconds.

Ive been looking at doing a hand throttle and you can get a lockable hand control to set idle at 1500 to help start and use your foot when your moving.

dukie564

mm yea. Alternator is brand new about 10 months ago with new cables and terminals. 110amp model. Trying not to change it until i pick up a GC one or I kill this one with mud like the last.

Hand throttle is on my list for that reason, but wasn't planning on it quite yet.

Enough about my alternator - No one has a solution to the extended idle switching though???

Lifted98

have you tried pulling the ebrake? maybe the pcm looks for the ebrake for "park/nuetral"

dukie564

that's an idea but i doubt that would work

Littlethunder92

Any updates on this old topic? Im trying to do this on my 94. I have a factory ext idle switch also.

Lowrange2

He has a hand throttle now... lol

Your 94 is manual?

dukie564

yup i installed a hand throttle for wheeling, works if i need to bump up the idle a bit also.

https://www.cherokeeforum.com/f46/pr...6/#post1870509

s14unimog

That's what a Unimog uses; a hand throttle. Worked great - especially for warming the truck up, but obviously intended for the PTO. Just make it a point to tell your passengers, "DON'T TOUCH!"

dukie564

It's attached my my shift lever so they better not be touching that to begin with