High Idle switch

So as anyone knows, when using a winch or compressor, anything that draws high amperage, it's best to rev the motor slightly to allow the alternator to run faster than idle speed. A lot of 3/4 ton and 1 ton trucks have a high idle switch to bring up the revs when using such equipment. Has anyone been able to mod the Tacoma to have a high idle switch? I looked but found nothing.

 

i like the idea

 

Subd. I would like to find a way for this as well. I know some aftermarket programmers give you the option but they don't always make it easy. I had an Aeroforce in my Jeep and it had a high idle option but it took a number of steps to get through the menu and actually turn it on.

My first thought was to measure the resistance through the accelerator pedal. Then find a pot with the same range, wire it in and adjust it to the RPM I would want. Then measure the resistance through the pot at that setting. Then wire up a switch with a regular resistor in line so that when you flip it you get the high idle.

Then I though why not just wire a switch and a pot so that when you flip the switch, the pot becomes your accelerator and you can dial your idle up or down accordingly... I'm sure there is more to it. I have only dabbled in electronics a little and it was a late night idea when I thought about it...

 

I think that is a great idea. I would think that someplace the ecu would CEL do to some unknown feedback it got from moving the resistance/ voltage up without the pedal moving.

 

That's why I figured a pot to mimic the pedal. Maybe I'll start looking into this again. Lol. Been awhile.

 

It comes down to if you have drive by wire or still have a cable.

10 years or so ago I had a plan to build one using the cruise control I had everything all figured out turned into another project never finished.

since never used the cruise control .

 

If it's a 2nd gen and drive by wire, it uses 2 hall effect sensors. You'd have to interrupt that circuit and supply the linear range specified here. If they are out of range from each other it will set a DTC and if you interrupt both for a certain length of time it will go into "limp mode" because it doesn't know the position and will default to a fail safe. Your best bet is to see if someone makes a tuner like they do in the diesel world that will have an idle up setting.

Sensor one voltages:
Released 0.5 to 1.1 V
Depressed 2.5 to 4.5 V

Sensor two voltages:
Released 1.2 to 2.0 V
Depressed 3.4 to 5.0 V

 

I'm not sure but do these trucks have a switch/ sensor that kicks up the idle when you turn the wheels (power steering)? Some vehicles do. That may be a sensor to use. I really never noticed on my manual transmission version.

 

No, the older trucks did the steering pump had a vacuum line that would cause it to idle up when you turned the wheels at a stop.

 

The pump does have a sense on it. I have a new pump on mine and I was unsure of what to do about the old sense wire....


edit.. i have reviewed the wiring diagram and it looks like i can switch that to ground. im not sure now many more rpms it will gain but i will report back

 

i think were over thinking this..

why not put a T in a good vacuum source and put it to a solenoid? like this:

$10 Plum Garden 1/4" DC 12V 2 Way Normally Closed Electric Solenoid Air Valve, Stainless Steel

https://www.amazon.com/4inch-Normal...=B074Z5SDG3&psc=1&refRID=JZ8HYGYR8M4QA3A79GKE

 

i oreded this ..https://www.ebay.com/itm/NEW-DUAL-S...GE-TURBO-BOOST-CONTROLLER-BLACK-/362233973226

not entirely sure how this will work. if its only a 2 way switch than i plan on clamping the low side and switching to the high boost side as my vaccum leak side. i figured this way i should be able to dial down some rpms if full open boost leak is to much.

 

ok that was a fail. i should have pulled a vacuum line before ordering a 50.00 boost controller.. vacuum leak didn't work as expected. also grounded the wire on the ps pump and it only gave me 100 rpms

 

Any thought to using a hand throttle (https://www.tacomaworld.com/threads/hand-throttle-write-up.425494/ @Wheelspinner ’s writeup) instead of an electrical high idle switch?

 

Brick

 

I had this exact thought in the shower last night.. I dont really have any interest in messing with critical electrical components or trying to trick the ECM into seeing a different pedal position like above. (Id like to avoid a worst case scenario of a stuck wide open throttle)

So I was thinking why not something physical..? My first thoughts were like a servo motor up under the dash that would active via a switch and engage the pedal via some linkage mechanism. Simple on-off, and it would have a hard stop that would prevent it from going above whatever RPM you wanted. But it could be as simple as a stick with some velcro on it. Push it into the pedal and stick it to the trans tunnel
Either way this is something I want to look into more when I have time later in the fall.

 

If you are not interested in tampering with the trucks electronics and don't mind mountain man simplicity, place a brick on the accelerator. You'll have to experiment with weight and position, but you can get the idle rpm you desire once you have that figured out. Fast to activate and even quicker to deactivate.

 

A random brick in the cab + high speeds on dirt roads sounds even worse than a stuck WOT imo..

The simplest solution I had thought of was just a piece of dowel rod velcroed to the trans tunnel But like I said, something much more elegant should be easy enough to come up with once I have some time

 

It was my impression the truck was idling and needed some extra rpm

 

Yup, just saying I dont want to carry a brick around until I get stuck and need to winch out. Rather toss something small in the glove box or whatever