High Idle Stays On At Operating Temp.

[rsaltaresjr]

1994 7.3 IDI Factory turbo automatic transmission 2wd. The high idle solenoid is getting voltage continuously even at full operating temperature. I have to unplug it to get it to retract. I haven’t had a chance to trouble shoot it. Any of you fellas had this happen before? I’m guessing there is a thermo sensor/switch somewhere on the block that may be shorted to ground. Any ideas?

 

[homelessduck]

The sensor that controls it is directly behind the thermostat housing . Stubby little 2 prong sensor. It also controls the cold advance..

 

[rsaltaresjr]

Ok, I vaguely remember that when I replaced the thermostat a few years back. Thanks a lot. Any one have opinions on what brand to replace with? Should I stick to motocraft/international stock or will any parts store brand will do?

 

[homelessduck]

It isn't a critical part so I am sure any brand would be fine. Of course Motorcraft/International is always best. You could also run it to a toggle instead so you would have manual control of it, which is what I'm about to do.

 

[79jasper]

For the price, I'd go toggle switch. Lol
For these sensors, it's likely even the motorcraft brand has been sold out. Probably not much difference in quality.

Sent from my SM-G892A using Tapatalk

 

[rsaltaresjr]

I’m really liking the toggle idea. Just like the old big rigs had. I knew y’all would come through for me. Thank you kindly.

 

[icanfixall]

So far everything posted bout this is true. No parts store will have this sender. I tried nappa and all the others. Finally went to a pick n pull wrecking yard and got 3 of them... They are very expensive thru international or ford dealers too. you can simply unplug this sender and not have cold fast idle or cold advance.Your engine will still run fine. A note about the fast idle solenoid. Sadly they are not strong enough to open the throttle so we have to press down on the throttle peddle so they advance the idle on startups.

 

[rsaltaresjr]

Found the hot wire insulation melted a couple inches obove the sender. It was grounding against the thermostat housing which I’m sure is what melted it. Cleaned wrapped and rerouted the wires away from the hot thermostat pipe. Ops check is normal. Thanks for all the helpful advice.

 

[madpogue]

Expensive? For future readers, they're $35 at AutoNation White Bear Lake - E8TZ-9E939-A .

 

[icanfixall]

Expensive? For future readers, they're $35 at AutoNation White Bear Lake - E8TZ-9E939-A .

Good to know but round these parts there are non of these parts stores.

 

[madpogue]

Good to know but round these parts there are non of these parts stores.

Not around here, either. Or anywhere else, except White Bear Lake MN, wherever that is. Not that it matters.

 

[Thewespaul]

I really like a manual switch for the non 3g alternator trucks, if you need to jump another truck or running an accessory that pulls a lot of amps you can set the truck on high idle so the alt can help out more since the 1g alt doesn’t put much out at idle

 

[79jasper]

Interesting. Everywhere else it's near $60-70.

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[OLDBULL8]

Not around here, either. Or anywhere else, except White Bear Lake MN, wherever that is. Not that it matters.

Just North of Minneapolis. Used to be Tousley Ford. Been There.

 

[Cubey]

Does the switch normally stay open when cold? (As in, “off”, if it was a toggle switch)