High Idle Control


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AZgl1800
Posts: 1343
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: '02 GL1800

High Idle Control

Post by AZgl1800 » Fri Jun 29, 2018 8:07 pm



Many years ago, I had a vehicle ( can't recall if car or truck )
that had a throttle cable you could pull out of the dash to raise the idle speed just a bit to keep the generator running enough to keep the electrics going while I worked.

Now, I have a 2001 Suburban with the 5.3L ( 350 CC ) engine, with FI of course.
On our trip pulling the Toy Hauler and our two little 75 lb puppies
we had several occasions where we needed to leave the truck running to keep the doggies cool. Temps were in the high 90s at the time. ( we like to visit museums, etc and the doors will lock with a key ) and the dogs don't like strangers

Coming back to the truck, I did not like seeing the temp gauge nudging the Red Line.

Just touching the throttle and bringing the tach up to 1500 rpm brought the temp gauge back down to normal again.

I googled the world, and found 'GRIP' for fleet vehicles to purposely shut the engine down, if left idling more than 5 minutes.

Not what I want.... my son says to use a Popsicle stick under the throttle's perch...
uh, the engine is hot, I can't reach that far, and the throttle is covered with a "cover"

I need to just flip a switch, pull a cable out, something... and pop the hood of course.
.
any ideas?

my perfect idea is something that plugs into the CAN port and will tell the ECM to up the throttle a bit.


~John

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DenverWinger
Posts: 498
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Location: Denver, CO
Motorcycle: 1980 GL-1100 STD Vetter (2005-)
1993 GL-1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL-1000 (2002-2006) sold

Re: High Idle Control

Post by DenverWinger » Sat Jun 30, 2018 7:39 am

My '85 Jeep Cherokee has a little solenoid mounted on the carburetor that pushes out a plunger that nudges the idle from 750 to 1200 RPM when cold. There's also a pressure sensor in the power steering hydraulic line that senses the power steering working hard (like a tight turn on a 4WD trail) that also actuates the plunger so the steering doesn't drag the engine down. It also activates when the A/C compressor comes on. A screw in the end of the plunger allows to adjust the RPM when actuated.

Your Suburban is probably too old to have a "Drive by Wire" throttle, if somebody was a little inventive could probably figure a way to make a bracket and mount such a solenoid to the throttle body on your Suburban to nudge the throttle. You could activate this with a switch. Voilà.

Maybe another alternative would be to start pulling vacuum lines one-by-one to see if you can find a vacuum line that raises the RPM if you pull it off. This would mess with the mixture, but if just sitting there idling you probably don't care. You could "Tee" in an electrically operated vacuum valve like we have on our Goldwings and create a "Vacuum leak" when you throw the switch to activate it.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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Alan_Hepburn
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Joined: Sat Jun 11, 2016 10:56 am
Location: San Jose, Ca, USA
Motorcycle: 1994 GL1500SE with a California Sidecar

Re: High Idle Control

Post by Alan_Hepburn » Sat Jun 30, 2018 2:02 pm

AZgl1800 wrote:
Fri Jun 29, 2018 8:07 pm
Now, I have a 2001 Suburban with the 5.3L ( 350 CC ) engine, with FI of course.
Actually, the 350 cid engine is actually 5.7L, not 5.3L...
Alan Hepburn - San Jose, Ca
1994 GL1500SE with a California Sidecar

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AZgl1800
Posts: 1343
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: '02 GL1800

Re: High Idle Control

Post by AZgl1800 » Sat Jun 30, 2018 9:40 pm

Alan_Hepburn wrote:
Sat Jun 30, 2018 2:02 pm
AZgl1800 wrote:
Fri Jun 29, 2018 8:07 pm
Now, I have a 2001 Suburban with the 5.3L ( 350 CC ) engine, with FI of course.
Actually, the 350 cid engine is actually 5.7L, not 5.3L...
yeah, I get problems like that a lot, after Penske's 18 wheeler ran over me in 2008, my memory cells are pretty much worthless.
I know where I keep getting the '5.3' part, it is the
VORTEC 5300 V8 6.0 quarts (5.7 L) [ had to look it up in my notebook ]

found a solution, going to use a Vernier Throttle control cable

https://www.finditparts.com/products/14 ... ts-vcgtx06

.the 2001 year is a cable controlled TBI setup,




~John

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