Leave idle at 720 when a.c. not in use winter - JeepForum.com
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post #1 of 11 Old 12-05-2019, 01:48 PM Thread Starter
agear
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Leave idle at 720 when a.c. not in use winter

Wondering if I should turn my idle down since I wont be using a.c. in the winter ?


1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #2 of 11 Old 12-05-2019, 02:10 PM
jeepdaddy2000
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Your AC should have a solenoid on the carb that is activated when the AC is turned on. With the AC off, the idle should be regulated by the curb idle screw. If you are having to readjust the curb idle screw to compensate for the AC, then the solenoid isn't working.
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post #3 of 11 Old 12-05-2019, 02:12 PM
John Strenk
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Sure, just remember you probably be using your lights and heater more so keep an eye on your voltage.

I usually kick mine up a little when I plow because of all the lights and raising plow and running heater at full power.

Check the voltage at the battery under your full electrical load. Do NOT trust the voltmeter on the dash. Important thing is the charging voltage at the battery.


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post #4 of 11 Old 12-05-2019, 02:53 PM Thread Starter
agear
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Quote:
Originally Posted by jeepdaddy2000 View Post
Your AC should have a solenoid on the carb that is activated when the AC is turned on. With the AC off, the idle should be regulated by the curb idle screw. If you are having to readjust the curb idle screw to compensate for the AC, then the solenoid isn't working.
I have a jeep air aftermarket a.c. system and the weber 38. I'm sorry if you cant see my profile. I dont know where to update it. It's a weber 38 with electric choke but other than that nothing electrical hooked up to it that I know of. I also did the nutter bypass
Thank you

Quote:
Originally Posted by John Strenk View Post
Sure, just remember you probably be using your lights and heater more so keep an eye on your voltage.

I usually kick mine up a little when I plow because of all the lights and raising plow and running heater at full power.

Check the voltage at the battery under your full electrical load. Do NOT trust the voltmeter on the dash. Important thing is the charging voltage at the battery.
Okay so battery voltage should be at what when the jeep Is on with the heater, wipers and lights on ?

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #5 of 11 Old 12-05-2019, 03:50 PM
John Strenk
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Anywhere in the 14 volt range would be good.


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post #6 of 11 Old 12-05-2019, 03:57 PM Thread Starter
agear
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Quote:
Originally Posted by John Strenk View Post
Anywhere in the 14 volt range would be good.
Thanks john. I'm reading a good book about electricity right now.

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #7 of 11 Old 12-05-2019, 04:39 PM Thread Starter
agear
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Quote:
Originally Posted by John Strenk View Post
Anywhere in the 14 volt range would be good.
. I'm not at 14. I'm at 13.8 I'm sure it goes up when I give it gas.
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1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #8 of 11 Old 12-05-2019, 06:02 PM
jammer1
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13.8 under a full load is fine.
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post #9 of 11 Old 12-05-2019, 08:13 PM
keith460
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Quote:
Originally Posted by agear View Post
I have a jeep air aftermarket a.c. system and the weber 38 with electric choke but other than that nothing electrical hooked up to it that I know of.

That's the whole idea of an Idle Up Solenoid that your OEM Carter BBD had from the factory, it bumps up the idle anytime 12V was supplied to the A/C compressor clutch. 12V ran to the Idle Up Solenoid at the same time and a small rod moved against the throttle linkage to bump it up some. The rod out of the Idle Up Solenoid is adjustable also so you can set the rpm to your hearts desire.


If you still have your old Carter BBD laying around, look for the Idle Up solenoid and get a little creative to fab up a bracket so it can be used on the Weber 38. The bracket used on the Carter might work for this purpose.
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post #10 of 11 Old 12-06-2019, 06:03 PM Thread Starter
agear
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Quote:
Originally Posted by keith460 View Post
Quote:
Originally Posted by agear View Post
I have a jeep air aftermarket a.c. system and the weber 38 with electric choke but other than that nothing electrical hooked up to it that I know of.

That's the whole idea of an Idle Up Solenoid that your OEM Carter BBD had from the factory, it bumps up the idle anytime 12V was supplied to the A/C compressor clutch. 12V ran to the Idle Up Solenoid at the same time and a small rod moved against the throttle linkage to bump it up some. The rod out of the Idle Up Solenoid is adjustable also so you can set the rpm to your hearts desire.


If you still have your old Carter BBD laying around, look for the Idle Up solenoid and get a little creative to fab up a bracket so it can be used on the Weber 38. The bracket used on the Carter might work for this purpose.
That's pretty neat. I cant see half the pictures on here but thank you for sharing this !

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #11 of 11 Old 12-07-2019, 09:00 AM
pedal2themetai
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HI, not sure for the 84 but (I think some are set at like 900 or something like that)... most idle specs. are 750 in N for an automatic to make up for the drag of the transmission and 650 in N for a manual. That's the way I've set stuff for ever (1960).
good luck
tim
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