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Discussion Starter · #1 ·
The Haynes manual says that the electric choke consists of thermostatic spring and cover(choke assy), temperature sensing switch, and a ceramic(positive temperature coefficient)heater. 2 questions...what wire hooks to the choke assy? is it a splice off the red with white stripe going to the coil? also, where is the temp sensing switch and ceramic heater found? the engine is a AMC 360

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JK
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78CJ5 360
 

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/wwwthreads_images/icons/smile.gif Actually, I think that all the things that you mentioned are INSIDE the choke housing. Most of those are fed from a three-pole oil pressure-activated switch. The two outside poles connect upon oil pressure rise and feed the auto choke heater/wwwthreads_images/icons/smile.gif The heavy red(not the coil feeder....a red from the firewall group)wire from the ignition "on" circuit feeds the oil pressure activated switch./wwwthreads_images/icons/smile.gif

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 

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Discussion Starter · #3 ·
I had a gut feeling that that three pole switch attached to the oil pressure switch had something to do with the equation, but I wasn't sure what. So, let me see if I understand what you are saying...the heavy red wire would go to the middle pole on the switch and then one wire would run from either of the outside poles (because they both do the same thing...activate on oil pressure rise) to the choke housing. When the engine is warmed up, and oil pressure drops, does that switch cut off the 12v's? Also, do you know what the other pole was for? Appreciate the help CJDave

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JK
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/wwwthreads_images/icons/shocked.gif No! No! Don't DO that. The center pole goes to (-) when oil pressure drops. It is for an "Idiot" light if you so desire. There should be a green wire in the firewall wire loom that is supposed to feed the three-pole switch. If you look in there you may see it. It is 16 Ga wire. So you can run the Grn 16 Ga wire TO the outside terminal(either one) and then AWAY from the other outside terminal and TO the choke heater. They only used this on certain Jeeps with Transmission-Controlled Spark, if I'm not mistaken. The center wire can ground a lamp or buzzer to indicate low oil pressure(actually NO oil pressure) we are using the center pole for that very thing in our CJ.....an oil pressure buzzer which quits when oil pressure comes up.....plus a light too...in addition to the gauge./wwwthreads_images/icons/crazy.gifThe three-polw switch holds as long as oil pressure is there. When the choke heater gets hot enough I BELIEVE there is an internal switch in the choke heat assembly that opens the circuit.

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 

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Discussion Starter · #5 ·
Got it...appeciate the help! and I am glad you replied because I might of done just what I said previous. Neither Haynes nor Chiltons mentions this switch we've disscussed. If your assumption is correct and the choke assy has a cut oof switch in it, then isn't the bottom line 12v applied to the choke when the key is placed in the run position...i.e. I could get 12v from anywhere to make that choke work...but I like the idea of a buzzer and or light and may do that...thanks again.

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JK
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/wwwthreads_images/icons/smile.gif As one of my more astute moonguys/wwwthreads_images/icons/wink.gif pointed out.....you DON'T WANT the choke heater to heat the choke until the engine is actually running. Like if you flipped on the key and just sat there, you would not want the choke to heat up...pull off...and not be there to give you a good startup. SO....they used OIL PRESSURE....a sure and certian indiaction that the engine is running. Oil pressure is used in MANY applications...Caterpillar uses it to start the alternator charging...it is often use to kick out the A/C clutch until after the engine is started...LOTS of things. We have a ten-unit relay group set up for our CJ, and a crapload of the circuits depend on oil pressure, like the FOG LIGHTS, the A/C clutch, the rear defroster, the theft system disables fuel if the engine starts, oil pressure rises, and the theft system is still on "safe", and oh yeah, the alternator is energized by a relay which is oil pressure dependent./wwwthreads_images/icons/crazy.gif

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 

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Discussion Starter · #7 ·
Sounds like you have a pretty mechanically impressive CJ...After I sent the last message I thought about it, and decided, for the same reason that you indicated, I would run the choke off that pressure switch. I also found the green w/tr wire that suppiles the power...thanks again for the help. Just one more question...do any of your moonguys know what fuse that grn w/tr wire might go to in the fuse block? kinda hard to tell in Chiltons.

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JK
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/wwwthreads_images/icons/laugh.gif You should see this team of moonguys/wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/tongue.giftaking a magnifier to the wiring diagram! They claim.....get this.....that circuit is shared with the cigar lighter, and is live all the time? You had better verify that some way./wwwthreads_images/icons/crazy.gif

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 

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Discussion Starter · #9 ·
The moonguys are correct! confirmed with the trusty multi-meter...in fact, as it turns out the choke, carb soleniod, cig lighter, and reverse lights all come together and run through the fuse marked "trans-kick down". This is interesting because I have a T150...guess it just goes to show the interchangability AMC used with many of the Jeep parts. My carb came off a Wagoneer, I should be able to take off that carb soleniod, correct? what does the moonguy crew say about that and the purpose of the soleniod? would they do it? Thanks again!

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JK
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78CJ5 360
 

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/wwwthreads_images/icons/tongue.gif There are two things which the little moonguys/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/wink.gifsaid you may be calling a carb solenoid....the bowl vent solenoid valve in the bowl vent hose....if so equipped......OR...the fast-idle solenoid. KEEP THAT ONE...it will come in handy for high idle situations like winching, warming up, keeping up with headlights while doing repairs...and pumping with A/C or on-board air. You can have a switch to kick it in./wwwthreads_images/icons/crazy.gif We have that on our CJ and will use it when the A/C compressor kicks in./wwwthreads_images/icons/smile.gifYou can get rid of the bowl vent solenoid, however.

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 

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Discussion Starter · #11 ·
I was refering to the fast idle solenoid...BTW, tell the moonguy crew thanks for all the help. The electric choke runs through the oil pressure switch and works like a charm! in fact, now that I have power running through that circut, I now also have reverse lights and a C-gar lighter, that I haven't had for well over a year. Now getting back to the fast idle soleniod...does this solenoid kick on and off on its own? or do you have to run a switch to it. I like that idea for all the reasons you said, but wondered when and if it was supposed to kick off on its own.

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JK
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/wwwthreads_images/icons/smile.gif NOW....we are getting into real technical mumbo jumbo. You see, when certain types of combustion chambers were developed, they would sometimes get a little corner that would get a nice hot carbon deposit or maybe even the head itself would be hot enough to cause RUN-ON.....that annoying thing that makes engines run after ignition shut off....also called "dieseling". SO....what they did was set the butterflys in the carb to ZERO to deprive the engine of air so it CAN't diesel. They used the idle solenoid to OPEN the butterflys to a predetermined idle setting while the switch was on, and everything would be normal. As soon as you shut off the switch, you lost the idle setting and the engine HAD to quit for lack of air. We use those idle solenoids with a dash switch to get an ON-DEMAND high idle for various things like running the alternator faster while winching, warming up in winter, the list is endless./wwwthreads_images/icons/crazy.gif Hey...these moonguys/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/wink.gifare hard to beat.

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 

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Discussion Starter · #13 ·
Great advice...I am going to run a switch as discussed to give me that high idle on demand. Well, guess this closes another chapter in "Operation CJ"...thanks to you and the moonguy crew my Jeep is better off now than it was when we started this thread. There is some good info on this thread, hope others were watching so they could benefit. Until next time...later

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JK
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/wwwthreads_images/icons/smile.gif One of my senior technical moonguys/wwwthreads_images/icons/wink.gifjust blew in from Toledo and he was reading over my shoulder. He says to tell you that the "normal" idle will be adjusted with the idle solenoid and the switch off. You move the solenoid to adjust the idle setting. Naturally you will have to move it toward the throttle arm to get normal idle, then the solenoid will automatically give you high idle when energized. This moonguy/wwwthreads_images/icons/wink.gif also says he and all his moonbuddies/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/crazy.gif want a ride in your helicopter/wwwthreads_images/icons/crazy.gif

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 

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Discussion Starter · #15 ·
Absolutely! You and the moonguys have a free pass good for one round trip around, Homoland, Bear lake, Barstow and anywhere else you want to go. We will pump so much CO2 into the air that the greenies might hopefully inhale enough that it causes them to vote R in NOV. You know we used to get out your way about 3-5 times a year but haven't been that way for a few years now. Tell the crew to standby...jk

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JK
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78CJ5 360
 
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