85' CJ Ignition problem - JeepForum.com

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post #1 of 24 Old 09-02-2012, 08:40 PM Thread Starter
msgrogan
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85' CJ Ignition problem

Driving down the road the other day and heard a loud backfire and lost compression. Had it towed back to the house and finally started working on it today. Just bought this Jeep about a month ago so wasnt expecting much trouble because it was in solid condition.

The engine turns over and has ignition for a split second. Seems like its starving for fuel. Pulled the breather and the fuel pump is pumping gas to the carb. Just replaced the fuel filters and hoses today. I also checked the pump again when I had the filters off. So I'm thinking carb?

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post #2 of 24 Old 09-02-2012, 08:53 PM
86cj74.2L
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Do you have spark as long as your turning over engine, or only for a moment then nothing?
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post #3 of 24 Old 09-02-2012, 09:01 PM
gojeepin
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If it's pumping gas to the carb, you have a different issue. There's not much involved with a carb... gravity, vacuum, and venturi are about it. I doubt that it would be running then suddenly die from a carburetion problem if the carb was getting fuel.

Have you checked for spark?

Vibration? Bump steer? Wandering? Read the article (sticky) on Steering, suspension, and driveline.
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post #4 of 24 Old 09-02-2012, 09:45 PM Thread Starter
msgrogan
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Don't have much experience with older vehicles. I'm trying to read the service manual online now. So I need to be looking for a spark inside the carb? Or should I pull the plugs, clean them and see if I'm getting a spark from the plugs to the wire? I have poured a bit of gas in the carb to see if the carb wasn't getting enough gas. The best I got was a puff of white smoke..haha.
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post #5 of 24 Old 09-02-2012, 09:48 PM Thread Starter
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Let me rephrase part of that last comment. I little to no experience with any vehicle besides normal maintanance! Just want you to know what your dealing with.
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post #6 of 24 Old 09-03-2012, 12:06 PM
SavSilvrCJ
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I just went through this this morning. When I replaced the solenoid I never reconnected the I terminal on the solenoid and it would crank and want to start but then would die like it wasnt getting fuel. I hooked up the I terminal and she stayed running. Dont know if this is your problem but it wouldnt hurt to check those wires.

WFO baby!!!!!
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post #7 of 24 Old 09-09-2012, 11:29 AM Thread Starter
msgrogan
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Alright second day of working on the jeep down. I do have spark on each plug. What I've done so far is to replace fuel pump, fuel filters, solenoid, distributor cap, plug wires, plugs just to be safe. I have the same problem as before. So now I think I need to rebuild the carb...which is only $30.
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post #8 of 24 Old 09-09-2012, 12:25 PM
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Quote:
Originally Posted by msgrogan View Post
heard a loud backfire and lost compression.
You've got spark, you've got gas.

Checked your timing and done a compression test?
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post #9 of 24 Old 09-09-2012, 12:25 PM
DougE
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Check the suggestion by SavSilvrCJ. Do you have wires on both spade terminals of the starter solenoid? The ignition terminal energizes the coil when the starter is cranking. If the engine fires up while cranking and then stops, check that there is 12v to the coil when the ignition switch is on.
You need air, fuel and spark.
Pull the air cleaner off - you know air is getting to the engine.
Crank the engine while spraying starting fluid in the carburator - if it runs you know you have spark.
If it stops running when you stop spraying - you need fuel.

1983 CJ7, 258I6, T4, Dana 300, 2" Lift, 31x10.5x15 DuraTrac
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post #10 of 24 Old 09-10-2012, 12:31 AM Thread Starter
msgrogan
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I need the engine to run to check timing? Don't have a compression tester. You think I should rule out compression before I attempt the carburetor?

Well I have 12v to the ears of the solenoid. Don't have 12v on the screws that point toward the engine. I have the ignition switch on. Did you mean 12v when the cranking the motor? The reason I ask is because I just replaced the solenoid and I doubt it would be bad. I guess I could have picked up a bad one.

I'll have to pick up starting spray this weekend.
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post #11 of 24 Old 09-10-2012, 08:41 AM
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When you look down the throat of carb and move throttle to wide open do you see gas squirting out the accelerator pump holes?

Your going to need engine running to set and or check timing.
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post #12 of 24 Old 09-10-2012, 12:06 PM
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Sounds like it jumped time. Thats when you chew up the timing sprocket and it won't run. It will also bend push rods break internal components and other wise mess up your day.
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post #13 of 24 Old 09-10-2012, 05:23 PM Thread Starter
msgrogan
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Yes, fuel does squirt into the carb when throttle lever is pulled or accelerator is pushed

If the timing sprocket was broken, wouldn't I hear banging noises? Can this be checked without Taking apart the engine.
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post #14 of 24 Old 09-11-2012, 11:25 AM
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Maybe, maybe not. Some of the OEM timing chains had plastic teeth and they would grind down it wouldn't make a lot of noise. You can pull the timing chain cover and look at it while in there you could check the alignment of the timing marks.
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post #15 of 24 Old 09-11-2012, 12:22 PM
mluatc
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check and make sure your tach is hooked up properly there should be 2 leads a red and whit and a red going into it there is also a orang which is for dash illumination and black for grounding if this the red wire and the red and white wire aren't hooked up or something like that this can cause you jeep not to run it sounds like it wants to run when you turn it over but as soon as you come off the crank position with the key nothing
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