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75 CJ5 not firing

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75 CJ5 not firing
Travis4x4

Travis4x4

Jeeper
Posts
51
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5
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Location
Rossville, GA
Vehicle(s)
75 CJ5 258 4.2 all stock except it has 80 intake and 2 barrel carb and rough country lift
Ok I went out to take the jeep for a ride and it wouldnt start.:confused: So I started my investigating to find the problem. I fount that when I was turning the switch over the ballast resistor was smoking so I changed it. Still nothing. I checked the coil and it had weak fire so replaced it. Still not firing. Why:confused:. It ran fine before this. Now the only thing I have done right before this was put a clutch in it. And now it won't start. Someone help me. I love my jeep and it is dieing. Oh yea it just burnt the new resistor:mad: Why
 
You have points right? Have you looked to make sure they were gapped correct?

Sounds like they may be too tight and you are getting power all the time with little gap for "spark"

Just my 2c / idea...

Lets start there at least...

Also,

Any Mod willing to move this to Drivetrain? May get better responses there..


No worries man, We'll / You'll get this figured out. :cool:
:chug:
 
If you have points, this might help...

What i do:

Remove the distributor cap. It wont start now (although thats your issue) so don't worry about it starting... block the tires and put in nuetral.

Now either with a buddy or a bump start push button, or screw driver on ignition module bump the engine until you see the point of the part shown below make the points come apart...
mump_0605_14_z+how_to_rebuild_a_distributor+removing_the_ignition_points.jpg


when the edges of that "hex" looking part move it should move the points out too. If you have a feeler guage, almost anything will run good @ .016
but check your book for sure... If you have said book, you can probably find better instructions there or with google search too.

But i adjust the points until the feeler guage gos in and out with a little resistance, but does not push the points further open.

Then tighten, replace cap, and good to go...

Basically as I am sure you know to start you need 3 things:

1 Spark
2 Air
3 Fuel.

Got to be one of those 3 things...

Give us some more info maybe to try to help more...

:chug:
 
Smoked the ballast resistor?
If the wattage or resistance it too low it will fry. Are you sure you have the correct ballast resistor?
 
Well I tryed to bypass my ressistor and still no fire
 
Well autozone tryed telling me that my jeep didn't call for a resistor I told them it did and they give me the only one they carry so he said. The resistance wire in the new one was longer and skinnyer.

BusaDave9 said:
Smoked the ballast resistor?
If the wattage or resistance it too low it will fry. Are you sure you have the correct ballast resistor?
Click to expand...
 
ok I just ohmed out the resistor it has 1.0 ohms. I pulled the distributor cap off and the rotor button had some build up on the end of it . I cleaned it the points looked fine, Now I looked in side the cap and noticed just to the side of every little metal peace it was burnt like it it firing right before it gets to the metal. any ideas on that
 
First off are we sure it's an ignition problem. Have you tested to make sure it's not getting a spark. Are we sure it's getting gas.

As for the point, cap and rotor. They do get burnt corrosion on them when they are still good but if you don't know when they were replaced last you should replace them.

Check the positive side of the coil. It should have 12 volts when the ignition switch is on. The jeep doesn't need to be running and you don't even need to have the engine cranking. Just turn on the key and check the + side of the coil.
If you do have 12 volts on the coil and it won't make a spark you should check the resistance of the coil. Disconnect the wires from the coil. You should have only 1 ohm on the primary. Check this by putting your leads on the + and the - of the coil.
The secondary should have 8000 to 18000 ohms. That is from the big output in the center of the coil to the -.
8852CG01.gif
 
Ok i will go check right quick be back in a few and it is getting gas.
 
ok i'm getting 12v and resistance is good its getting gas
 
Sorry Travis,

I'll have to do some research on this: ballast resistor
I have no experience with that part... (or maybe I do but not by that name... :cool:

Either way, I assume you have tracked down to for sure spark issue.

I also assume you have double checked all ground connections as well as battery cables, and power connections between the whole starting circuit.

If not start there. I hate wiring issues, because the only way to find them is to start from one side and work towards the other...

I'll try to do some reading tonight on that resistor, and hopefully have another Idea by tomorrow.

Also, Not that I mind you PM'ing the questions to me, I don't, but you should keep the answers / comments here on the thread so everyone can see them. I, as well as Dave, will receive notifications already when you post back here on this thread too.:cool: That way everyone, and trust me there are more knowledgeable folks here by a mile than me, Like Dave for one :notworthy:, who will see this and help you through if they have an idea...

:chug:
 
Okay, so if the voltage and resistance at the coil checks out fine and we still don't have a spark Then the problem is in the distributor (or a connection between the coil and Distributor)
We do have a new cap, rotor and points, don't we? If so double check the points adjustment.
 
:popcorn:

Any updates travis?? Hope you may have found your grimlen?
 
JR74CJ5 said:
:popcorn:

Any updates travis?? Hope you may have found your grimlen?
Click to expand...
Not really been working haven't had time to fool with it much. But I am getting good fire now and getting gas. I pulled the plugs out and they all smelt like gas. Some one told me they could have got gas soaked and if so they aren't any good any more. but any way it still isn't starting up. Any more ideas?
 
Were there any changes done to the engine?
 
changed intake and carb to a 2 barrel but thats been over a year ago the only recent thing is were I put new clutch in. Now there is and have been a lot wires that aren't hooked up But they haven't been since I've owned it And it did run just fine. I dont know bout the spark plug thing where one guy said they got gas soaked and messed them up because I remember when I was a kid my dad would clean the one in the lawn mower with gas and then put it back in soaking wet with gas and fire it right up. But it may be different for a vehicle.
 
Ok update. I have now changed the plugs and still nothing. :mad: This is really aggravated. This makes no sense
 
At first we thought we weren't getting a spark. I'm not so sure anymore. The problem must be either missing spark or missing gas. If you worked on the distributor and the timing is way off then it wouldn't start but it doesn't sound like that is the issue.
Let's take a step back and try to make sure we know if it is a spark or a gas problem. Lets not replace anything until we are sure where the problem is.
 
Ok I got it to back fire once and it is spitting back through the carb now. But thats all I have got it to do
 
Oh yea I did put new cap rotor points and condensor in it. Checked the timing its right and have turn my distributer 180 degrees.
 
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