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Unread 07-11-2013, 07:52 PM   #1
Dwarf
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76 with no spark - please help

Hey guys,

I have a 76 with no spark as tested with the lighted spark tester at the plug and the coil to distributor. Everything worked when I parked it a month ago, but now it turns over strong but no spark. So the solenoid is good. What is a good method to test the connections between the solenoid and coil?

I don't have a bulb tester, but I do have a voltmeter. I appreciate the advice. I've read a hundred posts on here but can't find anything for my setup..yet.

Thanks,
D

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Unread 07-11-2013, 08:11 PM   #2
pman
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The wonderful "JeepHammer" wrote up some good testing procedures when Ken had a no spark condition a couple of years back:

http://www.jeepforum.com/forum/f8/25...spark-1045702/

Hope this can point you in the right direction!
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Unread 07-11-2013, 09:18 PM   #3
Dwarf
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Thanks Pman. I am doing this solo. It's frustrating that these probes all have just a point.
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Unread 07-11-2013, 09:37 PM   #4
Dwarf
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So - with a voltmeter, not a bulb - I have over 12 from the coil out put to ground. Leading me to think he distributor has an issue. Does that sound reasonable? When cranking there is still consistent voltage from coil output.
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Unread 07-11-2013, 10:33 PM   #5
Dwarf
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Well the resistance between the pos and neg terminals is only 1.8 ohms. Not 1.8k, but 1.8, so I think the coil is ok.
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Unread 07-11-2013, 10:36 PM   #6
CSP
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Sounds like the Prestocrap ignition is living up to its pseudoname.

Honestly, don't spend another minute or a dime figuring it out. The ignition used on '75-77 CJs is pure junk. I ditched mine fifteen years ago for an HEI distributor and have never looked back.

The above link with Jeephammer's troubleshooting is applicable to the '78 and up CJs with the Duraspark ignition. The OPs has Prestolite if it's original. It's easy to identify as the vacuum advance canister on the distributor will be plastic.
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Unread 07-11-2013, 11:27 PM   #7
Dwarf
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Vacuum advance is tin / metal. The distrib is clean and new from po. If I have resistance of 1.3-1.8 at the coil, how do I test it further?

Here's the coil: https://picasaweb.google.com/Pullen....94951704450018
Distributor: https://picasaweb.google.com/Pullen....95001225831586
And the mess of wiring the po left me: https://picasaweb.google.com/Pullen....95067835761618

Thanks for the replies
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Unread 07-12-2013, 03:00 AM   #8
BagusJeep
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It looks like a later Ford distributor but it is a heeeeecccccck of a mess under that hood.

Could I suggest you take the distributor cap off and take a pic of what is under there?

I see various unconnected plugs, stray modules and all sorts under that hood. It is not clear whether you have an electronic Duraspark ignition, points or some PO special. At least the good news is that it is not Prestolite.
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Unread 07-12-2013, 07:46 AM   #9
CSP
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That's good that someone else beat you to getting rid of the Prestolite! That is definitely a Duraspark distributor and you can follow that link referencing JH's troubleshooting.

The only real troubleshooting to do regarding the coil is whether it's sending spark or not to the distributor. Focus on the ignition module and then the pickup coil in the distributor. Most likely it's the module or possibly the wiring since you have that mess going on.
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Unread 07-12-2013, 12:04 PM   #10
LumpyGrits
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WHY are all those electrical plugs uncovered?
Any water get's into them, and it's "Short-city".
LG
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Unread 07-12-2013, 07:18 PM   #11
Dwarf
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I have no idea what those plugs go to. On one hand, I think the jeep was originally a EFI. It's an 87 by title, with a 76 motor. But the 87 s didn't come with EFI, but this thing looks like it had a bunch of computer stuff.

I want to clean it up and remove the unused wires, but I'm not quite sure where to start. It's a weekend jeep for me, and I have no intentions of selling it, and don't need ac, etc.

At this point I just want to drive it. I got it in may, a week later the internal slave crapped out. I broke the exhaust bolts removing the ax15. ( Yeah - po had already upgraded tranny) Then found broken bolt in cylinder head. Machined the head, exhaust and intake, did a valve job and replaced rockers, thermostat, clutch, rear main seal and all the other gaskets, oh and did an external slave conversion. I appreciate all the tips and advice from you guys here.

Good lord, can something actually function on this thing!?!?
I'm considering calling it project "coming to Jesus" for all the promises I've made The Lord at this point.
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Unread 07-12-2013, 07:33 PM   #12
LumpyGrits
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No CJ's were made after early 1986.
No CJ ever had OEM, EFI.
LG
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Unread 07-12-2013, 08:02 PM   #13
pman
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Quote:
Originally Posted by CSP View Post
The above link with Jeephammer's troubleshooting is applicable to the '78 and up CJs with the Duraspark ignition.
CSP, thanks for pointing this out. I feel like a moron for not realizing dwarf may have been running the prestolite ignition.
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Unread 07-12-2013, 08:48 PM   #14
Dwarf
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It's a yj originally. Apparently the po swapped in a 76 from the engine block codes.
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Unread 07-12-2013, 10:27 PM   #15
BagusJeep
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An 87 YJ could have come with the carbed AMC258, a lot of them did. Injection arrived a few years later when the 4.0l was installed.

What you are seeing under there is a mess but may be the emissions control gear. This was computerised.

The AX15 box I think came in in 1989, so that is also non-original.

However not all is lost as you have a fairly simple mid 70s motor with manual box. There are relatively few electrical circuits needed in the engine bay to drive the 258- ignition, lights, horn, main power harness and electric choke come to mind.

As to your distributor, it looks Ford but may not be Duraspark, you need to look under the cap to check if it is points or sensor and then find the ignition module if it has a sensor. (Some POs put in old fashioned points, in the day we all wanted to replace them with sensors) A 4 inch square ribbed aluminium box with two plugs is hard to miss, it may even say MOTORCRAFT on it if a genuine Ford item.

If you can find that box and it has a 2 way and 4 way plug you can troubleshoot it using the Jeephammer posts.

If you find something else, take a pic and post it up.
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With a Jeep every prayer counts.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1995 Cherokee 4.0 - CHEROKEE
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