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Author Topic: No spark. 75 ramcharger 318 HUH? (FIXED!!!)  (Read 7188 times)

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Offline 3jvj

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No spark. 75 ramcharger 318 HUH? (FIXED!!!)
« on: February 22, 2010, 07:26:13 PM »
My buddy lost spark last week, and we haven't found it since.  We threw a coil, new ballast, known working distibutor at it.  What's next on the list?

Any help is appreciated.  Thank you.  Josh
« Last Edit: March 1, 2010, 10:25:43 PM by joe s »
74 power wagon swb 440/435/205 Forest Circus Green
01 Durango 5.9
73 fj55
63 fj40

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Offline s ǝoɾ

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Re: No spark. 75 ramcharger 318 HUH?
« Reply #1 on: February 22, 2010, 07:41:09 PM »
My buddy lost spark last week, and we haven't found it since.  We threw a coil, new ballast, known working distibutor at it.  What's next on the list?

Any help is appreciated.  Thank you.  Josh

Replaced the wiring harness yet? They go bad too!  ;)

In all seriousness, like I said yesterday

Want to measure/test the components or keep guessing?

Most of the above mentioned parts have several test specs.

For example:

  • pickup coil to reluctor airgap: .008" BRASS feeler gauge
  • pickup coil resistance: 300-800ohms UNPLGGED
  • pickup coil continuity to distributor base: "OL" from either pin to base UNPLUGGED
  • pickup coil voltage while cranking: ~.5 volts AC from ground to orange or brown wire
  • ignition coil primary resistance (small terminals): .75-.81ohms UNPLUGGED
  • ignition coil secondary resistance (+ terminal to coil tower terminal):10-11,000ohms UNPLUGGED
  • ballast resistor resistance: ~1ohm UNPLUGGED
  • voltage drop from positive post to input side of ballast (terminal NOT leading to coil): <.300v DC

There are a few other test specs, but the above method is usually cheaper/easier than replacing everything repeatedly.

Personal recommendation is throw that junk away, step up to gm-hei module swap. Just personal opinion, disregard that. Just not a fan of mopar box.

Notice ALL resistance tests above have ALL wires disconnected from the device being tested, and NONE of the above tests involve ohms on any wires.

Means do not bother doing continuity test on wires, and do not test coil/pickup/ballast with any wires attached. Erroneous results may occur

Avoid replacing any part that you have not proven to be faulty through extensive testing.

Offline 3jvj

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Re: No spark. 75 ramcharger 318 HUH?
« Reply #2 on: February 22, 2010, 07:49:16 PM »
It's a great place to start.  Thanks Joe.  I dug two pages back but didn't see your list; super handy.  I'm going to print a copy to keep in the glovebox.

Went rounds with the volt meter before we threw parts at it; that's why I assumed it was the distibutor.  All the other stuff tested out, that's why I recommended his pick-up in the distributor (he had a spare so he threw the whole thing in).  He's going to throw a pcu at it next.
74 power wagon swb 440/435/205 Forest Circus Green
01 Durango 5.9
73 fj55
63 fj40

Blah, blah, blah; Obama. ::)

Offline s ǝoɾ

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Re: No spark. 75 ramcharger 318 HUH?
« Reply #3 on: February 22, 2010, 08:05:57 PM »
If that pickup is not spaced proper distance from "star wheel" (reluctor) the pickup won't generate a signal. A non magnetic feeler is required for accurate results. Brass is preferable.




Coil testing:


Basic schematic:




(if you have a 5 pin module with 4 pin ballast, there is a extra wire or 2) Can convert to 4 pin module.

If module is bad, I much rather throw in the GM-hei stuff. Permanently remove the ballast from the picture. Ac Delco D1906, $15@ www.amazon.com



Avoid replacing any part that you have not proven to be faulty through extensive testing.

Offline 3jvj

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Re: No spark. 75 ramcharger 318 HUH?
« Reply #4 on: February 22, 2010, 08:18:22 PM »
Bomber info Joe; thanks a bunch.  If he goes hei I'll do a how to write up on it. 
74 power wagon swb 440/435/205 Forest Circus Green
01 Durango 5.9
73 fj55
63 fj40

Blah, blah, blah; Obama. ::)

Offline s ǝoɾ

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Re: No spark. 75 ramcharger 318 HUH?
« Reply #5 on: February 22, 2010, 08:19:46 PM »
3jvj this response right here is why I recommend the HEI module as opposed to that gooey melting stock box on the firewall.

installed home grown HEI this eve first crank it fired and ran like a champ.. I dont know why anyone would stay with that crappy esc. I know it fires hotter. I dont have my windshield in yet as its a project truck.. i was in the cab and adjusting the timing yesterday and got bite by the esc, no biggy. well after installing the HEI coinversion ( been drinkin too) I was dfoing the same thing and BAM I got my dick knocked in the dirt... boys let me tell ya that home grown HEI bites hard... my truck cranks and hits everytime now.. I love it thankls to you guys for the info..


Direct any specific questions to that dirt cheap mod here:

READ CAREFULLY
Avoid replacing any part that you have not proven to be faulty through extensive testing.

Offline 3jvj

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Re: No spark. 75 ramcharger 318 HUH?
« Reply #6 on: March 1, 2010, 10:22:46 PM »
Fixed.  I wish I could say which one fixed it but in the process of throwing the items on it my buddy swapped the coil wires.  Once he swapped them back to where they should have been it fired right up.  In the end I think he had a bad pick-up his dizzy.  The truck runs better than it ever has.

Thanks again Joe.
74 power wagon swb 440/435/205 Forest Circus Green
01 Durango 5.9
73 fj55
63 fj40

Blah, blah, blah; Obama. ::)

Offline s ǝoɾ

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Re: No spark. 75 ramcharger 318 HUH? (FIXED!!!)
« Reply #7 on: March 3, 2010, 12:38:36 AM »
I like these things:
http://www.amazon.com/Thexton-THX404-Adjustable-Ignition-Tester/dp/B001DUP5SI/ref=sr_1_4?ie=UTF8&s=hi&qid=1267594808&sr=1-4


Not a specific brand per say, just in general.

Sure you can ground a plug to the fender, but sometimes it will show a spark but still won't fire under compression.

That is because it may only take a few hundred volts to jump a .035" gap in open air, but may take 20,000 volts+ under compression.

A 20,000+ volt spark needs to be able to jump several inches in open air. I don't think you want to be on the receiving end of a shock at those distances. (leaning too close to fender)  :o

A resistance test works pretty good on coil/plug wires. One of the only times I recommend doing a resistance test on a wire.
Avoid replacing any part that you have not proven to be faulty through extensive testing.

Offline 77yellowdog

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Re: No spark. 75 ramcharger 318 HUH?
« Reply #8 on: June 6, 2012, 07:49:35 PM »
If that pickup is not spaced proper distance from "star wheel" (reluctor) the pickup won't generate a signal. A non magnetic feeler is required for accurate results. Brass is preferable.




Coil testing:


Basic schematic:




(if you have a 5 pin module with 4 pin ballast, there is a extra wire or 2) Can convert to 4 pin module.

If module is bad, I much rather throw in the GM-hei stuff. Permanently remove the ballast from the picture. Ac Delco D1906, $15@ www.amazon.com



What is the wiring diagram for the AC Delco 1906? and what all does it replace? Thanks
Thanks!

Offline pir2

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Re: No spark. 75 ramcharger 318 HUH? (FIXED!!!)
« Reply #9 on: June 7, 2012, 05:32:10 AM »
This is a pretty old post also.
It replaces the ignition module and ballast resistor.
Check these threads for info:
http://duster318.freeservers.com/tech/hei.html
http://ramchargercentral.com/technical-discussion/hei-conversion-blaster-coil-mounteed-module-bracket-mounted/
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Re: No spark. 75 ramcharger 318 HUH? (FIXED!!!)
« Reply #10 on: June 8, 2012, 01:11:38 PM »
heres the chevy vortec W motor coil and ECM mounted on one bracket / the wiring diagram is below that / ikts the HOT setup for a DODGE

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Offline 77yellowdog

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Re: No spark. 75 ramcharger 318 HUH? (FIXED!!!)
« Reply #11 on: November 21, 2012, 11:16:08 PM »
I cannot clearly read your GM handwritten notes can you type them out here?

I used a good battery had spark truck started, then after thinking it was discharging. took it out and tried old battery reading 12.5 volts after a recharge and good test at Advance Auto.

Brought battery home and it seemed to crank and go down to 12.5v

No no spark, which I did have and battery seems to drain

Rewired the 8 way crimp with a shrink tube back in June.

8-way is between the dist, coil, and ballast resistor.

Did work, instrument panel not working but dash lights do.

Question is if batt is down to 12.5 would it throw a spark?

Put in new cam and the timing calls for 5 degrees ATDC

Did #1 thumb spurt test and damper lined right up to zero with dampener's 5ATDC mark,

Headlights working were bright but semi dim now.
Thanks!

 

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