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Unread 04-05-2013, 10:51 PM   #1
OilfieldCowboy
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D.U.I. HEI Install Problems

87 258, Nuttered, TBI'd.

Installed the DUI, hooked positive direct to battery post, 12.4v at the distributor. Cranked the engine, fired right up, ran smooth for about 5 seconds, started smelling frying electronics. Killed the engine, now there is no spark.

Is there any idea on what burned up? We are all guessing that the coil in the HEI is what got fried. I'm hoping I can just hit NAPA in the morning and get a new one, but I won't hold my breath on that one.

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Unread 04-05-2013, 11:53 PM   #2
timatoe
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Napa will have a new coil. Don't know what or why anything would've fried though.
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Unread 04-06-2013, 08:58 PM   #3
OilfieldCowboy
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Turns out its a fuel issue. What wire from the OEM ignition module do I need to supply power to so my fuel pump will run?
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Unread 04-06-2013, 10:54 PM   #4
timatoe
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I don't remember what wire it is and didn't realize you had a Howell setup. Check out their website, they have the install instructions right there, that should help with the troubleshooting.
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Unread 04-06-2013, 11:54 PM   #5
OilfieldCowboy
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Another question, what all can I remove from the OEM Duraspark ignition wiring when swapping to an HEI? Module is a no brainer on the removal. I obviously did not research this project enough prior to ordering. Don't normally do that.
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Unread 04-07-2013, 12:38 AM   #6
OilfieldCowboy
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Helps if I look through some of JeepHammers unbelievably awesome posts:

Quote:
Originally Posted by JeepHammer View Post
You can control the "Low Current" switching to the relay, which is what you see above.
The Ignition switch controls the HEI relay low voltage trigger power,

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Unread 04-07-2013, 11:50 AM   #7
timatoe
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Quote:
Originally Posted by OilfieldCowboy View Post
Another question, what all can I remove from the OEM Duraspark ignition wiring when swapping to an HEI? Module is a no brainer on the removal. I obviously did not research this project enough prior to ordering. Don't normally do that.
I run a relay to mine like the above pic. As for the ignition wiring,,,,, the only thing I left was the 12v signal that I ran to the relay. Otherwise everything (other than tach) that was part of the original system was cut out and removed.
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Unread 04-07-2013, 12:02 PM   #8
OilfieldCowboy
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Found this in the CJ forum:

Quote:
Originally Posted by CSP View Post
Since you've removed the original ignition those "purple wire" instructions aren't applicable any longer. All that you have to do is connect the white wire that, IIRC, goes to the negative post of the coil to the "TACH" terminal on your distributor. Ignore the stuff about the purple wire and the splices.
Connected the white wire with the TACH post on the distributor and it fired up on the second crank. Don't have a functional tach at the moment, but at least its running and I can try and get my timing half way sorted out until I can get the tach working.
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Unread 04-07-2013, 12:24 PM   #9
roadyrob
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just checked my 87. the tach is the green wire with white stripe.
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Unread 04-07-2013, 12:26 PM   #10
OilfieldCowboy
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Quote:
Originally Posted by roadyrob View Post
just checked my 87. the tach is the green wire with white stripe.


I'll splice that one in later today and see if it will get the tach up and functional before attempting anything with the timing.
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Unread 04-07-2013, 05:47 PM   #11
OilfieldCowboy
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Green w/ white trace is wired into the tach output, I now have a solid RPM reading on the gauge.
Relay is wired up as per the schematic above, new issue; the sunovabich diesels when the key is turned off! So bad I've had to put it in first and dump the clutch to finally kill it. Wondering if this isn't an issue with the Howell ECM now...
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Unread 04-07-2013, 06:43 PM   #12
timatoe
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What's your timing at now?
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Unread 04-07-2013, 06:56 PM   #13
OilfieldCowboy
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Haven't even got that far as I pulled the jeep out of the garage to let it get to operating temp, and thats when I noticed the dieseling. Could that be timing related? Planning on setting it around 7*BTDC.
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Unread 04-07-2013, 08:23 PM   #14
jay-h
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Is it starting ok hot?

I ask because I had a problem with my Howell though with a Duraspark. The timing retard wire was not hooked up and it was troublesome starting warm.. flooding and other issues. Worked much better when I fixed that. My understanding is that the HEI does not have a timing retard at all so it would seem to have a similar problem?
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