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Problems after HEI install - UPDATED DIAGNOSTIC INFO
https://slantsix.org/forum/viewtopic.php?t=47940		 Page 1 of 1
Author:  Fab64 [ Sat Feb 18, 2012 11:55 am ]
Post subject:  Problems after HEI install - UPDATED DIAGNOSTIC INFO
Author:  SlantSixDan [ Sat Feb 18, 2012 2:10 pm ]
Post subject: 
It sounds like you did a careful installation. Heat sink grease is only for thermal connectivity, not electrical conduction. Have you checked to see if you have spark? If you do not, I think my first suspect would be that "remanufactured" distributor. If it is bad, get the new one you should've bought in the first place.
Author:  Fab64 [ Sat Feb 18, 2012 2:39 pm ]
Post subject: 
Quote:
I think my first suspect would be that "remanufactured" distributor. If it is bad, get the new one you should've bought in the first place.
Somehow I knew you were going to say that, Dan. :lol: So, where does one buy a new electronic distributor for a slant 6? Are they even available? Would this be NOS, or are new ones actually being manufactured? Do you have a link, or recommendation?

I have not checked for spark. In fact, I'm so frustrated with this, I just finished re-installing my old distributor for now. Luckily, I hadn't removed the old coil yet. Is there a way to isolate the problem to a specific component? If I have, or don't have spark, what would that indicate? If I have spark, does that point to the distributor? Would lack of spark point to the coil or control module? Sorry for the simple questions, but automotive electrics is really my weak point. Thanks.
Author:  SlantSixDan [ Sat Feb 18, 2012 2:48 pm ]
Post subject: 
Quote:
So, where does one buy a new electronic distributor for a slant 6? Are they even available?
Read the HEI upgrade article.
Quote:
I have not checked for spark.
That's the first step. Diagnosis.
Quote:
Is there a way to isolate the problem to a specific component?
Yes: Systematic diagnosis. If no spark, find out if you've got power to the module and coil. If not, find out if you've got power to the relay. Somewhere there's a faulty component and/or a faulty connection. Guessing is an expensive and frustrating way to find it. Systematically checking from the output end of the system to the input end of the system is a much faster, less frustrating way to do it.
Author:  neilskiw [ Mon Feb 20, 2012 8:20 am ]
Post subject: 
The poor running/missing you described reminds me of my own HEI install. The problem turned out to be the HEI module (used- thereby confirming Dan's bias on used or reman parts).

After purchasing and installing a new module, I was pleased with the improved idle characteristics, and improved fuel economy. I also put a second module under the hood, just in case.

Scroll down to the picture of the install (now owned by Nongan).

http://www.slantsix.org/forum/viewtopic ... ht=#341609

The improvement is well worth the pain!
Author:  Mroldfart2u [ Mon Feb 20, 2012 10:18 am ]
Post subject: 
I agree, pull module and run it to AutoZone for a test... its free and quick... That has happened one time to me on my lean burn delete on my c body'ed 440.. ran great for a few days and just quit. I had the receipt in hand and AZ exchanged it @ no charge...
Author:  Fab64 [ Tue Feb 21, 2012 8:32 am ]
Post subject: 
Thanks, guys. I'll take my module over to Autozone and have it tested.

Btw, this was a brand new, official Delco/GM control module. If my problem is, indeed, caused by a bad module, any ideas what might make it go out? After all, it was running fine at first. Could a bad ground have caused the module to burn out? I ask because I initially ran my ground wire to the module screw on the side the distributor wires connect to. I then read in Olaf's post that the module should be grounded on the opposite side screw. I had not read this before. As always, thanks for any input.

Roger
Author:  Fab64 [ Wed Mar 14, 2012 10:17 am ]
Post subject: 
Finally got some time to look into this a bit more. Took my control module to AutoZone and it tested out fine. That eliminated one component.

Wired the new coil (Standard FD-478X) into my old ignition setup, and it won't start. Using an Ohm-meter, I measured resistance of both old (Pertronix Flame Thrower) and new coils, between Pos and Neg terminals (side-to-side), and from one side terminal to the middle high-tension terminal. According to articles I've read, the side-to-side reading should be between .7 and 1.7 ohms, and the side-to-middle should be between 7,500 and 10,500 ohms. Here's what I found:

Old coil: side-to-side=1.6, side-to-middle=9,900
New coil: side-to-side=.7, side-to-middle=5,900

From these numbers, I assumed the coil was bad. I then re-installed the HEI control module and the electronic distributor, but wired it up to my old coil. It started right up. Which means the high-falutin', fancy, premium Standard BlueStreak FD-478X coil that I bought - brand new - was bad.

Unfortunately, I now have a new problem: the runs-with-the-ignition-key-off issue has returned. A while back, someone else reported this in another post, but I don't remember what the solution was, and I can't find the post now. I suspect this has something to do with the power relay that I am using. My next step is to take it out of the equation and see if it solves the problem.

As an aside, I don't think the Chrysler engineers could have made it more difficult to remove and re-install the distributor in these cars if they had tried! But I digress.

I would appreciate any advice for the run-on problem I'm having. Thanks.
Author:  Supercharged SL6 [ Sat Mar 17, 2012 6:34 pm ]
Post subject: 
Running with the key off,I had that problem when I installed a delco alternator and used the power wire from the OE regulator to power up the regulator in the delco alternator, the wire you have going to the relay may be hooked into the alternator regulator circuit, I had to run a wire from the keyed side of fuse box to the regulator in alternator to keep it away from the ignition other wise when I turned the key off with the alternator still spinning it would put power to the ignition,I believe the power wire for the ignition & regulator are the same when everything is all chrysler it works OK but when you add a GM component the power is back feeding from the alternator to the ignition
Author:  Fab64 [ Sat Mar 17, 2012 10:57 pm ]
Post subject: 
Thanks for the info. Yes, I am using the OE regulator wire to power my trigger feed (terminal #86 on the relay). I checked it beforehand, and it was only live when the key was on. But I've been speculating that that might be what's causing my problem. It hadn't occurred to me that power coming from the alternator might make that wire live even with the key off (duh!). It rained all day today so I haven't had a chance to get back to it, but I'll move it to a different power source and see what happens. I appreciate the feedback.
Author:  raycycled [ Sun Mar 18, 2012 2:20 pm ]
Post subject: 
I have successfully put an Oz Hemi 6, after market electronic dissy in our 63" Valiant, done over 2000 miles now never misses a beat, the clearance on the inner gaurd is minimal but the 63 valiant is a small car with the later models you should have heaps of room and only cost me $130, RAY
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