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Old 10-13-2007, 06:30 PM
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HEI woes

My son has a Mallory 85 series distributor on the 350 in his truck. Has been having intermitant starting problems with it. So he has changed all of the componants in it coil ,module etc . Ran fine for a month but after runninig around and engine get's hot it won't start again .

Tracked it down to a spark issue...Hot no spark ...cold it's fine and keeps running till you shut it off .

Can a coil get heat soaked or something

Brian

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Old 10-13-2007, 06:56 PM
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Coils will get heat soak and cause a no start problem.
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Old 10-13-2007, 07:10 PM
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More than likely the module.

Swap it out for a good quality one.

At NAPA we have Echlin and Mileage Plus. Difference is $25 for the MP while the Echlin is $45.

You will more than likely you'll have to ask for the good stuff. Everyone usually expects the cheap price. (DANMB AutoZone)
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Old 10-13-2007, 08:36 PM
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Quote:
Originally Posted by RCastle
Coils will get heat soak and cause a no start problem.
What would possibly cause this to happen with a fairly new coil ...1200miles
Module was changed at the same time

We have checked and rechecked wiring of the new harness . Car runs fine for about a month then goes south again
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Old 10-13-2007, 09:47 PM
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Quote:
Originally Posted by Stroker56
What would possibly cause this to happen with a fairly new coil ...1200miles
Module was changed at the same time

We have checked and rechecked wiring of the new harness . Car runs fine for about a month then goes south again

Could just be a bad part.Had bad parts before with no miles on them at all.Not a frequent occurance but it does happen.Is it getting a good ground.Most electrical problems and failures are usually attributed to a bad or loose ground circuit.


Here is a tech link for them.I am not sure what your resistance should be at the coil off the top of my head,but you can e-mail their tech staff and find out what the specifications are if you do not still have the paper work that would have been included.
http://www.malloryperformance.com/As...aspx?BrandID=6

Last edited by RCastle; 10-13-2007 at 09:56 PM.
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Old 10-14-2007, 07:29 AM
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weak batt and/or worn starter and/or bad cables and/or not enough starter ground(s) will do it.....
when the motor is hot the starter motor pulls ALOT more amps to crank the motor which drops the voltage to the ign....

motor hot, measure the V at the starter while cranking....the Mallory has "minimum" required V or the module will not work....

because it does start fine cold....thats the most common causes...starter is pulling down the V to about 9V(?) and the module won't work that low ( sorry don't know what your dist module minimum is...ask Mallory)

a "quicky test" is try to start it hot with jumpers hooked up to a running car (for more available amps and ground source))....if it does start ok....problem is in the starter system....

Last edited by red65mustang; 10-14-2007 at 07:41 AM.
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Old 10-14-2007, 07:41 AM
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You may need to add a ballast resistor between the ignition switch and the coil. Read this POST for additional comments and info. Scroll down to the last comments.
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Old 10-14-2007, 08:16 AM
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Frisco, darn...you fixed that LOL mispell....how do you "scrool"

anyway...

if anything...

he would want a "bypass" the ballast resistor which drops the voltage when cranking for more V at the module (ex:the "I" terminal on a points solonoid feeds batt direct to the coil only when cranking) to overcome a weak batt etc....

Stroker,
do you have a 2 terminal solonoid and is the coil wire hooked up....to help starts when hot due to less V
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Old 10-14-2007, 08:27 AM
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Quote:
Originally Posted by red65mustang
Frisco, darn...you fixed that LOL mispell....how do you "scrool"
LOL You caught that did you? I usually use the Spellcheck function before posting and didn't that time. I caught it when I re-read my post and fixed it. Unfortunately, I am a "two-fingered" typist and am looking at the keyboard rather than the monitor when typing. Make lots of errors that way and I am very slow.

Your comments in the other post and this one should be very helpful to all who read and follow your advise.
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Old 10-14-2007, 08:35 AM
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Thanks guys for all the comments

Going out to work on it now. Good point on the low V . I do know it drops to 8.3 on the meter when cranking so good chance that's the problem.

Brian
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Old 10-14-2007, 08:56 AM
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Frisco, thanks....but....for any of my posts....ya got come back 3 days later and re-read because of the 99 "edits" it took me to write what I know in my head!

bet I hold the record for using the edit button!!!

Stroker,
quicky test #2:
does the starter need more ground? (cause it is gettin' a little worn)
hook a jumper cable from the bell housing next to the starter (or a starter mt bolt) back to batt neg....
starts good hot...add a cable...bell housing to body for more starter ground source (and from there back to batt neg if not a pita)
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