[DeTomaso] Erratic firing

[Will Kooiman]

I had 2 Mallory HyFire boxes conk out on me.  I don't remember the model#.  They were digital.

It was on 2 separate cars, and I had them both mounted properly, no welding, etc.

You can bypass the HyFire box.  The wiring instructions are online somewhere.

But when they went out, the car wouldn't run at all.  That's when I switched to MSD.  I have never had an issue with MSD.  Count me lucky.


On Dec 29, 2013, at 5:45 PM, Richard Greenblum <pantera at austin.rr.com> wrote:

> So would the back-fire when turning on the fans be a coincidence or possibly a reaction to the load created by the alternator?
> 
> Sent from my iPhone
> 
>> On Dec 29, 2013, at 15:31, gow2 at rc-tech.net wrote:
>> 
>> I would hate to jump to conclusions with assumpions so it would be good to
>> confirm you still have a good fuel supply to the carb.
>> 
>> Gary
>> 
>> 
>>> The timing chain is a double roller high quality steel unit, and the
>>> distributor (and entire ignition system) came from Dennis at PPC in CO
>>> (I'm pretty sure he takes care of the pin issues when he provides the
>>> setup).
>>> 
>>> You're right though, I should check the timing before yanking the box off.
>>> 
>>> Thanks Sean.
>>> 
>>> Sent from my iPhone
>>> 
>>>> On Dec 29, 2013, at 14:51, Sean Korb <spkorb at gmail.com> wrote:
>>>> 
>>>> Um... shears.  The distributor pin shears.  Geeze.  Spell check just
>>>> isn't helpful.
>>>> 
>>>>> On Sun, Dec 29, 2013 at 3:50 PM, Sean Korb <spkorb at gmail.com> wrote:
>>>>> Sounds like the timing is retarded.  Check the timing and see if it is
>>>>> stable.  Sometimes if the distributor pin stears or timing set wears
>>>>> it can get retarded fairly dramatically.
>>>>> 
>>>>> sean
>>>>> 
>>>>> On Sun, Dec 29, 2013 at 3:21 PM, Richard Greenblum
>>>>> <pantera at austin.rr.com> wrote:
>>>>>> All,
>>>>>> 
>>>>>> Rebuilt the Holley because it bucked when under load, otherwise ran
>>>>>> great.  Before putting it back on, welded up the door panel holes in
>>>>>> the right door because they were stupidly enlarged by the shop that
>>>>>> painted the car.  Put the carb back on and it wouldn't run for longer
>>>>>> than a few seconds before losing RPM and misfiring and back firing,
>>>>>> then dying.  Assumed it was a bad rebuild.  Put a brand new carb on,
>>>>>> same symptoms.
>>>>>> 
>>>>>> It also seemed to gain temp from cold very quickly.  I turned on the
>>>>>> fans (they're manually switched).  The engine immediately backfired
>>>>>> twice, so I turned off the fans and killed the motor.
>>>>>> 
>>>>>> In between the flat, misfiring, and rough running, it ran smoothly.
>>>>>> 
>>>>>> I forgot to disconnect the battery before welding on the door, then
>>>>>> figured (hoped) the few spot welds wouldn't do what Jack has warned us
>>>>>> about.  The box is a Mallory HyFire, and it's been on the car for a
>>>>>> long time.
>>>>>> 
>>>>>> Suggestions welcomed.
>>>>>> 
>>>>>> I thought I was going to finally get the car back on the road...
>>>>>> 
>>>>>> Richard
>>>>>> Austin, TX
>>>>>> 
>>>>>> Sent from my iPhone
>>>>>> 
>>>>>>> On Dec 29, 2013, at 11:26, "Stephen Nelson" <steve at snclocks.com>
>>>>>>> wrote:
>>>>>>> 
>>>>>>> Did some of the Panteras come with 2 bolt mains?
>>>>>>> 
>>>>>>> Stephen Nelson
>>>>>>> 
>>>>>>> 
>>>>>>> 
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>>>>> 
>>>>> 
>>>>> --
>>>>> Sean Korb spkorb at spkorb.org http://www.spkorb.org
>>>>> '65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera
>>>>> #1382
>>>>> "The more you drive, the less intelligent you get" --Miller
>>>>> "Computers are useless.  They can only give you answers." -P. Picasso
>>>> 
>>>> 
>>>> 
>>>> --
>>>> Sean Korb spkorb at spkorb.org http://www.spkorb.org
>>>> '65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera
>>>> #1382
>>>> "The more you drive, the less intelligent you get" --Miller
>>>> "Computers are useless.  They can only give you answers." -P. Picasso
>>> 
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