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> my mallory may have died, how do I test it?
VaccaRabite
post Aug 1 2009, 10:36 PM
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Engine is in. Everything is ready.
But I don't get any spark.

Coil seems to be okay. I need to know if there is anyway to test the mallory?

I am not getting any power to the plugs.

I have tried putting a timing light on the plug wires and putting the timing light on the wire from the coil to the mallory just to see if there is currant, which there is not...

I am getting power to the coil.

I am SO CLOSE!!!! I just need to get this bitch running.


Zach
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VaccaRabite
post Aug 1 2009, 10:38 PM
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Also, the unit worked when I pulled the engine out last month.

In the good news side of things, I am getting enough oil pressure to turn off the light just running the starter.

Zach
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Kirmizi
post Aug 1 2009, 10:48 PM
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Zach,
I just pulled out the installation instructions and there's not much there.
Have you double-checked all your wiring/connections/etc...?

It states, "If the engine fails to start, rotate the distributor in small increments clockwise or counterclockwise until the engine starts. Do not exceed more than ten degrees ... in either direction."
Mike
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VaccaRabite
post Aug 1 2009, 10:52 PM
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QUOTE(Kirmizi @ Aug 1 2009, 11:48 PM) *

Zach,
I just pulled out the installation instructions and there's not much there.
Have you double-checked all your wiring/connections/etc...?

It states, "If the engine fails to start, rotate the distributor in small increments clockwise or counterclockwise until the engine starts. Do not exceed more than ten degrees ... in either direction."
Mike


Saw that.
Even if my timing was off, I'd be getting a pulse through the plug wires. I'm not getting any pulse. Mike (DrEvil) and I triple checked the wires. Its is in properly.

Zach
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brilliantrot
post Aug 1 2009, 11:15 PM
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I fried the electric portion of a mallory when my codriver left the key on for 6 or 8 minutes so they do go bad.
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VaccaRabite
post Aug 1 2009, 11:15 PM
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I have ordered a new optical sensor from CFR. I'll see if that helps things. I really want to get this car moving again. It is so close I can taste it.

Zach
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yeahmag
post Aug 1 2009, 11:28 PM
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Test procedure:

http://www.centuryperformance.com/mallory-...ng-spg-150.html
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brilliantrot
post Aug 1 2009, 11:32 PM
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Chris is good with shipping things fast as I had him send me a spare but now that I need it I can't find it. Anyways, see if you can find a stock one or even the dreaded 009. Mine failed right before timed runs at an autocross. 10 min later the 009 was in with a compufire module in it and I was away again.
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Dr Evil
post Aug 2 2009, 02:23 AM
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From Yeahmaq's link, "you will need a ballast resistor installed in the system to prevent killing a good module (if you attempt to start the engine). "

A yup, ya done kilt it with that misplaced wire (IMG:style_emoticons/default/wink.gif)
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jim_hoyland
post Aug 2 2009, 05:23 PM
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I didn't use a ballast resistor, but used a Bosch Blue coil. Seems like this combo works. I'm notclear when a ballast resistor is required??


QUOTE(Dr Evil @ Aug 2 2009, 01:23 AM) *

From Yeahmaq's link, "you will need a ballast resistor installed in the system to prevent killing a good module (if you attempt to start the engine). "

A yup, ya done kilt it with that misplaced wire (IMG:style_emoticons/default/wink.gif)
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ChrisFoley
post Aug 2 2009, 06:17 PM
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Most Bosch blue coils have the required resistance so a ballast resistor isn't necessary.
A weakness of the Mallory optical unit is that stray voltage signals can kill them. If you don't have spiral wound plug wires that can do it when the engine is shut down.
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VaccaRabite
post Aug 2 2009, 06:39 PM
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I seem to remember a chart that said what bosche blue coils had the internal ballast resistors, and which did not.

My car is using the blue coil, but also used a resistor, so I am guessing that my coil needed the resistor. How do I know for sure?

Zach
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ChrisFoley
post Aug 2 2009, 06:41 PM
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IIRC a coil that measures more than 1.4 ohms on the primary winding (plus and minus terminals) has the necessary internal resistance.
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orange914
post Aug 2 2009, 08:51 PM
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great to hear it's almost ready (IMG:style_emoticons/default/beerchug.gif)

mike
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Dr Evil
post Aug 3 2009, 12:50 AM
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Your coil was 5.1K both terminals to center and 0 ohms between the +/- so you needed the resistor that was not in the circuit.
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VaccaRabite
post Aug 3 2009, 07:58 AM
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QUOTE(Dr Evil @ Aug 3 2009, 01:50 AM) *

Your coil was 5.1K both terminals to center and 0 ohms between the +/- so you needed the resistor that was not in the circuit.

*nods* *smiles* *hopes no one notices I have no idea what Evil is saying...*

I have a conceptual idea of what is going on, but I would not be able to explain it if asked, or properly replicate the experiment...

Zach
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Gint
post Aug 3 2009, 09:50 PM
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Some coils have built in or internal ballast resistors. They measure higher resistance (3-4 ohms or so). Yours reads 0 ohms, so it's not internally ballasted.
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r_towle
post Aug 3 2009, 10:39 PM
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And internal ballast creates resistance.
Its also called a resistor.

This resistance needs to be in the system in order for your electronic sensor to function.
You have two choices.
1 is buy the correct resistor and put it inline like the manual says...or you could just hand it to Dr Evil and have him wire it up.

2, you could buy a different coil that has the built in resistance you need....but the risk of that is you WILL forget when the coil gets replaced down the road...

Rich
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VaccaRabite
post Aug 4 2009, 08:10 AM
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I have the resistor already. I was trying to determine if I was using a resistor when I did not need one, as Chris had said many of the blue coils have internal resistors. it turns out that mine does not. So, using the resistor I have is the right thing to be dong.

Zach
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stepuptotheMike
post Aug 4 2009, 09:06 AM
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I went the extra step and added Mallory's line filter. I think it was like another $26 bucks. Figured that was cheap insurance against nuking a module. So I've got the ballast resistor, the line filter and the mallory (IMG:style_emoticons/default/biggrin.gif)

But what if I get struck by lightning????? (IMG:style_emoticons/default/biggrin.gif)

Mike
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