Mallory 685 doesn't work with lt1 pcm
08-09-2011, 01:35 PM
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Mallory 685 doesn't work with lt1 pcm I have been having trouble getting my car to fire up while the mallory 685 box is connected. If I use the by-pass it fires right up. This is the second box in two weeks, and I have went over the wiring several times. I called Mallory and the tech line rep told me that the mallory box was not compatible with the LT1 pcm. WTF!!!!! Someone please help. I know there are guys using the box. Why won't mine start?
08-09-2011, 02:06 PM
#2
Would help if you told us how it's wired. Did you just put it between the ICM and the coil like a MSD? Do you have a link to the Mallory's specs and wiring?
Al 95 Z28 w/ MSD 6AL
Al 95 Z28 w/ MSD 6AL
08-09-2011, 02:39 PM
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works fine on my car.
only thing i noticed was instead of firing right as soon as i turn it over, it takes a second. idk if it's because of the start retard function or what
only thing i noticed was instead of firing right as soon as i turn it over, it takes a second. idk if it's because of the start retard function or what
08-09-2011, 09:33 PM
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Yes. The constant is wired staight to the battery. I used the MSD harness to "simplify" the install. I did notice that from the factory, the black and red wire (marked A and B on the connector) were backwards. Do I need to change my connection of the positive wire?
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08-09-2011, 09:36 PM
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08-14-2011, 12:41 PM
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Well, I took a test light and checked each wire coming from the box to the wiring harness, each wire is hooked up correctly. Again, I connected the by pass harness and the car fired right up. WTF!!!. I just got off the phone with summit and they are going to send out box #3. The sales rep apologized and stated "we'll get it right this time". I surely hope so.
On another note, I took the car out and sprayed 50 down the tube....for those who say you can't feel or tell the difference with such a small shot is full of $h!t. It was by no means a rocket car, but it definately added a power you can feel. I sprayed from 65 to 120 and then from a dead stop. I can't wait to get that 150 shot going.
On another note, I took the car out and sprayed 50 down the tube....for those who say you can't feel or tell the difference with such a small shot is full of $h!t. It was by no means a rocket car, but it definately added a power you can feel. I sprayed from 65 to 120 and then from a dead stop. I can't wait to get that 150 shot going.
