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Old 08-06-2012, 10:26 PM   #1
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Default Strange Misfire with MSD 7730......

I just finished hooking up the 7730 piggy-backed on my Mallory Hifire 6 box and Unilite Distributor. I am looking for the ability to add timing while in the converter at launch, and ramp it out as rpms get over 8000rpm. The launch retard was another factor.

Before ordering I talked to 2 separate techs at MSD to make sure it would work. Both had the same story. It will work fine.....On the 4 pin connector, Orange to B+, Red to Ing from Mallor box, White to Green Trigger from Mallory box, Black to ground. From the 7730 to the Distributor, it was white to ground, red to red, and the brown wire on the Unilite to ground.

Car fires up fine cold, and I ran it through some timing checks. As the motor starts to get warmed up, I noticed a very intermittent misfire. Worse at lower rpms.

Here is a video of what it is doing..........any thoughts or input would be greatly appreciated.

http://www.youtube.com/watch?v=p4CbQnfd358&feature=youtu.be
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Hell no, big blocks are for dump trucks!!!
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Old 08-06-2012, 10:33 PM   #2
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Default Re: Strange Misfire with MSD 7730......

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Originally Posted by lun40119 View Post
I just finished hooking up the 7730 piggy-backed on my Mallory Hifire 6 box and Unilite Distributor. I am looking for the ability to add timing while in the converter at launch, and ramp it out as rpms get over 8000rpm. The launch retard was another factor.

Before ordering I talked to 2 separate techs at MSD to make sure it would work. Both had the same story. It will work fine.....On the 4 pin connector, Orange to B+, Red to Ing from Mallor box, White to Green Trigger from Mallory box, Black to ground. From the 7730 to the Distributor, it was white to GREEN, red to red, and the brown wire on the Unilite to ground.

Car fires up fine cold, and I ran it through some timing checks. As the motor starts to get warmed up, I noticed a very intermittent misfire. Worse at lower rpms.

Here is a video of what it is doing..........any thoughts or input would be greatly appreciated.

http://www.youtube.com/watch?v=p4CbQnfd358&feature=youtu.be
OOPS.
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Hell no, big blocks are for dump trucks!!!
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Old 08-07-2012, 12:36 PM   #3
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Default Re: Strange Misfire with MSD 7730......

how much timing are you taking out ?

and did we check rotor phasing ?
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Old 08-07-2012, 12:45 PM   #4
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Default Re: Strange Misfire with MSD 7730......

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how much timing are you taking out ?

and did we check rotor phasing ?
47 is the base........I pulled 7 to let it idle.....12 to start it. No I didn't check rotor phasing. We have been bouncing it around in teh NA section also. The thought is lots of fuel/timing through the converter to get it to hit the converter, and then pull it out down track above 7500-8000-8500.

I talked to Joe at MSD, and he said that when the grid retards the timing it is causing the rotor in my unilite to be out of phase. He suggested the 85501 with rotor 84211.

This would be alot easier if I had a crank trigger. Ill be installing one this winter when funds are available. We have been spending money like the obama's lately for Drag Week........
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Hell no, big blocks are for dump trucks!!!

Last edited by lun40119; 08-07-2012 at 12:46 PM.
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Old 08-07-2012, 02:18 PM   #5
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Default Re: Strange Misfire with MSD 7730......

still need to see those files....i have all the engineers here at my
desk waiting on you!
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Old 08-07-2012, 02:23 PM   #6
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Default Re: Strange Misfire with MSD 7730......

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Originally Posted by texas racer View Post
still need to see those files....i have all the engineers here at my
desk waiting on you!

Perfect......you want a screen shot of the general setup right? I will get them for you when I am at home. I am at work until 4 or so Central.

This is my first trip into MSD land..........and I am pretty slow. Did I mention the software is pretty confusing too.......I can't even figure out how to get it to record?
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Hell no, big blocks are for dump trucks!!!
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Old 08-07-2012, 02:24 PM   #7
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Default Re: Strange Misfire with MSD 7730......

Have them look at her til this afternoon.........I promise Ill get the data!!!

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Hell no, big blocks are for dump trucks!!!
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Old 08-07-2012, 02:31 PM   #8
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Default Re: Strange Misfire with MSD 7730......

all that did was make more of a crowd around the moniter!
(dry hump)

p/m me a daytime phone number ...and i'll call ya .
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Old 08-07-2012, 02:34 PM   #9
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Default Re: Strange Misfire with MSD 7730......

PM sent......... Thanks fella!!!
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Old 08-07-2012, 04:01 PM   #10
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Default Re: Strange Misfire with MSD 7730......

It almost sounds like the coil wire is arcing out on something.Did you try disconnecting the tach and try it?
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Old 08-07-2012, 04:15 PM   #11
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Default Re: Strange Misfire with MSD 7730......

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It almost sounds like the coil wire is arcing out on something.Did you try disconnecting the tach and try it?
I did not try that.
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Originally Posted by Chris Uratchko View Post
Hell no, big blocks are for dump trucks!!!
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Old 08-07-2012, 06:58 PM   #12
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Default Re: Strange Misfire with MSD 7730......

What files exactly are you looking for?

Here are the settings...
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Hell no, big blocks are for dump trucks!!!
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Old 08-07-2012, 08:18 PM   #13
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Default Re: Strange Misfire with MSD 7730......

This is my first trip around the block with ANY MSD PRODUCT................and it makes me want to light the M'fkn car on fire!!!
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Hell no, big blocks are for dump trucks!!!
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Old 08-08-2012, 09:12 AM   #14
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Default Re: Strange Misfire with MSD 7730......

I was on the phone with Joe in tech last night.....he walked me through turning on the data logger........still isn't working. I also have a "Cam Sync" error, with the individual cylinder timing function turned off....
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Old 08-08-2012, 11:22 AM   #15
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Default Re: Strange Misfire with MSD 7730......

Quote:
also have a "Cam Sync" error, with the individual cylinder timing function turned off....
even if that was on..it would not effect anything...( only if you were doing i.c.t)

we need data from a quick run...

under msd re-view ...

is the lap top currently with you or at home?
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