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Possible msd ignition issues?

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Possible msd ignition issues? Empty Possible msd ignition issues?

Post  f250mike August 9th 2011, 5:35 pm

Awhile back I put a digital 6 box in my truck.
Everything was fine until last month when the 2 step stopped working correctly while on the trans brake. It quit chattering for lack of a better word. My rpm's would still stop where it was set at though.
The last 2 races my 1/4 mile ET and mph have been off by 2-3 tenths and 4mph. I just figured it to be the hot humid weather.
This past Saturday while in the staging lane for qualifying my tach jumped from idle rpm to 4000rpm a few times and the shift light flashed several times.
When the qualifying pass was over I checked the max rpm on the tach and it went to 7000rpm (6500 is normal). I erased it and started the engine again, this time it was only idled. The recall went past 9000 rpm.
I did try a different coil for 2nd round qualifying. the recall rpm seemed right but the performance was still off.

Do you guys think the digital 6 box is my problem or is it something else??

Mike


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Post  rmcomprandy August 9th 2011, 6:32 pm

I know that a separate RPM activated switch going bad, like that of an air shifter, will affect how the ignition box works.

Anything else, I don't know.

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Post  crittersf1 August 11th 2011, 1:58 pm

Sounds like the box is ready to take a big ol' stinky dump
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Post  lghting94 August 11th 2011, 3:14 pm

could be a tach going bad also!
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Post  crittersf1 August 11th 2011, 5:43 pm

The tach shouldn't influence his ET's and MPH
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Post  f250mike August 11th 2011, 6:52 pm

Sunday I swapped out the digital 6 for my old 6al and 2 step.
I won't be able to try it out til Saturday at the races.
The tach seems to be working ok now.
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Post  lghting94 August 12th 2011, 8:12 am

The only reason i mentioned the tach is I have had one on my truck and another on a buddys truck short out or something inside and would cause the box to act funny motor would not rev right and seemed loaded up all the time.
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Post  KY JELLY August 12th 2011, 8:20 am

how old are your plug wires ? When they have over a certain amount of ohms per foot of wire they can cause problems and I think the 2 step not working is the first sign they are going bad.
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Post  f250mike August 12th 2011, 7:28 pm

Randy, I haven't checked the ohms on the wires since late last year.
I had thought about getting new ones but they checked out good
Thanks, I'll have to check them again.
Mike
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Post  KY JELLY August 12th 2011, 10:37 pm

msd has a tech support forum might try there too.

http://www.msdignition.com/forum/
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Post  f250mike August 12th 2011, 10:44 pm

Thanks again Randy!!
I tried calling the msd tech line today and must have put the wrong # in my cell phone.
I called some real estate office somewhere Embarassed .
mike
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Post  f250mike August 14th 2011, 10:33 pm

Well I guess the ignition box was where I had my issues.
I raced today and the truck ran more consistant than it has all year Very Happy .
Today was the finish of a rainout from last Saturday.
My first pass was a test pass and it went 12.04 at 109mph.
I went 3 rounds and ended up with the win. All 3 were 12.07 at 109mph.
New spark plug wires are going on before my next race just in case today was a fluke.

Thanks for the help guys
mike

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Post  69F100 August 14th 2011, 10:56 pm

Way to Mike the points leader Laughing cheers
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Post  BOSS 429 August 14th 2011, 11:18 pm

great job mike
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