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11-14-2006, 04:58:25 PM
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#1
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Lifetime Gold Member
Join Date: Apr 2002
Location: Shippensburg, PA
Posts: 1,078
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MSD Digital 6 high rpm miss
Anybody else have a high rpm miss with their Digital 6? Mine starts coming in at about 5500. The rev limiter is set at 7000 rpm. Any suggestions or feedback would be greatly appreciated. It's a brand new unit, a brand new battery, the only thing I can think of is that the alternator is dropping amps up that high hence an electrical gremlin.
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I'm a lifeguard for the shallow end of the gene pool.
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11-14-2006, 05:46:22 PM
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#2
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Veteran Member
Join Date: Jun 2001
Location: Austin, TX 78730
Posts: 288
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Never heard of that before,
could it be something else ?
I would call MSD they have always been real good about helping you with their products.
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1971 Camaro SOLD
1998 Firebird SOLD
1979 Camaro
2002 Camaro
2007 Acura RDX
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11-14-2006, 05:51:49 PM
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#3
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Veteran Member
Join Date: Jul 2001
Location: Madison, WI
Posts: 10,298
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I don't know if I'd suspect the alternator as they will either work or not work. In other words if it's not putting out the volts down low it won't up high either. Easy enough to check with a meter.
I'd check the wires, rotor and cap though as a first step. I'll assume the plugs are in good order. That would be a simple list of things.
Last edited by Rick WI : 11-14-2006 at 05:56:51 PM.
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11-14-2006, 06:06:16 PM
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#4
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Lifetime Gold Member
Join Date: Apr 2002
Location: Shippensburg, PA
Posts: 1,078
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The rotor, cap, plugs, and distributer body are new. The only thing it might be is the wires. They're about 4 years old. Is there any way to check them or is it just something you have to replace and cross your fingers?
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I'm a lifeguard for the shallow end of the gene pool.
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11-14-2006, 06:09:26 PM
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#5
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L. G. M. / Moderator
Join Date: Jun 2003
Location: Calgary, Alberta, Canada
Posts: 4,165
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My Mallory Hyfire VI-AL with a digital rev limiter started screwing up this summer. I had the rev limiter set to 6750 & it suddenly kicked in at 4700. I cranked it all the way to 9000rpm & it still wouldn't let me go over 5500.
Mallory fixed it but I've been running for 3-4 months with out it & can't tell the difference so I sold it on Ebay.
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10.236@131.52mph with a 150 shot & 11.60@118mph NA
A 10 second street car, eh!
SBC 409, through the mufflers, on DOT radials, you know, like a street car should be.
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11-14-2006, 06:10:26 PM
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#6
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Lifetime Gold Member
Join Date: Jul 2001
Location: san bernardino calif
Posts: 16,462
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Quote:
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Originally Posted by PaRoadDawg
The rotor, cap, plugs, and distributer body are new. The only thing it might be is the wires. They're about 4 years old. Is there any way to check them or is it just something you have to replace and cross your fingers?
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this sounds almost like the problem marv had with his nova a year or so ago and he checked everything and even tore the motor apart looking for the problem .his sbc would start breaking up around 6000rpm and i think it was eventually the valve springs that was the culprit . i would maybe talk with marv and find out what he did to figure out his high RPM miss
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1970 LT1 350sbc / 425hp 11.1:1 comp, GM #140 off-road solid lifter cam ,holley strip dominator
2" open spacer and holley 750dp ...........all old school 70's performance parts
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my old school camaro idle video
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11-14-2006, 06:53:46 PM
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#7
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Veteran Member
Join Date: Jul 2001
Location: Madison, WI
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Sometimes a visual will spot tracking, burning or arcing. The only other way is to ohm them but it's not going to say too much as you don't have a baseline. If they read 5000 ohms though they are shot, that would be a VERY high reading. New high performance wires will ohm out in the 100 to 200 range. Accel yellow wires I have seen in the 1000 range.
4 years is long for wires so would not be a total waste to replace.
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11-14-2006, 06:58:33 PM
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#8
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Veteran Member
Join Date: Jan 2005
Location: so cal
Posts: 1,252
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Did you gap the plugs, MSD recommends it to be alittle wider then normal.
Jake
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