High Speed Miss?

John Moore · 08-26-2008, 11:10 AM

Go Back to Basics. Check for Ground for the MSD Box. Recheck the wiring installation for proper grounding and Change to a different chip if using the analog type MSD Box.

FED 387 · 08-27-2008, 09:30 AM

make sure you run a ground wire from the head to the block ----a ground wire from the engine to the chassis ----a ground wire from the MSD DIRECTLY to the battery and also the chassis ---Check all your grounds make sure they are CLEAN--no rust, paint crud etc. These things get real finnicky at rpm can have you chasing your tail for months See if this helps--also try another RPM chip see if it has not failed they do go bad every now and then-Swap out YOUR MSD box with another box you might have a bad one-

Comp 387-

Charlie Yannetti · 09-01-2008, 07:30 PM

..... and if that fails, check your tach........ I've heard of a lot of guys that couldn't find a similar problem until they unplugged the tach........

R&S Motorsports · 10-26-2008, 12:02 AM

I had this same problem these issues can be very frustrating mine ended up being the High rev RPM port was bad no matter what chip I put in it would do the same thing than I ran a couple runs without a chip and the problem went away. I sent the box to MSD got it back after they said it was repaired put a chip back in and it did the exact same thing finally I just replaced the box and never had a problem since.

CrateCamaro · 10-27-2008, 03:59 PM

change the crank trigger pickup. Dont use the MSD brand...buy a Moroso. Seem to last longer

08-26-2008, 11:10 AM	#1
John Moore Junior Member Join Date: Jun 2002 Location: Kansas Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	Re: High Speed Miss? Go Back to Basics. Check for Ground for the MSD Box. Recheck the wiring installation for proper grounding and Change to a different chip if using the analog type MSD Box. __________________ John Moore ET 521,S/G 5212,T/S 521

08-27-2008, 09:30 AM	#2
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,421 Likes: 529 Liked 333 Times in 180 Posts	Re: High Speed Miss? make sure you run a ground wire from the head to the block ----a ground wire from the engine to the chassis ----a ground wire from the MSD DIRECTLY to the battery and also the chassis ---Check all your grounds make sure they are CLEAN--no rust, paint crud etc. These things get real finnicky at rpm can have you chasing your tail for months See if this helps--also try another RPM chip see if it has not failed they do go bad every now and then-Swap out YOUR MSD box with another box you might have a bad one- Comp 387-

09-01-2008, 07:30 PM	#3
Charlie Yannetti Senior Member Join Date: Jan 2005 Location: Alpine, NJ Posts: 568 Likes: 188 Liked 192 Times in 83 Posts	Re: High Speed Miss? ..... and if that fails, check your tach........ I've heard of a lot of guys that couldn't find a similar problem until they unplugged the tach........

10-26-2008, 12:02 AM	#4
R&S Motorsports Junior Member Join Date: Oct 2008 Location: Wind Lake, WI Posts: 54 Likes: 0 Liked 0 Times in 0 Posts	Re: High Speed Miss? I had this same problem these issues can be very frustrating mine ended up being the High rev RPM port was bad no matter what chip I put in it would do the same thing than I ran a couple runs without a chip and the problem went away. I sent the box to MSD got it back after they said it was repaired put a chip back in and it did the exact same thing finally I just replaced the box and never had a problem since.

10-27-2008, 03:59 PM	#5
CrateCamaro Member Join Date: Nov 2007 Location: Ontario Canada Posts: 411 Likes: 1 Liked 19 Times in 7 Posts	Re: High Speed Miss? change the crank trigger pickup. Dont use the MSD brand...buy a Moroso. Seem to last longer __________________ Tony Valerio 1968 Camaro 1700 IHRA H/CM 1701 NHRA SS/?A