Question...

I have been working with a friends 528 cid Ray Barton Hemi (yes I know...but wow) and have been chasing a miss at 4000 RPM which occurs only when the MSD's rev limiter (chip) is installed. With a 6K chip in the box it starts to miss at 4K, take the chip out, no miss.

The ignition is a 6AL (new), an MSD HVC Coil, and an MSD Pro Billet distributor. Magnetic pickup wires are routed as far away as possible from all others, as are the coil wires. Plug wires are Taylor 409 spiro cores (suppression style).

Things I was wondering - could there be interference generated by the alternator at that RPM? Is the external ballast resistor contributing?

Unfortunately this is a street strip car and has just about everything that you could want in terms of creature comforts (stereo, a/c, etc) which is just about everything that I would want out of the way to dial the car in.

I would welcome any constructive ideas.

Thanks

Just out of curiosity, measure the resistance across that pill. Should be about 2710 ohms. The pill is probably fine but I'd measure it to be sure.

Originally posted by gwarren:
Just out of curiosity, measure the resistance across that pill. Should be about 2710 ohms. The pill is probably fine but I'd measure it to be sure. Sorry, the 2710 ohms is for a 4000 pill. You're 6000 pill should measure about 4,584 ohms.

Good idea, I checked that yesterday (it was the first thing that came to mind) - 4,570 on my meter. It could not be that easy.

Originally posted by James67RS:
Good idea, I checked that yesterday (it was the first thing that came to mind) - 4,570 on my meter. It could not be that easy. Since it's a new box I would call the place you bought it from and ask for an exchange. Call MSD first though and run it by their tech dept.