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post #47 of (permalink) Old 08-10-2013, 07:04 AM Thread Starter
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Join Date: Feb 2009
Location: Mesquite, TX
Posts: 1,056
Re: Dyno run question

Still can't work out a new dyno run, but I have a new question.

On the dyno print out I posted you can see the engine starts misfiring around 5500 rpm. The shop supervisor said that it was the MSD dropping cylinders as a result of the rpm limiter. So, I pulled the MSD plug that limits rpm and it said 6000. Whats up with 5500 vs 6000.

I went ahead and replaced the 6000 plug with a 7000 but haven't taken it out to see what happens. I plan on putting the car in 2nd and see where it now starts dropping cylinders. If it still bangs out at 5500 what could it be.

1967 Galaxie 2DHT w/460
Chopped to make a rag top
1972 F100
2013 F150 Platinum
2007 Jeep Commander (wife)
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