BRUCE L RUSK
Newbie
I've got a 99 7.4 engine rebuilt I'm trying to get up and running. It has a comp towing cam and 411 PCM. Stabbed the distributor properly and I couldn't get it to twist enough to zero out on the scanner. The Spectra GM03 distributor I could only get to -25, I tried a moving a tooth and swinging the dizi the other way but could only get down to +50. I bought a Autozone distributor and it seems closer as I can get it to -7. First I'm confused on the math as the dizi has 13 teeth I would assume 360 degrees divided by 13 each tooth should give me about 27.x degrees of change but it seems like the scanner sees it more as 75. At this point I'm questioning if this is
A PCM tune issue, is there a table that can be adjusted to start with -10 offset instead of 0?
Is this a distributor issue, either the part itself since I have two that give different numbers?
Could this be a cam issue? I verified that the cam timing was at spec with a degree wheel checking a cylinder on each bank
Any help would be great, I'm moving in a few weeks and need this thing drivable for the move.
A PCM tune issue, is there a table that can be adjusted to start with -10 offset instead of 0?
Is this a distributor issue, either the part itself since I have two that give different numbers?
Could this be a cam issue? I verified that the cam timing was at spec with a degree wheel checking a cylinder on each bank
Any help would be great, I'm moving in a few weeks and need this thing drivable for the move.