s10vortec

hi everybody im new to the forum and was wondering if someone can help me out. i have a 2000 4.8 vortec motor converted to carb with a 600cfm holley and edelbrock intake, im using the igintion curve 2 pill and i havent messed with the actual programing of the module its just the way it came out of the box and the #2 curve. Well the problem is that when i attach the map sensor and run the truck it stumbles not too bad but it stumbles as i accelerate to full throttle, but when i deattach the map sensor and not use it, it runs great no stumble....is this normal?? or so i can use the map sensor i have to actually program the ignition module to use it? thanks

S10xGN

iTrader: (11)

You should prolly hold off on using the MAP until you're able to program a curve. Sounds like you're getting too much timing with both MAP and pill...

s10vortec

thank you for the reply and advice , but what would the curve be like without the map working and with that pill #2

s10vortec

so im thinking without the map hooked up, 0 advance is given, as in vacuum advance?

S10xGN

iTrader: (11)

Pill info is in the instructions, if you don't have them go to MSD's web and download them.

Correct, no matter what vacuum advance you program in, you will have "0" with the MAP disconnected.

s10vortec

so the map sensor provides additional advance on top of the curve that is shown on the pill curve or is the advance already calculated into the pill curve? and thanks alot for the info so far

3pedals

iTrader: (3)

MAP advance is vacuum advance. when vacuum is present, the amount of map advance is added to the timing curve built into the pill(or custom program). FWIW all the pills that come with the MSD units seem to be terrible setups. I highly recomend setting up your own curve on a computer, and tailoring Map advance to the vacuum readings your engine makes

danbap

iTrader: (6)

what pills are everyone using to jsut get there engines running? also are you using a map sensor?

s10vortec

o ok i see now, thanks alot for the info guys, and yeah i think im going to make my own advance curve due to the fact i think the pills advance my motor too much, and for danbap, all the pills made my motor(stock 4.8 with holley 600 vacuum secondaries) run just not that great they are good just to turn on the motor but thats it and well i guess u might get lucky if one works good depending on what set up u have and for now im not running a map sensor due to the over advance factor, once i make my own curve then i will

hifi875

iTrader: (2)

mine started 1st time w 1pill and it will start w any pill and it will start w/out a pill