carb'd ls1 ignition problem
#1
TECH Enthusiast
Thread Starter
iTrader: (6)
Join Date: Aug 2008
Location: DAVIDSON NC
Posts: 571
Likes: 0
Received 0 Likes
on
0 Posts
carb'd ls1 ignition problem
my carb'd ls1 with a msd 6010 box is'nt firing on #7 cylinder and i've switched plugs,plug wire and even put another set of coil packs on it with no luck...the problem started after i loaned my cam sensor to a friend in need,could this cause the problem?? does the cam sensor need to go in a certain way or does it sync itself? i'm kinda clueless on this...any help would be appreciated...thanks billy
#3
TECH Apprentice
iTrader: (21)
Join Date: Nov 2007
Location: Albuquerque, New Mexico
Posts: 398
Likes: 0
Received 0 Likes
on
0 Posts
I'm interested in finding out about the cam sensor as well. I purchased a rebuilt motor with the cam sensor mounted but the bolt just hand tightened. I just torqued it down but haven't fired it yet.
#6
According to MSD if the cam sensor is completely disconnected then the box has a 50-50 chance of starting up properly. I can tell you first hand the box will run the car with no cam sensor at all. So the fact the other 7 cylinders are firing properly tells me it is probably not the cam sensor.
You can try firing just that coil by triggering it with a 9V battery.
You can try firing just that coil by triggering it with a 9V battery.
Trending Topics
#9
There are only 4 wires going to each coil pack: 12V power and a 5V trigger signal from the computer. If you hook the 12V up like it is suppose to be the coil should fire every time you touch a 9V battery across the trigger wires. That will at least tell you if the coil pack is good. If it is, then you need to find out why there is no signal from the computer. You can do the same thing by just swapping coils around, but this is another way of testing them individually.
#10
TECH Junkie
iTrader: (11)
Sounds like a harness issue. After checking that pins haven't backed out, I'd probe the MSD harness for #7 cylinder. A VOM between pins A & D should show 12v with the key on. Observing a VOM between pins A & C while cranking should show 5-volt pulses (if it starts and runs, the pulses may occur too often to see). If you get voltage there, then probe the same pins at the coil harness...