Why does the spark jump - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TNBogger · 02-04-2005, 03:00 PM

On the 350 motor that I am trying to put in my truck I have a wiring problem or something. I put a new distributor cap, new module, new rotor button, and new plugs.Not because of this problem but because I wasn't getting fire.Now I am getting fire just not where I want it to be. When I turn it over a spark jumps from the ignition coil to the number 1 spark plug boot on the top of the distributor. Oh and I just put a new ignition coil in it thinking that was it. So that is the only thing I have really changed out trying to diagnose this problem. Thanks for any help I am trying to get this thing running.

MylilBowTie · 02-04-2005, 03:07 PM

Check your Firing order over again. If that doesn't work, get #1 cylinder TDC on compression stroke. Then take the cap off and see where the rotor is pointing to what tower on the cap. That's where the firing order needs to start.

60-66 Nut · 02-04-2005, 03:29 PM

Did you change the plug wires? If not, that's probably why the fire is jumping. HEI produces alot of voltage, and if the wires break down the spark will find the path of least resistance. Good luck.

60-66 Nut

marvxyz · 02-04-2005, 06:40 PM

You might try putting some silicone electrical grease in each plug wire boots, both at the distributer and at the motor, this may help your spark jump and it will also allow you to get the pliug wires off easier in the future.
marvxyz Pgh. Pa.

geezer GMC

02-04-2005, 03:07 PM	#2
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Check your Firing order over again. If that doesn't work, get #1 cylinder TDC on compression stroke. Then take the cap off and see where the rotor is pointing to what tower on the cap. That's where the firing order needs to start. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

02-04-2005, 03:29 PM	#3
60-66 Nut Professional Beer Tester Join Date: Aug 2004 Location: Louisiana Posts: 453	Did you change the plug wires? If not, that's probably why the fire is jumping. HEI produces alot of voltage, and if the wires break down the spark will find the path of least resistance. Good luck. 60-66 Nut __________________ 60 Ford F100 Custom Cab 61 Apache Short Fleetside 64 C10 Short Stepside 65 C80 409 V8 5spd(X-Firetruck) 83 GMC 350 Olds Diesel 85 GMC Short Bed 86 GMC Short Bed 90 GMC R3500 Crew Cab 92 GMC 1500

02-04-2005, 06:40 PM	#4
marvxyz Registered User Join Date: Jan 2005 Location: Pittsburgh, Pa. Posts: 27	spark jump You might try putting some silicone electrical grease in each plug wire boots, both at the distributer and at the motor, this may help your spark jump and it will also allow you to get the pliug wires off easier in the future. marvxyz Pgh. Pa. geezer GMC

02-04-2005, 03:00 PM	#1
TNBogger Registered User Join Date: Feb 2005 Location: Lebanon TN Posts: 14	Why does the spark jump On the 350 motor that I am trying to put in my truck I have a wiring problem or something. I put a new distributor cap, new module, new rotor button, and new plugs.Not because of this problem but because I wasn't getting fire.Now I am getting fire just not where I want it to be. When I turn it over a spark jumps from the ignition coil to the number 1 spark plug boot on the top of the distributor. Oh and I just put a new ignition coil in it thinking that was it. So that is the only thing I have really changed out trying to diagnose this problem. Thanks for any help I am trying to get this thing running.



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