HELP! Motor will crank but not fire!
05-19-2008, 07:45 AM
#1
Teching In
Thread Starter
Join Date: May 2007
Posts: 13
Likes: 0
Received 0 Likes
on
0 Posts
HELP! Motor will crank but not fire! Alright guys, here is the background. 98 LS1 from an auto Firebird TA. Now in a manual 83 jeep scrambler. Computer flashed to remove unnecessary items (AC,Emissions, Evap, VATS, etc.). Harness modified to remove those items as well. PCM IGN FEED ran to IGN power through a fuse. PCM Battery Feed ran to Constant Battery power through fuse. All Fuel Injectors and Electronic Ignition Contol Modules run to IGN Power through a fuse. Motor will crank but not fire. Not getting a steady spark. I have fuel and oil pressure. What am I missing?
05-19-2008, 11:29 AM
#2
FormerVendor
iTrader: (5)
Join Date: Jun 2006
Location: N.E. FL
Posts: 170
Likes: 0
Received 0 Likes
on
0 Posts
Need to ck power to the injectors and coils while you are cranking, ck all power wires while cranking, alot of time they will have switched power and no power while cranking.
05-20-2008, 06:45 AM
#4
Teching In
Thread Starter
Join Date: May 2007
Posts: 13
Likes: 0
Received 0 Likes
on
0 Posts
Thanks Guys Thanks Guys. The PCM IGN FEED was not getting power during cranking. I jumped that wire straight to the battery, cranked it, and it fired right up. Now it runs for 2-3 seconds, so I guess I did not have the VATS removed. I guess I will build a bypass. That will be a nice extra security function.
05-23-2008, 12:14 PM
#6
Teching In
Thread Starter
Join Date: May 2007
Posts: 13
Likes: 0
Received 0 Likes
on
0 Posts
Vats Bypass Alright, I made the bypass acording to the writeup on the corvette forum. I have 5v not sure about 50hz yet. I wired it up to pin 11 (theft deterrant) that runs to the body module. IT still only runs for 203 seconds. What did I miss? I have a 98 motor, would it be looking for a different signal? Any tips?
