HELP! Motor will crank but not fire!
Thread Starter
Teching In
Joined: May 2007
Posts: 13
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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?
Thread Starter
Teching In
Joined: May 2007
Posts: 13
Likes: 0
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.
Thread Starter
Teching In
Joined: May 2007
Posts: 13
Likes: 0
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?
