No Spark!
Thread Starter
Teching In
Joined: Oct 2006
Posts: 44
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From: south bay
No Spark! trying to get my '69 chevelle lq9 swap fired up today and got no spark. cranks hard but wont fire at all.. if it was an older set up i'd be able to figure it out, but w/ all this technology im confused 
any tips for what to look for? might be very noooob, but any tips are helpful, even the most obvious
any tips for what to look for? might be very noooob, but any tips are helpful, even the most obvious
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Other than spark, how about fuel pressure ? All of the injectors connected to the correct injector and getting voltage ? All of the vacuum line connected or plugged ?
Double check all of the sensors (knock, temp, maf, map, etc)
Double check all of the sensors (knock, temp, maf, map, etc)
Thread Starter
Teching In
Joined: Oct 2006
Posts: 44
Likes: 0
From: south bay
guess i should check all those sensors again... ive been thinking that there was a ground wire coming off of the engine fuse panel before the install, but there isnt one there now.. does anyone know which stud to attach the ground wire to? or does it matter when i connect it on the fuse panel? theres a few studs and a threaded hole where i could connect it, just dont know which to connect to 
TECH Apprentice
Joined: Aug 2005
Posts: 347
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From: Dover Arkansas
One threaded hole should be positive hooked to the battery positive. This energises all the constant battery + circuits on the UFB. You could hook the battery positive to a post thats on the underhood fuse box also. I used a continuity tester to find which ones all interconnect. Then you should have an ignition wire from your key to the underhood fuse box that trips the relay for all the ingnition on powered circuits. But you'll need to get power to your key circuit from the underhood fuse box for this to happen.I ran two wires from the UFB to the power distribution block on my fenderwell to do this. When you have all this, you should have power at the fuses for the injectors and the coils. I'm assuming you used the oem harness and underhood fuse box. Make sure it has all the fuses and relays you need for it to work also. Good luck with it. I guess if it's cranking though you've got power to the UFB. No ground wires go to posts or holes on the UFB.
Teching In
Joined: Feb 2007
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I'm not sure if it pertains to the lq9 but I know in my case (04 LS1) the VATS was programmed out using HPTuners and that software had a bug. They released a patch in april, I believe, to fix the software. After I had mine reprogrammed (and the coil packs wired because I forgot about them) it fired right up.
Jerry
Jerry