I put in my gt2-3 cam, ls6 springs, and hardneded pushrods, followed the guide at ls1tech to a T. especially making sure my timing chain was lined up right.

now I try to start the truck and all it does is crank, wont turn over. Its definately getting fuel because I can smell it, how do I check for spark?

i am going to try and loosen the rockers, maybe I put them on too tight so it cant build compression. i think they may be too tight because my torque wrench is 1/2" and the only 10mm I had was 1/4 and no converter...


any other suggestions please help, I need my truck working by tonight

truck is a 2004 silv 5.3 lm7

 

so far ive checked all connectors - all good

loosened rockers - didnt have the right tools to torque to 22ft/lbs so i guessed, and overtightened im guessing, didnt have any effect either way

pulled a sparkplug and its soaking wet with gasoline, appearently im flooded

ideas?

 

are you giving it any throttle as you try to start it?
Was it a stock cam before putting that one in?

 

first time i tried to start it no, after it didnt start after 2 attempts i tried giving it some throttle, and obviously still didnt work

yes, went from stock to this.

how do i clear the cylinders of fuel since they are flooded?

 

I have to get some sleep. but before I go.
The only things I can think of from reading around is to try to lean out your mixture if you can. and possibly check the cam sensor.
Tried doing some searching on EFI forum but i'm getting too tired.
Free bump anyway

 

thanks for the help man

im going to try and crank it without the plugs in and with the fuel injector fuse pulled to try and clear...

 

It's not your rockers. They are not like old style sbc. Check the grounds down behind the power steering bracket.

 

ok, i will, but what do I do about the flooded cylinders?

 

Unless there is a big puddle of fuel I would't worry about it.

We did a motor swap a few years back forgot the grounds and cranked it for hours. It fired right up when I found the ground wire that wasn't hooked up.

 

Check for a broken wire somewhere in the engine bay as you may have stepped on, or pulled something out when you were climbing around in the engine bay. Check the MAF sensor connector, and both coil-pac harness connectors again for a pushed-out or bent pin. Check your ECM harnesses and see if one got stepped on.