LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Running out of ideas could use some help

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Old Sep 24, 2010 | 10:04 PM
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Default Running out of ideas could use some help

I'll start from the beginning. Last night I fired my new motor for the first time. She started right up and ran good. Started another hand full of times with no problems. Left it that way and when went back out this morning tried starting her and got nothing.
I have been doing tests all day. started by checking for spark. First at the coil had it there then at the plug had it there. Next checked fuel pump. Primed up perfect and made sure a steady stream was coming out by the filter. Checked pressure at the rail. Had plenty of pressure and it held. Next i pulled the fuel rail off and made sure all injectors were spraying and they were.
So now I am getting fuel and spark and still no start. Checked compression and had good compression on all cylinders. Plugs were a little wet but not to bad.
I am running out of ideas now and could use some help. Again the motor was running perfect just last night. Could the timing have jumped somehow? Any help would be great and thanks in advance.
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Old Sep 24, 2010 | 10:07 PM
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Also I tried swapping coil and icm just in case and got nothing there as well as replaced the fuel filter.
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Old Sep 24, 2010 | 10:33 PM
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Maybe the plugs are fouled out,does it even try to start or just spin?
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Old Sep 24, 2010 | 10:37 PM
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I cleaned all the plugs up and let them sit out for awhile and they all sparked great. Made my old plugs look really bad. I unplugged the battery for awhile to let everything reset and then tried it again and it fired up but then died right away did that a few times and then went back to nothing. It does sound like it trying to start though. Its not throwing any codes either.
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Old Sep 24, 2010 | 10:45 PM
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did last resort and sprayed some starting fluid in it and still the same. It sounded like she wanted to but got nothing.
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Old Sep 24, 2010 | 11:46 PM
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well i think i may have found the problem. Pulled the valve covers off and some of the rockers were really lose. did some adjusting and got it to start every time Its not running right now but ill tackle that in the morning.
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Old Sep 25, 2010 | 05:03 AM
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Originally Posted by SwaY496
well i think i may have found the problem. Pulled the valve covers off and some of the rockers were really lose. did some adjusting and got it to start every time Its not running right now but ill tackle that in the morning.
Good think you caught that. Make sure you set the valve lash right and tighten the nut on the rocker arms really good. I made the mistake of not tightening them enough as well as not correctly setting valve las and ended up with a messed up rr and a couple of bent pushrods because of it.

Currently I have it set up with 3/4 past zero and then tightened and lock nut really tight! Ends up being about 1 full turn past 0 lash. Works well for me right now.
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Old Sep 25, 2010 | 01:45 PM
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I put about a half turn on mine. Now that valves are adjusted the car is starting again but now i cant keep it running. If i pedal it i can keep it going for awhile but im blowing a lot of white smoke out the back since im not tuned for the injectors yet. Right now i have my fuel pressure down to 30psi. Any thoughts on how to get it to idle?
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