What next?

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docstoy

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Or if 180 out , plug wire at #6 becomes #1 at dist.cap and reroute rest of plug wires , if it starts you were on exhaust stroke and not compression stroke, but your preload on lifters may also be to tight as Schurkey suggested. Also wouldn't be first spark plug wire routing that I've seen because of being 180 out. It will run just fine but not where GM intended it to be.
 

Nad_Yvalhosert

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Truck is a 1994 GMC yukon TBI.
Finally got my new motor in, all new "gm genuine" sensors, Davis unified distributor, new balancer, new everything.

I primed the motor with a priming tool through the distributor hole, set to TDC on #1, stabbed the distributor with rotor pointed at #1.

No start. While cranking, it hits on one cylinder sometimes. If I hold the throttle down, I get a backfire out of the tbi.

Ive reset TDC 5 times now, still same results. Dont want to keep cranking this and flooding the cylinders.

Its acting like the timing is way off, but it cant be. I set TDC by putting a small screw driver in the #1 plug hole until the cylinder starts to rise, then lining up timing mark on balancer. Ive triple checked the plug wire routing using this diagram.

At a complete loss now. What should I be checking?

edit; fuel pressure is 11psi

It seems as though you aren't at actual TDC, or dont know where TDC actually is.
Remove the driver side valve cover. Set the timing @TDC when the valves are both closed. That's TDC on the compression stroke.

That being said, do you have spark and proper fuel pressure?
 

rob249

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She lives! It was 180 out of timing. All I did was remove the distributor cap, rotate the motor untill the timing mark lined up on #6, then removed and re installed the distributor in the proper position. Fired right up, didnt even have to adjust the distributor, It was dead solid on 0 degrees. I shut it down, plugged the advance back in, reset the computer, then restarted and burped the air.

The fancy funnel I used, supposedly spill free, made a huge mess. I had it about 1/3 full, and It quickly over flowed.

I just did the catalytic convertor break in, now it has to fully cool, should be able to drive it and seat the rings tomorrow morning.

Thanks all!
 
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