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

So I am completly stumped

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Old 10-03-2009, 12:03 PM
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Default So I am completly stumped

Hey guys I am out of ideas. My rebuilt engine should run but it does not. Its not running on cylinders 2,3,6,and 7. This is my list of stuff I have checked and everything has passed.

-Plug wires
-Plugs
-Injectors
-Rockers
-Timing marks on the chain

New parts Include

- Gm Ac delco Optispark
- New plug Wires
- New plugs tr55s
- Rebuilt Engine
- New ICM and Coil

Today I went out and checked the timing by bringing each cylinder to top dead center and checking the rockers. I also was checking and could feel that the piston was at the top. I would also check my rockers and they were both down since the cylinder should be firing. So I am completely stumped. I think I am towing it so a shop and let them look at it. Just for a last chance anybody have any ideas?
Old 10-03-2009, 01:56 PM
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Have you tested each of the Wires with a Spark Tester to determine that they are not firing?

I was just wondering..if you have Bent Valves then it's won't fire well either. Did you do a Compression Check?

Regardless if it's a major problem I would take it to a different shop than the one that re-built it, and make the first shop pay for it.
Old 10-03-2009, 02:55 PM
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Well I might have found my problem. We will find out in the next 1 hour. Anyways I was changing the oil when I found on of my grounds that sit on the coil is completely off. Does any one know what those grounds are for?
Old 10-03-2009, 03:26 PM
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You def need to check all the grounds on car.
You can find them all here..
http://shbox.com/page/index.html

K Mack
Old 10-03-2009, 04:31 PM
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I'd re-connect that ground.. that is definately something important, and may be the cause of your problem.
Old 10-03-2009, 05:27 PM
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Well it was just the lighting strap so no change. Its going to a shop this week. I have had nothing but 7 months of straight trouble from this car. I had the engine rebuilt this 2.5 months ago and about a week after i got it back I have had this issue from the car.




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