Great,,, which grounds did you clean?

 

Did you compression test it yet? I had a Chevy that jumped time on me and naturally the compression was so weak that it wouldn't start. If it had, I might have had to buy new heads "valves" for the poor old thing. It might be a valve timing issue. I have seen "mechanics" rebuild an engine and never give the timing chain and sprockets a second thought.

But the point about proper grounding is right on the mark. If a good ground is not provided, it will start looking for an easier path to ground and that can damage a lot of solid state circuits. Hope you find your problem.

 

And the answer is:


SPARK PLUGS!!! put new ones in and it fired right up.... Thanks for yalls help

 

Spark Plugs? Sheesh.. A 3 page thread over spark plugs and the OP changed the computer for god sakes.

Did you put old spark plugs in it when you rebuilt the engine 5000 miles ago?

 

How bad were these plugs?

 

I guess they went to the junkyard for new plugs.

 

The reason I did not guess plugs was because my grandpa just put new ones in about a month ago. (autolites) I told him to use motorcraft, but he didnt. They failed because of the fuel regulator putting too much fuel into cylinders and flooding it out.

 

I have Autolites with no issues. I guess when you did the TDC exercise the fouled plug wasn't evident... Fouled plugs are fairly obvious as the plug will be blackish and usually wet with fuel.

 

And I wonder how many times they had been wet? Good for you. How does the cap and rotor look?