archery dawg

OK I just put a new engine well I rebuilt it in my 93 cherokee but now I can't get it to fire everything is on right and everything but the cp is new on and in it but sometimes I have fire from the plugs and sometime I don't. I don't know what more to do could someone help

J-leblanc

Is your distributor in backwards? You rebuilt it yourself? Is this your first engine rebuild?

tjwalker

1. I agree that you should be sure that the distributor is INDEXED properly.

2. Verify spark and quality of spark. Remove a plug, keep it attached to the plug wire, place the plug electrode near a good engine ground, have a buddy crank the engine while you watch. You need a strong, BLUE, snapping spark for the engine to fire. Yellow/orange/white indicates a weak spark, which may not be strong enough to start the engine.

archery dawg

Yes the distrbutor in right and the distrbutor is on the number 1 tdc on the compression stroke sometimes I am getting the plugs to fire and when it does its blue but is only speaking like 10 times then nothing for a few mins everything is new and no its not my 1st time doing a engine its like the 3rd

cruiser54

http://www.angelfire.com/my/fan/dist_index.html

archduke of cherokee

My best guess would be that you probably have a problem in your electrical somewhere i have had cars do this to me it's electrical if it doesn't give you any spark at all,it's mechanical if it try's to start but it seems like something is stopping it.

cruiser54

Did you get the all ground wires hooked back up at the dipstick tube stud and back of head?

archduke of cherokee

?

cruiser54

If he just changed engines there's a chance he might have missed the ground connections upon reinstallation.

archduke of cherokee

My thought exactly while putting the new engine in you may have missed an important wire or two. Also I would check the spark plugs I had a 4wheeler with bad connection at the sparks and it would not start.

archery dawg

Everything its hooked up I done looked 3 times and redone it 3 times so coyote it be the cp? Cuz that's the only thing I ant done yet

archduke of cherokee

Have you checked the computer?

cruiser54

Now how's he gonna do that?

archduke of cherokee

Youv never heard of checking the computer?

archduke of cherokee

Could be getting false readings thinking it's not supposed to start when it is.