Fuel Spark No Start

i have a 1995 s10 Blazer v6 Vortec 4.3l. I have Fuel spark timed ignition rebuilt motor and no start. i have spark in all 6 cyclinders, please responde... i am pulling my hair out... Please respond to my email address, [email protected] with any information as to why i have no start thank you.

i have a 1995 s10 Blazer v6 Vortec 4.3l. I have Fuel spark timed ignition rebuilt motor and no start. i have spark in all 6 cyclinders, please responde... i am pulling my hair out... Please respond to my email address, [email protected] with any information as to why i have no start thank you.

Welcome on your first post on AF.
Which 4.3 engine or what engine code?
What is the fuel pressure?
Are you getting injector pulse?

I don't have a fuel pressure gauge, but i have pressure. I am not sure on teh injector pulse, but when i dump fuel down the top of the phelum (sp) I still have nothing, i do not know the engine code but it's a 1995 with teh new style ignition, the plug wires come of the side of the distributor cap.

When was your engine rebuilt? Is this the first time you are trying to start it since rebuild?

THe engine is currently rebuilt no more then 2 weeks ago and yes this is the first attempts at turning the motor over

THe engine is currently rebuilt no more then 2 weeks ago and yes this is the first attempts at turning the motor over

Check to make sure you have compression. If you adjust your vavle lash to tight, your valves may not be closing all the way. Even with hydraulic lash adjusters, you can still tighten them to far.

Spark timing, are the wire positions correct, compression, make sure your getting a good ground on the chassis, (you never know, it happened on my friends honda). Make sure the ECM is connected fully, no loose connections on the engine. Start trouble shooting. Go and check everything.

Can you give us more details? Did you rebuild your existing motor or did you swap it out with something else like a rebuilt long block, or a used engine from another vehicle?

You said you have spark at all of the cylinders, I assume the distributor was removed during the rebuild, is it possible that the distributor is 180° out? Bring your number 1 piston to Top Dead Center and pull your distributor cap and make sure the rotor is pointing to the number 1 plug wire terminal.

The easiest way to tell that you are at top dead center is to remove the number 1 spark plug and place your thumb over the hole, then gently touch the key to make the starter crank a little at a time. When the number 1 piston is at TDC, you will hear and feel a puff of air coming out of the spark plug hole. (Yes, I know you can also simply look at the timing mark, but the timing mark is also visible when number 6 piston is firing too).

If this checks out good, turn the key with the distributor cap OFF and watch the rotation of the rotor. Make sure the plug wires are plugged into the cap in the correct order according to the firing order.

I had a friend that put a used engine in a car that was the exact same size engine, but the distributor on the "new" motor rotated in the opposite direction than the old motor. As soon as he switched the wires around on the cap, his engine started.