Hey everybody I need help my truck has no spark or more accurately it Sparks Once and never Sparks again when I turn it over please help I need it for work. I have bought a new crankshaft position sensor I have checked every module and sensor out with an ohms meter don't know where else to look has anyone ever had an issue where it has a spark but only once when initially turning it over. 1998 silverado v6

 

please. anyone?

 

How are you checking for spark? What color is the spark, yellow, white?

 

is whiteish blue. this is a new motor. the old one ran just before I pulled it out. I've tried everything I cannot figure this out it's so weird I just get one spark and then nothing. I have replaced every sensor and coil.stabbed distributor 3x thinking maybe it won't spark if it's not installed correctly is this true. Now I did clean the intake manifold I'm wondering if maybe solvent got inside where the plug is would that be a problem?

 

Ok, back track. When did it stop running? What was done prior?

 

I put a rebuilt motor from O'Reilly in . the old motor never stoped running. it had a blown head gasket possibly a cracked block but it ran really good. I had both old and new motor side by side in my garage. Then I transferred everything from the old motor on to the new motor. After installation I plugged everything in. It did not start. I then immediately check for spark I found that it had only one sparked once each time you tried to start the motor. I ran a code reader on it it said crank position sensor. I replace that. Along with all the other sensors ICM coil pick up coil distributor cap rotor. I also Reese stabbed the distributor a few times one tooth one way or the other. The code reader says crank position sensor. The crank position sensor sends a signal only once each time i try to start the truck.That's where I'm stuck. What would make it do that. Oh yes also I took the whole front of the motor apart to check the reluctor ring and it is fine.

 

this is a tough one huh. Change the computer today too. Still same thing when I turn it over and I'll spark once never spark again

 

I'd recommend replacing the CPS, I know you replaced it, but new dosen't mean good.

 

Actually have replaced it twice thinking maybe I got a bad one the first time. But my question is if the crank position sensor is bad will it allow me to have one Spark each time I turn the key.

 

YES i got it running. turned over by hand while checking crank sensor for 5 volts on and off .... again .done this twice now. and realized i did not hear fuel pump coming on and off. You would never believe it but the new timing cover I bought was too thick. Not allowing the sensor to come close enough contact with the reluctor ring. I sanded down installation hole a little and installed the sensor. And it ran!!! cant believe that one.