Replaced fuel pump on your 1999 suburban which now is priming but the truck still wont fire Wants to start and stutters a bit but wont catch Plugs have gas on them and theres spark please help?

Answer 1

If your plugs are black, are they are real wet then they are fuel fowled and it will not start. you need to replace the spark plugs, and before you put them in while the old plugs are out, spin the engine over a few times so it will blow the fuel out of the cylinders. Then install new plugs. Make sure the coil wire is unhooked before blowing fuel out of cylinders. I do not know what was wrong with your truck to begin with, are why you put a pump in it.

I think you have another problem. But you did not say what was going on to start with.

NEW ANSWER : FROM NEUTZ.

SORRY but you are going to have to spend more money, When you said the engine

was kicking back that told me the wrong cylinder was firing, and the crank senor is what controlls that. The computer does not know what piston is ready to fire. With the crank sensor defective, the computer is firing cylinders at random because it does not no one cylinder from the other. When you replace it, clear codes with scanner and while you are driving it later, It will probley set another code witch is a false misfire diagnostic trouble code. Just clear the codes again with scanner.

THEORY: crank sensor-- The crankshaft position( CKP ) sensor provides the PCM ( computer ) with a crankshaft position signal. The PCM uses the signal to determine the spark sequence ( fire order ) for each cylinder. The PCM also uses the signal to precisely control ignition timing and calculate engine speed ( RPM ). The ignition system will not operate if the PCM does not receive a crankshaft position sensor input. I HOPE I HELPED YOU GOOD DAY.