Motor turns over but will not start. Spark does seem weak but never the less it has spark. Checked fuel and there is fuel to the fuel nozzles. I did find it odd the the #2 cylinder had excessive fuel in the cylinder. I have been told it may be the timing or a crank position sensor. I am lost as to what it really could be. I read the coil pack out and it checked good for primary and secondary resistance check. I even checked the fuel pump and fuel ilter all checks good. Any help will be greatful. Very expensive trying to throw parts at a problem.
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Re: will not start! has fuel and fire
You could have fuel fouled plugs..... once that way there is no way to fix them just replace them.... and it will not start with fouled plugs......... then check the timing belt for cam to crank timing
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Check to see how much spark you have. Spark should jump at least a 3/4" inch gap. If it only jumps an eighth to a quarter inch or less than you have weak spark. If the coil is external replace it if the coil is inside the distributor replace the distributor.
I almost guarantee this is a week spark issue.
I don't have enough info to give you a specific answer so I've listed a bunch of possible problem that could cause your engine to roll over but not start.
Check the battery and connections, a weak battery or bad connections can cause a weak spark and stop the engine from firing.
Fuel pump or fuel filter, low gas pressure can cause to lean of a air/fuel mixture for the engine to start.
Bad gas, old gas or water in the gas can stop the engine from firing.
Bad or fouled spark plugs, could be caused by bad gas.
Ignition wiring problems, can cause weak or unreliable spark.
Bad, poorly connected or misconnected spark plug wires. Even 2 wire out of order can stop the engine from firing.
Oily spark plug wires, can cause the spark to fire at the wrong cylinder or misfire.
Worn, damaged or wet ignition components.
i have a 97 Tahoe with 5.7 vortex it had weak spark at plug it would turn over well but not fire enough to start and would foul the plugs with gas if i removed the fuel pump relay and tried it would dry out enough to start i would replace relay and it would keep running had ignition mod checked ok replaced coil problem went away
The engine needs three things to run, fuel, air and a spark at the right moment. Check the static timing of the motor, if those marks line up. You did not say you were getting any spark at the plugs. If you have spark, then try a little starting fuild into the intake while turning it over. If you have fuel delivery to the cylinders, the spark is coming at the right moment then it should be running. Any error codes set?
When you turn it over by hand it is getting "stuck" on the compression stroke. Take out all the spark plugs and it should turn over easily just in case your "stuck" situation is something more sinister like a broken timing belt causing the valves to hit the pistons (most unlikely). You can then check the condition of the plugs making sure they are not fouled and by cranking the engine with the starter motor to check the spark. You are looking for a nice strong blue regular spark. A small weak spark may not be sufficient to make the engine fire. If the spark is weak take take out the coil lead from the distributor and as it is being cranked see if a strong spark is thrown when you hold the end 6mm away from a grounding point. Work your way either side depending on the spark result to determing where you are loosing spark. If the spark is ok try some starting fluid to see if you can get the engine to fire. If it fires on starting fluid but won't run then the fuel circuit is suspect. If you have fuel pressure at the fuel rail you need to check the injectors are pulsing. You can bye a noid light which plugs into the injector and flashes every time a pulse is received. These cost about $20 form the auto shop. My bet is your sensors are ok though...
Check for a bad distributor cap and or rotor..........a bad cap and or rotor can caues firing (cross fire)across the terminals and introduce spark to the wrong cylinders at the wrong time....... hope this helps.....good luck!