Have fire thru plugs have fuel through the injectors and engine is in time. Also the compression is good. Car was experiencing some momentary spells of shutting down while running but would always restart. Now it has stopped altogether and won't crank up.
I am stumped. Have been working on cars a long time.
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must start unless there is a problem in the start circuit where there is no ignition circuit while starting ( ignition switch problem)
another problem may be excessive fuel to the cylinders from faulty injectors/ seals
if an engine has good compression, fuel/air mixture, right ignition timing right, correct firing order and the valve timing is correct , then the laws of physics demand that it fires
have you got all of those ducks lined up because if you miss any , it will not work
you have 2 of the 3 components necessary to make an engine run. You have compression , spark and now all you need is fuel. check why the injectors are not allowing fuel into the manifold. ( low fuel pressure-pump not working--no pulse to the injectors) check that all the wires and harness connections are properly connected . run a fault code check
Not sure I am following your story, but you need compression, spark at the right time, and fuel for the engine to start. If you know for a fact the plugs are firing, and you have compression, you may not have fuel at the injectors.
In short your engine will require 3 things to fire, spark/timing of, fuel, and compression. Check the easiest 1st, pull a plug wire and check for spark, if there is spark crank the engine over a few times more then remove a spark plug, if there is fuel on plugs you have gas flow and injector pulse, now check compression if there is good compression you should have good timing. Please check the above and let me know waht you do / do not have, from there we can narrow it down and get you an answer. Could very well be a crank sensor or such, until you narrow it down, the possibilities are endless.
Well you need fuel to the injectors, a spark, compression, air and a signal to the injectors to fire for the engine to start.
So if you've got fuel, make sure you have spark to the plugs, the air filter is not clogged, compression is above 120, and the crank and cam positions sensors are good.
The cylinder is not getting fuel, spark or compression. You have already checked for spark on that cable and it appears to be good. Pull the spark plug and see if it is damaged. You can also switch spark plug and cable to another cylinder and see if the miss travels with the plug and or cable. If so, you'll know its the spark plug/cable that is bad.
You can check for fuel by listening to the fuel injector to see if it clicks. Use an automotive stethoscope or a long screwdriver--put the metal end of the screwdriver on the injector and the other end against your ear and listen to the injector while the engine is cranking or running. You should hear it click for each time it pulses fuel.
If both fuel and spark are good, then you are probably missing compression in that cylinder. You (or a mechanic) will need to pull all the spark plugs and do a engine compression test with a compression test/gage set. Lots of things can lead to poor or zero compression including: broken piston rings, burned/stuck/broken valves, cracked cylinder head or engine block, cracked pistons,etc.
Because one cylinder is "dead", the engine has to work extra hard to start and run against a cylinder that is dragging it down. If you find low/no compression in that cylinder, you will probably have to remove the cylinder head to correct it. A big expensive job. It may be cost effective to replace the whole engine with a rebuilt one.
If the above information is correct.
1. Good Compression
2. Good Spark & Proper timing
3. Good fuel Pressure, injector pulse , injector spray, & fuel quality( no t contiminated)
4. Proper & clear air intake into engine
Then the likely cause would be a restricted exhaust. disconnect the exhaust at the manifold, and retry starting engine. keep me posted, we will make her run!