Engine cranks but wont fire. Tried quick start directly into throttle body and still nothing. No spark and VERY little fuel at block. When it broke down, there was a loud knock sounding like an empty spray paint can rattling. After it died, it started up one last time just enough to give a check engine light and then died and has not started since. Does anybody have any knowledge of what is wrong or any suggestions?
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Before going to the extreme of new computer i would check the crank angle sensor.With older cars there was a ignition distributor a mechanical part that physically triggered each spark plug when it needed to fire.That has been phased out so the crank angle sensors job is to inform the ecu of the rotational position of the engine to trigger the spark plug coils and injectors. It usually reads of the flywheel or the crank pulley
If it sound normal when you crank it, you're lacking one of 3 things: air, fuel, or spark. Start by removing the air cleaner cover and spraying a little starting fluid into the throttle body. If it fires up with the starting fluid, it's not getting fuel
If it doesn't fire up with the starting fluid, pull a spark plug wire off of a spark plug, pull back the boot, lay the wire down so the end is a half-inch or less from, but not touching, a metal part of the engine. Have someone crank the engine and see if it sparks. If no spark there, try the same thing with the coil wire by unplugging it from the distributor. If there's no spark there, check the ignition fuse and if that's good, replace the coil.
run the fault codes and fix the faulty sensor. use a code reader to reset the CPU from the battery change over.. Get a better mechanic because he should have known that if the engine cranks then the battery is good ( bought a battery for nothing) and the problem is else where ---like the immobiliser ---or key battery---- or cam/crank position sensor
You need spark at the right time, fuel pressure at the injectors, and normal compression. Have the spark plugs been changed in the past couple of years ? Have you checked the fuel pressure to see if it is enough ? Have you sprayed carb cleaner into the throttle body to try to make the engine try to start ? Does it sound like it has normal compression when cranking ?
Looks like you got spark, and gas in the throttle body made it fire: nice work.
Sounds like your fuel pump is out or the wiring is not turning it on. One way to be sure is to set a spare battery near the tank and hot wire the pump with jumper wires. Or if you have a voltmeter check for voltage at the fuel pump connector while the truck is cranking.. If the pump is working and getting gas to the engine, see if the injectors are pulsing. A good idea to check fuel pressure if the pump is working.
You need to check if its got air, fuel, and spark. spray some throttle body cleaner in the throttle body and quickly try to start it. if it fires up then your not getting fuel so you may need a fuel pump and filter. If it does nothing check for spark, if you have no spark then you need to check the coils and crank position sensor.
You have fuel at the rail, now it's time to see if it's making it past the injectors. Disconnect the air intake duct from the throttle body. Have an assistant crank the engine over while opening the throttle slightly. Spray starting fluid into the throttle body and see if the engine attempts to start. If it does, then the injectors are not firing. The reason the injectors are not firing could be : 1. Blown injector fuse (sometimes marked "INJ"). 2. Bad crank sensor. 3. No power to computer. 4. Computer problem (bad injector drivers). If you have tried to start the vehicle many times, then you should start to smell fuel if it is getting into the engine. If you smell fuel, then let it sit for a while and try checking for spark. An inexpensive spark tester can be purchased from most parts stores. The reason for no spark could be : 1. Blown ignition fuse (sometimes marked "IGN"). 2. Failed ignition module. 3. bad crank sensor. 4. bad ignition switch. If everything checks out, then try disconnecting the battery for at least 20min. the longer the better. If the engine still wont start, then more advanced diagnostics will be needed to determine the problem. I hope that this information is helpful and thank you for using Fixya.com. WARNING : Wear safety glasses when performing the starting fluid test. Keep hands and loose clothing away from moving engine parts and cooling fan motor. Use caution when working around distributorless ignition systems. These systems produce extremely high voltages which can cause severe injury or even death.
You need to conduct tests to be sure where the trouble is.
1. Spark test: remove the number one spark-plug, and hold it to the engine block. then ask a friend to crank up the engine..
2. If the system is good, you should see steady blue sparks. If you don't, then you would have to work on your ignition system.
3. Fuel test: get a can of 'starting fluid' or the common 'choke and throttle-body cleaner'.
4. Unbolt the clamp holding the air-intake hose to the throttle-body. Pull back the hose to expose the inside of the throttle-body.
5. Spray a good quantity of the cleaner into the body.
6. Re-attach the air-intake hose, and try to crank up the engine again.
7. It will show some hesitation, but keep cranking until it fires up, and able to idle.
8. If the throttle-body and the manifold are dirty, the choke cleaner should help.
9. Please get back to me if necessary.