Ok here goes motor was hydro locked cleared out all water gave tune up usual bit now we got spark got fuel and got compression motor cranks away injectors are spraying but will not fire wont even fire with the usual aid of starting fluid any ideas on what the issue can be its the inline 6 btw sounds like the map but to expensive to test on a whim thanks
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Re: 2000 cherokee wont start
The ignition system on your car has to work in perfect concert with the rest of the engine. The goal is to ignite the fuel at exactly the right time so that the expanding gases can do the maximum amount of work. If the ignition system fires at the wrong time, power will fall and gas consumption and emissions can increase.
When the fuel/air mixture in the cylinder burns, the temperature rises and the fuel is converted to exhaust gas. This transformation causes the pressure in the cylinder to increase dramatically and forces the piston down.the spark should occur before the piston reaches the top of the compression stroke, so by the time the piston starts down into its power stroke the pressures are high enough to start producing useful work.
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If you hydro-locked it,the damage may already be done.Let's hope your'e lucky.Remove the spark plugs,thoroughly drain the oil and refill.Remove the fuel pump relay,then crank the engine.Hopefully,the cylinder that filled with water will force it out through the plug hole(s).Put a few drops of oil down each plug hole,then reinstall the plugs and fuel pump relay.Start it up.You will know right away if there is damage(a bent connecting rod will cause the piston skirt to hit the crankshaft-will make loud noise).If it sounds OK,your'e probably in the clear.
If you got water inside your motor, it sounds like you may have hydro-locked, meaning water has filled one or more of your cylinders, not allowing the engine to turn over because the pistons can't compress water. Pull out all your spark plugs and turn the key as if you were going to start the car. If you see a bunch of water shoot out of the spark plug ports, then it was hydro-locked. Put the spark plugs back in and try to start the car. If the car starts, listen for clicking, ticking or banging from the engine. If you do hear a lot of noise turn it off immediately. Unfortunately, hydro-locking your engine can potentially cause a lot of damage to your engine. You could have bent a piston rod or a valve. If that's the case, you should take it into a shop to have it checked out.
If by "bad gas" you mean dirty or wet (water or alcohol), the fuel filter and/or lines may be clogged or holding water...or the injectors could be clogged with dirt.
Hearing the pump run doesn't mean that adequate pressure is reaching the engine...a fuel rail pressure tester will tell you if the pump and relay are doing their jobs properly.
Test for spark to rule out ignition circuits and module...Lay one plug wire near a good ground and have someone turn the key for a couple of seconds...you should see a long spark jump to ground. If no spark, the ignition module, distributor pickup, and crankshaft position sensor are the prime suspects.
> As a test ONLY, I would back out a plug and spray a short-shot of starter fluid into the cylinder, replace the plug (quickly...starter fluid evaporates pretty fast) and give a crank. If it sputters, it's definitely in the fuel delivery...and I would start with a fuel filter.
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It sounds like there may be a cylinder misfire... .basically a misfire is when a cylinder does not fire correctly, This can be caused by faulty spark plugs,coil packs,dirty fuel injectors,clogged fuel filter,or bad cylinder compression. When was the last time you gave it a tune-up? I would lean towards changing the spark plugs myself. good luck
Did you try changing the air breather for the motor?You need three things inorder for the engine to run well. Air,fuel,and spark.since you had a tune up and fuel flushed.I can only think of two things.First I never heard of flushing a fuel filter,you change it ( not flush it ) change your fuel filter,eliminate the guess work.And change your breather.