Hello and thanks for using Just Answer.I will try my best to help you with your question.
What engine size do you have in the Explorer?
Remove the spark plugs and clean them off and dry them off.
How did the vehicle run before you replaced the fuel pump and what lead you to replace the fuel pump?
Ok, remove the spark plugs and dry them off and clean them off. Or you can just replace them. Then try to start the truck.
Also check the dash where the Check Engine Light is on the instrument cluster. The light should come on when you turn the key to on, and then go off while you try to start the truck.
Do this and let me know what happens. If the truck still will not start, we will diagnose it farther.
I just mentioned to clean the plugs since you stated you smell fuel.
Do you have a test light? We need to check a couple of the circuits to the injectors and also place a good spark plug in one of the plug wires and place it on ground. You should get a bright blue/white spark when the engine is trying to start.
Well, if the check engine light goes off when you try to start the truck, the crankshaft position sensor is ok. We need to check for injector pulse that fires the injectors. Let me know when you get near the truck again and I can help you with the test. Also a NOID LIGHT is good for testing the fuel injector pulses.
It plugs into the injector electrical connector and should flash while you try to start the truck.
Thank you Ill Let you know what i find out
Hi there Are you online tonight
The timing chain set up on the 4.0L SOHC engine is tricky and requires special tools to set the timing chains. Your motor has 4 timing chains. Yes 4.
It sounds like the drivers side timing chain cassette has broken and the timing has jumped causing the low compression. When this happens, the valves will contact the pistons causing more damage. You will need to have a shop disassemble the motor to find the problem and the damage or you can replace the engine. It depends on your budget and how long you want to keep the vehicle.
Ford has a 3 year unlimited miles warranty on their replacement engines. I also know that Jasper has a 3 year 100,000 mile warranty on theirs. It depends on what way you want to go.
It is an interference motor (the valves will hit the pistons), not a freewheeling engine (valves will not hit the pistons).
The timing chain does not break. What does break is the plastic cassette that holds the chain in place. When the cassette breaks, the timing chain can jump timing causing the valves and pistons to come in contact with each other.