Mercury Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I’m Chris. Welcome and thanks for asking your question!
Have you checked the fuel pressure?
Have you verified the pump is getting power and ground and is running?
Have you checked injector pulse?
Is the theft light on solid or flashing fast after the key has been in the run position longer than 5 seconds?
Wasnt getting fuel pressure, so changed pump and filter, 26 lbs of pressure.
Climbed under with test light getting power to pump , had the wife crank it while I tested it .
no flashing theft light when I turn the key
whats injector pulse
Did you install a Motorcraft pump, because 26psi is not enough.
Injector pulse is the ground signal to each injector from the computer. You plug up a noid light in place of a injector to see if there is a flashing light while cranking.
Airtek fuel pump
Could it be bad injectors even thow it starts off the bottle
It can be injectors, computer, wiring, sensors. We first of have to get the fuel pressure to the minimum 60 psi.
Is 26 psi tested at the injector rail the highest pressure you can get when turning the key from off to run?
That was before I changed the pump and filter, I will run back to the store and rent a pressure tester again
Unplug an injector and turn the key on, is one wire showing power?
Yes power to one side of injector
Sure did , test light was flashing
Okay it runs off spray, its has spark obviously, one injector is working, we do not know the current fuel pressure, and the theft system is not activated.
This leaves checking at least 3 more injectors since the engine can run on 4 cylinders. Then checking your new pumps fuel pressure. It has to be fuel pressure based on what results I am getting now.
Other possible causes are clogged air intake, faulty idle air control valve, clogged injectors.