Injectors get their power from the main relay and get their ground signal from the computer. The power to the injector wire is BK/W , The input power wires to the relay are blue. Jump these two wires to bypass the relay. The blue wire gets it's power from the EGI fuse in the engine compartment fuse box. If fuse is ok, jump a 12 volt source wire to terminal on relay to repair problem.
Capri main relay
This Mercury Capri main engine control relay is located under/behind the LH headlight (bucket) and interfaces with the PCM/ECU. this is a double relay.... one set of contacts according to the wiring diagram. runs just the injectors.. the other set run a bunch of other devices on the motor.
According to the manual the STO (self test output) of the ecu/pcm....when tested...is supposed to read STO low or 0 volts and if anything would be wrong the needle on an analog V ohm meter will sweep back and forth from low to 12 volts to spell out the
code for the problem. When it stays at 12v would that indicate that the PCM is bad??
Check the main relay that is located behind the drivers side headlight can but to do so remove the coolant overflow bottle. In the process of testing, check for corrosion on the blue wire that goes into the green three wire connector.repair any brakes in the wires
SOURCE: I have an engine miss,****,buck at about 45 mph
Change plug wires next and put in some SeaFoam. This sounds like a tune up issue... just run though the paces.
SOURCE: 1993 Mecury Capri Timing Belt? Fuel Injectors?
If it runs better at times, then it sounds like a sensor. The ECT could be bad, it can cause idling and power issues.If the check engine light is flashing, then that can also be researched...blueamber...I've owned 6 of these capris so far
SOURCE: no spark and no injector pulse on a 92 capri 1.6
When you have both no spark and no injecter pulse its almost always the ignition module. The good thing is you can remove it and bring it to your nearest parts store and most of them will have a tester for those, but I am sure you will find that it is bad.
SOURCE: I have a 1993 mercury capri ...that will not start
Change your fuel filter - enough clogging can prevent fuel flow, and it sounds like you have a fuel delivery problem rather than an issue with the injectors firing. The other culprit would be the fuel pressure regulator. That's what will allow line pressure to be sufficient for the engine to run. Either a failed regulator or a broken vacuum reference line to the regulator would cause that.
SOURCE: 1990 grand marquis has 40 psi to fuel rail.
A lot of cars, trucks, SUV's, Toyota 4x4's will not start , until COMPLETELY assembled. I have left off just the last air boot between the filter & intake throttle body, & NOTHING. Then sprayed a touch of "starting fluid" & Varooom. It came to life. I checked fuel rail, it checked out, still nothing. I gort angry, had picked up the vehicle cheap, for a quick "flip" for some extra money while the wife was hospitalized. I didn't have any more time to fool with it. Put the boot back on between the filter & throttle body. Put a For Sale sign on it. Turned the key....to turn the whell to roll it down into the yard, & it fired & ran. After scratching my head a while, I took the boot off, NOTHING ELSE, no start.sure it is completely assembled.
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