Re: Changed engine and we have no spark, no injector...
Sounds like you missed a ground connection, probably coming out of the injector harnass or the one near the shock tower where the main harnass goes through firewall to PCM.
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I have to ask. How long since a tune-up? Are there any applicable trouble codes?
With engine cranking, if no spark at the spark plugs and no fuel injector pulse along with no fuel pump action, have to check rpm signal.
If you have spark and fuel injector pulse but, no fuel pump action, then we check the fuel pump circuit. Did you check applicable fuse, not only check the fuse, check the fuse circuit for voltage. At the fuel pump connector, gray wire is voltage for fuel pump motor and black wire is ground.
injector pulse is just controlled by the ecm or computer as some would say,u said u replaced wires? did u have a fire or melt wires? ecm is known to go bad on these,had a few of these trucks back in the day.
does it crank but not start or does it just click like dead battery or starter if it cranks check for spark and fuel pull spark plug wire and insert a screw driver and hold it close to an engine ground and have someone try to crank the engine is there a strong spark and use what is called a noid light it plugs into the plug for the injectors to see if the injectors are pulsing it should blink when you try too too start the engine if you have pulse and spark check for fuel pressure there should be a service port on the fuel rail that looks like a valve stem for a tire sort of youll need a fuel pressure tester if you had no spark or pulse at tthe injectors its most likely either the cam sensor crank sensor or the computor(pcm) if only no spark change the coil if that doesnt work you might need an ignition module but that requires more testing I cant explain here see a technician if no fuel pressure remove fuel filter drain and attemp to blow air through it if you cant its clogged replace and try vehicle if no start still feul pump is bad replace pump .
1. Freeze Powertrain Control Module (PCM) and see if the problem can be duplicated.
2. Wiggle tug test wiring for #2 injector.
3. Scope the #2 injector for a glitch when the misfire happens.
1. Test for the Exhaust Gas Recirculation (EGR)/coolant adapter gasket leaking EGR gases past the gasket.
2. Connect a vacuum pump to the MAP sensor, block the vacuum source, reset fuel trims, start the engine and add typical vacuum to the MAP sensor and check operation.
3. Test the spark output with 2 High Energy Ignition (HEI) testers, at 25 KV air gap each, at the spark plug wires to ground at wires 2 and 3, then 1 and 4 at cranking speed and engine running.
4. Test the fuel injector pulse width at the injectors compared to the scanner data.
5. Disconnect the O2 sensor, reset the fuel trims, test the system operation in open loop, test injector pulse width. Compare to the closed loop operation injector pulse width and engine operation.
6. Test the Powertrain Control Module (PCM) powers and grounds during the problem.
Im assuming this is a 3.9 ltr 6cyl? any way there is always three things to check in regards engine not starting.
1. Compression 2. Spark 3. Fuel. "make sure you have fuel in the tank" first :)
If your vehicle is EFI
If you cannot smell fuel. Carry out these simple checks. When the ignition is on engine off, Do you hear the fuel pump prime. This is noticeable by a short buzzing noise in the rear of the vehicle and then it will stop,
If noise is not present check the fuel pump fuse, then the relay, and last of all the fuel pump.
If the fuel pump is operational. Make sure the fuel filter is not blocked and obstructing delivery of fuel to the injector. If the fuel filter is ok, remove the injector plug from a injector and using a led circuit tester, or a noid lite. check for injector pulse.
If there is no injector pulse then it would possibly be a ignition module http://www.injectacarb.com.au/ford-falcon-eaed-ignition-module-p-40.html if this model of vehicle still uses a distributor
This only because I dont know if your vehicle is 3.2 ltr, 3.9 ltr single point inj, or 3.9 multi point inj,
ps: To check for injector pulse, using a LED TEST light just connect the test light in between the 2 terminals off the injector plug, and check for flickering of the led, this will say that the injector is pulsing.
A noid lite basically justs fits into the injector plug .
I hope this helps, let me know if you need more help. Regards.
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