Changed plugs and wires, #1 injector, ECU . With a stethoscope, I can hear the #1 injector stop clicking when the engine is loaded. Verified with noid light. This is on a 2005 KIA Rio with 1.6L engine, auto, AC. Idles OK, and drives fine until loaded ( taking off from a stop, or accelerating).
The best thing i can think to do in you case is find out if you are loosing the 12v (unlikely) or the ground (more likely) one side of the injector will have a constant 12v. if the 12v is dissapearing under the load then just snip the wire and tie into one of the other injector feeds. they should all share the same fuse anyhow. if it is the groung pulse dissapearing just snip the wire by the injector and the computer and run a new one. shure it might look funny outside the loom but it eliminates all other possibilities. if the problem persists then you are looking at a connector fault or computer.seeing that you have replaced everything else this should get you back on the road. feel free to write back if you have any questions.. dustang
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What DTC code(s) are you getting?
You performed a compression test on cylinder #1; did you test cylinder #2?
Compare the readings, if there is a significant difference in compression readings between the two, you may have a bad head gasket, a bad valve, etc.
The bottom line, the problem is internal to the engine.
Locate the ignition coils - they are mounted on the ignition module. Remove the wide connector that goes to the module. You will have to unscrew it first. Spray some WD40 on the connector pins and try to scrub them with a tip of a small screwdriver. Be delicate not to brake or bend anything. Reconnect the connector. Start the engine and see if it still misses.
If it still does, try to touch/move each of the wires that go to the ignition module. BE VERY CAREFUL not to touch any of the moving parts of the engine as you have to do it with engine running.
If it still misses, do the following.
1. Engine off
2. Mark the ignition wires so that you reconnect them later in the same order
3. Locate the coil which gives spark for cyl 1
4. Switch locations of this coil with any of the two remaining coils
5. Reconnect the wires
6. Start the engine
If it now misses on another cylinder, you will have to buy a new coil.
If you have individual injectors, try switching one with another and see if the code moves-also consider the possibility that you have low compression in that cylinder. you might try to reset the ecu by disconnection of the battery for 5 minutes, and clean terminals and battery lugs, then reconnect it and let it idle so sensors 'relearn'-you should let it idle for a few minutes, then drive it gently for a couple more, then normally-adaptive ecu will relearn all sensors, and it may fix the CEL issue.
Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
I'm a bit confused concerning your spark plug wires as the standard 2.2 engine does not have them, so my suggestion is based on the 2.2 engine as the 4 cylinder you state you have. If the secondary electrical has been replaced, I would suggest inspecting the fuel injectors for operation. The easiest way to test the operation of the fuel injectors is to
listen for a clicking sound coming from the injectors while the engine
is running. This is accomplished using a mechanic's stethoscope, or a
long screwdriver. Place the end of the stethoscope or the screwdriver
(tip end, not handle) onto the body of the injector. Place the ear
pieces of the stethoscope in your ears, or if using a screwdriver,
place your ear on top of the handle. An audible clicking noise should
be heard; this is the solenoid operating. If the injector makes this
noise, the injector driver circuit and computer are operating as
designed. Continue testing all the injectors this way. If all appear to be functioning we can move on to the next suggestion. Let me know. Regards.
Same problem. 94 LHS 3.5L engine. Noticeable rythmic misfire at idle. Looks like cyl 5. When I pull the injector connector off of cyl 5 the idle rythm does not change. It does if i pull the inj connector off of any other cylinder. Spark OK. Injector ok using seperate 12vdc supply (clicks). Connector to injector has pulses on it verified with a test light. Inj coil resistanceis 12 ohms, exactly what it should be.
Still need to check compression and intake manifold gasket