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Hi there have you checked the vitals fuel, spark and compression . these cars are known to have problems with coils .swop the good coil with faulty cylinders , check fuel injector wires for ground and power continuity . if all good the problem should be compression fault should be valves or lifters not seating well
you don`t say how you verified that the plug and wire was good. I think these use coil on plug, if so check powers and grounds for that coil as one may have a problem.other things that could cause this is a bad fuel injector, poor compression due to either rings, valve, worn cam, damaged push rod,
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For the misfires, start by pulling your plugs. They either need to be cleaned or replaced if questionable. Then, you may have a bad coil or coil pack. You can test them with a multi-tester-you'll want resistance values that are specific for your vehicle. Alternatively, you can switch the coil packs around (if you know you have a good one from knowing which cylinders are misfiring and which are firing o.k.) If your misfires change cylinder numbers from swapping, you know you had a bad coil. Other possibilities for misfire could be the electronic ignition module or the pick-up coil inside the distributor(if you even have a distrib.) FYI: code for o2 sensor means that circuit has a malfunction, may be the sensor itself, or a wiring problem. Good luck.
Hello! There is a wiring multiple between the four coils of the Red and Black
(+12 and Ground) wiring that may have opened up during the head replacement...On Coil #1...Pin #3 is a Red wire and on Pin #2 is a Black wire...It is the same on Coil #2...Using two safety pins...Push the points into the Red and Black wires...First on coil #! then #2...Set your meter to read 12 volts...Clip the (+) meter probe to the safety pin in the Red wire and (-) to the Black...Turn on the key...12 volts must be present...You can check the other two coils that are firing...More than likely those two will read OK...This is a preliminary test to insure #1 & #2 have the proper voltage...Send a comment with results and I'll take it from there...Guru...Saailer
Try moving the coil pack from cylinder 1 to another cylinder (swap locations) and see if the same code comes up. If code is different, then coil pack is bad. Other reasons for miss; bad injector, poor compression. Also, I know you changed plugs already, but always use AC Delco 43-103 plugs on this vehicle.
If you have no firing issue, this can be caused by a faulty coil pack. If the coil pack is burnt, there will be no current supply to the spark plugs. One good reason why you are not burning fuel.
The coil pack is located inside the engine. Remove the cap where the plug wires are connected. Once you removed the cap you can gain access to the coil pack. Remember, removing the coil pack can be messy for it is connected to the engine. Have it replaced and you'll be good.
Looks like that the vehicle has fuel supply but doesn't fire. If that's the case, replace the coil pack. The coil pack gives current to the plug wires. Once there's current to burn you'll be good.
Hope this helps and thank you for using FixYa! Have a good one!
Check the spark plug first. then if the plug is good you wil need a digital ohm meter to test the coil pack. if you need to know how to remove the coil pack let me know, to test put on ohms should not have more than 2 1/2 ohms restance betweent coil lead to coil connector. If you test the coil pack on both sides of the pack and get a reading then the coil is bad, if it does not read then you haave a bad fireing plate diode.
I think SWOOP needs to check the car year poster said 2003, I don't know where my distributor would be, lol. And I think I've got coil PACKS not a coil, lol.
Doesn't anyone know the nissan proceedure to check for spark in a 2003 Sentra 2.5?
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