cylinder 2 misfire 97 expedition 4.6L
#1
cylinder 2 misfire 97 expedition 4.6L
i dont know if there is already a post in the forums about this issue, there are 502 pages so it would take about 6 days to read them all. here is my question:
i have had a check engine light for some time. i changed my plugs and wires this past weekend and my check engine light went away. was on my way to emissions this morning, first time driving further then a 1/4 mile since changing plugs and wires, and check engine light came back on. had it checked and got a misfire code for cyl 2. changed out the coil pack and the #2 plug (again) and still getting engine light. now looking into the possibility of it being a fuel injector. does anyone have any insight on alternatives to fuel injectors or a way to test them so i am not buying unnecessary parts left and right?
some symptoms are:
rough idle
occasional bogging down in idle (does not shut of the engine, just slows down rpm's)
hesitation on acceleration
greater power loss under greater load
unpredictable exhaust popping (not a backfire, just like it is choking)
your help is much appreciated.
thanks.
i have had a check engine light for some time. i changed my plugs and wires this past weekend and my check engine light went away. was on my way to emissions this morning, first time driving further then a 1/4 mile since changing plugs and wires, and check engine light came back on. had it checked and got a misfire code for cyl 2. changed out the coil pack and the #2 plug (again) and still getting engine light. now looking into the possibility of it being a fuel injector. does anyone have any insight on alternatives to fuel injectors or a way to test them so i am not buying unnecessary parts left and right?
some symptoms are:
rough idle
occasional bogging down in idle (does not shut of the engine, just slows down rpm's)
hesitation on acceleration
greater power loss under greater load
unpredictable exhaust popping (not a backfire, just like it is choking)
your help is much appreciated.
thanks.
#2
#3
And while your in there, swap the plug with cylinder #1 and the coil with cylinder #3 and the injector with cylinder #4. (Wait! Does this thing have coil-on-plug? If it has coil packs switch them from left to right and swap out the sparkplug wire with another cylinder that is about the same length.)
#4
#5
Well, all I was trying to do is be sure the new coil and plug were not at fault. You know - while he was right there.
And post #1 didn't sound like the sparkplug wire was swapped just in case the wire was at fault.
BTW tkobe, I had a Town Car in the shop a few months ago with coil-on-plug that had a cylinder #2 misfire. After swapping parts (coils, springs, plugs, and injectors) around cyl #2 still misfired. Finally tracked it down to some green growth on pin #104 of the 104-pin connector at the PCM. This is the circuit that the PCM uses to pull the #2 injector to ground and it was struggling to hold the injector open for the full duty cycle. After cleaning the connection all was good.
And post #1 didn't sound like the sparkplug wire was swapped just in case the wire was at fault.
BTW tkobe, I had a Town Car in the shop a few months ago with coil-on-plug that had a cylinder #2 misfire. After swapping parts (coils, springs, plugs, and injectors) around cyl #2 still misfired. Finally tracked it down to some green growth on pin #104 of the 104-pin connector at the PCM. This is the circuit that the PCM uses to pull the #2 injector to ground and it was struggling to hold the injector open for the full duty cycle. After cleaning the connection all was good.
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