Car has a serious miss. It started the other day so I changed the plugs and it was running fine until earlier. Cleaned MAF, no change. Different coils, no change. Not sure what code it’s throwing but the CEL is on. Any common things to check first?
Last time it was scanned it said cyl2 had a misfire. The plugs fixed it for a little bit but I was thinking coils as well,until I swapped them out with mine and it didn’t fix it(I also have hitachi coils)
I’m about to just start digging into it,I mean the crank sensor looks like trash but wouldn’t that affect all 4 cylinders?
A cylinder specific misfire is a lot better to have than a random or multiple misfire.
There is a lot less possible causes.
Here's what the FSM says...
If you've got the same code, I would check the condition of the plug to see if it's fouled or burnt, and check the plugs gap.
(NGK V-Power, regular copper plugs give the strongest spark and they are dirt cheap but they need gapped or replaced more often)
I forgot whether or not it's cylinder 2 or 3 that has the coil, but check the connection between the coil and the sparkplug.
Carefully inspect the electrical connector that plugs into the coil for corrosion or bent terminals and check the wiring harness for any kind of crack or broken/damaged wire.
If it were me, I'd put dielectric grease on all the connections, including the 12V connector on the coils.
It helps prevent corrosion and arching/sparking.
You may have a leaking or fouled injector.
A fuel system cleaner may fix it or a new injector may be needed.
(inspecting the injector is a bit of a chore.)
I can't see a vacuum leak affecting only one cylinder ?
You may have low compression on that cylinder due to age and wear, or high compression due to carbon deposit buildup reducing the volume of the combustion chamber.
The fact that new plugs fixed the problem for a while says to me that you are very close to fixing the problem.