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I'm ready to pull out what's left of my hair. My n/a 2000 3.3 with 123K miles has had a miss for a while. It started as the multiple cylinder misfire. I changed the plugs, checked resistance on the wires, renewed the dielectric grease on the wire connections, changed the fuel filter, which looked like it had mud in it, changed rotor, cap and upper distributor bearing. Cleaned the MAF sensor. After those attempts, I was down to "just" a cylinder 3 misfire, which makes me think I was chasing more than one problem and corrected the others.
Changed the cylinder 3 injector. Nothing changed. I still have the cylinder 3 and perpetual knock sensor codes.
I didn't use NGK plugs, but the ones I replaced before the code also weren't NGK. So if you're going to scold me for not using OEM plugs, you better give me a reason only the one in the cylinder 3 hole is misfiring. It's definitely getting spark. I checked it with an ignition spark tool. Just for grins, I'll swap the cylinder 1 and 3 plugs today.
I haven't checked compression, but there are none of the other signs of a leaking head gasket.
I can't believe the coil could cause a single cylinder misfire, but I'll listen to reason.
I haven't checked fuel pressure, again thinking that couldn't cause a problem with a single cylinder which has a new injector.
Can you help a brother?
Changed the cylinder 3 injector. Nothing changed. I still have the cylinder 3 and perpetual knock sensor codes.
I didn't use NGK plugs, but the ones I replaced before the code also weren't NGK. So if you're going to scold me for not using OEM plugs, you better give me a reason only the one in the cylinder 3 hole is misfiring. It's definitely getting spark. I checked it with an ignition spark tool. Just for grins, I'll swap the cylinder 1 and 3 plugs today.
I haven't checked compression, but there are none of the other signs of a leaking head gasket.
I can't believe the coil could cause a single cylinder misfire, but I'll listen to reason.
I haven't checked fuel pressure, again thinking that couldn't cause a problem with a single cylinder which has a new injector.
Can you help a brother?