Quote:
Originally Posted by isaiah990
The metal rapping sound is what I’m trying to figure out, I thought it was part of the misfire
-I’ve swapped coil packs and the misfire remains on cylinder 4
-cylinder misfire occurs constantly after 15 seconds when idle rpm drops on cold start
-When I unplug coil pack #4 right after I start the car it causes it to stall. When I unplug the same coil pack after the misfire occurs or 15 seconds after start it has no effect on the idle
Could this noise be a failing injector?
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I'm fairly confident that metal rapping sound is not from the engine itself. That would be an extremely alarming sound to come from the engine core.
Almost certainly from a belt-driven accessory or pulley.
...unless your valve spring broke...
I notice you have 2013 FRS.
A broken valve spring or non-operational valve would explain pretty much all of these symptoms.
Wouldn't quite explain the whole 15sec thing though.
At this point, I suppose it's pointing more towards an injector issue.
I guess make sure there isn't an injector plug loose.
Again, not trying to be vague, but these audio/video diagnoses suck with the poor audio quality. Very hard to determine exactly where the noise is coming from. Like higher, lower, left, right, etc.
Why don't you use a stethoscope or long screwdriver to determine more specifically where the noise is coming from