Ignition problems and other causes of misfire can also lead to afterfire. If it's really backfiring (intake), that can lead to damage of things (such as sensors) there, which could rapidly make the symptoms worse.Īn overly-rich mixture could be the cause of afterfire, but a lean mixture can be the reason as well since it can lead to misfire. True backfire doesn't tend to happen with fuel-injected systems. As you might expect, backfiring is when the mixture gets ignited in the intake afterfire is when there's sufficient unburned fuel in the exhaust to be ignited there.
Example: code P0302, not "Cylinder 2 Misfire Detected".īy the way, the "backfire" mentioned is more likely "afterfire". #4?Īgreed, get the diagnostic code(s) read (there may be more than one), and get back to us with any and all of them, not the code definitions. Bad plugs/wires? If the plugs have carbon build-up, are the wires toast too? And how the flip can I get to the plug on cyl. PCV? I'll grab one tomorrow - it's 5 bucks and it probably needs it anyway. So here's what I'm thinking (let me know if I'm wrong): It idles normally, but any more load than that and it runs badly. When it starts to run roughly, the CEL flashes. Apparently there is no EGR valve, so that's out. I have looked for vacuum leaks, but to no avail (I haven't done the propane test). Above that, it smooths out, but still lacks the power it used to have. Backfiring happens in every gear below 3k RPMs. so now I'm back, I've driven it two more days and the symptoms are much worse. It all began about 1k miles ago (at the beginning of a 900-mile road trip), with a slight hesitation on hills, and a backfire every now and then.
I've owned the car for the last 8k miles - maintenence before that is not well documented, so.?
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