I would be looking at either the ignition system or fuel related Can you give year make a model of the vehicle and the mods? An exhaust leak ahead of the o2 sensors will cause the ecm to add fuel as it sees a lean condition due to the air entering the system after the maf You may even experience a drop in gas mileage It might cause a misfire but i'm not sure of that It is important to correct those leaks anyways
Hey, mine light turned on today, checked it at murrays and code for misfire on 8 I have a leak before the muffler and its been runnin a litle rough for a while. 864fastasfboy can exhaust leak cause Misfire like i said in recent post changed plugs , wires, coils, mass air flow etc but i didn't have a exhaust gasket when i put my exhaust back on will that cause a misfire it's only on cylinder 8 5.3 vortex I'm aware i do have a crack in my exhaust manifold/header So i was wondering, could that be the cause of the misfire?
It normally seems to happen at freeway speeds but i have never noticed any amount of performance change If you're experiencing a misfire, it might be worth checking for an exhaust leak Learn more about how an exhaust leak can cause a misfire in this article. Yes, an exhaust leak can cause a misfire if it is in the right area but not back at the muffler Do you have any pending codes for o2 sensors? The exhaust leak did not cause an immediate misfire
The first sign of an exhaust leak is often heard One purpose of the exhaust is to expel the exhaust gases out of the back of the vehicle Any exhaust leak that is located ahead of the oxygen sensors can allow fresh air to enter the exhaust system.
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