Misfire code when not actually misfiring
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I would check the ignition system by attaching an inductive timing light to each spark plug wire while the engine is running and observing the nature of the strobe light at idle, at 4K RPMs, and while revving to redline. In all cases the strobe should flash brightly and steadily. This test works on OEM and aftermarket coils and only conclusively demonstrates there to possibly be a problem with the coils, the wires, the harness, the spark plugs, or the PCM and each potential must be subsequently further tested/verified.
Odd. I've got popping but no codes. As far as ignition goes, BHR koolaid. Not to detract from the post. But I should say my popping is between shifts? Or between rapid acceleration and then letting off the gas. Or it might be this giant *** exhaust I've got on here.
Odd. I've got popping but no codes. As far as ignition goes, BHR koolaid. Not to detract from the post. But I should say my popping is between shifts? Or between rapid acceleration and then letting off the gas. Or it might be this giant *** exhaust I've got on here.
My popping was while trying to give it gas, not letting off.
You're probably shooting flame.
That is not how you do a cat efficiency test and a much harder way of "testing" a cat. But this kind if thing is why no one touches my car but me.
Last edited by 9krpmrx8; Nov 22, 2016 at 03:16 PM.
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Just changed coils, wires, plugs
Do you have the actual codes?
I've been on this forum nearly 4 years,
I've read about problems nearly every day since then, and I don't think I've ever heard of a recurring CEL that was a ghost in the machine.
Your's would be the first.
If your coils, wires, and plugs have not been changed in 30k miles, then it should be done.
If you have had CELs popping up for an extended time, and it is misfires, your cat could be damaged.
The ignition components can be replaced, but if the cat is damaged, it can cause misfires as a result.
It should be dropped and visually inspected.
Misfires kill cats, bad cats kill engines.
In your first post you said you value our feedback, but you insist your mechanic is right.
If we're right, changing the ignition will cost a couple hundred bucks, and maybe if your cat isn't already bad, that will solve your problem.
If your mechanic is wrong, it'll cost you a couple of thousand at best.
Your call.
I've been on this forum nearly 4 years,
I've read about problems nearly every day since then, and I don't think I've ever heard of a recurring CEL that was a ghost in the machine.
Your's would be the first.
If your coils, wires, and plugs have not been changed in 30k miles, then it should be done.
If you have had CELs popping up for an extended time, and it is misfires, your cat could be damaged.
The ignition components can be replaced, but if the cat is damaged, it can cause misfires as a result.
It should be dropped and visually inspected.
Misfires kill cats, bad cats kill engines.
In your first post you said you value our feedback, but you insist your mechanic is right.
If we're right, changing the ignition will cost a couple hundred bucks, and maybe if your cat isn't already bad, that will solve your problem.
If your mechanic is wrong, it'll cost you a couple of thousand at best.
Your call.
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I would check the ignition system by attaching an inductive timing light to each spark plug wire while the engine is running and observing the nature of the strobe light at idle, at 4K RPMs, and while revving to redline. In all cases the strobe should flash brightly and steadily. This test works on OEM and aftermarket coils and only conclusively demonstrates there to possibly be a problem with the coils, the wires, the harness, the spark plugs, or the PCM and each potential must be subsequently further tested/verified.
So tell me again why you think the cat "is fine"? Until you/they actually diagnose the problem, they are just diagnosing by parts replacement. I'd find a competent mechanic.
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