So it's always had an 02 sensor issue that was neglected. So as I stated its possible this neglect has caused your cat to foul up.The car has Plugs, cables and cap and rotor that were replaced less than a year ago - it's always had a light on since I bought it , the guy I bought it from said it was an 02 sensor yet the scanner at autozone didn't detect it .
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The main reason is because the codes don't show sensor , so there's that doubt and also , the car just started to misfire .So it's always had an 02 sensor issue that was neglected. So as I stated its possible this neglect has caused your cat to foul up.
If the code has been there why not put in a new 02 sensor and take it from there?
Yes it just started misfiring but the engine lights been on for a long time - the cap, cables and plugs are all new and this is why I amYou didn't mention it was misfiring, or maybe I didn't see it in your posts. All I gathered was you had it scanned and it showed those codes.
If it's misfiring check all ignition components. Distributor cap, rotor, plug wires, plugs and inspect your fuel injectors. Simple basic stuff first before going more advanced like head gasket, compression etc
Do you get a misfire for a specific cylinder? That'd be the place to investigate first
It was already specified....Which is downstream and which is up? Can someone specify the locations ?
How many miles is on this car?Upstream would be pre-cat
Downstream would be post-cat
182k and I'm not sure if they've ever been changedIt was already specified....
How many miles is on this car?
Have you considered having the valves adjusted?
Has it ever been done?
Valve adjustments, to get them back into spec, can cure a misfire.
Doesn't matter how new parts are. Check them. Quick test to rule out plug wires is to simply swap the #1 wire with another and see if the misfire moves to that other cylinder. Then investigate the injector.Yes it just started misfiring but the engine lights been on for a long time - the cap, cables and plugs are all new and this is why I am
Leaning towards injector , the scan reads coil 1. It will bean expensive experiment if I change it and it is not the problem. Which is downstream and which is up? Can someone specify the locations ?
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Excellent tips, I've also heard to move injector and tiger scanned to see if misfire moves as well. I'm going to attempt this , thanks .Doesn't matter how new parts are. Check them. Quick test to rule out plug wires is to simply swap the #1 wire with another and see if the misfire moves to that other cylinder. Then investigate the injector.
Quick test for that is to unplug then reseat. Friend's 99 civic had a misfire that doing so cured his issue.
With that many miles and it being unknown, you may want to look into having that done.182k and I'm not sure if they've ever been changed
its usually like that regardless of the generation the oil makes it harder for the plugs to receive the spark. electricity don't work so well in oilAnyway idk about the 6th gen but I know on the 4th gens if the valve cover gasket is bad then oil leaks into the spark plug well. Fouling out the plug and causing a misfire.
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