Thread: Can a bad O2 sensor cause a misfire code?

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  1. #1 Can a bad O2 sensor cause a misfire code? 
    GT Level Member Spartanzz's Avatar
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    So i had the ses codes read about a week or two ago and there were two...one for a cylinder 3 misfire and the other for the bank 1 system is too lean...my question is i just bought a new O2 sensor cuz i figure it needs one anyway but can a lazy/old O2 sensor sensing its too lean cause a misfire?
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  2. #2 Re: Can a bad O2 sensor cause a misfire code? 
    The mod from over yonder TheOtherNick's Avatar
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    more than likely its the number 3 inector swap it with 1 or 5 and see if the miss moves.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  3. #3 Re: Can a bad O2 sensor cause a misfire code? 
    GT Level Member Spartanzz's Avatar
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    ok ill try and give that a shot. But, say the O2 sensor is reading its running to lean all the time is it possible that its trying to put in more fuel all the time to correct it and its just drowning out the spark plug? because i also get pretty bad gas milage so far i just ran it till the display read LOW and thats was at 195 miles or something like that. We thought this could be a possibility.
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  4. #4 Re: Can a bad O2 sensor cause a misfire code? 
    GTP Level Member 01gpgt01's Avatar
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    vac leak. Lean bank 1 is almost always a vacuum leak. It would also explain your crappy mileage
    Last edited by 01gpgt01; 12-25-2010 at 11:16 PM.
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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  5. #5 Re: Can a bad O2 sensor cause a misfire code? 
    The mod from over yonder TheOtherNick's Avatar
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    he has a single cylinder miss tho.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  6. #6 Re: Can a bad O2 sensor cause a misfire code? 
    GT Level Member Spartanzz's Avatar
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    hmmmm well i havent had this car very long maby a few weeks now and we are just trying to settel a few things with it and this seems to be the most anoying...i will give swapping the injectors and run up to advanced and have them read the codes but kinda hoping its not an injector because i dont have money to get one lol i have all ready ordered the O2 sensor cuz we had a theory it could be that plus i ordered the zzp supercharger coupler. but if it were a vac leak where is the most typical place to look for the leak?
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  7. #7 Re: Can a bad O2 sensor cause a misfire code? 
    The mod from over yonder TheOtherNick's Avatar
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    spray around with carb cleaner.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  8. #8 Re: Can a bad O2 sensor cause a misfire code? 
    GT Level Member Mitchstrp's Avatar
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    1.8 RR's, Speed daddy headers, 180 stat, Open Cone, GBP tune, 3.5 pulley, and ported blower.
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  9. #9 Re: Can a bad O2 sensor cause a misfire code? 
    GTP Level Member 01gpgt01's Avatar
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    Maybe the leaks leaning out the cylinder causing a miss. Ive not had that But ive heard of people experiancing that. Anywho thats where id start. Id bet 100 dollars the 02's not the issue.
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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  10. #10 Re: Can a bad O2 sensor cause a misfire code? 
    GT Level Member Vegas~Blown's Avatar
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    Quote Originally Posted by Spartanzz View Post
    if it were a vac leak where is the most typical place to look for the leak?
    don't know what year the car is but there's a vacuum t under the SC snout that tends to split over time. it's part of a vacuum harness that goes from the bbv, fpr, under the snout over to the map. they're like $15 at the GM store.

    the #3 misfire might be related but it also could be a plug or wire, something like that.
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  11. #11 Re: Can a bad O2 sensor cause a misfire code? 
    GT Level Member Spartanzz's Avatar
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    Ok so today I went and bought a can of carb cleaner and started spraying and for a hole in the vaccume line right above the sc. I sprayed there and the engine changed rpm. So what I did was repeat the pipe in the hose and tightened the clamp and sprayed it again. It didn't change rpm after that and I sprayed in more places but didn't hear change. I'm not 100% sure if I did it right so how would I know if the leak was fixed? And for the record its a 1997 grand prix gtp
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  12. #12 Re: Can a bad O2 sensor cause a misfire code? 
    GT Level Member Spartanzz's Avatar
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    Ok guys so i checked the T under the snout and the hose that connected it to the manifold was loose enough to basically pull off with no force so i got a clamp on that and i actually noticed the engine builds boost faster and it seems to have a bit more power. So now im gunna let the car warm up and stand near the exhaust and listen for the puffs of a misfire that i have. Is there any easier way to check for a misfire?
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  13. #13 Re: Can a bad O2 sensor cause a misfire code? 
    I GIVES MONIEZ JoshsGTP's Avatar
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  14. #14 Re: Can a bad O2 sensor cause a misfire code? 
    GTP Level Member 01gpgt01's Avatar
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    no load idle misfires are common in these dinosour engines. Esp when you start moding. Mine has a mis while idling
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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  15. #15 Re: Can a bad O2 sensor cause a misfire code? 
    GT Level Member Vegas~Blown's Avatar
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    how old are the plugs and wires?

    towers on the coils corroded?

    you won't learn much by listening to the exhaust --- you can, most times, tell a lot by looking at the plugs.
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  16. #16 Re: Can a bad O2 sensor cause a misfire code? 
    GT Level Member Spartanzz's Avatar
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    well i havent pulled the plugs just yet and im not sure how old they are or the wire are. if i can i plan to get a set within the next couple days when i get paid just to be safe but after i fixed the leak the puffing from the misfire is now not as often or at least i haven't head it as often but like i said im gunna try and replace the plug and wires real soon
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  17. #17 Re: Can a bad O2 sensor cause a misfire code? 
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    don't know the miles on the car but i doubt it would suffer from wires and plugs. You should be able to get there for less than $50. (i just got a set of delco gtp wires for $14 from rock on clearance pricing).

    do yourself a favor ---- keep track of the plugs as they come out. they should, above all, look all close to the same. you'll learn a lot on how your car is running after looking at your plugs.
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  18. #18 Re: Can a bad O2 sensor cause a misfire code? 
    I AM PEWPIN! rynoman03's Avatar
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    Change your plugs and wires. Cheap maintenance. Then replace that t fitting your put a clamp on. Check the bolts on the sensors on the Throttle body and make sure they are tight and the TB is tight on the SC. If any of your vac. line rubbers look cracked or corroded replace them.

    As for the o2 Sensor yes it can cause bad fuel mileage and lean conditions but most of the time bank 1 lean is a vac leak.
    1999 GTPHP Tuned, Ported SC/TB, 42#'s, SSAC's, ZZP Modded 1.9's/LS6 Springs/Manley's, TransGo Shift Kit, Poly Uppers, KYB GR2's/Springtech's. - 231k and traded it in. - Gone
    2000 GTP: XP, P&P'd Heads, N*\Lq4 MAF, GenV, 42#'s, PRJ Rails\FPR, Racetronix, TEP w/ 3.29 Gears, 300m, 7/8" chain, SSAC's. - Collecting dust in my garage.
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