When to replace o2 sensors

JARblue · 09-09-2016, 10:27 AM

That sure sounds like VDC kicking in. But unless you're boosted, you don't get wheel slip at 60 mph even if you're in the power band in 3rd gear with bald tires. Plus you said VDC is off and it still happens

AestheticCM1 · 09-09-2016, 10:57 AM

Quote:

Originally Posted by JARblue

That sure sounds like VDC kicking in. But unless you're boosted, you don't get wheel slip at 60 mph even if you're in the power band in 3rd gear with bald tires. Plus you said VDC is off and it still happens

...unless its sub 60 F outside (even with fresh rubber). With low tread, I've had the tires break loose and VDC kick in gears 3 and 4 around 60mph at temps from 40 - 90 degrees, and I'm not boosted. Since, it's summer and the OP's tires are new, the scenarios I've described clearly aren't the cause though.

Perhaps the new tires are badly aligned?

Jsolo · 09-09-2016, 11:02 AM

Quote:

Originally Posted by Z_ealot

Would this cause a hesitation in acceleration? My scantool doesnt have the ability to pick up on the pre cat o2 sensors, but from what i can gather from the stft and ltft it seems like the sensors are functioning, like you said though they could just not be responding quick enough which is what i suspect might be happening

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Sure, O2 response plays a huge role in fueling. If the o2 is lazy, throttle response will suffer. I'd start by cleaning the throttle bodies then go from there.

Z_ealot · 09-09-2016, 11:15 AM

Quote:

Originally Posted by AestheticCM1

...unless its sub 60 F outside (even with fresh rubber). With low tread, I've had the tires break loose and VDC kick in gears 3 and 4 around 60mph at temps from 40 - 90 degrees, and I'm not boosted. Since, it's summer and the OP's tires are new, the scenarios I've described clearly aren't the cause though.

Perhaps the new tires are badly aligned?

Had an alignment done not to long after i got the tires mounted

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Z_ealot · 09-09-2016, 11:17 AM

Quote:

Originally Posted by Jsolo

Sure, O2 response plays a huge role in fueling. If the o2 is lazy, throttle response will suffer. I'd start by cleaning the throttle bodies then go from there.

Gave the throttle bodies a thorough cleaning when i picked the car up so i guess that leaves just one thing...well technically 2 since there is one for each side lol....question though, will a lazy o2 sensor harm the new cats in any way?

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Spooler · 09-09-2016, 11:34 AM

What brand and model tires did you buy?

JARblue · 09-09-2016, 11:39 AM

Quote:

Originally Posted by AestheticCM1

...unless its sub 60 F outside (even with fresh rubber). With low tread, I've had the tires break loose and VDC kick in gears 3 and 4 around 60mph at temps from 40 - 90 degrees, and I'm not boosted. Since, it's summer and the OP's tires are new, the scenarios I've described clearly aren't the cause though.

Texas boy here. We don't have much experience with sub-60F temps

I should have clarified environmental factors being consistent and not detrimental (like rain or cold).

Z_ealot · 09-09-2016, 11:47 AM

Quote:

Originally Posted by Spooler

What brand and model tires did you buy?

Firestone firehawk indy 500, should note that the car has been doing this even with a different set of tires that were good

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Jsolo · 09-09-2016, 12:11 PM

Quote:

Originally Posted by Z_ealot

Gave the throttle bodies a thorough cleaning when i picked the car up so i guess that leaves just one thing...well technically 2 since there is one for each side lol....question though, will a lazy o2 sensor harm the new cats in any way?

I'd probably get it taken care of sooner than later. Your mileage should improve too.

Z_ealot · 09-09-2016, 12:13 PM

Quote:

Originally Posted by Jsolo

I'd probably get it taken care of sooner than later. Your mileage should improve too.

Well my mileage already improved pretty dramatically when i swapped out the cats lol

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Z_ealot · 09-09-2016, 04:32 PM

Quote:

Originally Posted by Jsolo

I'd probably get it taken care of sooner than later. Your mileage should improve too.

Dont know if this helps in any diagnosis, but the hesitation only seems to occur when everythings warmed up. Before that if i pin the throttle i get no hesitation at all, forgot to mention that before

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Jsolo · 09-09-2016, 07:14 PM

Car is in open loop mode prior to engine reaching operating temp. Once in closed loop, feedback from o2 is monitored and fuel adjusted accordingly.

Z_ealot · 09-09-2016, 07:34 PM

Quote:

Originally Posted by Jsolo

Car is in open loop mode prior to engine reaching operating temp. Once in closed loop, feedback from o2 is monitored and fuel adjusted accordingly.

Guess it's a good thing i found our o2 sensors for less then $100 on amazon lol....one last question though, would the throttle response get worse as the o2 sensors heated up even more, like say as oil temps moved beyond 200 degrees or an extra load was put on the engine like ac being turned on?

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TreeSemdyZee · 09-09-2016, 09:55 PM

Clean your MAF sensors.

Z_ealot · 09-09-2016, 10:01 PM

Quote:

Originally Posted by TreeSemdyZee

Clean your MAF sensors.

One of the first things i did after i got the car and cleaned them again last month...maf sensors are reading correct according to scantool

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09-09-2016, 10:27 AM	#16 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,449 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	That sure sounds like VDC kicking in. But unless you're boosted, you don't get wheel slip at 60 mph even if you're in the power band in 3rd gear with bald tires. Plus you said VDC is off and it still happens Ghostvette likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

09-09-2016, 07:14 PM	#27 (permalink)
Jsolo Track Member Join Date: Dec 2011 Location: chicago Posts: 783 Drives: '12 G37 6MT Rep Power: 14	Car is in open loop mode prior to engine reaching operating temp. Once in closed loop, feedback from o2 is monitored and fuel adjusted accordingly. __________________ G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring For sale links

09-09-2016, 09:55 PM	#29 (permalink)
TreeSemdyZee Premium Member Join Date: Dec 2009 Location: Kentuck-IANA Age: 59 Posts: 4,880 Drives: '09 370 & ‘14 Juke Rep Power: 27408	Clean your MAF sensors. __________________ Borla S-Type \| Motordyne \| Z1 (lots) \| South Bend \| K&N \| Nismo/Nismo S-Tune \| Eibach \| Aerojacket \| Fujimara \| Spl \| ZSpeed Performance \| Kenwood-Infinity-Sound Ordnance \| Whiteline \| Ecutek \| Hotchkis \| Clazzio \| VQ Vortex \|Morimoto XB \|Dynosty Tune 329.64hp 265.73 ft/lb

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09-09-2016, 11:34 AM	#21 (permalink)
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