When to replace o2 sensors

Z_ealot

Cleaned those when i first got the car, inspected them just this last weekend and not very much buildup on them. Only things i can think of that might cause the hesitation are a vacuum leak, dirty fuel injectors or possibly a faulty abs sensor. I've looked for a vacuum leak before and couldnt find anything, but that doesnt mean there isn't one, im running fuel injector cleaner through the gas tank right now so i suppose we'll see if that helps and the only reason i mention anything about the abs sensors is because when i have vdc turned on i get a wheel slip light along with the slight hesitation. Car runs perfect otherwise, just going crazy trying to track down the cause of the hesitation


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JARblue

Did you check the back side of the butterfly valve on the throttle bodies? I've cleaned mine twice in 80K miles - the first time I didn't think they were even that dirty until I actually removed them and looked at the back side

Also, VDC will brake for you when wheel slip is detected, and it will cut throttle if you continue trying to accelerate during wheel slip. Even if you turn VDC off, the ABLS system will still pulsate the rear brakes when wheel slip is detected, although you can overpower ABLS with throttle.

Lastly, I assume this hesitation is new to you? Because the throttle lag on the stock tune is horrid. A tune will fix that right up if you haven't already.

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Z_ealot

Checked the back of the butterfly valve on the throttle body, was nice and shiny, throttle lag isnt new to me, but what im feeling isnt that. Basically what happens is this: cruising along on freeway doing 60, pin the throttle to the floor, first second car starts to take off, then the next second or so it feels like the engine cuts power, followed by full power restored all the way to redline. These symptoms are made even worse when vdc is turned on as when i lose that power from the engine for that second the wheel slip light will turn on and sometimes stays on up till about 2000rpm before redline. Tires are new so i know they have plenty of grip


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barncobob

don't PIN it, problem solved..