Re:2007 GMC Acadia SLT surging

2017 GMC Acadia surging when I accelerate going uphill ,checked o2 sensor data under load wot going up hill ,all o2 sensors are rich except for sensor b2 s1 , checked check ed o2 sensor wiring integrity check pins look good did a wiggle test did not find anything replace the o2 sensor but now it's doing the same thing after a couple of days

So is the downstream sensor fluctuating if you do a snap throttle as it goes up and back down on the O2 sensors?

What type of sensor did you use? OEM, Aftermarket, etc. Replace just the 1 bad one or a pair?

Any other work done prior to this? Was this a recently acquired used vehicle, owned it a long time or?

What are the fuel trims doing?



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Downstream is responding I only replaced the upstream bank 2

I'm one of those people that has a hard time explaining thingsvs sharing the information. This is a article I refer to at times when beating my head on a hood of a car.

IF you've got a scope by all means use that and you'll gain quite a bit.

Fuel trim numbers, what are they at in the various ranges?

Watch the part where they talk about running idle at various rpm's.

It's cold out in most of the U.S. now so you could very well have a intake leak depending on situation where a scan tool and propane bottle will give you quick answers in that regard.

I need to read my scannerdanner book again as I'm getting rusty as it's been about 5 yrs or so. Very worth the $$$ when or if you choose to make that choice.


Here's the link.

www.underhoodservice.com/fuel-trim-diagn...-sensor-performance/

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Problem seem to go away at this moment I guess it's intermittent