2000 Grand Prix 3800 Part Throttle SURGE trans???

**rschap1** · 10-20-2011

I did not initially un hook the battery when I swapped the sensors, but a few times since I have un hooked the terminals in order to clear codes. The second time I crossed the cables. I am not 100% sure that there is not another possibility, and I cannot say everything was 100% fine beforehand, but no SES light until the new sensor. That was the one thing different. I keep thinking that things will adjust to the new sensor, but I am hoping that the fact there was only one variable introduced and that was the sensor. Again, HOPE that is it, fingers crossed. I have not quit looking for other issues, but have not seen anything else suspect so far.

**BillBoost37** · 10-25-2011

If you read up on the code. Say at Gearchatter.com you'll find out tons of cool stuff and it'll make much more sense.

**rschap1** · 10-26-2011

Originally Posted by BillBoost37

If you read up on the code. Say at Gearchatter.com you'll find out tons of cool stuff and it'll make much more sense.

I gotta say THANKS
I have been reading through search results for the "P0171" and there has been plenty.
I learned quite a bit here and at gearchatter about how the engine control works and adjusts for my car. Really wish that I had a scan tool now too.
I appreciate the way that I was lead towards the resources too. Like teaching me to fish rather than just throwing a fish towards me, as the old sayings go

I am guessing that when I replaced the old MAF sensor with new and did not disconnect the battery, the old "trims" were in place. These were created with the faulty sensors input and conflicted with what was needed with the new proper sensor. Then I did clear the codes and trims when I pulled and crossed the cables. Again, now running from the baseline, trims were needed but not in place so SES light went back on. A few rides/cycles let the control adjust to the new sensor and everything has now meshed.
At least that is my "all is good" wishful theory.
I hope that sounds plausible

I hope that I am interpreting all the threads properly.
If not I appreciate any more clues that I may have walked right past.

BIG THANKS ! ! ! and PLEASE feel free to let me know if I totally missed the point and am all wet. Won't be the first (or last) time.

**BillBoost37** · 10-26-2011

Glad that approach worked for you. It seemed like you wanted to learn and may have wanted to be directed where to find the info instead of handing it to you.

There's a couple of places I do this.. P0171 can be a pain for a lot of people. I've tried to list out the very common things, but once in a while..it's not the easy fix. That's when reading up and interpreting what you may not have fully written out is key.

Once I learn how a code is triggered, I learn a lot more about what's going on and understand so much better how all the systems/codes mesh.

Take a P0401 EGR insufficient flow for example. Hit that up on Gearchatter and you'll find...most likely it's not a blocked EGR. It's not usually a non-functioning one either, cause that would toss more/other codes. While the code is named EGR, it's often a bad map sensor.

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