Thread: Awkward issue out of Boost

Question for you hardcore turbo guys out there because I'm considering possibly driving my P10 out to Staggered in northern CT this weekend, I had the P10 sitting for about a week or so with the battery disconnected so it doesn't drain, and fired it up yesterday for a quick rip around the block, went to get some parts for the wife's car and came back home, well regardless while I was cruising (probably 3rd or 4th gear around 40-45mph probably between 2-3k rpms) at a few points I noticed the AFRs were dipping into the 10s and probably below that but the AEM UEGO doesn't read that low... Anyway I rev the car, it clears up and the AFRs come back up to the normal 13-15 while cruising, seems to build and hold boost with no issues in that department doesn't break up or anything of the sort under boostand the AFRs are perfect 10-12 in Boost, but since I don't always drive the car in boost the dipping AFRs while little miss daisy-ing the car was what concerned me....
Stock Lowport SR20DE with a bolted on GTi-R T28 set-up running STI injectors and a AEM 320lph pump dyno tuned on Nistune

Weather change nothing bad

LMAO Really??? Weather change has that much of an affect??? Because this did happen on the highway on the way to work this morning as well, definitely a cruising thing and once coming to the first traffic light after getting off the exit it dipped so rich it almost wanted to stall. I did scan it with consult at work today and did get a P0110 code for the Intake Air Temp Sensor which is new so I'll start there as well and see what happens.

was the car still cold? Your AFRs will be pretty rich until the car warms up.

Car was warm, I know the AFRs will be pretty rich upon initial start-up on a cold morning, but this was on the highway about halfway into work today that I noticed it on the highway while cruising and also when I got off the exit (14 mile ride to work with 1-2 miles local driving to get to the highway then from the exit to my destination). On a side note I do have a lead as what to try first, my IAT sensor has a badly broken wire that seems to pretty much be hanging off of the sensor, so I'll try replacing that first and see what she does. I know IAT Sensors have a tendency to bring the fuel trim to the rich side if they're bad or sensing improperly. Here's what I saw

IAT has no effect on ECU learning, it's informational only. How is your front O2 sensor?

front O2 seems good to me, I haven't been able to check or graph out its actual output readings, but I don't have any DTCs for it. I'll unscrew it and see if it's still in one piece and not burned up but with no code I think it should be fine.

are you only seeing the afr drop or is there hesitation also?

AFR Drop and a small stutter and or lack of power at the same time, seeing as when it's happening in lower RPMs cruising and or coming to a stopped idle(i.e. traffic light) I would think it's a closed loop thing, but it clears up and everything including AFR gets on point when I get on the gas a little.

its deff normal for u to see rich afr after you let of the throttle. that's a rich dump but you deff shouldn't see it drop during consistent throttle.

im wondering if your MAF signal isn't within spec at the time when this happens