techtx
Probationary Member
- 3
- 0
- Jun 30, 2019
-
Humble,
Texas
I just recently got my car back from a tuner. It runs great at WOT and cruising but was never the best at idling. Sometimes when the rpms drop to idle the vehicle would stall. This became more and more common as the weeks have gone by. In my attempts to diagnose the issue I think the culprit is that I had an old autometer air fuel ratio gauge still running off the O2 sensor pin. This auto meter air fuel ratio gauge was installed years ago and was running off the narrowband O2 sensor. Just before I sent the vehicle to the tuner I installed the LC2 wideband sensor in place of the original O2 sensor. I installed the innovate wide band gauge as well not thinking it would matter if I removed the old autometer AFR gauge. I believe the old autometer gauge is affecting the actual readings from the wideband O2 sensor to the ECU and my tuner compensated for the readings and still was able to tune the vehicle. I understand this is completely 100% my issue and I am not blaming anyone else but myself.
So here I my actual dilemma. With the old gauge installed, the car will actually run nicely except for the idle. When I disconnect the old AFR gauge and recalibrate the O2 sensor before running. The wideband signal will cycle around 13.0, it never comes out of open loop and will not simulate a front O2 sensor signal (front 02 voltage will stay pegged at 0.8V). I can then plug in the old autometer AFR gauge recalibrate the wideband O2 and the car will go back to cycling around 14.7 AFR, drop into closed loop at idle and will simulate a cycling narrowband signal for the front O2 (0.2V to 0.8V).
I am attaching 3 logs. The first is the log with both the autometer AFR gauge and innovate AFR gauge installed (the way it was tuned). AFR gauge was cycling around 14.7 and I took a trip out of the neighborhood and did a 2nd and 3rd gear pull. When I made the uturn the engine stalled when coming to a stop and that’s the end of the log. The 2nd log was started just after that, I started the car and it attempted to idle but immediately stalled. The 3rd log is with only the innovate AFR gauge installed, O2 sensor recalibrated and just idling in the garage.
I understand its just as easy to take the car back to the tuner and start all over again. And I will, but this is technically just my engine break in tune. After I put a thousand miles or so on the engine I’ll be taking it back. In the mean time is my issue something that I can fix relatively easily so I can continue breaking in the engine.
I’m sure there is information I am forgetting. Please don’t hesitate to ask. Or maybe i'm over thinking the whole thing...
Thanks in advance for the help.
So here I my actual dilemma. With the old gauge installed, the car will actually run nicely except for the idle. When I disconnect the old AFR gauge and recalibrate the O2 sensor before running. The wideband signal will cycle around 13.0, it never comes out of open loop and will not simulate a front O2 sensor signal (front 02 voltage will stay pegged at 0.8V). I can then plug in the old autometer AFR gauge recalibrate the wideband O2 and the car will go back to cycling around 14.7 AFR, drop into closed loop at idle and will simulate a cycling narrowband signal for the front O2 (0.2V to 0.8V).
I am attaching 3 logs. The first is the log with both the autometer AFR gauge and innovate AFR gauge installed (the way it was tuned). AFR gauge was cycling around 14.7 and I took a trip out of the neighborhood and did a 2nd and 3rd gear pull. When I made the uturn the engine stalled when coming to a stop and that’s the end of the log. The 2nd log was started just after that, I started the car and it attempted to idle but immediately stalled. The 3rd log is with only the innovate AFR gauge installed, O2 sensor recalibrated and just idling in the garage.
I understand its just as easy to take the car back to the tuner and start all over again. And I will, but this is technically just my engine break in tune. After I put a thousand miles or so on the engine I’ll be taking it back. In the mean time is my issue something that I can fix relatively easily so I can continue breaking in the engine.
I’m sure there is information I am forgetting. Please don’t hesitate to ask. Or maybe i'm over thinking the whole thing...
Thanks in advance for the help.