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Strange STFT spikes
- fj5gtx
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1 hour 39 minutes ago #93222
by fj5gtx
Strange STFT spikes was created by fj5gtx
2014 Chevrolet Cruze Eco 1.4 Turbo with 6spd Manual. 155k miles
After a P0299 code, checked the infamous boost check valve in the intake manifold to find it gone. Replaced valve cover and intake manifold. Car starts and runs pretty good. Clutch on the AC compressor cycles when at idle and engine rpm bounces. That could be a separate issue, so ignoring that for now and leaving the AC off.
No codes. Keeping the AC off, took a test drive with data logging. Using a Amazon bluetooth obd2 with the android Torque App to monitor and log. Looking at fuel trims, I'm seeing a strange STFT spike. Doesn't seem to change LTFT that I can tell.
Attached is a chart of my test drive. What could be causing the STFT to do that?
Thanks!
After a P0299 code, checked the infamous boost check valve in the intake manifold to find it gone. Replaced valve cover and intake manifold. Car starts and runs pretty good. Clutch on the AC compressor cycles when at idle and engine rpm bounces. That could be a separate issue, so ignoring that for now and leaving the AC off.
No codes. Keeping the AC off, took a test drive with data logging. Using a Amazon bluetooth obd2 with the android Torque App to monitor and log. Looking at fuel trims, I'm seeing a strange STFT spike. Doesn't seem to change LTFT that I can tell.
Attached is a chart of my test drive. What could be causing the STFT to do that?
Thanks!
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