'98 LTFT + STFT questions
'98 LTFT + STFT questions I'm 'playing' with a few options now that I have 90% of my tune done. I was toying around with the idea of disabling the LTFT. However, when I did, I noticed that in my logs the STFT remained at 0, as well. What I did in my tune was to set the LTFT to 'Disable' on the OL/CL tab, and set the LTFT enable temperature to 280. Is this high temp also disabling the STFT?
Setting the CL temp enable to 280*F puts the car in open loop (no fuel trims). At that point, you need to rely on a WBO2 sensor to tell you if commanded equals actual AFR or not as the PCM is not paying any attention to the factory O2 sensors.
Last edited by SSpdDmon; Jun 7, 2011 at 05:58 AM.
When I disable LTFTs I just toggle the enable/disable switch.
I'm 'playing' with a few options now that I have 90% of my tune done. I was toying around with the idea of disabling the LTFT. However, when I did, I noticed that in my logs the STFT remained at 0, as well. What I did in my tune was to set the LTFT to 'Disable' on the OL/CL tab, and set the LTFT enable temperature to 280. Is this high temp also disabling the STFT?
Last edited by SSpdDmon; Jun 7, 2011 at 07:05 AM.
I left the closed loop enable temp alone, I changed the LTFT enable temp. I changed it back, and left the LTFT switch on disabled. I'm definitely in closed loop, so the STFT must be working.
I can do more testing tomorrow when I get home from my 24 hour shift at the firehouse and replace my noisy alternator. I thought the squeak was one of the idler pulleys, so I re-greased the bearings in all of them only to discover that it's the front bearing in the alternator that's gone dry.
I can do more testing tomorrow when I get home from my 24 hour shift at the firehouse and replace my noisy alternator. I thought the squeak was one of the idler pulleys, so I re-greased the bearings in all of them only to discover that it's the front bearing in the alternator that's gone dry.
