'98 LTFT + STFT questions
06-06-2011, 09:58 PM
#1
'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?
06-06-2011, 10:29 PM
#2
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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; 06-07-2011 at 05:58 AM.
06-07-2011, 05:57 AM
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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; 06-07-2011 at 07:05 AM.
06-07-2011, 08:54 PM
#5
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.
