HELP - Intake Air Temperature 98 LS400
#1
Driver
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HELP - Intake Air Temperature 98 LS400
Is there an intake air temperature sensor or is it built into the MAF sensor on this year? I did a live scan with the car running and the IAT is reading 125 degrees in 70 degree weather. Please, let me know if I am buying an IAT sensor or a MAF with the IAT built into it. Thanks. I believe I will be buying a MAF sensor with the IAT built into it.
Last edited by Michael88; 08-17-18 at 05:52 PM.
#2
Is there an intake air temperature sensor or is it built into the MAF sensor on this year? I did a live scan with the car running and the IAT is reading 125 degrees in 70 degree weather. Please, let me know if I am buying an IAT sensor or a MAF with the IAT built into it. Thanks. I believe I will be buying a MAF sensor with the IAT built into it.
But if it's reading 125 degrees when the engine is completely cold then you're right to replace the MAF sensor. IAT is built into it
#4
Moderator
Is there an intake air temperature sensor or is it built into the MAF sensor on this year? I did a live scan with the car running and the IAT is reading 125 degrees in 70 degree weather. Please, let me know if I am buying an IAT sensor or a MAF with the IAT built into it. Thanks. I believe I will be buying a MAF sensor with the IAT built into it.
#5
Driver
Thread Starter
I replaced the MAF sensor due to an IAT code. I also replaced the driver's side upstream O2 sensor due to a bank 1 S1 code. So far, this LS400 has started 40+ times without a single intermittent no start. The only code that I did not address was a PPS/TPS sensor code, with the logic that these other sensors might have been "pushing the throttle" beyond its acceptable limits. I erased the codes and reset the computer, of course. No codes so far. Other electrical funny business like delays in the telescoping steering wheel have gone away. I speculate the O2 sensor had a short in it. I must share this. I ignored the O2 sensor code when it first appeared knowing it was something that could slide until I could do it. Thinking back, I bet I ignored this for nearly ten years and didn't see much of a decrease in mpg. Guys don't make the same mistake I did, and tell yourself the O2 sensor can be ignored then file that problem away. I am still considering ECU capacitors, but if I no longer have problems then I can have time to practice my soldering skills first.
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