Dear Experts here im attaching log of 1SZ-FE, 1.0L engine for your kind consideration, please advice why my LTFT remains in -ive though MAF, Intake Air Temp sensor, ECT sensor and O2 sensor is working fine, also i had a compression test which is 170psi for each cylinder.

Request for your valuable comments and suggestions please.


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  • If it's negative, the computer believes that you're running a little rich. That could be due to a leaking injector (too much fuel) or air delivery (not enough air). But, I'd probably not worry too much about a 3% offset on LTFT. If your STFTs are very negative, it might be a real problem. – 3Dave Nov 16 '20 at 18:44
  • Also, is it really 52º C where you are? That's insane. – 3Dave Nov 16 '20 at 18:46
  • Im from Pakistan, in my place now a days lowest temp is around 8 degree Celsius. – Asghar Dev Nov 17 '20 at 4:14

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