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  1. 2001LC

    New OEM fan clutch but still roaring dump truck?

    Long term fuel trims are showing "what" ECU is doing, to correct fuel trim to achieve a 15:1 AFR. A positive LTFT, is indicating a lean running condition. When we see LTFT above 5%, we need to look at why we're running lean. Easy way to say/reads this is; needing more than 5% increase fuel to...
  2. 2001LC

    New OEM fan clutch but still roaring dump truck?

    Did you inspect and wash radiator fins, and with skid plate off. How was it? The ECT temp sensor has very little to do with fluid (fan) clutch. Other than, the ECU uses data from it as it does from other sensors, to determine fuel trims, etc. Which if running lean (LT FT above 5%), we run a bit...
  3. 2001LC

    New OEM fan clutch but still roaring dump truck?

    Going into 200F ECT is high. But then I DO NOT drive in OAT of 107F. Make sure your radiator fins and clean. If your fan clutch never disengages, it must be defective. I'd test like this. Start cold engine, fan clutch should be engaged. After about 2 minutes it should disengage, If not it bad.
  4. 2001LC

    New OEM fan clutch but still roaring dump truck?

    Fluid Clutch engages, when coil on face gets hot. Heat is transferred from radiator to coil. What is ECT (engine coolant temperature.)? Never mind. I asked this before and for other data point. You never responded. Good luck!
  5. 2001LC

    New OEM fan clutch but still roaring dump truck?

    I see you monitor ECT on your phone app. But I did not see what ECT is and at what OATs and condition. i.e sunny, hot morning or 3PM sun cook and egg on the black top, RPMs, MPH, AC on, fuel trims, etc.? I run logs both with Blue driver and I just got a OBDIImx+. Fuel trims, ECT and with OBDII...
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