Sluggish power, fluctuation under load
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2nd Gear
Joined: Feb 2022
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Sluggish power, fluctuation under load
Hey y’all, I have a 2000 F150 with a 5.4L. It has recently started exhibiting sluggish takeoff and seemingly reduced HP under load (constant lug uphill). The reduced HP feeling under a load is accompanied with a surge of sorts similar to a A/C compressor draw but more random with no rhythm. Keep in mind, AC is off. Something I noticed tonight, which initiated this post, is that when the truck is cold, it runs like a top! As soon it warms up just slightly (just a few miles of driving) it turns into a turd. What could be causing the difference in performance from cold open loop to warm closed loop?
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2nd Gear
Joined: Feb 2022
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I did. The check engine light is off however I still checked in case the bulb was burned out. No codes. Engine runs smoothly, just lame.
More Turbo
Joined: Sep 2017
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Cargo Master
Joined: Dec 2015
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You want to get into OnBoard Monitoring or Mode 6 and look for misfire counts. Also check Pending codes
That said I'm not sure misfires would be your only issue. Would be nice to see some live data as it sounds like an open/closed loop issue maybe. I'd be curious about ECT, STFT, HEGO, TPS and maybe fuel pressure just for giggles
That said I'm not sure misfires would be your only issue. Would be nice to see some live data as it sounds like an open/closed loop issue maybe. I'd be curious about ECT, STFT, HEGO, TPS and maybe fuel pressure just for giggles
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Fershigadig
1997 - 2006 Expedition & Navigator
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Aug 14, 2006 09:34 PM
