Question about Ipcw Ford F150 / F250 Ld 1999 2000 2001 2002 2003 Fog Lights Projector W/ Halo Clear-1 Pair

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2000 f150 engine misfires once it warms up and is under load conditions

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Check spark plugs have the right gap. heated plugs that are worn will give you a misfire, also if not been changed in a few years would replace them.

Posted on Apr 04, 2014

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2000 Nissan Sentra 1.8L. High mileage (330,000 plus miles). May take 5min or longer to start cold- acts like it's not firing one or more cylinders. Once it starts there's a big cloud like it was flooded....


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The most common causes of a skip or misfire is a bad plug wire[s] or spark plug[s]. Here's what I look for whenever I do an initial test drive to verify a misfire, stumble, or skip complaint. Once the motor is warmed up I get up to about 48 mph. At that speed the transmission is in 4th gear and the torque converter clutch is locked up giving the engine a solid connection to the drivetrain so any little skip can be felt [you usually can't feel a misfire unless the Torque Converter is locked up due to the fluid drive dampening the sudden but brief change in crankshaft speed during the misfire] Once I'm at 48mph I ease into the throttle just as much as I can without the transmission downshifting. This combination gives you the leanest fuel condition, the highest spark load on the ignition system, and a solid engine to drivetrain connection which makes catching a misfire quite easy. With a little practice at this they'll stick out like a sore thumb. I RARELY have to replace a coil on a 3.3L but often have to replace plug wires and plugs. Look for black soot like coating in the far end of the plug wire boots, rusty or corroded coil towers [where the plug wires attach to the coils] or worn spark plugs. 9 out of 10 times that's where I find the problem. If you're handy with an ohm meter you can test the plug wires and should find about 1,000 ohms per inch of wire. The reason most misfires aren't felt on a cold engine is due to how rich the fuel system has to be to keep a cold engine going and its far easier to fire a cool/rich fuel mixture than a hot/lean mixture. You usually can't feel them during fast/hard acceleration for the same reason and the torque converter clutch is usually disengaged during both of these types of operation.

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