clarsen

My truck has a ping under any load but not in park and being revved. Also when outside temp is around 75°or higher it lags power under load as well. Higher the temp more it lags. Please help

Jbrew

Which plugs are you using ? How many miles ? What year ? Which engine ?

MCpllabelle

Mine was doing that with E3 plugs installed.

clarsen

Motorcraft plugs about 12000 miles on them, 5.4l.

clarsen

I have the Motorcraft oem replacements

Jbrew

If you don't know the year, look inside the drivers door. Take a picture of the of the letters and numbers. I can help you out.

Also, take a pic of the odometer. Turn the key to run first (if it's digital.) Anyway that's where the miles should be. Might as well nip that one in the bud as well.

clarsen

It's a 2001 with 224k miles on it.

clarsen

I've replaced the plugs about 12k miles ago, cleaned maf sensor. Had a cop go bad replaced it. Replaced header gaskets few weeks back, also about two months ago had to replace intake due to blown out gasket at heater tube connector. The famous intake issue. New air filter, gotts mod. Computer has been reset after each item has been done. But problem still exists.

Jbrew

Yea that's a few miles. Yea, the plugs are most likley correct...that's important.

Could be , -

Bad plug gap

Bad Gas.

Carboned up..(Check Compression, = MotorVac Service).

Jumped time (can you hear any engine noise) ?

Check out the knock sensor any way you can..for looseness or perhaps nuts and bolts resting along side.

Number 2 and 3 most likley. Is there anything else going on, CEL or whatnot ?

Jbrew

Almost forgot, hows your converters ? That's worth looking into as well.