Cold engine - surging under light throttle?

[mdnt]

Ive seen this is 11-14s and in the f-150s, ive also seen this happen when people put in wrong oils in other vehicles with variable cam timing systems using similar VCT solenoids

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[carguy]

This is from the VCT, when engine oil is cold the vct solenoids arnt flowing the oil to the cam phasers as well as it should. Isnt harmfull to engine, just makes it slightly annoying to drive in cold weather till engine oil is warm. thats why when your engine oil temp goes up the surge goes away.

I believe it has to do with the charge motion plates during the warm up cycle. If it was VCT then all 11-14's would do this, which they don't.

Ive seen this is 11-14s and in the f-150s, ive also seen this happen when people put in wrong oils in other vehicles with variable cam timing systems using similar VCT solenoids

Great info guys. This is what I was hoping for...some solid reasons or ideas.

 

[wjlowe111]

Letting your car warm up and a tune may help this

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