2010stanger

hay guys when car is running at normal temp im hearing knocking with a rattle in 2nd,3 and 4th at about 2000 rpm under load. at idle sounds normal, cold or hot. Reving engine everything sounds ok.

SchneidyP4.6

Could be a heat shield on the exhaust... Prop your hood and have somebody give small revs/hold rpm's where the rattle occurs to find the culprit.

fordplay

Do you have a tune? And what grade fuel are you using

flash gordon

Knocking occurs at low speed acceleration. This is premature detonation in the engine. Persistent knocking can damage the engine. Most of the time caused by low grade fuel.

FordService

Hello 2010stanger,

Contact Ford of Canada Customer Service Center at 1.800.565.3673. The rep will document and assist you with that concern.

Noemi

ski

It can also be caused by the exhaust pipe hangers.

bigblue95z

From the description, it sounds like the same thing that I had since like 1300 miles. (20,000 now) Reapeated trips to the dealer later, they claim they don't hear it. It's a light knock noise, between 2-3k RPM, only under load (like light acceleration), but def not detonation. I think it's something to do with the variable cam timing but dealer kept blowing me off. Did it bone stock, with a tune, trying many filling stations. I suppose I shouldn't be worried about it, but it still bugs the crap outta me every time I drive it.