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Old 03-01-2012, 09:05 PM   #1  
2010stanger
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Default engine knocking?

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.
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Old 03-01-2012, 09:38 PM   #2  
SchneidyP4.6
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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.
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Old 03-02-2012, 06:22 AM   #3  
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Do you have a tune? And what grade fuel are you using
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Old 03-02-2012, 07:10 AM   #4  
flash gordon
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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.
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Old 03-02-2012, 11:17 AM   #5  
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Quote:
Originally Posted by 2010stanger View Post
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.
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
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Old 03-02-2012, 12:10 PM   #6  
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It can also be caused by the exhaust pipe hangers.
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Old 03-02-2012, 12:49 PM   #7  
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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.

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