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Oct 3, 2009 | 03:12 PM

sardis51

Thread Starter

Junior Member

Joined: Sep 2009

Posts: 4

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Help! Help!

I have a 97 f150 4.6 and it is making a rattling noise as I pick up speed or put the truck under a load. Does anyone know what this could be?

Oct 4, 2009 | 09:16 PM

DaleD

Senior Member

Joined: Jul 2007

Posts: 134

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From: White Lake, MI.

Could that be spark knock, my 97 does that in warmer weather.
I use regular gas and when about half full i use mid-grade to fill
it back up again and the noise usually goes away.

Oct 6, 2009 | 08:59 AM

metrius

Junior Member

Joined: Sep 2009

Posts: 21

Likes: 0

Maybe your catalytic converters. When they fail, the honeycomb structure inside often breaks up. The faster the engine runs, the more exhaust gas is going through the cats, rattling the broken pieces around.

Oct 6, 2009 | 09:01 AM

jhelrey

5 Year Member

Joined: Apr 2009

Posts: 2,939

Likes: 218

From: MN

If what Met is saying is the case, just go under your truck when it is cold and punch your cat converter. If it rattles like a can of nails, you need a new one.

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