Engine Knock Noise

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Jul 31, 2012 | 05:43 PM

rg8043

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Engine Knock Noise

I own a 1997 5.4L expedition. I have experienced something which I think is a bit strange and since I am not that mechanically inclined I thought I would ask for some advice.

When I tow my boat, ( I live in Las Vegas, temps average 95-105) I can hear a knock or rattling sound coming from the drivers side of the engine. As soon as I unhook the trailer and drive without the boat, the sound goes away.

Any ideas as to why this only happens when I tow?

Thank You

Rob G.

Jul 31, 2012 | 07:57 PM

madsonp

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From: Billings, Montana

What the octane of the gas you're buying ?

Jul 31, 2012 | 08:20 PM

Spaded_Z

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And how hot is the outside air temp?

Does it sound like gravel in the engine? I had that with my Slow-bra when the outside temp would get over 90.

Aug 1, 2012 | 01:10 PM

rg8043

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regular 87

Aug 1, 2012 | 01:11 PM

rg8043

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it sounded like more of a rattling sound, the temp was around 100 degrees

Aug 1, 2012 | 01:26 PM

Spaded_Z

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Only when you're on the throttle under load? When you're off or going easy, no rattling?

Aug 1, 2012 | 01:49 PM

rg8043

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actually I only noticed the noise when I got out of the car and it was idling; I rolled down the windows and tried to hear it when I was driving but I did not hear the noise, but I did feel a little loss of power.