[jpoirier]

Hi guys

This is a first for me .Hope someone can help.
2007 f150 5.4 liter noisy when cold.the colder it is (say -25 deg c) the noiser it is.
When I start it and put it in gear the rpms drop to 8 or 900 and the engine
vibrates and sounds sort of like a diesel.If I increase the rpm it quiets down a bit.It seems the worst at 900 rpm.The whole truck resonates ,it's pretty scary.
When it warms up it"s a lot quieter,sort of a low pitch hum at idle speed.
My dealer has looked at it a few times but can't seem to find the problem.
No code shows up .They contacted Ford and were told to check oil pressure
when cold.
The problem started last fall and the colder it got , the noisier it got.
If anyone has come across this one ,please let me know !!!

Thanks

 

[Mr Mac]

The first thing that comes to my mind is what viscosity oil are you running? In extreme cold weather a 5W oil is almost always recommended. That and ensuring the oil pressure is right would be the first things to check. If it is oil related then driving it like this is not conducive to long engine life.

 

[jpoirier]

I'm using the recommended oil 5w30.The warranty expires in july2012.Only 40k km on the truck. Hoping to get it fixed before then,but it don't look good.Was hoping that someone had seen this problem.Help!!!! thanks

 

[Mr Mac]

It just dawned on me, I said 5W oil and didn't finish that, 5W-20 for extreme cold weather is best over 5W-30.

Question: Will Using a 0W-20 Oil Help Reduce Valve Noise During the Winter?I have been using Mobil 1 5W-20 in a 2000 Honda Civic. However, when the weather gets cold here in Wisconsin, the car exhibits quite a bit of valve noise for about 1-2 minutes after starting. I would like to try 0W-20 in the winter months. Will it help with the valve noise? Will it hurt the engine?-- Ben Fairweather, Appleton, WI

Answer: Using Mobil 1 0W-20 Advanced Fuel Economy for your engine will help to get better cold-start flow. 0W-20 will provide better low temperature performance and should help to reduce valve train noise while still providing the “warmed-up” protection of the 5W-20 oil. If this does not help you, your problem may not be flow but oil film thickness, in which case you may have to try a heavier 0W oil like 0W-30 or 0W-40.

 

[edwardison]

I'm in Minnesota. Also 2007 F-150. Just the opposite problem. Starts up great, then after complete warm up the oil pressure drops and idle gets rough and noisy. 115K. Also running 5W-20 std. I would be afraid to run thinner.