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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 2004-2008 Ford F150



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  #1  
Old October 13th, 2010, 11:31 AM
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Default Intermittent Grinding Noise

Hey All - truck's going in for my first service issue since I purchased it in dec of 2008 (2008 f150 fx4 extended cab).

Symptoms:
Driving around 30-40 mph, a grinding noise suddenly starts. It sounds like there might be something caught in the drivetrain, a squirell in the wheel well, but the best description is ice in a blender. It's really loud too. There's no way I can distinguish if the sound is coming from the front end / rear end - although it sounded like rear end to me.

Shifting into neutral doesn't change the speed / tone of the grinding noise

Hitting the brakes doesn't change the speed / tone of the grinding noise

Once I slow down to around 5 mph (or stop) - there's a clunk sound and the noise goes away.

Issue:
Based on my internet research - it appears to be an issue either with the IWE solenoid or vacuum lines controlling the 4wd. IWE solenoid has a tsb - but the vacuum lines could have been melted by my new exhaust (in which case - I'm SOL for warranty work).

TSB: TSB 06-8-15
Some 2004-2006 F-150 and 2006 Mark LT 4X4 vehicles built before 4/24/2006 may exhibit a noise in 2 wheel drive from the front Integrated Wheel Ends (IWE) and/or the 4X4 system being inoperative. The IWE solenoid may have ingested water and passed it to the IWE system causing water contamination in the vacuum portion of the system. A shorted IWE solenoid can set the codes C1979 and C1980. If either code is present, the 4WDH light will be inoperative.

Testing:
Supposedly - if you hear this grinding noise and push the switch for 4wd - the sound immediately quits. Haven't tested it yet as I'm out of town. I doubt the dealer will be able to reproduce the issue - as it occurs very infrequently - although I did get rattled when it occurred twice on Monday.
  #2  
Old October 14th, 2010, 09:18 AM
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sounds like your right on top of it Ted
IWE was my thought
sometimes this is caused by a cracked or loose vacuum; get under there and look around could save you a trip to the dealer
sometimes the sound is more pronounced when turning is also an indicator
good luck and keep us posted on the outcome



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  #3  
Old October 14th, 2010, 05:09 PM
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Just got home and had a chance to further test the theories and all.

Bad news - the IWE already has the shield installed over top of it.

Good news - The grinding occured three times on the way home from the airport - once on 60, once on 65 and once on 19 (near my house). to reproduce - the truck must be running for about 5-10 minutes - come to a complete stop - drive straight (no turns) at 40-45 mph - the noise occurs. To stop the noise - switch to 4wd mode.

So either my IWE is going bad after 15k miles or I do indeed have a vacuum leak somewhere.
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Old October 15th, 2010, 10:41 PM
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Back from the dealer - issue appears to be resolved. They said the vacuum lines had worked loose due to normal driving - nothing I did.

What's better - they cleaned the truck up real nice for me. Couldn't believe they did that.

I'm wondering if they may have cleared my p1000 code as well - allthough I haven't plugged the CS in yet (and haven't come close to driving it 50 miles at or over 55 mph). If the code has cleared - I'd be surprised.
  #5  
Old October 18th, 2010, 01:28 PM
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Quote:
Originally Posted by TedC View Post
Back from the dealer - issue appears to be resolved. They said the vacuum lines had worked loose due to normal driving - nothing I did.

What's better - they cleaned the truck up real nice for me. Couldn't believe they did that.

I'm wondering if they may have cleared my p1000 code as well - allthough I haven't plugged the CS in yet (and haven't come close to driving it 50 miles at or over 55 mph). If the code has cleared - I'd be surprised.
Thanks for the up-date



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