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-   1997 - 2003 F-150 (https://www.f150online.com/forums/1997-2003-f-150-118/)
-   -   2001 f150 weird noise after turning key to ON (https://www.f150online.com/forums/1997-2003-f-150/519869-2001-f150-weird-noise-after-turning-key.html)

handyobo 12-10-2018 09:27 PM
Originally Posted by Roadie (Post 5244627)
I don't have a helper but I went out and opened the hood, turned the key on and after a couple of seconds I did hear a noise that came from the area you are talking about. It's not as loud as your noise and doesn't sound exactly the same but I do have a similar noise. I never noticed it before and it isn't audible from inside the cab.
Thank you for your feedback. So obviously the abs motor gets tested or activated when power is on. Mine sounds louder can only mean bearing or brushes problem inside the motor. It is not weird now for the mileage 389K kms. But at least good to know that noise is not from other mechanic issue. Bottom line just unplug the abs relay or fuse to disable it temporarily when in sudden failure.

Roadie 12-10-2018 09:46 PM
Originally Posted by handyobo (Post 5244634)
Thank you for your feedback. So obviously the abs motor gets tested or activated when power is on. Mine sounds louder can only mean bearing or brushes problem inside the motor. It is not weird now for the mileage 389K kms. But at least good to know that noise is not from other mechanic issue. Bottom line just unplug the abs relay or fuse to disable it temporarily when in sudden failure.
Just for info, my truck has 152,000 miles on it.

handyobo 12-10-2018 10:04 PM
Originally Posted by Roadie (Post 5244635)
Just for info, my truck has 152,000 miles on it.
maybe I was wrong. it may not be the abs motor, it could be the abs solenoid which controls valves. the noise and vibration only last for about 1 second, very hard to identify what caused that.

Uncutcrayon 12-22-2020 01:41 PM
Long shot
 
Originally Posted by handyobo (Post 5244636)
maybe I was wrong. it may not be the abs motor, it could be the abs solenoid which controls valves. the noise and vibration only last for about 1 second, very hard to identify what caused that.
You ever figure out that noise? I have the exact same noise. My truck acts like it’s not getting air or gas when I’m going at a constant speed of 45 mph. Wondering if that noise is connected.

glc 12-22-2020 04:24 PM
How does it act as if it's not getting air or gas? Is it kinda shuddering or hesitating? Is it at 45 mph with light pressure on the gas just maintaining speed in overdrive? That's a low grade misfire, spark plugs and/or coils. How many miles on them? Are they Motorcraft plugs? What year and engine?

Uncutcrayon 12-22-2020 04:29 PM
Originally Posted by glc (Post 5266718)
How does it act as if it's not getting air or gas? Is it kinda shuddering or hesitating? Is it at 45 mph with light pressure on the gas just maintaining speed in overdrive? That's a low grade misfire, spark plugs and/or coils. How many miles on them? Are they Motorcraft plugs? What year and engine?
it shudders. If I give it more gas it just Bogs down. I had plugs and packs replaced in Aug. 2001 F150 Lariat 5.4L 4x4.

glc 12-22-2020 08:33 PM
What brand plugs and coils? How many miles on your fuel filter? Any OBD2 codes?

projectSHO89 12-23-2020 08:37 AM
Originally Posted by Uncutcrayon (Post 5266716)
You ever figure out that noise? I have the exact same noise. My truck acts like it’s not getting air or gas when I’m going at a constant speed of 45 mph. Wondering if that noise is connected.
No, it isn't related.

The OP was noticing the ABS pump motor self test that is normal.

You are encountering something completely different, probably a misfire, fuel delivery issue, or similar. I'd put my money on a "mild misfire" condition.


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