2011 F150 3.5 V6 Ecoboost Screech at cold start
08-05-2022, 12:32 AM
#1
Junior Member
Thread Starter
Join Date: Aug 2022
Location: Texas
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
2011 F150 3.5 V6 Ecoboost Screech at cold start
How's it going fellas? I'm having an issue that started a couple of weeks ago. During a cold start my truck screeches for about 2-3 seconds and stops. It only happens during a cold start. When the truck is warm it won't happen. In the morning when first starting it up it screeches. It sounds like its coming from the left side of the engine area but i cant pin it down. There are no codes. I can turn the truck right off and start it again and the screech is lower but still there. Once the truck has been on for like a minute or more it won't happen until the engine is completely cooled. I have searched around and can't find anything with the same noise. It is not a knocking sound like the timing chain issue. The truck has about 150k miles on it. I have had it since i bought it new from the dealership and never have had any problems with it. I have attached a video, hopefully it works. Had to convert it to mpeg. Thanks for the help.
Last edited by Semperfortis1980; 08-05-2022 at 01:24 AM.
08-05-2022, 10:48 AM
#2
Senior Member
Semperfortis1980...
Vehicle Information
.
As a newbie...
.
- If you're not going to provide the vehicle information in your post(s), onsider putting your complete vehicle information (year, model, cab, trim, engine, wheelbase, _x4 drive, mileage, maintenance, modifications, etc., etc.) in your signature to have it automagically included when you post. *Eliminates playing 20 questions when/if a post is made pertaining to your vehicle.
» Edit Signature ««« -click-
*Don't forget to [ save ] it.
. - There are year specific forums which better serve non-general F-150 issues/topics.
08-05-2022, 12:43 PM
#3
Junior Member
Thread Starter
Join Date: Aug 2022
Location: Texas
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Vehicle Information
.
As a newbie...
.
- If you're not going to provide the vehicle information in your post(s), onsider putting your complete vehicle information (year, model, cab, trim, engine, wheelbase, _x4 drive, mileage, maintenance, modifications, etc., etc.) in your signature to have it automagically included when you post. *Eliminates playing 20 questions when/if a post is made pertaining to your vehicle.
» Edit Signature ««« -click-
*Don't forget to [ save ] it.
. - There are year specific forums which better serve non-general F-150 issues/topics.
08-05-2022, 01:05 PM
#4
Senior Member
Are you starting it with the AC on? If so, try it with AC off. It sounds like a tight pulley. Could be AC compressor, alternator, idler, tensioner. If the screech goes away with AC off then AC compressor pulley or the compressor itself (they lock up sometimes apparently) seems likely.
f it's not the AC then people have had luck removing the serpentine belt and spinning the pulleys by hand. They should all spin smoothly.
f it's not the AC then people have had luck removing the serpentine belt and spinning the pulleys by hand. They should all spin smoothly.
The following users liked this post:
Newbie 5 (08-05-2022)
08-05-2022, 06:29 PM
#6
Junior Member
Thread Starter
Join Date: Aug 2022
Location: Texas
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Are you starting it with the AC on? If so, try it with AC off. It sounds like a tight pulley. Could be AC compressor, alternator, idler, tensioner. If the screech goes away with AC off then AC compressor pulley or the compressor itself (they lock up sometimes apparently) seems likely.
f it's not the AC then people have had luck removing the serpentine belt and spinning the pulleys by hand. They should all spin smoothly.
f it's not the AC then people have had luck removing the serpentine belt and spinning the pulleys by hand. They should all spin smoothly.