Problems with V6

03mustangv6wh

Member
Apr 5, 2019
8
1
13
19
Virginia Beach
Hey everyone, I’m trying to figure out what makes my 2003 Ford Mustang V6 have a rough idle only when warm. It’s when I either let it idle for a bit or when it is warm and I run into a store or something and come back out and it acts like it wants to die. It’s only when it’s warm not cold. Cold is fine. I just replaced the spark plugs and wires. PVC.
Also I’m hearing a weird grumble from the back everyone once in a while.
Last thing my suspension makes some noise in the front, wondering what good stuff I can replace it with.
2003 Ford Mustang V6 white with 73k miles
 
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03mustangv6wh

Member
Apr 5, 2019
8
1
13
19
Virginia Beach
Suggest starting out by cleaning the MAF sensor.

Did you install all spark plug wires following the original factory routing and using all factory looms and ties downs?

Next double check that the cooling water jacket doesn't have any air trapped inside the motor.

V6 coolant refilling procedure
https://www.allfordmustangs.com/forums/v6-tech/299481-1998-mustang-irregular-rpms-showing-hot.html#2604913
Yes to looks and tie downs. Forgot to mention it’s got a whole new cooling system also. I’ll look into the cooling water jacket though, thank you
 

wmburns

SN Certified Technician
Aug 14, 2009
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