Fox T-Bird/Cougar Forums

Technical => Engine Tech => Topic started by: cougarpower51 on January 14, 2005, 11:46:27 PM

Title: 3.8 vibration
Post by: cougarpower51 on January 14, 2005, 11:46:27 PM
Hey guys everytime im in a stop light with the brake pedal on the floor the car starts to hesitate but when I start moving is ok what can it be, I changed spark plugs, cables etc :america:  :repost:  :sawzall:
Title: Re: 3.8 vibration
Post by: 1986Tbird on January 14, 2005, 11:55:29 PM
Maybe the torque converter is staying locked?
Title: Re: 3.8 vibration
Post by: cougarpower51 on January 15, 2005, 12:06:16 AM
Is not the torque converter because my tranny and converter are 8 months old and this vibration has been there before i changed the tranny
Title: Re: 3.8 vibration
Post by: Tbird232ci on January 15, 2005, 01:12:09 AM
its the engine struggling to make power
Title: Re: 3.8 vibration
Post by: cougarpower51 on January 15, 2005, 11:31:14 AM
no the engine works ok when im moving it only exhitates when im in a stop light with the brake pedal , if i have the brake pedal on and hit the gas pedal a little it stops
 :america:  :sawzall:
Title: Re: 3.8 vibration
Post by: softtouch on January 15, 2005, 02:54:27 PM
Does it stop vibrating if you just take your foot off the brake?
It could be a vacuum leak in the power brake booster.
Title: Re: 3.8 vibration
Post by: cougarpower51 on January 15, 2005, 06:10:43 PM
when i took the brake pedal off is not so bad but have to press the gas pedal a little so it stops the vibration
Title: Re: 3.8 vibration
Post by: V8Demon on January 16, 2005, 01:48:40 AM
What year is the car?.  Idle RPM too low, TPS, IAC.....
Title: Re: 3.8 vibration
Post by: lowcat on January 16, 2005, 10:42:14 AM
Mine does the same thing. And when in gear and holding the brake it idles about 500 rpms. If I bump it up to 900-1000 rpms it stops and doesn't shake anymore.