1986 Pontiac Fiero Huge vibration noise

Tiny
VON42
  • MEMBER
  • 1986 PONTIAC FIERO
  • 6 CYL
  • 2WD
  • MANUAL
  • 10,000 MILES
I'm having a big vibration trouble when I press the gaz around 2500-2600 rpm and 3800-4000 the vibrations are loud from the interior but I don't know if people outside can hear it. And on the idle the entire carcshake, as if I have a hug v8 motor but it's a v6 ( 3.1reforged ), someone told me it could be a exhaust vibration but it is really loud so I don't think it can only be an exhaust vibration. And looks liek it's affecting my performance I have around 185 hp ( new cam and headers ) but when I press the gaz it's like if I had only 130-135. Thanks for helping me
Monday, December 8th, 2008 AT 9:34 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Check the cradle bolts and rubber bushings, they may be loose/broke.

Check the spring hangers on the exhaust.

Inspect the rear control arms, bushings, ball joints, bearings.
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Tuesday, December 9th, 2008 AT 9:44 AM

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