C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

vibration on cold startup only

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Old Jan 22, 2003 | 08:04 PM
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Default vibration on cold startup only

I have a really weird vibration when I start the car. Sounds so much like the fuel rails vibrating but when I installed the FX3 option I checked them when the rocker panel were off and they are tight as they get. Can't really hear it outside the car but is very present on the inside. Can't seem to isolate it from front to back. Definetely from the shifter to the rear it can be heard. Once the car has run for like a minute it goes away never to be heard from again until and overnight cold sitting. Any ideas?
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Old Jan 22, 2003 | 08:17 PM
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Default Re: vibration on cold startup only (kittmaster)

Mine 'vert did something sort of similar. The passenger side muffler hangar was the culprit. Still comes and goes. Rubber is getting stiff or something I guess, on mine anyhow...
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Old Jan 23, 2003 | 07:41 AM
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Default Re: vibration on cold startup only (Lone Ranger)

I look into that.......any other ideas from anyone???
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Old Jan 23, 2003 | 11:12 AM
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Default Re: vibration on cold startup only (kittmaster)

Engine Mounts?
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Old Jan 23, 2003 | 01:05 PM
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Default Re: vibration on cold startup only (Aaron's 87)

its definetely coming from the rear to rear passenger side of the car. I would rule out engine mounts.......car would shake nastily other wise if they were broke or loose........ :confused:
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Old Jan 23, 2003 | 01:25 PM
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Default Re: vibration on cold startup only (kittmaster)

FWIW, I've also read somewhere that vibration of a similar origin can be a symptom of the in-tank electric fuel pump going south.
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Old Jan 26, 2003 | 07:14 PM
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Default Re: vibration on cold startup only (Lone Ranger)

but why only when its cold...........doesn't do it in the summer time...... :confused:
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