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

Vibration

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Old Oct 3, 2018 | 05:56 PM
  #1  
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From: LeClaire Iowa
Default Vibration

I have a 96 base coupe. Runs great. New opti,plugs and wires, 35k miles. I have one thing that bothers me. When I come to a stop light and am stopped holding the brake down I have a minor vibration in the steering wheel from the engine. If I lift my foot off the brake the vibration goes away completely even if the car does not move (slight incline). The engine is smooth as silk then. The RPM on the tach does not change that I can see. It must be vacuum related with the booster is the only thing I can think. Any thoughts? Thank You, Dan
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Old Oct 3, 2018 | 07:30 PM
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Originally Posted by Whaleman
It must be vacuum related with the booster is the only thing I can think. Any thoughts?
As I was reading, I thought the same thing. There are lines to inspect, check valves ang then the condition of the brake booster itself. If it were mine, I'd not worry about it. You will spend lots of time chasing this vibration. If it really bugs you, shift into neutral at stops.
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Old Oct 3, 2018 | 07:38 PM
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Originally Posted by billschroeder5842
As I was reading, I thought the same thing. There are lines to inspect, check valves ang then the condition of the brake booster itself. If it were mine, I'd not worry about it. You will spend lots of time chasing this vibration. If it really bugs you, shift into neutral at stops.
It must be internal to the booster. Right? If it was the main line wouldn't it happen all the time?
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Old Oct 4, 2018 | 10:40 AM
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Originally Posted by Whaleman
It must be internal to the booster. Right? If it was the main line wouldn't it happen all the time?
Check for a vacuum leak at the booster when your foot is on the brake.
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Old Oct 4, 2018 | 11:18 AM
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Originally Posted by bjankuski
Check for a vacuum leak at the booster when your foot is on the brake.
Thank You! Do you have any advice on where to look? Should I be able to hear it?
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Old Oct 4, 2018 | 03:35 PM
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From: Glenbeulah Wi
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Originally Posted by Whaleman
Thank You! Do you have any advice on where to look? Should I be able to hear it?
You might be able to hear a hissing noise in the car if the booster vacuum diaphram is broke when you are holding the brake pedel down.
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