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Strange Vibes man... (around 5k RPM)

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Old 11-21-08, 08:10 AM
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TX Strange Vibes man... (around 5k RPM)

OK, so, got my project 7 (86 N/A sport model) from my dad's driveway. (Had been parked there for about a month waiting on my new garage.) Fire it up (always fires up on the first try, love that) and warm it up. Started the 15 mile trek from his house to my garage... When I got onto the highway I began to notice some vibrations after 4k RPM. (also above 45mph). This is a new symptom for this car, had not done this before. Almost felt "harmonic" had a pattern to the vibration, so I wonder if anyone has an idea on this...

Lemme know
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Old 11-21-08, 08:56 AM
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Originally Posted by DallasFC1
OK, so, got my project 7 (86 N/A sport model) from my dad's driveway. (Had been parked there for about a month waiting on my new garage.) Fire it up (always fires up on the first try, love that) and warm it up. Started the 15 mile trek from his house to my garage... When I got onto the highway I began to notice some vibrations after 4k RPM. (also above 45mph). This is a new symptom for this car, had not done this before. Almost felt "harmonic" had a pattern to the vibration, so I wonder if anyone has an idea on this...

Lemme know
DallasFC1
Maybe flat spots on the tires after parking it for a month? Try driving it on the highway for 50 or so miles. The tires will get completely warm and if there are any flat spots, they will work out.

Just my best guess.
Good Luck!
Old 11-21-08, 10:32 AM
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i know that when the oil is getting low in my engine the engine makes a "harmonic" vibrating sound. So then i simply top off the oil and its gone for a while
Old 11-21-08, 10:39 AM
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Engine, Not Motor

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Originally Posted by jfpimp91elkland
i know that when the oil is getting low in my engine the engine makes a "harmonic" vibrating sound. So then i simply top off the oil and its gone for a while
WHAT?!

You are SERIOUSLY damaging your engine if this is the case. If your oil level is so low that it effects how the engine is operating, it is well below the safe point.

To the original poster, you need to isolate whether the vibration is caused by the engine or drivetrain. With the car stationary, hold the engine at 5K RPM. Does it vibrate?
Old 11-21-08, 11:14 AM
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it vibrates when the oil is only like 1/4th down from full. in other words 3/4ths full.
Old 11-21-08, 12:10 PM
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dipsticks only read one quart

Check what aaron said and if it is the tires then try to do a big burnout, may not help if it's the front though
Old 11-21-08, 02:05 PM
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yea i know the dipsticks read 1 quart. It vibrates between 1/4th of a quart low and any thing less. What could cause this type of vibrating?
Old 11-21-08, 08:00 PM
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the wheels coul also be seriiously out of balance. does the steering wheel shimmy bak and forth? maybe a wheel bearing is going bad, or your wheel is riding on the tread weird due to an alignment issue... does your car pull straight when you let go of the wheel?
Old 11-21-08, 08:05 PM
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yea all my stuff is fine. car pulls straight.
Old 11-21-08, 08:26 PM
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did it vibrate while parked, like aaron suggested?
Old 11-22-08, 09:47 AM
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yea mine does
Old 11-22-08, 10:52 AM
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Engine, Not Motor

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If it vibrates when parked and the oil is low, the engine is being starved. I doubt this is the problem with the original poster.
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