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post #1 of 2 (permalink) Old 07-03-10, 07:11 PM Thread Starter
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Thumbs up 5.0 Vibration

I am having trouble locating a vibration. It happens when I start the engine in neutral (c-4) ,at idle, as I rev the engine up, when driving the Ranchero down the road, gets worse at around 2,800rpm, gets smother at about 3,000 rpm. I have changed the flex plate to an SFI approved 50oz model, changed the harmonic balancer with a similar stock model, checked the spark plugs, wires and injectors for electrical problems. Still the vibration is there. I have run out of answers and hope some of you would have an idea...

Thanks.
1965 Falcon Ranchero, 1990 5.0 HO EFI, C-4.

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post #2 of 2 (permalink) Old 07-10-10, 12:49 AM
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Re: 5.0 Vibration

Quote:
Originally Posted by pichound View Post
I am having trouble locating a vibration. It happens when I start the engine in neutral (c-4) ,at idle, as I rev the engine up, when driving the Ranchero down the road, gets worse at around 2,800rpm, gets smother at about 3,000 rpm. I have changed the flex plate to an SFI approved 50oz model, changed the harmonic balancer with a similar stock model, checked the spark plugs, wires and injectors for electrical problems. Still the vibration is there. I have run out of answers and hope some of you would have an idea...

Thanks.
1965 Falcon Ranchero, 1990 5.0 HO EFI, C-4.
This is only a guess but it could be the torque converter itself could be bad talk to someone at a trans shop they could tell you for sure.
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