Heavy engine vibration
So I have a 91 vert, 100k on odometer and i believe stock motor. When I got it I felt an abnormal vibration at about 6k but assumed engine mounts. Replaced engine/trans/differential mounts with delrin and now I know the vibration is not normal. I know there is going to be vibration with solid mounts, I put solid aluminum mounts in it and it was just a constant high frequency vibration and not a shake like I feel now. So It happens at around 3800-4200 and again from 5500-8k, at 3k and 4500 it is smooth. this is a shake the car like crazy vibration, cant see the mirrors clearly. I have pulled the fan clutch off and taken off a/c and p/s belts with no difference. Thinking it is something with internal balance and need some help. what should I check and is there any other known issues other that engine mounts for this.
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Forgot to mention this is at a stop with clutch dissengaged
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Not sure how to verify this offhand, but seems like the pressure plate would be suspect. Do the RPM ranges change when the clutch is engaged in first gear?
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No its the same in all gears or in neutral. did a clutch in the car as soon as I got it and did not notice any difference, this was before replacing mounts so I wasnt as worried assuming it just needed mounts. Pressure plate turns at engine rpm anyway so gear wouldnt matter.
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Originally Posted by Mint87RX7
(Post 11107133)
... Pressure plate turns at engine rpm anyway so gear wouldnt matter.
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Sorry wasnt dismissing you i think im just tired and not catching on, what are you getting at with the pressure plate?
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Originally Posted by Mint87RX7
(Post 11107116)
So It happens at around 3800-4200 and again from 5500-8k, at 3k and 4500 it is smooth.
I wonder if you might have an injector/fuel delivery issue. |
I'm with Clocker. One of your secondaries might be opening up too slow maybe?? I know that an injector not kicking on would feel like a blown engine. The 5k+ vibration may be related to the vdi but that's just a wild guess and have no clue.
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ive been thinking about that also, if i do a very slow roll up to 3800 i can feel the secondaries, almost like adding throttle. I may just unplug them and look for a change
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where are the letter stamps on rotors? different letters are for weight right? would i beable to see it with a borscope through the spark plug holes?
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stamps are on the sides of the rotors not the faces. youd have to tear it down to verify their weights
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