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1990 Mustang is vibrating, not sure what it means!

584 Views 5 Replies 4 Participants Last post by  30 sick
my 1990 gt, i couldnt get it running without the vibrating, like i said in other threads i changed everyting i can think of, still no luck so i decided to take the intake off, and the back 2 ports on lower intake have oil on and in them anyone know what it means or if it has something to do with the vibrating.
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Harmonic balancer?
well i looked at that looks pretty good to my eye
My mustang was doing the same thing last month and it was because the harmonic balancers rubber seal cracked and it caused the balancer to flop around. did you check it while the car was running?
If you have oil in the ports, your plugs might be fouled. A dead cylinder will cause shaking so you might have 2 dead cylinders.

Oil in the ports could mean worn rings, a bad valve, or excessive crankcase pressure.
oil in the ports is blow by, the vibration could be dead cylinders, take those 2 plugs out and do a compression test and compare the two results then do a compression check on a known good cylinder and compare all 3. Check harmonic balancer, they are very common to come apart.
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