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Our Surf (1993 3.0, 99,000 miles) has developed a rather worrying vibration under certain circumstances. It's by far the worst at about 60mph, when the accelerator is pressed just enough to get the needle to about 2000RPM but not put any force through the gearbox. At that condition, it shakes the whole car pretty badly - accelerate more heavily, or lift your foot off, and it settles right down again.
At that 2000RPM, if I slip it into neutral without changing accelerator position, the engine speed doesn't change; the gearbox is engaged, but no torque is being transmitted through the torque converter. As soon as it goes into neutral, even with the engine speed still up, the vibrations die down.
I've checked the ATF (it was low, but have topped it up and it's still happening). My friend's suggested, and it sounds logical, that the engine mounts might need replacing. I've fitted a snorkel recently too, and wondered if the air intake might be involved, but at that speed/power there should be no issues getting air in, and it works at much higher power without an issue.
What do people think? Has anyone else seen similar symptoms?
At that 2000RPM, if I slip it into neutral without changing accelerator position, the engine speed doesn't change; the gearbox is engaged, but no torque is being transmitted through the torque converter. As soon as it goes into neutral, even with the engine speed still up, the vibrations die down.
I've checked the ATF (it was low, but have topped it up and it's still happening). My friend's suggested, and it sounds logical, that the engine mounts might need replacing. I've fitted a snorkel recently too, and wondered if the air intake might be involved, but at that speed/power there should be no issues getting air in, and it works at much higher power without an issue.
What do people think? Has anyone else seen similar symptoms?
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