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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Volvo 960 II -97 vibrates in very slow speedViews : 1102 Replies : 6Users Viewing This Thread : |
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Oct 21st, 2019, 21:31 | #1 |
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Volvo 960 II -97 vibrates in very slow speed
Hi. My Volvo 960 II -97 2.5 Automatic vibrates when I accelerate from 0 to 40 km/h. It may calm down if I drive neatly but sometimes whole car vibrates. Also if I'm on lights and idling, I can feel the steering wheel vibrating mildly like the engine was running roughly. Any ideas?
The drive shaft support bearing has been changed and this may be worse after that. Does badly assembled drive shaft support bearing feel in the driving wheel when driving? |
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Oct 21st, 2019, 21:46 | #2 |
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if you had to split the driveshaft to replace the mount, did you mark both halves before separating....could be out of balance if its gone back together a few splines out.
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Oct 22nd, 2019, 08:34 | #3 | |
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Quote:
Take the car for a short drive, accelerating gently to the speed it vibrated worse at or just over and return home. Crawl under again (without jacking the car up) and tighten the 4 bolts evenly, a little at a time. Once completely tight, take the car for a test drive to confirm it's now vibration free. If not, repeat the process. Usually only takes one try though. As for your other problem, it sounds as if the IACV is blocked or not working - the fuel ECU is meant to bring the idle speed up to cover extra electrical load such as lights, heater/A-C fans etc when idling. Also when was your ATF last changed? Old/dirty ATF can cause a lumpy idle, almost as if there's a heavy misfire. I'm guessing you've already checked the basics such as plugs, distributor cap/rotor arm or coil packs if it has the instead.
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Oct 22nd, 2019, 21:49 | #4 |
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First thing I would look at is the engine and gearbox mounts
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Oct 25th, 2019, 14:12 | #5 |
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In somebody else's car (not a Volvo) vibration at low speeds, including steering wheel shake, turned out to be due to a faulty/damaged tyre.
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Oct 25th, 2019, 14:24 | #6 |
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The big clue here Martin is he recently replaced the propshaft centre bearing. Knowing they don't always fiond the exact "vibration free" position at first, that's the most likely cause, especially as it's only been present since he did the job.
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Aug 26th, 2023, 23:12 | #7 |
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Just reading this thread. Curious if you ever found the culprit
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