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Vibration, sound at idle in gear S40-V40 2001

posted by  someone claiming to be Patrick on  Mon Feb 26 04:05 CST 2001 [RELATED]

My new (and I mean less than 2xxx miles new) S40 developed a low vibration literally overnight.

When in gear, at idle, with foot on the brake, there is a low pitch throaty noise (sounds like an exhaust at the end of its life) coupled with a vibration which can be felt through the steering wheel and brake pedal (feels like you would expect a car with a broken engine or transmission mount). Anyway, brought it to the dealer who had it for two days without being able to ID the problem. At the end of the first day, he claimed "s40s sometimes have a little vibration". However, this didn't develop over time and in fact the loaner s40 they gave me did not exhibit this problem, despite having three times as many miles.

Dealer says that they're going to have me bring it in for a factory rep to look at. Here are my questions:

1. Has anyone experienced this before?

2. Is it likely the factory engineer will be any better equiped to find the problem?

I'd appreciate any input!

Patrick







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    Re: Vibration, sound at idle in gear S40-V40 2001

    posted by  someone claiming to be Dave the Volvo Tech on  Tue Feb 27 15:42 CST 2001 [RELATED]

    Patrick-

    I have seen a couple X40s that developed a problem with the power brake vacuum pump system. This system supplies additional vacuum on a cold start (and on demand) so the power brake booster has enough vacuum to operate correctly. I drove a pre-release V40 without this feature and you couldn't stop the car first thing in the morning. I personally have changed the vacuum switch on one car for this type of complaint.

    Dave the Volvo Tech

    '99 V70R AWD, '93 854 GLT, '82 242 DL







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      Re: Vibration, sound at idle in gear S40-V40 2001

      posted by  someone claiming to be cmmon on  Tue Feb 27 17:32 CST 2001 [RELATED]

      Hi,

      I have 2001 v-40 with ~1300 miles. Just when the car passed ~1000 miles, a moderate vibration appeared when in driving and the brake pedal on (say, stop at a traffic light). There is no noise, but I can feel something like mechanical "bo-boom, bo-boom" in the engine. Seems no such a thing when the transmission is in neutral and the brake pedal on. I did not take it to the dealer yet, and going to do that next week.

      I would appreciate any comments/information.

      Thanks for your time.







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        Re: Vibration, sound at idle in gear S40-V40 2001

        posted by  someone claiming to be Dave the Volvo Tech on  Wed Feb 28 01:43 CST 2001 [RELATED]

        cmmon-

        Possibly the brake vacuum pump on this one, too. At idle in gear, these motors don't make much vacuum, so they added this system so the brakes work correctly. There is a bulletin describing the procedure to seal the pump- some of them are getting water inside and malfunctioning. It has a simple pressure switch that switches the pump on and off- if the 'window' in the switch is too small, the pump cycles rapidly, especially in gear with the brake on.

        Dave the Volvo Tech

        '99 V70R AWD, '93 854 GLT, '82 242 DL






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