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Friend's 1991 NA 740 having issues 700 1991

posted by  someone claiming to be Juan P. on  Thu Mar 23 10:41 CST 2017 [RELATED]

All,


I'm currently trying to help a friend of mine with his 1991 NA 740. It is currently experiencing what he describes as a "bucking" issue.

The car in question is a '91 740 with M47 5-speed gearbox, 140k miles. He has owned this car since it was new.

The issue has been recurring for a year. What happens is this - when fully warmed up, as soon as you release the clutch to start in 1st gear, the car slightly shakes and sputters before the clutch engages. It happens when starting from stop signs or stoplights.

There was another issue that caused some problems last summer as well. On a cold start, the engine would hunt at idle - meaning, the tach would fluctuate between 800 and 1400 rpm, as if it was constantly revving. We diagnosed a dirty idle air control motor. We also cleaned out the throttle body as well.

Another thing accompanies the bucking issue. Normally, a healthy B230F will idle at around 850-900 rpm in Park or Neutral, depending on gearbox. My friend's car, when warmed up, idles at around 550-650 rpm. The "bucking," as I mentioned, takes place when starting out.

Welcome your thoughts and suggestions.








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    Friend's 1991 NA 740 having issues 700 1991

    posted by  TONY H on  Thu Mar 23 14:25 CST 2017
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    last visit: Fri Oct 17 16:39 CST 2014
    [RELATED]

    The earlier Idling issue was solved. It sounds like.

    Hard to tell from description whether the bucking is lose of power at the engine or a drive train issue. I think the 700's have this as well, I would look at the Rubber Mounting between the back of the trani and the driveshaft. If it's torn at the mountings, you may get a bouncing/ slapping/bucking as you first start off. Also the rear Universal joint might be frozen and on startup it might give you the same feel.
    --
    '75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.lyse.net/brox/TonyPage4.html http://cleanflametrap.com/tony/







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