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Engine rocking side-to-side ( '94 940, 117K miles) 900

posted by  spook on  Tue May 21 11:48 CST 2013
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear Fellow Brickboarders,

Hope you're well. All of a sudden, the engine - which runs smoothly - rocks side-to-side, rhythmically, such that it shakes the car. I cannot recall a post reporting this type of malfunction.

The following conditions obtain:
(a) RPMs are stable (change of Idle Air Control Valve made no difference);
(b) Rocking occurs when car is standing still & in neutral or in "drive"/moving;
(c) No codes show on the OBD readers;
(d) all drive belts/pulleys run true: no wobbles, etc.

I recently replaced distributor cap, rotor, and plug wires: car ran smoothly for six weeks. I also changed the oxygen sensor (preventive maintenance).

I disconnected the negative battery cable clamp from the battery, to re-set the ECU. The rocking persists.

Could this be a motor mount problem? They look fine from above.

I look forward to the benefit of your advice.

Yours faithfully,

Spook






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