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ROUGH running when cold S90-V90 1998

uid 19's pic
posted by  jbowers on  Thu Jan 20 07:19 CST 2005
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last visit: Sun Jan 22 13:49 CST 2012
[RELATED]

Do you mean the engine stumbles and you have drivability issues or just that you have noises? If just noises, look for something in the exhaust. Is a manifold coming loose or one of the pipe clamps or a hanger?

If it is drivability, I would think first of a thermostat failing open and keeping the engine from warming up. (Does the gauge come up to mid-scale?) Lastly the temperature sensor tells the ECU what the engine's temperature is and if it is lying the engine worn't run good. The Motronic 4.4 ECU system only has one temperature sensor, on the engine at the thermostat housing.
--
'96 965, 16' wheels, rear 18mm bar & Koni + 204HP cams at 122K. Had '85 745 Turbo Diesel for 200K.






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