Categorized | Ford Service Magazines

1996 Ford Aerostar Engine – Carbon Knock On Acceleration

Posted on 17 January 2014 by admin

Download ENGINE – 4.0L OHV – CARBON KNOCK ON ACCELERATION NOISE – CARBON KNOCK ON ACCELERATION – VEHICLES EQUIPPED WITH 4.0L OHV ENGINE ONLY FORD: 1990-1997 AEROSTAR 1990-2000 EXPLORER, RANGER ISSUE Some vehicles equipped with the 4.0L OHV engine may exhibit an engine noise which may be perceived by the customer as a piston/connecting rod bearing knock. This carbon knock is heard only under load during the drive cycle. Carbon knock is a customer drive duty-cycle phenomenon that cannot be repaired with an engine exchange. This may be caused by carbon build-up within the combustion chamber. ACTION Verify condition. If normal diagnostics fail to correct the condition, de-carbon the combustion chamber to help quiet the carbon knock noise. Refer to the following Service Procedure for details. SERVICE PROCEDURE

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