1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Welcome to Allpar. Being EFI, it does have a 'ck eng' or 'power loss' warning light. The bulb may be out or some owners may have pulled the bulb instead of fixing the problem. Its location should be shown in your owners or service manual.
The first job is diagnosis and locating the noise source. Is it upper or lower end? I doubt that it is fuel knock if it occurs at idle and closed throttle. Carbon knock is possible and some fuel additives like Techron may help.
It possibly has the roller cam that ran quieter than the conventional rockers. Wrist pin noise was also common, but these engines kept running for years without coming apart.
Factory service manuals this may help keep the car in good shape and be a priceless information tool:
http://www.faxonautoliterature.com/1988-MoPar-FWD-Car-Repair-Shop-Manual-3-Vol-Set-P16299.aspx
http://www.ebay.com/itm/1988-PLYMOUTH-HORIZON-FACTORY-ORIGINAL-OWNERS-MANUAL-/200520923074
The first job is diagnosis and locating the noise source. Is it upper or lower end? I doubt that it is fuel knock if it occurs at idle and closed throttle. Carbon knock is possible and some fuel additives like Techron may help.
It possibly has the roller cam that ran quieter than the conventional rockers. Wrist pin noise was also common, but these engines kept running for years without coming apart.
Factory service manuals this may help keep the car in good shape and be a priceless information tool:
http://www.faxonautoliterature.com/1988-MoPar-FWD-Car-Repair-Shop-Manual-3-Vol-Set-P16299.aspx
http://www.ebay.com/itm/1988-PLYMOUTH-HORIZON-FACTORY-ORIGINAL-OWNERS-MANUAL-/200520923074