Question about 1990 Oldsmobile Eighty Eight

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My Oldsmobile 88 Royale is intermittently running rough. I have tried to track down the problem but haven't found it, yet. I got the diag codes from the computer and it showed a 48 (misfire diagnosis. So I replaced the plugs, wires, and coil pack. Now I am not getting any codes and it still runs rough. I did notice that it seems to correspond with an issue I am having with the radio. It seems that when the car runs well the radio will not output at full volume. You have to turn it up more that half way to be able to hear it. When the engine starts to run rough the radio outputs at the correct volume, driving you out of the car because it has been turned up so loud. Any ideas what could be causing this?

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  • Oldsmobile Master
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Hav u inspected the distributer system--also the ignition module-these things wear car is gitten up there! dont forget fuel delivery pump,injectors etc buy a haynes manual at a parts place

Posted on Feb 01, 2010

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  • Oldsmobile Master
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CHECK FOR VACUUM LEAKS ON INTAKE LOOK FOR CRACK OR BROKE VACUUM HOSES.REPLACE FUEL FILTER CLEAN FUEL INJECTORS THEY COULD BE STOPPED UP.FILL UP FUEL TANK ADD A BOTTLE INJECTOR CLEANER TO FUEL TANK.AS YOU DRIVE CAR AROUND THE CLEANER WILL CLEAN OUT INJECTORS.IF CAR STILL RUN ROUGH HAVE IT COMPRESSION TESTED.COULD HAVE WEAK CYLINDER OR LOW COMPRESSION CAUSED BY WORN ENGINE VALVES.

Posted on Feb 01, 2010

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