05-26-11, 03:32 AM
Please Help! I have a 91 Fleetwood Brougham with a TBI 305 with 180,000 miles, it has a moderate to severe knocking that appears to be coming from the driver side cylinder bank. I have recently cleaned out the intake with Seafoam, installed a new heavy duty water pump and a thermostat and flushed the radiator, timed the engine to 0 degrees (factory setting), checked the PCV system, changed the oil with slick 50 high mileage treatment, and cleaned and re-gapped the spark plugs, although one on the drivers bank showed signs of detonation and the others on the bank had a considerable amount of white ash deposits, the passenger bank all looked normal (wires and cap and rotor in good shape). The engine only knocks when it is under load, it won't do it when the engine is idling or if in park and revving it up. I have recently discovered that it doesn't knock at all if I disconnect the EST wire (electronic spark timing). I took it for a drive down the road with the wire disconnected for quite a few miles and it did not knock at all. Could this be a problem with the computer or the ignition control module? Or maybe the Knock sensor? I plan on checking the EGR system tomorrow to see if it is functioning properly. Other than that i'm pretty much at a loss. Any feedback would be greatly appreciated, Thanks for your input.