PLEASE HELP!! 85 GL 145k LOUD heavy knock with power loss, added oil, better until 3500rpm loud knock returned, how do I test for problem source ? What do I do first? (have exhausted search feature). Has history of TOD used all treatments no luck. Have pulled plugs to check for a rod bearing-no differences. Afraid to drive, might blow engine? desperate-Need car for work
HISTORY-Have tuned, changed oil 3x with all trmts MMO/seafoam/BG 44k, used Mobile1 10w30, no improvement in HLA noise on drivr side. Driving for 500mi with noise, then..driving at 75 loss of power down to 50mph, loud knocking on pass side- found very low on oil, added to full, pulled plug wires 1 at a time..no change so...I started OK- much improved. Drove 1mi at 3500rpm loud knocking/power loss returned. Now what?????