Turbo Regal Knock Problem Check List

 

  1. Start-up knock?  Normal and usually caused by the starter engaging the flex plate.  Usually sets off 1-3 lights.

  2. Possible bad ECM or ESC module.  Test with good working units.

  3. Exhaust rattle � check the down pipe, tail pipes, and have engine tie down strap

  4. Boost creep especially top of 1st gear on 1-2 shift.

  5. Lean air/fuel mixture.

  6. To low octane gas � bad pump gas � try some race gas

  7. Too much timing in chip for fuel used.  Try different chip.

  8. Try cooler spark plugs � use only AC Delco (R43-TS or R42-TS)

  9. Gap plugs to .035

  10. Check torque converter bolts to make sure they are tight

  11. Loose harmonic balancer.  Make sure torqued to 200 ft/lb  Is keyway secure?

  12. Check internal engine noises like timing chains (roller), lifters/rockers, etc.

  13. Damaged knock sensor

  14.  Check fuel pump pressure and volume

  15.  Proper torque on knock sensor � 14 ft/lb

  16. Check Alternator voltage: 13.8 - 14.5v

  17. Check computer power wire - they can break internally.

  18. Trouble shoot the computer connector power wires and ground wires.

  19. Swap coil pack, wires, plugs w/known good units.

  20. Swap MAF with known good unit.

  21. Check battery ground connection @ block (clean/inspect).

  22. Check/change battery cables (both).

  23. Are there MAF leaks in the inlet tube?

  24. Are there vacuum leaks.  Use carb cleaner or WD-40 & spray everything.  Does the rpm    change?

  25. Disconnect the main injector harness - inspect, WD-40.  Check for moisture in main connector.

  26. Disconnect the coil-pack connector - inspect pins & spray w/WD-40.

  27. Is the cat still installed?  Is it good?

  28. Have you performed a leak down check?

  29. Do the rockers open/close?  Do we have a wiped cam lobe?

  30. Is the boost/vacuum steady @ idle?

  31. Is the engine over revving?  Should be 4,800-5,200 rpm

  32.  Carbon in cylinders?  Clean with GM engine top cleaner

  33.  Inter-cooler dirty?  Clean inside inter-cooler and fins

  34.  Oil in intake tract?

  35.  Check for exhaust leaks, cracked header

  36.  Battery good?

  37.  EGR valve in working order?

  38.  Check that no cables, wires, etc are touching the knock sensor

  39.  Blown head gasket?  Compression test.  Should be around 150.

  40.  Injectors flowing/working correctly?

  41.  Check vacuum line to fuel pressure regulator for cracks

 

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