1972 MGB RPM GOES DOWN VERY SLOWLY..WHY

  • Tiny
  • manico
  • 1972 MG MGB

Engine Performance problem
1972 MGB 4 cyl Two Wheel Drive Manual 60000 miles

Hi. When I rev the car up (engine at it normal running temp)and take my foot off the accelerator, the revs dont go down properly. They slowly go down to the idle setting. Ive checked the accelerator cable and most moverble parts to the external sides of the carb. What is causing it plz

Thursday, March 11th, 2010 AT 2:24 PM

1 Answer

  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

If still using twin SU carbs then may need oil in piston. Unscrew black knob on top fill with oil up to top of chamber. This acts like a shock and helps close piston.

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Thursday, March 11th, 2010 AT 2:47 PM

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