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why do my rpm's drop

Old 04-04-2007, 09:57 PM
  #1  
8892mustang
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Default why do my rpm's drop

I HAVE A 5.0 MUSTANG AND THE RPM DROP WHEN I STEP ON BRAKE.
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Old 04-04-2007, 10:01 PM
  #2  
TwotoneVert
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Default RE: why do my rpm's drop

I am guessing you have maybe a 92? What mods do you have? What have you done recently? Did it just start doing this, or has it gradually gotten worse? We need a little more info please.
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Old 04-04-2007, 10:09 PM
  #3  
8892mustang
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Default RE: why do my rpm's drop

I HAVE A 92 LX , FEW MODS LIKE UNDER DRIVE PULLEYS, AIR INTAKE, 70 MMTB, IT HAS BEEN DOING THIS FOR AWHILE . SOMEONE TOLD ME IT WAS THE BRK BOOSTER, IS THIS POSSIBLE
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Old 04-04-2007, 10:29 PM
  #4  
00blackstang
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Default RE: why do my rpm's drop

Theres a Vacuum Hose that goes from the brake booster to the intake manifold... check to see if its loose, or possible has a hole in it... my car was doin that as well, and it turns out that vacuum hose had a hole in it
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Old 04-04-2007, 10:31 PM
  #5  
8892mustang
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Default RE: why do my rpm's drop

I HAVE REPLACED IT THAT HOSE ALONG WITH SOME OTHERS.
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Old 04-06-2007, 10:39 AM
  #6  
richinwa
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Default RE: why do my rpm's drop

Does the RPM's drop a small amout or is there a major drop? You shouldbe able to see a small drop in RPM's but nothing major in a normal system. If it is major check the brake booster for leaks.
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