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Old 07-15-2005, 06:19 PM   #1
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RPM drop

Ive noticed lately when I brake mild to hard like for a stop light, my engine rpm will drop near or below 500 and begin to do the chug thing like its gonna die. its a manual so I rev it when this happens. do I need to clean my throttle body?? or what might this be (55,000 miles)
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Old 07-15-2005, 06:28 PM   #2
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be sure your clutch is pushed down all the way
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Old 07-15-2005, 06:39 PM   #3
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Is your clutch acting up any? Is your a/c on? etc etc.
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Old 07-15-2005, 06:49 PM   #4
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my clutch is fine that I know of, I have a syncro problem with 5th gear but thats it
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Old 07-15-2005, 06:55 PM   #5
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Clean your IAC. It is what controls your idle speed and a sticky one might do this.

Also, as I am not a Ford guy this may not be relevant, but on EFI Mopars there is a speed senspr connected to the computer. When it starts to fail (wrong pulse counts but not dead) then you get this symptom.

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Old 07-15-2005, 07:33 PM   #6
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clean your maf with some no residue contact cleaner for electrical parts (radio shack or autozone has it) then clean the idle bypass valve, its on the upper intake behind the TB.

See if that helps, do you run your AC? mine idles low if I run it and I am stopped.
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Old 07-15-2005, 08:20 PM   #7
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my clutch is fine that I know of, I have a syncro problem with 5th gear but thats it
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Old 07-15-2005, 08:22 PM   #8
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Wow...a repost 2 hours later...lol.
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Old 07-15-2005, 08:28 PM   #9
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I would also check for vacuum leaks.
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Old 07-15-2005, 10:06 PM   #10
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mine did that for a bit when i put the CAI on. then once the ECU learned the new air flow settings it fixed it.

a few times it stalled me out too

so i don't think its clutch related
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Old 07-15-2005, 10:29 PM   #11
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Quote:
Originally Posted by Danger Dude
I would also check for vacuum leaks.
I was thinking the same thing. There are few things that would cause Vacuum leaks. A sticky TB plate will cause the TB to stay open a little, so you can check that as well.
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Old 07-15-2005, 10:41 PM   #12
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Quote:
Originally Posted by 97Stallion
I was thinking the same thing. There are few things that would cause Vacuum leaks. A sticky TB plate will cause the TB to stay open a little, so you can check that as well.
Also check the hose that goes from the Brake booster to the upper intake. It can dryrot and get brittle and crack.
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Old 07-16-2005, 01:32 PM   #13
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mine does the low rpm thing from tiem to time, i clean the maf and it goes back to normal.
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