slow rpm drop, is it normal?

D

D347643

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Jan 28, 2003

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portland, OR

Jun 7, 2004

#1

• Jun 7, 2004

• #1

i had a quick question,.... when i rev up my car the rpms come down slower than id like. now my friend has a carbed 350 and the rpms drop with a snap. i know carbed cars are dif than fuelies and my iac is practically brand new so i know its not getting caught up or anything. anybody have any ideas or is that normal... almost makes me want to buy a lightened flywheel

thanks,

Drew

 

D

D347643

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Jan 28, 2003

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portland, OR

Jun 7, 2004

#2

• Jun 7, 2004

• #2

also is it normal with fords to have a little lag when you get on the throttle? maybe normal with fuelies? i know that hondas and yodas do that

 

jrichker

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Jun 7, 2004

#3

• Jun 7, 2004

• #3

Are you rolling or standing still?


EDIT: When you are slowing down for a stop, the VSS sensor located on the speedo cable adapter on the trans tells the computer to slowly decrease the engine speed to keep the engine from stalling.

Standing still - WD40 all the throttle linkage real good.

 

hemi_fan

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Apr 8, 2004

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Jun 7, 2004

#4

• Jun 7, 2004

• #4

I dont know if its the same thing you're talking about, but when I shift, the RPMs dont drop right away. Say I shift at 3k rpm at a moderate speed, by the time its in gear and i let off the clutch, the rpm has JUST started to drop. Theres a delay... is that normal, or a tune issue?

 

D

D347643

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Jun 7, 2004

#5

• Jun 7, 2004

• #5

its when im standing still

 

Mustang5L5

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Mod Dude

Feb 18, 2001

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Jun 7, 2004

#6

• Jun 7, 2004

• #6

clean the 10-pin connectors

 

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blk92stangg

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Jan 30, 2004

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Jun 7, 2004

#7

• Jun 7, 2004

• #7

Could there be a diff betweent he aod and t5 ecu? My converted t5 car running the stock aod computer drops fast between shifts, if i shift too slowly the rpms drop too much. On the other hand, when i rev the engine, it drops to 1000, pauses, and then drops to idle. I'm thinking its a vac leak or sumthing, but a the same time, I also wonder if its a function of the aod puter?

 

D

D347643

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portland, OR

Jun 8, 2004

#8

• Jun 8, 2004

• #8

no im pretty sure the idle hang is normal, some people say to try and clean your iac but others say you have to deal with it.

 

CManT1914

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Jun 8, 2004

#9

• Jun 8, 2004

• #9

Mine does the same thing. RPMs drop real slow whether I'm revving the engine or I've pushed in the clutch and am coasting to a stop. It also "hangs" at 1000 for about a half second or so then idles down to about 650. This seems normal on all the Mustangs I've driven. I've put it on a computer at Ford when my MAF was out, and it didn't pull any other error codes. I'm not worried about it. My car runs like a bat out of hell considering I haven't done a lot to it.