Revving slowly??

PhillyGT · September 13th, 2011, 07:09 PM

Ok when i rev up my engine the rpm's drop slowly.I just noticed it.It runs fine,but it sounds kinda odd.When i get on it,it's fine it,its just when the revs dropoff,they dont drop fast.Any ideas?

Chris951 · September 13th, 2011, 10:45 PM

Clean your IAC and throttle body. Mine comes down normally but will hang at 1k.. my 88 I had would drop quick back to idle. It sounded like it was carbed. The throttle response was a amazing and never had an issue with rpms hanging or idle issues. I think its because it was speed density though

PhillyGT · September 18th, 2011, 12:18 PM

Ok so i cleaned the IAC and put it back on.Now when i rev it,the idle drops,and then hangs at 1000 rpm's then drops to normal range.WTF?.It wasnt doing this before i cleaned it,it was just revving slowly.What do i do to fix this????

PhillyGT · September 18th, 2011, 04:20 PM

Anyone??

Chris951 · September 18th, 2011, 06:13 PM

Its normal I've been told. Mine does the same after cleaning it and so does my friend's

PhillyGT · September 18th, 2011, 07:20 PM

Is it gonna stop?I took off the battery cables for a while today,and when i hooked it back up,the idle is a little better.When i rev it,it falls to about 1000rpm's hangs for a second ,then goes to normal.Its doing it a little faster than it did earlier.Would resetting the computer help???

slow.0 · September 18th, 2011, 10:35 PM

My 94 slow.0 does the same thing. i'm going to bring it into a buddy of mine to see what he thinks BUT I've changed the TB / IAC and it still does the same anytime I have the IAC plugged in. I'm wondering if it's either a computer / power issue to the IAC. My car has LOADS of issues as I bought it with them. I'll post my findings by Weds

Chris951 · September 18th, 2011, 10:41 PM

Clean your salt and pepper shakers! I completely forgot about these. I just got done cleaning mine and greasing them and holy shit it made a big difference. Not only in the idle, but the way the car drives also. Please give this a try on your car. I guarantee it will help. Also clean or change your pcv valve. I cleaned mine with carb cleaner because it wasn't terrible and I'm sure that helped too.

Here's a write up on the salt and pepper shakers. You don't have to spread the male connectors like it says. I didn't. I just packed a lot of dielectric grease in them.
Cleaning the 10 Pin connectors on a Mustang | The Mustang Stop

slow.0 · September 18th, 2011, 11:07 PM

This didn't even cross my mind. I'll give it a shot tomorrow as long as the rain lets up. Unfortunately I don't have a garage to work in :-P ... Post results as soon as I'm finished! :-)

PhillyGT · September 19th, 2011, 08:42 AM

This is the weird part,the idle didnt hang at all before cleaning the iac.When i revved it the revs would just drop slowly.Now i clean the IAC and the idle hangs when droppingl.I should have just left the IAC alone!!

Chris951 · September 19th, 2011, 04:25 PM

No. Mine did that too after cleaning it. How bout u clean your salt and pepper shakers because it fixed my issues

PhillyGT · September 19th, 2011, 04:38 PM

Did it really make a difference cleaning the salt&pepper shakers???

Chris951 · September 19th, 2011, 09:17 PM

Very big difference

September 13th, 2011, 07:09 PM	#1
PhillyGT Enthusiast 2001 Mustang GT 13.8@101.58mph! Join Date: Feb 2010 Location: Philadelphia PA Posts: 621 iTrader: 0 reviews	Revving slowly?? Ok when i rev up my engine the rpm's drop slowly.I just noticed it.It runs fine,but it sounds kinda odd.When i get on it,it's fine it,its just when the revs dropoff,they dont drop fast.Any ideas? __________________ Dropped on Eibachs,K&N FIPK,Mac-prochamber o/r,Flowmasters.Short throw,Heavy Right Foot Mod

September 18th, 2011, 12:18 PM	#3
PhillyGT Enthusiast 2001 Mustang GT 13.8@101.58mph! Join Date: Feb 2010 Location: Philadelphia PA Posts: 621 iTrader: 0 reviews	Ok so i cleaned the IAC and put it back on.Now when i rev it,the idle drops,and then hangs at 1000 rpm's then drops to normal range.WTF?.It wasnt doing this before i cleaned it,it was just revving slowly.What do i do to fix this???? __________________ Dropped on Eibachs,K&N FIPK,Mac-prochamber o/r,Flowmasters.Short throw,Heavy Right Foot Mod

September 18th, 2011, 04:20 PM	#4
PhillyGT Enthusiast 2001 Mustang GT 13.8@101.58mph! Join Date: Feb 2010 Location: Philadelphia PA Posts: 621 iTrader: 0 reviews	Anyone?? __________________ Dropped on Eibachs,K&N FIPK,Mac-prochamber o/r,Flowmasters.Short throw,Heavy Right Foot Mod

September 18th, 2011, 07:20 PM	#6
PhillyGT Enthusiast 2001 Mustang GT 13.8@101.58mph! Join Date: Feb 2010 Location: Philadelphia PA Posts: 621 iTrader: 0 reviews	Is it gonna stop?I took off the battery cables for a while today,and when i hooked it back up,the idle is a little better.When i rev it,it falls to about 1000rpm's hangs for a second ,then goes to normal.Its doing it a little faster than it did earlier.Would resetting the computer help??? __________________ Dropped on Eibachs,K&N FIPK,Mac-prochamber o/r,Flowmasters.Short throw,Heavy Right Foot Mod

September 19th, 2011, 08:42 AM	#10
PhillyGT Enthusiast 2001 Mustang GT 13.8@101.58mph! Join Date: Feb 2010 Location: Philadelphia PA Posts: 621 iTrader: 0 reviews	This is the weird part,the idle didnt hang at all before cleaning the iac.When i revved it the revs would just drop slowly.Now i clean the IAC and the idle hangs when droppingl.I should have just left the IAC alone!! __________________ Dropped on Eibachs,K&N FIPK,Mac-prochamber o/r,Flowmasters.Short throw,Heavy Right Foot Mod

September 13th, 2011, 10:45 PM	#2
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	Clean your IAC and throttle body. Mine comes down normally but will hang at 1k.. my 88 I had would drop quick back to idle. It sounded like it was carbed. The throttle response was a amazing and never had an issue with rpms hanging or idle issues. I think its because it was speed density though

September 18th, 2011, 06:13 PM	#5
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	Its normal I've been told. Mine does the same after cleaning it and so does my friend's

September 18th, 2011, 10:35 PM	#7
slow.0 Newbie 1994 Mustang GT Join Date: Sep 2011 Location: Elk Grove Village Posts: 3 iTrader: 0 reviews	My 94 slow.0 does the same thing. i'm going to bring it into a buddy of mine to see what he thinks BUT I've changed the TB / IAC and it still does the same anytime I have the IAC plugged in. I'm wondering if it's either a computer / power issue to the IAC. My car has LOADS of issues as I bought it with them. I'll post my findings by Weds

September 18th, 2011, 10:41 PM	#8
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	Clean your salt and pepper shakers! I completely forgot about these. I just got done cleaning mine and greasing them and holy shit it made a big difference. Not only in the idle, but the way the car drives also. Please give this a try on your car. I guarantee it will help. Also clean or change your pcv valve. I cleaned mine with carb cleaner because it wasn't terrible and I'm sure that helped too. Here's a write up on the salt and pepper shakers. You don't have to spread the male connectors like it says. I didn't. I just packed a lot of dielectric grease in them. Cleaning the 10 Pin connectors on a Mustang \| The Mustang Stop

September 18th, 2011, 11:07 PM	#9
slow.0 Newbie 1994 Mustang GT Join Date: Sep 2011 Location: Elk Grove Village Posts: 3 iTrader: 0 reviews	This didn't even cross my mind. I'll give it a shot tomorrow as long as the rain lets up. Unfortunately I don't have a garage to work in :-P ... Post results as soon as I'm finished! :-)

September 19th, 2011, 04:25 PM	#11
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	No. Mine did that too after cleaning it. How bout u clean your salt and pepper shakers because it fixed my issues

September 19th, 2011, 04:38 PM	#12
PhillyGT Enthusiast 2001 Mustang GT 13.8@101.58mph! Join Date: Feb 2010 Location: Philadelphia PA Posts: 621 iTrader: 0 reviews	Did it really make a difference cleaning the salt&pepper shakers??? __________________ Dropped on Eibachs,K&N FIPK,Mac-prochamber o/r,Flowmasters.Short throw,Heavy Right Foot Mod

September 19th, 2011, 09:17 PM	#13
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	Very big difference

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