long rev-down

[Teen'93stang5.0]

is it normal for the mod motors to take a long time to have the RPMs come down, (not in gear)

like i rev it up and it take a goob bit of time to come down, as opposed to my 5.0, it has a snappier rev to it,

i thought it was just a gunk build up on the TB so i hit it with a lot of carb cleaner and it did nothing,. can i put a stiffer sping on it?

i was just wondreing if thats normal


oh, and how do i use the maunal idel control thing, theres nothing there for a screwdriver or a wrench, am i missing something?

 

[Sam98]

is it normal for the mod motors to take a long time to have the RPMs come down, (not in gear)

like i rev it up and it take a goob bit of time to come down, as opposed to my 5.0, it has a snappier rev to it,

i thought it was just a gunk build up on the TB so i hit it with a lot of carb cleaner and it did nothing,. can i put a stiffer sping on it?

i was just wondreing if thats normal


oh, and how do i use the maunal idel control thing, theres nothing there for a screwdriver or a wrench, am i missing something?

Idle speed is controlled by the PCM and it is common for the 4.6L to take a long time for the revs to drop. There was another post recently dealing with this very issue. Just do a search for "pesky idle" and you should find it.

 

[Teen'93stang5.0]

hmmmm, so a chip could do something about it?

 

[Sam98]

hmmmm, so a chip could do something about it?

Yes...

 

[nickthegenius]

Here is some info for a cheap fix.

http://forums.stangnet.com/showthread.php?t=400411&highlight=copper

 

[Teen'93stang5.0]

yeah, i found that too, gonna give it a try for sure, but theres NO chance of that car goin into the engine right?

 

[GinoGT]

Nope, the copper cap is the same size as the small metal pipe coming out of the IAC. I've got it in mine, and it works pretty good, especially for only a couple cents.

 

[Teen'93stang5.0]

si then i assume that the cap goes between the black box and the IAC and not the other tube

 

[merc123]

I remember the Cougar club I belong to did this fix. It was called the Throttle Hang (TH) fix. After a while there were negative effects. I just can't remember what they were.

 

[GoBabyVroommm]

Can its be the exhaust too?

 

[Teen'93stang5.0]

oh this isnt sounding good..........figure out what it was so i can figure out how to fix it

 

[Teen'93stang5.0]

Can its be the exhaust too?

doubt it, the IAC lets air in after the TB closes so thats what i would bet on it being 99% of the time

 

[GoBabyVroommm]

doubt it, the IAC lets air in after the TB closes so thats what i would bet on it being 99% of the time

Just throwing it out there because sometimes that maybe the problem.

 

[Teen'93stang5.0]

Just throwing it out there because sometimes that maybe the problem.

yeah, id say if the exhaust was WAY too small it would cause it due to air not being able to get out

 

[Teen'93stang5.0]

well i did it today, drilled a 1/4" hole instead of 9/32 and grinded it down a bit, but it seems to have done the trick, still hands around 1500 a bit more than id like it

only downside is it seems to have made it a bit rougher driving, instead of being able to take my foot off the gas in gear i have to take it out of gear or else is slows the car down like downshifting, but hey, if im racing, or takeing a chick out i can always take it out first and put it back in after im done