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Car idle drops below 500 rpm and bogs down.


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Austin8341
Novice

Aug 7, 2019, 6:30 PM

Post #1 of 2 (826 views)
Car idle drops below 500 rpm and bogs down. Sign In

I have a 2004 v6 3.9 Mustang and when at idle and slowly pressing down the throttle, it bogs down and seems to get caught around 1500 rpm and then picks back up and runs fine after it. However, when giving it more throttle it doesn’t seem to hesitate at all. Also, when the revving at idle and letting off the throttle, the car drops below 500 rpm and shakes really bad and almost turns off. When stopping at red lights it does the same thing. Also, sometimes when driving the car does not want to accelerate at all but once I finally get down on the throttle it runs fine. The video is a video of it dropping low and almost turning off after reviving at idle and the car in the background is not me and it is also raining in the video. It also has fairly new spark plugs and a clean air filter. If anyone knows what this could be then please let me know, thanks. https://youtu.be/mbWrjGmWdp4


(This post was edited by Austin8341 on Aug 7, 2019, 6:36 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 7, 2019, 6:50 PM

Post #2 of 2 (813 views)
Re: Car idle drops below 500 rpm and bogs down. Sign In

 
First eliminate all vacuum or air leaks in the system (very important)

. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.



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