Idle Issues
Thread Starter
|
Freshman User
Joined: Dec 2006
Posts: 25
Likes: 0
Idle Issues
I HAVE A 2000 FORD F150 4x4 XLT 5.4L WITH 89,000 MILES AND AM HAVING A PROBLEM WITH ENGINE REEVING UP AT IDLE FOR A SECOND THEN DROPPING DOWN. THIS WILL HAPPEN ABOUT TWICE A MINUTE AT IDLE. I HAVE A K&N FILTER IN STOCK AIR BOX AND I AM CAREFUL TO ALLOW FILTER TO DRY AFTER CLEANING. I HAVE CLEANED THE TEMPERATURE SENSOR IN INTAKE DUCT WITH CONTACT CLEANER. I AM SPOOKED TO CLEAN THE M.A.S.IN FEAR OF MESSING UP A $400+ PART. DOES ANYONE HAVE ANY SUGGESTIONS AS TO WHAT THE PROBLEM COULD BE?
Thread Starter
|
Freshman User
Joined: Dec 2006
Posts: 25
Likes: 0
Thanks, will try cleaning iac valve/Maf this weekend while I install Aem brute force intake--Anybody heard anything good about these? I was a little bummed about the fact that the filter was bent up in shipping but am really excited so I might just put the system on with a bent up filter until the replacement comes in--I think the filter should be fine even though its bent up? Appreciate the help!
Thread Starter
|
Freshman User
Joined: Dec 2006
Posts: 25
Likes: 0
Put AEM cold air intake in this weekend 
and cleaned MAS and IAC sensor and the truck still reeves up but only on an incline.
There was a slight amount of oil residue in the original crank case breather tube, is this normal or could this be some of the problem. Where is the IAC valve located? I'm know getting concerned that this may not be a simple fix.
and cleaned MAS and IAC sensor and the truck still reeves up but only on an incline. There was a slight amount of oil residue in the original crank case breather tube, is this normal or could this be some of the problem. Where is the IAC valve located? I'm know getting concerned that this may not be a simple fix.
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
The IAC is going to be on top of the engine and mounted to the throttle body. It looks like a small electric motor. Has two bolts holding it to the throttle body and a wiring connector plugged into it. Good luck! 
Trending Topics
Hotshot
Joined: Jun 2003
Posts: 12,350
Likes: 4,383
From: SW VA
The IAC is rediciously easy to replace. I lit a cigarette, got out my tools, changed it, started up the truck, and still had half my cigarette left... 
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
New User
Joined: Jul 2007
Posts: 14
Likes: 0
From: Florida,it's flat and hot
I'm having the same problem on my 97 f150 4.6 and it also tends to stall.I changed the IAC and it stopped stalling but not completly,the idle is still rough.Let me know if you figure it out.
Thread Starter
|
Freshman User
Joined: Dec 2006
Posts: 25
Likes: 0
Update
Changed IAC valve completely last night and wouldn't you know it as soon as I fired the truck up it started doing that reving thing again. I guess my next step is to look for vacuum leaks although I'm not sure were to start! Anyone have any suggestions about what to do next?
Thread Starter
|
Freshman User
Joined: Dec 2006
Posts: 25
Likes: 0
Apon closer inspection of the entire intake system I noticed a loud humming coming from the pcv valve and replaced it. I think that was the issue because truck seems to idle fine now so stevebe1fl you may want to look at that. Thanks to everyone for the advice. Kinda glad this problem happened because now I know that the intake system is clean and with a new IAC valve I swear it runs smoother!
Thread
Thread Starter
Forum
Replies
Last Post
twise
1973 - 1979 F-100 & Larger F-Series Trucks
18
Jun 18, 2014 07:05 AM
Bowtie_Schmowtie
1987 - 1996 F150 & Larger F-Series Trucks
6
Jan 11, 2011 03:16 PM
