idle air control valve?
Thread Starter
|
New User
Joined: Jan 2001
Posts: 2
Likes: 0
idle air control valve?
Hi all, I have a problem with my truck which I hope someone can help me with.
My truck is a '91 f150 5.0 EFI 5 speed. The problem is that it revs wildly up and down, sometimes stalling and backfiring. It seems to 'idle' (if that's what you want to call it) at about 2000 RPM's. The only way that I can still drive my truck is to unplug the 'idle air control valve'.
The problem is that when I do that, the truck still runs very poorly and idles around 12-1300 RPM and occasionally stalls and backfires.
Please help me if you can. I am not a mechanic (I'm a Plumber) but if you could point me in the right direction I sure would appreciate it.
Thanks very much.
My truck is a '91 f150 5.0 EFI 5 speed. The problem is that it revs wildly up and down, sometimes stalling and backfiring. It seems to 'idle' (if that's what you want to call it) at about 2000 RPM's. The only way that I can still drive my truck is to unplug the 'idle air control valve'.
The problem is that when I do that, the truck still runs very poorly and idles around 12-1300 RPM and occasionally stalls and backfires.
Please help me if you can. I am not a mechanic (I'm a Plumber) but if you could point me in the right direction I sure would appreciate it.
Thanks very much.
Thread Starter
|
New User
Joined: Jan 2001
Posts: 2
Likes: 0
idle air control valve?
I am sorry I meant to say that is mis-fires! Not that is backfires.
I had the truck looked at once and they said that the idle air control valve was in fact full of carbon and that they had cleaned it and everything was just fine with my truck. It did not work though as it still runs like ***** and did so from the minute I picked it up from the shop. I have since replaced the entire unit and still no joy.
Sorry about the mistake and thanks for your continued help.
Posting Guru
Joined: Jun 1999
Posts: 1,525
Likes: 1
idle air control valve?
If in fact the IAC was that carboned up, did they clean the rest of the throttle body while they were at it ? The Fords that I have dealt with have needed the throttle body cleaned (and I mean a good cleaning, which involves a brush !) at least twice a year PLUS every time the battery was disconnected or the battery went lower then 6-7 volts, to insure good idle quality and off idle acceleration. Get the throttle body cleaned up properly,then check the TPS for faults, then check ALL your vacuum lines & fittings...you should find the cure.
Phil
Phil
Junior User
Joined: Dec 2000
Posts: 90
Likes: 0
From: Middle Tennessee
idle air control valve?
You may have a broken gasket where the upper intake manifold bolts to the lower manifold. Hard to see the break without actually removing the upper manifold and looking at the gasket.
Postmaster
Joined: Jul 1999
Posts: 3,172
Likes: 4
idle air control valve?
Phillip is correct about the throttle body cleaning , if they are carboned up the best way , at least in my dealings with them, is to remove the throttle body to clean it . Its only 4 bolts & really doesnt add a lot of labor time & that way you can be sure all the carbon is off the throttle plates .
Trending Topics
Senior User
Joined: Mar 2000
Posts: 337
Likes: 0
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
Dany Boyd
Modular V10 (6.8l)
1
Jun 29, 2015 07:18 PM
08gasurveyor
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
41
Jan 20, 2012 09:05 AM
resmith1
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
3
Oct 11, 2005 10:25 PM
toriumguy
1983 - 2012 Ranger & B-Series
7
Feb 8, 2005 10:23 PM