1992 4.9 problem - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Trucks | Utes | Vans |SUVs | Crossovers > Ford F-100 | Ford F-150 | Ford F-250 | Ford F-350 | Ford Super Duty | Ford Diesel
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

Ford F-100 | Ford F-150 | Ford F-250 | Ford F-350 | Ford Super Duty | Ford Diesel Forum for discussion of the Ford F100, F150, F250, F350, Superduty and Diesel trucks.

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 06-18-2012, 10:46   #1 (permalink)
Registered User
 
Join Date: Jun 2012
Posts: 4
1992 4.9 problem

Hey there guys I have a problem with my 92 Ford f150 4.9 and have no idea what to do next. Here's the run down a couple months ago I was at a stop light and the rpms suddenly dropped and got all erratic. From that point on it had trouble idling. I drove it for a couple months after that but it got worse and worse. I was forced to feather the throttle to keep it running. Now here is a list of parts replaced that did nothing for the problem. Fuel pump, fuel filter, distributor, cap and rotor, plugs and wires, throttle position sensor, fuel pressure regulator, EGR solenoid, ECU computer. Im probably even forgetting some. But none of these have helped. The truck starts but you have to continually pump the gas to keep it running. There are moments when it will just purr for a split second then go right back to running horribly. So please if you have any suggestions I would greatly appreciate them. Im at the point that I've put so much into it I refuse to give up now!
garskejp is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-18-2012, 10:52   #2 (permalink)
Moderators
 
Join Date: Apr 2007
Location: Scotland
Posts: 10,115
Re: 1992 4.9 problem

Idle control valve ?
R.S.LOGAN is offline   Reply With Quote
Old 06-18-2012, 11:22   #3 (permalink)
Registered User
 
Join Date: Jun 2012
Posts: 4
I have not replaced that but do you think that could have that much of an effect on it.

Sent from my DROID BIONIC using AutoGuide.Com Free App
garskejp is offline   Reply With Quote
Old 06-18-2012, 11:30   #4 (permalink)
Moderators
 
Join Date: Apr 2007
Location: Scotland
Posts: 10,115
Re: 1992 4.9 problem

Quote:
Originally Posted by garskejp View Post
I have not replaced that but do you think that could have that much of an effect on it.

Sent from my DROID BIONIC using AutoGuide.Com Free App
Does what the name implies .

How an Idle Air Control Valve Works
An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or PCM (powertrain control module) receives information from various sensors and will output signals to adjust the idle air control motor in or out to adjust engine idle speed by controlling engine idle air. An idle air control motor can fail one of two ways, either the motor short circuits and stops working or the motor will develop high resistance and cause the idle air control motor to react slowly, either failure can cause the engine to stall at idle. When a trouble code scan is performed it sometimes won't always detect a failed or weak idle air control motor.

Could try cleaning it first , but may need replacing .
R.S.LOGAN is offline   Reply With Quote
Old 06-20-2012, 16:12   #5 (permalink)
Registered User
 
Join Date: Jun 2012
Posts: 4
Re: 1992 4.9 problem

Id check easy dumb things first. Check all your intake tubes and make sure there's no vacuum leaks. Also get some throttle body cleaner and clean it. Sometimes that flange gets gummed up and sticks. If all that fails, then try cleaning the IACV.
FORDF150JUNK is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Trucks | Utes | Vans |SUVs | Crossovers > Ford F-100 | Ford F-150 | Ford F-250 | Ford F-350 | Ford Super Duty | Ford Diesel



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 16:27.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.