Go Back   F150online Forums > Powertrain & Mechanical > V8 Engines
Sign in using an external account
Register Forgot Password?

Welcome to F150Online Forums!
Welcome to F150Online.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the F150Online Forums community today!





Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 07-24-2004, 01:25 AM
Junior Member
 
Join Date: Jun 2004
Vehicle: 1997 Ford F150
Posts: 15
Why does my truck keep dying?

My truck keeps on dying whenever i slow down. I'll drive fine down the road, no problems, when i slow down and come close to a stop it dies. I can put it in park and start it up again no problem. When I put it in gear it idles at about 400-500 RPM's. That seems a little low to me, is it? It will idle without dying but when I come to a stop it dies. The battery is obviously fine because it starts up everytime. At first I was thinking it was the torque converter, but it's not like it's still trying to push foward, it just dies? Any ideas or suggestions greatly appreciated. Thanks. It is a '97 F150, 4.6L, V8.
Reply With Quote
  #2  
Old 07-24-2004, 07:52 AM
Senior Member
 
Join Date: Mar 2001
Location: Indianapolis, IN, USA
Vehicle: 2003 Ford F150
Posts: 388
It certainly could be one of many things. Could be the fuel filter or air filter among other things. Have those been changed out recently? That would be an easy place to start.

Hunt4Fun
__________________
1993 Flareside XLT, regular cab, rebuilt 4.9, 2WD, E4OD.

2003 XLT, daily driver, 5.4L, AT, fiberglass tonneau cover, backup camera.
Reply With Quote
  #3  
Old 07-24-2004, 10:15 AM
Junior Member
 
Join Date: Jun 2004
Vehicle: 1997 Ford F150
Posts: 15
I haven't changed the fuel filter lately. But if it was the fuel filter, would it still drive fine down the road? I just put an intake on it about two months ago so I don't think that is it. Maybe though, I will clean it today. Thanks for the suggestions.
Reply With Quote
  #4  
Old 07-24-2004, 05:11 PM
Senior Member
 
Join Date: Feb 2001
Location: Guyton, GA USA
Vehicle: 2012 Ford F150
Posts: 748
Sounds like you need to clean or replace your Idle Air Control Valve (IAC). Takes about 30 minutes to accomplish this task.
Reply With Quote
  #5  
Old 07-24-2004, 05:29 PM
Member
 
Join Date: Jul 2004
Location: CA
Vehicle: 2004 Ford F150
Posts: 40
I had a problem with my '77 F150 (400 engine). I would be driving and my truck would die at full speed. I would restart during deceleration which was interesting on a freeway. Turned out problem was electrical and replacing the square black box (coil, or electronic..can't remember). Just in case the obvious fuel flow fixes don't work.
Reply With Quote
  #6  
Old 07-24-2004, 08:14 PM
Junior Member
 
Join Date: Jun 2004
Vehicle: 1997 Ford F150
Posts: 15
Yankee, how do I replace the Idle Air Control Valve. Is there a website or forum that will tell me how to do it? Thank you very much.
Reply With Quote
  #7  
Old 07-25-2004, 12:54 AM
Senior Member
 
Join Date: Apr 2000
Location: Hollywood, CA
Vehicle: 1997 Ford F-150
Posts: 1,822
Send a message via ICQ to Pickup Man Send a message via Yahoo to Pickup Man
idle air control valve? Is this it?
http://f150online.com/forums/showthr...ight=iac+clean
http://f150online.com/forums/showthr...ight=iac+clean
Search for more info.
Reply With Quote
  #8  
Old 07-25-2004, 11:45 PM
Junior Member
 
Join Date: Jun 2004
Vehicle: 1997 Ford F150
Posts: 15
well i pulled the IAC off and cleaned it with brake cleaner a couple of times and it still didn't look that great to me, my truck does have 160 thousand miles on it, so i went ahed and replaced it and it fixed the problem and I have noticed that my truck idles better. Especially on start up, the RPMs used to shoot up to about 2500 to almost 3000 and now it starts clean without the high rpms. Thanks for all your help guys, it is greatly appreciated. And it saved me a hell of a lot of money. Thanks.
Reply With Quote
  #9  
Old 07-26-2004, 03:28 AM
Senior Member
 
Join Date: Apr 2000
Location: Hollywood, CA
Vehicle: 1997 Ford F-150
Posts: 1,822
Send a message via ICQ to Pickup Man Send a message via Yahoo to Pickup Man
Glad it got `r` fixed!
Reply With Quote
  #10  
Old 07-27-2004, 12:27 AM
Junior Member
 
Join Date: Jun 2004
Vehicle: 1997 Ford F150
Posts: 15
Bad news, it died again today on the way to work so i finally took it to my mechanic and he hooked it up to his machines. The barometer in the mass air sensor has gone out and it is reading like i'm 3 thousand feet higher then i really am so the engine is getting the wrong mixture of fuel and it idles all screwed up. Not to mention killing horsepower and gas mileage. A new mass air sensor is only $110 bucks and two little bolts. Still not a very big deal. Thanks again for all your help, and the IAC probably needed to be replaced because it was VERY dirty and it does idle and start better then it did before. So we'll see.
Reply With Quote
  #11  
Old 07-27-2004, 12:22 PM
Senior Member
 
Join Date: Feb 2001
Location: Guyton, GA USA
Vehicle: 2012 Ford F150
Posts: 748
Glad to help.
Reply With Quote
  #12  
Old 07-27-2004, 01:30 PM
Technical Article Contributor
 
Join Date: Oct 2003
Location: Topeka Kansas
Vehicle: 1999 Ford F150
Posts: 1,490
I would like to add add that the upper intake plenum ports can get clogged up on the 4.6L engines.

http://www.fordf150.net/howto/throttlebodyclean.php
__________________
Larry,
1999 Ford F150 Lariat Flareside Extended Cab, 4x4, 5.4L engine.
Reply With Quote
  #13  
Old 07-27-2004, 03:49 PM
Junior Member
 
Join Date: Sep 2002
Location: Charleston, South Carolina
Vehicle: 2007 Ford F-150
Posts: 19
I was having the same problem. I called the dealer and they wanted 250 to replace it. I just want to says thanks to all. I took the IAC off and cleaned in and put it back on. It took about an hour. The truck has been running great again for a week now. thanks for the help on the web site.
Reply With Quote
  #14  
Old 07-28-2004, 02:07 AM
Junior Member
 
Join Date: Jun 2004
Vehicle: 1997 Ford F150
Posts: 15
I put a new mass air flow sensor on today and it still died. I checked the upper intake ports and they are clear and suckin air like they should. I don't know what to do. It ran fine all day untill I put the new air flow sensor on it. The reason i even changed it was because the barometric pressure was still to low on the old one. What do I do know, any other suggestions? Thanks? Also if I clean the IAC what do I clean it with. Its brake cleaner all right?
Reply With Quote
  #15  
Old 07-28-2004, 12:33 PM
Senior Member
 
Join Date: Sep 2003
Location: Aggieland, TX
Vehicle: 1997 Ford F150 4x4
Posts: 3,053
You probably need to make sure you reset the computer. It may still be trying to adjust using the old PCM's bad readings.

Disconnect the negative battery cable and switch your headlights to on.

Let it sit for about 30 minutes. Then put it all back and start the truck. Just let it idle for about 10 minutes, and dont run any accessories (radio, AC, etc).

To clean the IAC I used intake cleaner, you're not supposed to use brake cleaner on our intakes because they have special coatings and brake cleaner eats that away, or something like that.
Reply With Quote
Old 07-28-2004, 12:33 PM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are Off


All times are GMT -4. The time now is 01:07 AM.


 
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details