Notices
1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

some questions

Thread Tools
 
Search this Thread
 
Old Jul 26, 2015 | 03:39 PM
  #1  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
some questions

hey guys, we just got a 92 f150 custom 5.0L

it was my grandfathers,he past away last month.he was great guy.

here are the problems we are having.

my dad went to go get it.and he said it was hard to get it to fire up.he got it back to the house and we poped the hood.and found about 3-5 connectors unhooked and one of those was the IAC so i reconnected and fired it up.she went right up to very high idle.so im guessing its the IAC,but my dad said he replace that not to long ago.

it has the dual tank setup.my grandfather said awhile back before he pasted that the front tank didnt work.but when my dad got it back to the house we checked it and the front tank fuel pump kicks on.when we start the truck you can hear it running the fuel tank is empty. it would do that if its empty right?
 
Reply
Old Jul 26, 2015 | 04:22 PM
  #2  
fordboy97's Avatar
fordboy97
Senior User
Joined: Aug 2014
Posts: 389
Likes: 0
some questions

Sounds like you might have a high tps voltage at idle, should be .5-1 volts if I recall correctly. But as they always say, pull the codes
 
Reply
Old Jul 26, 2015 | 06:07 PM
  #3  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
Originally Posted by fordboy97
Sounds like you might have a high tps voltage at idle, should be .5-1 volts if I recall correctly. But as they always say, pull the codes
how do i pull the codes?
 
Reply
Old Jul 26, 2015 | 09:15 PM
  #4  
88XLTLariat's Avatar
88XLTLariat
More Turbo
10 Year Member
Liked
Joined: Nov 2014
Posts: 686
Likes: 11
From: Plainfield, IN
https://www.ford-trucks.com/forums/1...er-to-use.html. Read this thread.
 
Reply
Old Jul 27, 2015 | 07:55 AM
  #5  
Zorfox's Avatar
Zorfox
Junior User
Joined: Sep 2010
Posts: 88
Likes: 1
You do need to pull the codes. I would also determine why the connectors are disconnected and hook them back up. You don't need a code reader for your truck. You can read the codes by using a jumper and counting the check engine light flashes. I have the same truck and have done it many times. Here is a post that explains how to do that...

How-To: retrieve trouble codes- OBDI - Ford F150 Forum - Community of Ford Truck Fans
 
Reply
Old Jul 27, 2015 | 01:50 PM
  #6  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
Originally Posted by Zorfox
You do need to pull the codes. I would also determine why the connectors are disconnected and hook them back up. You don't need a code reader for your truck. You can read the codes by using a jumper and counting the check engine light flashes. I have the same truck and have done it many times. Here is a post that explains how to do that...

How-To: retrieve trouble codes- OBDI - Ford F150 Forum - Community of Ford Truck Fans
ok thank you.ill let you know what comes up
 
Reply
Old Jul 30, 2015 | 09:39 PM
  #7  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
while the engine is running, i unpluged the IAC nothing changes.
plus its hard to start you have to pump the gas for it to start

here is a pic

 
Reply

Trending Topics

Old Jul 31, 2015 | 04:22 PM
  #8  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
well got the code reader today and got these codes
111 with a o 10 and a 111 with a c

said in the book there both system pass
so what dose this mean? vacuum leak?
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

 Verdad Gallardo
story-1

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-2

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-3

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-4

Every 2026 Ford Engine Explained

 Brett Foote
story-5

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-6

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-7

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-8

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-9

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
Old Jul 31, 2015 | 04:33 PM
  #9  
rla2005's Avatar
rla2005
Fleet Owner
20 Year Member
Community Builder
Liked
Community Favorite
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Originally Posted by RadioControlGuy85
while the engine is running, i unpluged the IAC nothing changes.
Take a look at the throttle stop screw. It's not an idle speed adjustment. If someone jacked with it then the base idle can be affected.

If the screw looks to be unmolested then you have a vacuum leak.
 
Reply
Old Jul 31, 2015 | 04:41 PM
  #10  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
Originally Posted by rla2005
Take a look at the throttle stop screw. It's not an idle speed adjustment. If someone jacked with it then the base idle can be affected.

If the screw looks to be unmolested then you have a vacuum leak.
when the truck is cold,and you start it how long should it take for the idle to come down to normal?

i just started it and it took idk 30 or so seconds for it to come down.
 
Reply
Old Jul 31, 2015 | 05:12 PM
  #11  
rla2005's Avatar
rla2005
Fleet Owner
20 Year Member
Community Builder
Liked
Community Favorite
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Originally Posted by RadioControlGuy85

when the truck is cold,and you start it how long should it take for the idle to come down to normal?

i just started it and it took idk 30 or so seconds for it to come down.
Looks about right to me with the last three OBS trucks I have owned.
 
Reply
Old Jul 31, 2015 | 05:17 PM
  #12  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
Originally Posted by rla2005
Looks about right to me with the last three OBS trucks I have owned.
why would it come and go?

and why is it hard to start.
 
Reply
Old Aug 1, 2015 | 03:29 PM
  #13  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
have resetting the computer i drove around for a bit got back to the house and put the code reader on and got these two coded

code 542 is a Fuel Pump Secondary Circuit Failure

code 121 is Closed throttle voltage higher or lower than expected.

the tps has been replace twice that i know of.

so what the heck todo?
 
Reply
Old Aug 1, 2015 | 10:18 PM
  #14  
fordboy97's Avatar
fordboy97
Senior User
Joined: Aug 2014
Posts: 389
Likes: 0
some questions

For the code 121 I'd check the voltage of the tps, make sure its within range. I elongated my tps screw holes with a drill bit to adjust it. This isn't required its just what I did.
 
Reply
Old Aug 1, 2015 | 10:34 PM
  #15  
RadioControlGuy85's Avatar
RadioControlGuy85
Thread Starter
|
Senior User
Joined: Nov 2012
Posts: 381
Likes: 0
Originally Posted by fordboy97
For the code 121 I'd check the voltage of the tps, make sure its within range. I elongated my tps screw holes with a drill bit to adjust it. This isn't required its just what I did.
ok ill do this when i get my meter in.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Fordf1504life
1987 - 1996 F150 & Larger F-Series Trucks
8
Nov 1, 2020 05:50 PM
The White Falcon
1987 - 1996 F150 & Larger F-Series Trucks
9
Jan 5, 2013 11:58 AM
torquemeister
1987 - 1996 F150 & Larger F-Series Trucks
4
Mar 17, 2006 06:35 PM
repman17
1987 - 1996 F150 & Larger F-Series Trucks
1
May 14, 2005 09:23 AM




All times are GMT -5. The time now is 01:59 PM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE