Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 10-07-2001, 08:11 AM
Bojunk Bojunk is offline
New User
 
Join Date: Oct 2001
Posts: 11
Bojunk is starting off with a positive reputation.
85 F150 w/302 EFI dies

Had truck in shop 3 times in last week. Cuts out when it warms up. Have replaced fuel pump twice,fuel cutoff relay,distributor,ICM module.Cap/rotor,wires,plugs recently.
Mech has checked Map sensor,etc.,ignition switch. Says it is losing voltage to fuel pump?
Happens after about 30 minutes of driving
Seen something like it on this board but never gave answer or way to check for it. Also have friend with same motor in a 87 Mustang that does same thing. Common problem?
Reply With Quote
  #2  
Old 10-07-2001, 08:08 PM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 33,325
Franklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant future
85 F150 w/302 EFI dies

[font size="1" color="#FF0000"]LAST EDITED ON 07-Oct-01 AT 08:08 PM (EST)[/font][p]Drive it with a fuel pressure guage tempoarily hooked up and taped to the windshield. You need to decide if it's ignition or fuel problem. Are you getting any error codes from the computer?
__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote
  #3  
Old 10-08-2001, 08:16 AM
Bojunk Bojunk is offline
New User
 
Join Date: Oct 2001
Posts: 11
Bojunk is starting off with a positive reputation.
85 F150 w/302 EFI dies

It gets an error code of 31 although mech says this shouldnt make it cut out
Reply With Quote
  #4  
Old 10-08-2001, 06:07 PM
griffofk griffofk is offline
New User
 
Join Date: Oct 2001
Posts: 2
griffofk is starting off with a positive reputation.
85 F150 w/302 EFI dies

I've been having the same problem with my '86 F150 302 EFI. Cuts out sometimes after 20 - 30 minutes of driving. It's been tuned up, new EGR valve. I have a new ignition module on my seat - I dont't think this is will fix it. When it's dead there's still spark to the plugs so I believe it's not a problem with the ignition.

When it's dead what I've noticed is that when I turn the key (without starting the engine) the fuel pump relay doesn't engage. I've checked the relay it seems to work fine.

I have temporallily bypassed the ECM signals into the fuel pump relay. The switch will allow me to run with the ECM in line to the relay and if the truck dies I can switch the pump 'on' with the ECM out. I made this mod this morning.

I don't know what's wrong. I'm hoping the bypass swicth will keep me from being stuck on the side of the road until I can get some good advice. It's been in the shop twice.

I'd like to know how the ECM functions - under what conditions would the ECM cut off the fuel pumps?

Reply With Quote
  #5  
Old 10-09-2001, 01:15 AM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 33,325
Franklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant future
85 F150 w/302 EFI dies

Bojunk, code 31 is an egr code, and if the egr is screwed up, it can make the engine stall when you come up to a stop light. It shouldn't affect running down the highway too much.

griffofk, My fuel injection book says the PIP signal is the primary input for the control of the fuel pump relay. The fuel pump relay receives power from the keyswitch in the "start" position, but after the key is released, the computer must receive a PIP signal to send power to the relay to keep the pump running. The PIP signal is generated inside the dist. It's a train of pulses that are sent to the TFI module on the side of the dist, and they are also sent to the computer for fuel pump control and injector synchronization.


__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote
  #6  
Old 10-09-2001, 07:09 AM
griffofk griffofk is offline
New User
 
Join Date: Oct 2001
Posts: 2
griffofk is starting off with a positive reputation.
85 F150 w/302 EFI dies

Franklin,

What's the title of your fuel injector book?

Sounds like if I continue to have problems cutting out even with the fuel pump relay bypassed I should trouble shoot the PIP signal. Which I guess takes me through distributor, ignition module, computer?

Thanks for the information.

Frank
Reply With Quote
  #7  
Old 10-09-2001, 09:42 PM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 33,325
Franklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant future
85 F150 w/302 EFI dies

How to Tune and Modify Ford Fuel Injection. I picked it up in the bookstore. I like these kind of 3rd party books because the guy actually talks and explains things, unlike the factory manuals which are good, but never give an explanation of the theory behind what's going on.
__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote
  #8  
Old 10-10-2001, 06:44 AM
Bojunk Bojunk is offline
New User
 
Join Date: Oct 2001
Posts: 11
Bojunk is starting off with a positive reputation.
85 F150 w/302 EFI dies

[font size="1" color="#FF0000"]LAST EDITED ON 10-Oct-01 AT 07:00 AM (EST)[/font][p]Got truck out of shop for 4th time today, changed ICM (2nd time)runs smoother but still stumbles (hasn't died yet). Can hear motor surging when it idles. The weather here (Arizona) has cooled alot so I cant really compare to when problem first appeared, although I dont think it is fixed. Friend with 87 Mustang got new computer drove around all day and had no problems. Think I will try O2 sensor next?, before I try new computer. My dad owned truck before me and says thats only thing he never replaced and it seems like it is cycling (surging) between rich lean rich lean.
Reply With Quote
  #9  
Old 10-10-2001, 10:52 AM
AWGuinn AWGuinn is offline
Freshman User
 
Join Date: Aug 2001
Posts: 35
AWGuinn is starting off with a positive reputation.
85 F150 w/302 EFI dies

Bojunk,
Thanks for the reply to my string. It sounds like we are having the same problem. My truck also surges when idling, and it seems to be cycling between rich and lean also. Try unplugging your air temp sensor. That made my idle smooth right out, and the mixture seems to be good, but the truck has a slight loss of power and will still load up at times. If your truck does the same, then we probably are experiencing the same fault. The only thing I haven't done is replace the computer, which I am going to do next pay day. I'll let you know how it turns out
Reply With Quote
  #10  
Old 10-10-2001, 01:52 PM
lanero lanero is offline
Elder User
 
Join Date: Feb 2000
Location: South Sioux City, NE USA
Posts: 601
lanero is starting off with a positive reputation.
85 F150 w/302 EFI dies

I had the same problem with an 84 F150. Replaced the ICM 3 times, didn't fix it. Turned out to be the Hall Effect sensor in the dist. This is the sensor that takes the place of the points. Replaced mine and never had a problem after that.

Roger Lane
Test Analyst
Sr. Automated Test Engineer

__________________
Roger Lane
Reply With Quote
  #11  
Old 10-10-2001, 02:53 PM
AWGuinn AWGuinn is offline
Freshman User
 
Join Date: Aug 2001
Posts: 35
AWGuinn is starting off with a positive reputation.
85 F150 w/302 EFI dies

If the Hall Effect Sensor is the same as the Stator Assembly, then I have replced it, and it didn't fix the problem. However, when I replaced the stator assembly, it did get rid of the cut-out problem I was having at 2500-3500 rpms.
Reply With Quote
  #12  
Old 10-11-2001, 06:42 AM
Bojunk Bojunk is offline
New User
 
Join Date: Oct 2001
Posts: 11
Bojunk is starting off with a positive reputation.
85 F150 w/302 EFI dies

[font size="1" color="#FF0000"]LAST EDITED ON 11-Oct-01 AT 06:45 AM (EST)[/font][p]I put a new distributor in first, it came with new stator (pickup) coil. This is what I thought the problem was at first,thats what led me to take it to the shop. I thought I had messed up the timing when I did it. I have made it the 15 miles to work and back twice now but still surging. What happened when you replaced O2 sensor? Unfortunately my buddy who replaced the computer got laid off today. We are in the aviation biz. damn shame smartest 19 year old I have ever met. Sharp kid Might still be able to get a hold of him though to see if it fixed his problem
Reply With Quote
  #13  
Old 10-11-2001, 04:15 PM
AWGuinn AWGuinn is offline
Freshman User
 
Join Date: Aug 2001
Posts: 35
AWGuinn is starting off with a positive reputation.
85 F150 w/302 EFI dies

Bojunk,
Check my other thread. I responded on it.
Reply With Quote
  #14  
Old 10-12-2001, 12:40 AM
canadianfordman canadianfordman is offline
Posting Guru
 
Join Date: Dec 2000
Location: Campbell River, BC Canada
Posts: 1,593
canadianfordman is starting off with a positive reputation.
85 F150 w/302 EFI dies

__________________
2007 F350 C/C XLT 6.0 4x4
2005 F150 Super Crew Lariat 4x4
1984 F150 XLT 351w and C6 is Chromed to the Nutz!
Reply With Quote
Old 10-12-2001, 12:40 AM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel pump relay 2004 EX? wikdwest Excursion - King of SUVs 3 08-28-2014 06:53 PM
79 f100 w/302, not getting any fuel to the fuel pump rao316 1973 - 1979 F-100 & Larger F-Series Trucks 5 12-29-2011 12:18 AM
Fuel pump issues mduncan 1987 - 1996 F150 & Larger F-Series Trucks 8 04-18-2011 02:07 PM
2004 f250 have to turn key switch in order to start Marting 2004 - 2008 F150 3 12-08-2010 07:49 PM
Truck has no power to anything but the batteries are good dyoungen 1987 - 1996 F150 & Larger F-Series Trucks 5 12-24-2009 01:18 PM


Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks

Tags
1986, 302, 85, bad, cut, cutting, dies, efi, f150, idle, issues, pip, sensors, stalls, xlt

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 08:46 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
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. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup