Go Back   Ford F150 Forum - Community of Ford Truck Fans > Pre-1997 F150 > 1987 - 1996 F150
Sign in using an external account
Register Forgot Password?


Welcome to F150 Forum!
Welcome to F150 Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, 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 free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 05-13-2009, 10:44 PM   #1
Junior Member
 
Join Date: May 2009
Posts: 6
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default F-150 4.9L Engine will not start No Spark

Followed all the testing in the Haynes manual. Tested the PIP circuit by reading the Volts AC Pip signal. With the PCM connected I have no volts, but with the PCM disconnected I get between 3.5 and 8 VAC per manual. Replaced PCM, ICM and checked all wiring in harness. Still do not get PIP voltage with the PCM connected. Fault code reader does not detect any faults. I have cleaned and checked all grounds. Any ideas what else to check?
Pita7632 is offline   Reply With Quote
Old 05-13-2009, 11:53 PM   #2
We'd do it
 
Just call me Sean's Avatar
 
Join Date: May 2008
Location: Orlando,Fl.
Posts: 31,046
Mentioned: 2 Post(s)
Thanks: 29
Thanked 360 Times in 320 Posts
Feedback Score: 1 reviews
Send a message via Yahoo to Just call me Sean
Default

What year is your truck?
__________________
Quote:
Originally Posted by Early Cuyler
Fights begin, fingerprints are took, days is lost, bail is made, court dates are ignored, cycle is repeated.
Just call me Sean is offline   Reply With Quote
Old 05-14-2009, 08:40 AM   #3
Junior Member
 
Join Date: May 2009
Posts: 6
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default F150 4.9L Engine Will not start No Spark

Truck year is 1993. Sorry to leave that little bit of useful information out.
Pita7632 is offline   Reply With Quote
Old 05-14-2009, 09:00 AM   #4
Junior Member
 
Join Date: May 2009
Posts: 6
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default Additional items completed to troubleshoot this problem

Here is some additional items completed to help troubleshoot. Originally replaced the timing belt to help correct, also replaced distribute and insured timing was accurate. Was able to start it once right after replacing the timing belt, but when I hit the gas pedal the engine died. Checked all starting and ignition circuits per tests in the manual until I got to testing the PIP circuit. When I found there was no voltage at the connector, I commenced to isolate by disconnecting the PCM, where the voltage returned. Assuming it was a bad PCM, I replaced it. Still no voltage when it is connected, but it returns when it is disconnected. Is it possible that maybe I am missing a ground circuit coming of the PCM so it isn't going to ground properly?
Pita7632 is offline   Reply With Quote
Old 05-14-2009, 09:02 AM   #5
LJ1
Junior Member
 
LJ1's Avatar
 
Join Date: May 2009
Location: Omaha, NE
Posts: 18
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

Did it die while driving then wouldnt start or does it just not start?
__________________
F-150 I6 4x4
LJ1 is offline   Reply With Quote
Old 05-14-2009, 09:12 AM   #6
Junior Member
 
Join Date: May 2009
Posts: 6
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

Just would not start. Had an intermittent problem with it prior, let it sit for a year or so and am now trying to rebuild it.
Pita7632 is offline   Reply With Quote
Old 05-14-2009, 12:59 PM   #7
Junior Member
 
Join Date: May 2009
Posts: 6
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default More troubleshooting

Today I went ahead and disconnected the PCM and ICM while reading resistance from the PIP signal wire at the distributer to ground. With everything connected I read .01 Ohms. When I disconnect the PCM and ICM I still read .01 Ohms to ground. When I disconnect the connection to the distributer I get open to ground. Reconnect the PCM and ICM modules I read 17 K ohm to ground. Is it possible the PIP signal is grounded out in the distributer, or am I suppose to be reading to ground when the distributer is connected?
Pita7632 is offline   Reply With Quote
Old 05-14-2009, 09:06 PM   #8
Junior Member
 
Join Date: May 2009
Posts: 6
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default Looks like I found the problem

Looks like the problem was in the connector that connects to the ICM. After playing with that for a little while I was able to get the truck to start 12 consecutive times. I then played with it again and no start. Played one more time and got it running again. Will see if i can check the pins in the connector.
Pita7632 is offline   Reply With Quote
Old 05-14-2009, 09:06 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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine Start Squeal parisq 1987 - 1996 F150 3 10-02-2008 07:42 AM
engine doesn't want to start jlemley 1997 - 2003 Ford F150 4 09-03-2008 07:55 PM
Engine Start Button How-To ReverendJG Aftermarket Products, Reviews & Installation 0 05-20-2008 02:00 PM
Engine Won't Start KROSSF150 2004 - 2008 Ford F150 8 02-01-2008 11:11 PM
All-spark and no start, what gives!? bowesmobile 1987 - 1996 F150 9 02-01-2008 07:27 PM

 

The Mustang Source
All times are GMT -4. The time now is 03:48 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.5.2
Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.