BLown Fuse #18 PCM, fuel injectors, IAC, MAF, fuel pump relay - Ford F150 Forum - Community of Ford Truck Fans



BLown Fuse #18 PCM, fuel injectors, IAC, MAF, fuel pump relay

Reply
 
 
 
Thread Tools Search this Thread
Old 08-03-2014, 09:09 PM   #1
Junior Member
Thread Starter
 
Join Date: Aug 2014
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default BLown Fuse #18 PCM, fuel injectors, IAC, MAF, fuel pump relay

So, I was climbing a gravel mountain road in my 99' F-150 XLT 4.6l 2wd yesterday and the engine suddenly died. Truck would crank but wouldn't start. With the ignition on the theft light was flashing and one of the fuel relays in the junction box under the hood was clicking rapidly.

After a rather embarrassing tug off the mountain from a Chevy, I found that the #18 fuse in the under hood junction box had blown. Replaced the fuse and made it home the rest of the way. Got home and checked the wiring diagram and found fuse 18 powers all the injectors, IAC, MAF, PCM, and the coil side of the fuel pump relay.

Thinking that a wiring problem was more likely than any of those components shorting intermittently I started inspecting the wiring harness and moving it around with the key on and finally found it. Turns out a sharp corner on the driver's side rear of the intake manifold rubbed a hole in the engine harness right below the fuel lines (very center of pics). It looks like the harness is routed where it is supposed to be from factory, all the plastic clips that hold it on are still there, even on the very back of the engine. So at this point I'm beginning to think WTF Ford? Maybe that sharp corner was supposed to be rounded off? Or the harness is actually in the wrong place? Has anyone else here had this happen or heard of it happening or do I just have a freak truck?
Attached Thumbnails
BLown Fuse #18 PCM, fuel injectors, IAC, MAF, fuel pump relay-dsc_2828august-03-2014.jpg   BLown Fuse #18 PCM, fuel injectors, IAC, MAF, fuel pump relay-dsc_2829august-03-2014.jpg  
bigscurrybear is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
F150 1996 Fuel Pumps will not Activate kenw Electrical 3 11-13-2016 10:34 PM
Rough Idle/Misfiring - HELP! (2006 F150 5.4L v8) carp104 2004 - 2008 Ford F150 39 08-09-2016 07:32 PM
Overhead console, map lights on dome light, vanity lights all don't work :( Tasteslikeink 1997 - 2003 Ford F150 15 09-15-2015 09:50 PM
91' F150 351 / Fuel pump relay issue puke22 1987 - 1996 F150 1 09-05-2015 05:02 PM
Hey everyone Brandyn193 Introductions 1 09-04-2015 05:06 PM


Tags
cranks but won't start, ecu fuse, fuse #18, no start, wiring harness

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:55 PM.


Copyright 2006 - 2016 F150Forum.com