Engine Builders talk.
98 F150 5.4L E40D/4R100
Joined: Nov 2006
Posts: 28,533
Likes: 7,638
From: MI
Right now, I don't think so, I think it's under the dash.
BUT,- The 98's have a MAXI in the PDB in the engine compartment that ties ignition to GEM from what I recall. Sometimes they can blow. Not totally sure on the repercussions, -I'll have a looksee.
BUT,- The 98's have a MAXI in the PDB in the engine compartment that ties ignition to GEM from what I recall. Sometimes they can blow. Not totally sure on the repercussions, -I'll have a looksee.
Last edited by Jbrew; Jan 13, 2015 at 11:32 PM.
98 F150 5.4L E40D/4R100
Joined: Nov 2006
Posts: 28,533
Likes: 7,638
From: MI
I believe that may be the fuse I'm referring to in my last post. I must have edited while you were writing your post. 4WD/GEM. Not sure on anything yet tho.
98 F150 5.4L E40D/4R100
Joined: Nov 2006
Posts: 28,533
Likes: 7,638
From: MI
Worse case scenario would be frying/hurting the PCM. Since I was welding on both engine and frame recently. But I'm 99% sure all ties were disconnected before doing so. However,I didn't pull the fuses..perhaps I should have. I'll check it out tomorrow.
Senior Member
Joined: May 2009
Posts: 2,926
Likes: 144
From: Tallahassee, Fl
Went to move the truck out of the garage and it went into "limp mode" or "fail safe mode" , can't recall which it is but #4, #5,#6 and #8 read misfire.
Haven't had a a chance to look at it yet, from what I recall, I either blew fuse #25/35, -or the trans is too low...iduno, the over drive switch isn't blinking, BUT the airbag light remains illuminate. Haven't looked for trans codes. So, those are all just guesses thus far. It may be all of the above lol.
EDIT: Oh, both doors are removed, but I'm not sure that has anything to do with it. This vehicle doesn't share the PATS like the 99 150's or 98 Nav's and Expy's, so no blinking lights or gauge sweeps.
I think that's all I noticed or came to mind troubleshooting for about 10 minutes lol.
Guess I'll look around on the net,since I have a little time; - perhaps my owners for the fuse directory, - to confirm the correct fuse to pull for now.
Haven't had a a chance to look at it yet, from what I recall, I either blew fuse #25/35, -or the trans is too low...iduno, the over drive switch isn't blinking, BUT the airbag light remains illuminate. Haven't looked for trans codes. So, those are all just guesses thus far. It may be all of the above lol.
EDIT: Oh, both doors are removed, but I'm not sure that has anything to do with it. This vehicle doesn't share the PATS like the 99 150's or 98 Nav's and Expy's, so no blinking lights or gauge sweeps.
I think that's all I noticed or came to mind troubleshooting for about 10 minutes lol.
Guess I'll look around on the net,since I have a little time; - perhaps my owners for the fuse directory, - to confirm the correct fuse to pull for now.
Senior Member
Joined: May 2011
Posts: 10,731
Likes: 172
For those who have experience in gear swaps, what's best way to go about the front diff? Drop it completely or leave it in. Also would you take the time to rebuild it? Making a parts list for a 4:10 swap coming up and debating on whether to do just gears or go all out and rebuild the front/rear and replace the junk LS with an auburn diff. A friend will also be doing the work mainly.
98 F150 5.4L E40D/4R100
Joined: Nov 2006
Posts: 28,533
Likes: 7,638
From: MI
@Jbrew have you checked your coolant level? My old 97 would go into limp mode when it was low. Worth checking out anyways.
98 F150 5.4L E40D/4R100
Joined: Nov 2006
Posts: 28,533
Likes: 7,638
From: MI
Senior Member
Joined: May 2009
Posts: 2,926
Likes: 144
From: Tallahassee, Fl
For those who have experience in gear swaps, what's best way to go about the front diff? Drop it completely or leave it in. Also would you take the time to rebuild it? Making a parts list for a 4:10 swap coming up and debating on whether to do just gears or go all out and rebuild the front/rear and replace the junk LS with an auburn diff. A friend will also be doing the work mainly.