F150 Questions - 2003-04 Mach 1 Registry Owners Club

Mach351 · 11-30-2015, 10:50 AM

i've got an '02 F150 SCrew with a 4.6 that has broken the 200K mile barrier.
just recently, it has started getting temperamental about starting when the engine is at 'operating temperature' - as in it fires right up when the engine is cold, but will not start after being driven for a while then stopping; like for gas or food.

relating back to the ancient times of carburetors, it acts like it is vapor locked where it wants to start but just doesn't fire up.

there are no trouble codes in the ECU, so i'm a little lost where to start trouble-shooting.

i've seen some folks here mention F150 forums. i've looked on a few to diagnose other issues but not a member on any. if there's a good one someone wants to recommend, i would be appreciative.

cheers!

badass4.6 · 12-01-2015, 07:46 AM

honestly man im lost with you on that on. my dads 86 F150 would start up great cold but after drove for a hourish and stop for food or gas like you mention this thing would barely turn over like the battery was about dead and then fire up. battery and alt always checked out fine it done it for years so we let it go lol

Mustanger2 · 12-03-2015, 11:19 PM

It could be the TFI module...I had trouble with those in an 88 & an 89 when they got too much heat they just shut down & after 20-30 minutes they cooled & you could start again....Shows nothing wrong ever....we fixed the 88 & 89 by relocating the module to the firewal & on a heat sink....the 02 should already be relocated but still could be faulty due to age.

2k4mach · 12-04-2015, 06:44 PM

Quote:

Originally Posted by Mustanger2

It could be the TFI module...I had trouble with those in an 88 & an 89 when they got too much heat they just shut down & after 20-30 minutes they cooled & you could start again....Shows nothing wrong ever....we fixed the 88 & 89 by relocating the module to the firewal & on a heat sink....the 02 should already be relocated but still could be faulty due to age.

no tfi module on an 02.

WalkrTexasRngr · 12-04-2015, 08:14 PM

Im a member over at www.f150forum.com
with my 2011 f150. Seems like a helpful group. There is also a facebook group called f150 parts for sale or something like that that is also really helpful with questions that ive seen.

TKat13 · 12-04-2015, 09:23 PM

is that motor basically the same that is in an 04 GT? Could your cops be breaking down and heat just not allowing spark? If it is the same as the GT, I have some extra cops you can try. Although a long shot.

Cumbersome101 · 12-05-2015, 07:53 AM

Check and see if you are getting fuel. Then see if you are getting spark. Those are two very simple things to check. It sounds like a PCM issue. You need to go to a diagnostic shop so the can watch the parameters and see what's not turning back on. Bite the bullet and pay the $100 bucks because u are going to be throwing parts at it if u don't

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03mach1 · 12-05-2015, 06:16 PM

Could be fuel pressure, fuel filter, a temp sensor, weird theres no codes.
I have a 2004 F150 with the 5.4L and it's never had a problem, the pass. side exhaust manifold leaks a bit until it warms up, and the steering sticks a bit. but it's been a good truck.

Mustanger2 · 12-05-2015, 11:51 PM

LOL...Well THAT is one problem eliminated! Sorry That is my newest vehicle....carry on.

11-30-2015, 10:50 AM	#1
Mach351 Psycho Dog is Psycho Join Date: Sep 2008 Location: Lewisville, TX Posts: 1,990	F150 Questions i've got an '02 F150 SCrew with a 4.6 that has broken the 200K mile barrier. just recently, it has started getting temperamental about starting when the engine is at 'operating temperature' - as in it fires right up when the engine is cold, but will not start after being driven for a while then stopping; like for gas or food. relating back to the ancient times of carburetors, it acts like it is vapor locked where it wants to start but just doesn't fire up. there are no trouble codes in the ECU, so i'm a little lost where to start trouble-shooting. i've seen some folks here mention F150 forums. i've looked on a few to diagnose other issues but not a member on any. if there's a good one someone wants to recommend, i would be appreciative. cheers! __________________ Firefly: opening scene of Serenity - This Land Firefly: Out of Gas - Don't Be Afraid

12-01-2015, 07:46 AM	#2
badass4.6 Registered User Join Date: Sep 2010 Location: port saint joe, florida Posts: 415	Re: F150 Questions honestly man im lost with you on that on. my dads 86 F150 would start up great cold but after drove for a hourish and stop for food or gas like you mention this thing would barely turn over like the battery was about dead and then fire up. battery and alt always checked out fine it done it for years so we let it go lol __________________ http://i170.photobucket.com/albums/u...CN1214-1-1.jpg

12-03-2015, 11:19 PM	#3
Mustanger2 Registered User Join Date: Jan 2004 Location: Grants Pass, Oregon Posts: 1,777	Re: F150 Questions It could be the TFI module...I had trouble with those in an 88 & an 89 when they got too much heat they just shut down & after 20-30 minutes they cooled & you could start again....Shows nothing wrong ever....we fixed the 88 & 89 by relocating the module to the firewal & on a heat sink....the 02 should already be relocated but still could be faulty due to age. __________________ I drive a slow Mustang....but I drive it Slow....HARD!

12-04-2015, 08:14 PM	#5
WalkrTexasRngr 2003 AB Mach 1 Join Date: Jul 2011 Location: SW Pennsylvania Posts: 872	Re: F150 Questions Im a member over at www.f150forum.com with my 2011 f150. Seems like a helpful group. There is also a facebook group called f150 parts for sale or something like that that is also really helpful with questions that ive seen.

12-04-2015, 09:23 PM	#6
TKat13 Mach-T Join Date: Jun 2004 Location: DFW Posts: 2,865	Re: F150 Questions is that motor basically the same that is in an 04 GT? Could your cops be breaking down and heat just not allowing spark? If it is the same as the GT, I have some extra cops you can try. Although a long shot. __________________ Darrell Black '04 Mach 1 Track Times (bone-stock w/drs):60 ft - 1.90 \| 1/8 - 8.67 (100 shot,E85,4:10s,Street tire):60 ft - 1.67 \| 1/8 - 7.88 New build - 750rwhp; not track tested (yet) Mods: Build Log Paint&Body Tuned by Manny @ HPP

12-05-2015, 07:53 AM	#7
Cumbersome101 Registered User Join Date: Oct 2015 Location: Hot springs arkansas Posts: 362	Check and see if you are getting fuel. Then see if you are getting spark. Those are two very simple things to check. It sounds like a PCM issue. You need to go to a diagnostic shop so the can watch the parameters and see what's not turning back on. Bite the bullet and pay the $100 bucks because u are going to be throwing parts at it if u don't Sent from my iPhone using Tapatalk

12-05-2015, 06:16 PM	#8
03mach1 Admin/Founder Join Date: Aug 2002 Location: Cuba, NY Posts: 6,805	Re: F150 Questions Could be fuel pressure, fuel filter, a temp sensor, weird theres no codes. I have a 2004 F150 with the 5.4L and it's never had a problem, the pass. side exhaust manifold leaks a bit until it warms up, and the steering sticks a bit. but it's been a good truck. __________________ David J. Wagner Founder/Admin Member #0001 http://www.Mach1Registry.com http://www.Mach1Performance.org Amsoil T-1 Certified Independant Dealer Member, MCA '03 Mach 1, '08 V6 WIP, 76 Cobra II VIN#301788

12-05-2015, 11:51 PM	#9
Mustanger2 Registered User Join Date: Jan 2004 Location: Grants Pass, Oregon Posts: 1,777	Re: F150 Questions LOL...Well THAT is one problem eliminated! Sorry That is my newest vehicle....carry on. __________________ I drive a slow Mustang....but I drive it Slow....HARD!

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