1995-1997 7.3 help please

Reply Subscribe

Thread Tools

Search this Thread

Jan 28, 2016 | 08:44 AM

GTAYLORGTS350

Thread Starter

New User

Joined: Jan 2016

Posts: 7

Likes: 0

1995-1997 7.3 help please

Hello all,
I am restoring a 97 f350 and have been swapping many parts/components.

So, this is what I idid and this/these are my issues I need help with.

Thanks in advance

engine 1995
engine wire harness 1997
cab 1997 (automatic)
engine compartment harness 1997
pcm (1995 manual)

issues:
starts, and idles only
no throttle at all
cel on
blows fuse #3 (wiper) instantly

My research shows all harness are identical however
I found that there is a difference at he wiring in the plug that goes to the transmission (manual)
also found a small difference in the connector at the icp

Anyone?

Jan 28, 2016 | 08:56 AM

Hussler

Postmaster

Joined: Sep 2007

Posts: 4,195

Likes: 6

From: Medford Oregon

If you have a CEL and no throttle then look at the IVS (idle validation switch). It's on the throttle assembly with a two wire plug.

Jan 28, 2016 | 09:55 AM

GTAYLORGTS350

Thread Starter

New User

Joined: Jan 2016

Posts: 7

Likes: 0

Hi Jim,
The switch appears to be functioning. I have swapped the pedal with 2 others from running trucks

Jan 28, 2016 | 09:58 AM

oldbird1965

Fleet Owner

Joined: Aug 2004

Posts: 20,419

Likes: 197

From: AZ

PCM manual looking for a auto?

Jan 28, 2016 | 10:31 AM

Hussler

Postmaster

Joined: Sep 2007

Posts: 4,195

Likes: 6

From: Medford Oregon

Fuse #3 (3 Amp) supplies power to the IVS. If it is blowing then the IVS won't work. If that's the case look for wiring shorts to ground. Fuse #2 is the fuse that protects the wiper system and is a 30 Amp.

Jan 28, 2016 | 01:20 PM

GTAYLORGTS350

Thread Starter

New User

Joined: Jan 2016

Posts: 7

Likes: 0

Sorry, it is fuse #2 the 30a wiper

Jan 28, 2016 | 01:23 PM

GTAYLORGTS350

Thread Starter

New User

Joined: Jan 2016

Posts: 7

Likes: 0

Quote:

Originally Posted by oldbird1965

PCM manual looking for a auto?

it has a manual pcm. (known good) however a 1995
I tried a known good 1997 pcm from an auto. it starts but hunts (romps three times before idle settles down.
still no throttle

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

Brett Foote

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Michael S. Palmer

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Brett Foote

Jan 31, 2016 | 05:26 PM

GTAYLORGTS350

Thread Starter

New User

Joined: Jan 2016

Posts: 7

Likes: 0

1995-1997 ENGINE BAY WIRE HARNESS DIFFERENCES

HELLO,
I was having an issue with a 7.3 that would run, but no throttle.
I searched high and low to find out if there were any wiring harness differences between 95 and 97. and everywhere says they are all the same

WELL THEY ARE NOT!!!!

here is what I found after many hours doing pin tp pin etc.

what I had :
1997 cab
1995 engine
1997 engine harness
1995 pcm
1995 idm

With a 1994.5 eng compartment harness
- no start with key
- idle only/no throttle
- long cranking to start
- cel on
(note harness plug has visably less wires)

With a 1995 eng compartment harness
- starts with key
- long start time
- idle only no throttle
- cel on
- blows #2 wiper (30a) when key is turned on

With a 1997 eng harness
- stars quick
- no cel on
-throttle works

So ...I hope this will help someone sometime

with