Notices
1999 - 2003 7.3L Power Stroke Diesel  
Sponsored by:
Sponsored by: DP Tuner

No start P1668 P1670

Thread Tools
 
Search this Thread
 
Old Feb 10, 2025 | 05:09 PM
  #1  
01_ex's Avatar
01_ex
Thread Starter
|
Trailering
Liked
Joined: Nov 2023
Posts: 21
Likes: 7
From: Tennessee
No start P1668 P1670

Finished up a 6" suspension lift on my Ex and went to start it, truck fired up and idled for about 20 seconds and died, started again and lasted about 10 seconds, then 2 seconds, now just cranks. Checked ICP and IPR using torque pro and both are good, RPMs show about 200ish when cranking so I am assuming CPS is good, removed TS chip to rule it out, fuel bowl fills with fuel. Finally got it to throw codes P1668 and P1670 by doing the on demand test, no buzz when doing buzz test. Checked fuses and IDM relay, pulled IDM and did pinpoint test shown on this link:
https://www.ford-trucks.com/forums/a...9&d=1392748502
Findings of pinpoint test
Pin 22 - 12.4 ohms
Pin 7 - 4.8 ohms
Pin 19 - 3.0 ohms
Pin 9 - 2.5 ohms
Pin 6 - 3.0 ohms
Pin 21 - 3.0 ohms
Pin 8 - 30.4 ohms
Pin 20 - 6.1 ohms
Pin 26 to negative post - 0.0 ohms
So, I am not quite sure where to go from here or what to do with this information, I know 2 in each bank are out of spec, but what would the next step be?
 
Reply
Old Feb 17, 2025 | 01:14 PM
  #2  
01_ex's Avatar
01_ex
Thread Starter
|
Trailering
Liked
Joined: Nov 2023
Posts: 21
Likes: 7
From: Tennessee
In case anyone views this thread in the future, would not start due to IDM failure, high resistance was due to UVCH.
Replaced both and truck runs good as new
 
Reply
Old Feb 17, 2025 | 03:48 PM
  #3  
udsuth78's Avatar
udsuth78
Lead Driver
20 Year Member
Liked
Loved
Community Favorite
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Thanks for the follow up and glad you got her squared.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
N.demo7.3
1999 - 2003 7.3L Power Stroke Diesel
3
Mar 12, 2021 01:05 AM
Usmc6.0
6.0L Power Stroke Diesel
2
May 31, 2017 01:22 PM
bbender85
6.0L Power Stroke Diesel
13
Oct 8, 2013 05:10 PM
mx930
6.0L Power Stroke Diesel
8
Feb 6, 2013 07:13 PM
Mercx
1999 - 2003 7.3L Power Stroke Diesel
1
Jul 28, 2007 07:57 AM




All times are GMT -5. The time now is 02:14 AM.

story-0
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-1
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-2
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-3
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-4
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-5
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-6
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-7
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-8
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-9
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE