7.3 engine missing on #4 - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 01-10-2019, 07:29 PM Thread Starter
Junior Member
 
Join Date: Jan 2019
Posts: 6
My Photos: (0)
Feedback Score: 0 reviews
7.3 engine missing on #4

I have a 2002 f250 7.3 have a miss on cylinder 4 passes buzz test but not contribution test replaced injector same problem did compression test cold #2,355psi #4,350psi #6,350psi #8,355 on a 40 degree day at sea level I moved the new injector 4 to hole #2 and vice versa could bad uvch harness pass a buzz test but still not run correctly

Last edited by Lastminute76; 01-10-2019 at 07:57 PM.
Lastminute76 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 01-10-2019, 09:19 PM
Lifetime Supporting Member
 
klhansen's Avatar
 
Join Date: Jan 2003
Location: Eagle River, Alaska
Posts: 24,547
My Photos: (180)
Feedback Score: 0 reviews
The buzz test only checks that the solenoid opens and closes the pintle valve in the injector. It could have plugged internal passages and not be getting any fuel.

Did the CCT failure move to #2 cylinder with the injector?

The buzz test will buzz all the injectors, but listening to the sound will help diagnose issues. A weak buzz might indicate a non-functional injector.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
), AIS,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
regulated return,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
klhansen is offline  
post #3 of 8 (permalink) Old 01-11-2019, 02:11 AM
Senior Member
 
Absolute's Avatar
 
Join Date: Jul 2009
Location: Vancouver, BC, Canada
Posts: 979
My Photos: (0)
Feedback Score: 0 reviews
To answer your question, yes the UVCH harness can pass the test broken. Most those breaks are intermittent and could be working during testing. Usually start failing when it warms up and wires expand. That's why they can be a Pita to trace. I too am curious if the failure moved with the injector to #2, or stayed on 4. If it stayed on , the harness is a good place to start. If the wires are brittle, there probably needing replacement. Good sign there wore out.

2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD, Complete rebuild .010 over by myself except balancing, 2000hp billet connecting rods, ARP main and head studs, ceramic coated pistons, Smith Bros Chrome Molly push rods, Comp Cams springs, shims and seals. Competion complete valve set and head grinding and vacuum tested, Adrenaline HPOP, DP Tuner Infinity DX programmer and full load of tunes modified for my new Stage 3 250 shot injectors, ceramic coated exhaust manifolds and up pipes and collector, BD Diesel triple clutch furnace brazed billet torque converter and BD pro engine brake and compressor set up, MBRP 4" stainless turbo back, Driven Diesel regulated fuel return system, AFE pro stage 2 cool air intake, riffraff billet Whicked Wheel 2 compressor wheel in a GTP38R turbo, riffraff blue cooler boot kit and coil clamps, International Double Ceramic Coated Bellowed Up Pipes
1999 Mustang GT Convertible Anniversary, rare stock electric green
2009 40' Raptor Velocity Toy Hauler
Absolute is offline  
Sponsored Links
Advertisement
 
post #4 of 8 (permalink) Old 01-11-2019, 04:33 AM Thread Starter
Junior Member
 
Join Date: Jan 2019
Posts: 6
My Photos: (0)
Feedback Score: 0 reviews
No the cct failure did not move to #2 it still failed #4
Lastminute76 is offline  
post #5 of 8 (permalink) Old 01-11-2019, 04:45 AM Thread Starter
Junior Member
 
Join Date: Jan 2019
Posts: 6
My Photos: (0)
Feedback Score: 0 reviews
Truck has 218k miles on it
Lastminute76 is offline  
post #6 of 8 (permalink) Old 01-11-2019, 10:40 AM
Senior Member
 
Absolute's Avatar
 
Join Date: Jul 2009
Location: Vancouver, BC, Canada
Posts: 979
My Photos: (0)
Feedback Score: 0 reviews
Pointing to the harness, but what was the code for 4 when it failed? You could swap the harnesses from side to side to see if the failure follows the harness. That would at least tell you if its the harness. Bit of work , but a solid test.

2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD, Complete rebuild .010 over by myself except balancing, 2000hp billet connecting rods, ARP main and head studs, ceramic coated pistons, Smith Bros Chrome Molly push rods, Comp Cams springs, shims and seals. Competion complete valve set and head grinding and vacuum tested, Adrenaline HPOP, DP Tuner Infinity DX programmer and full load of tunes modified for my new Stage 3 250 shot injectors, ceramic coated exhaust manifolds and up pipes and collector, BD Diesel triple clutch furnace brazed billet torque converter and BD pro engine brake and compressor set up, MBRP 4" stainless turbo back, Driven Diesel regulated fuel return system, AFE pro stage 2 cool air intake, riffraff billet Whicked Wheel 2 compressor wheel in a GTP38R turbo, riffraff blue cooler boot kit and coil clamps, International Double Ceramic Coated Bellowed Up Pipes
1999 Mustang GT Convertible Anniversary, rare stock electric green
2009 40' Raptor Velocity Toy Hauler
Absolute is offline  
post #7 of 8 (permalink) Old 01-11-2019, 11:14 AM Thread Starter
Junior Member
 
Join Date: Jan 2019
Posts: 6
My Photos: (0)
Feedback Score: 0 reviews
Truck had interment miss did contribute test came up with #4 failed cct and mis was getting worse so I replaced injector
Lastminute76 is offline  
post #8 of 8 (permalink) Old 01-11-2019, 01:40 PM
Lifetime Supporting Member
 
klhansen's Avatar
 
Join Date: Jan 2003
Location: Eagle River, Alaska
Posts: 24,547
My Photos: (180)
Feedback Score: 0 reviews
Replacing UVCH's is good insurance whenever you have to open the valve covers. They cost a lot less than even 1 injector. ~$25-30 each if bought thru RockAuto. Same for glow plugs. How many times do you want to R&R the valve covers.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
), AIS,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
regulated return,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
klhansen is offline  
Sponsored Links
Advertisement
 
Reply

  Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > '99 & up 7.3L Power Stroke Engine and Drivetrain

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Forum - TheDieselStop.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome