Trouble shooting injector issue
Thread Starter
|
Freshman User
Joined: Sep 2003
Posts: 29
Likes: 0
Trouble shooting injector issue
2003 F250 7.3
I have an intermitent issue with #3 injector. Checking at the VC connector it shows as shorted most of the time. Intermitently it shows OK. This morning it started fine on all 8. 2 hours later it started but sounds like its running on 7 again and has a miss.
My AE package is not here yet but I'm not sure it would tell me anything other than there is an issue with #3.
So I can check ohms on the solenoid but that is a passive test and may not show bad. Should I just go with a new to see if that takes care of it or is there a way to definatively test a solenoid?
I have an intermitent issue with #3 injector. Checking at the VC connector it shows as shorted most of the time. Intermitently it shows OK. This morning it started fine on all 8. 2 hours later it started but sounds like its running on 7 again and has a miss.
My AE package is not here yet but I'm not sure it would tell me anything other than there is an issue with #3.
So I can check ohms on the solenoid but that is a passive test and may not show bad. Should I just go with a new to see if that takes care of it or is there a way to definatively test a solenoid?
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
If you show a true short on any solenoid wire, change out the UVCH ad VC gasket right quick. Make sure it is a short and not an open that you are referring to. Each solenoid should read about 2.9 ohms. There are aftermarket harnesses/gaskets that are allegedly compatable, but there are horror stories about the Dorman products being wired incorrectly. The OEM products are the safest... Riffraff carries them for a reasonable price.
When you check the conductivity, probe the ends... do not pierce the insulation. If you have a short and don't fix it quick, this can take out the IDM.
When you check the conductivity, probe the ends... do not pierce the insulation. If you have a short and don't fix it quick, this can take out the IDM.
Thread Starter
|
Freshman User
Joined: Sep 2003
Posts: 29
Likes: 0
The connections for #3 at the VC check 1.4 - 1.5 ohms, if I short the meter probes together I get 1.2. So I expect I have a short.
VC and UVCH are 2 months old from NAPA. Don't recall if they were Dorman.
The intermittent issue is what throws me. I would think a short would stay shorted....
VC and UVCH are 2 months old from NAPA. Don't recall if they were Dorman.
The intermittent issue is what throws me. I would think a short would stay shorted....
Posting Guru
Joined: Sep 2010
Posts: 1,329
Likes: 0
From: Grand Bay, Al
not always true. i have a speaker cutting in and out. i know its not an injector but the rca wires have a short and its on and off
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Check the meter setting and the battery.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I've seen this before, I had to pull my meter apart and re-solder the connections to my lead jacks (on a Fluke meter). You may need new leads, but get the reading real low... like 0 to 0.2 when you short your leads. You can't trust your meter until this is resolved, but I wouldn't risk your IDM until you're sure.
I touch the end of the contacts on the 42-pin connector over the driver-side VC (do not insert probe into connections).
I touch the end of the contacts on the 42-pin connector over the driver-side VC (do not insert probe into connections).
Thread Starter
|
Freshman User
Joined: Sep 2003
Posts: 29
Likes: 0
Got new meter. Was able to zero ohm reading. Checked #3 and got .2-.4 so definitely shorted.
Pulled VC and when I disconnected the harness at the injector the reading went to open. So either there is some kind of fault in the connector at the injector or something else is causing it.
Put in new OEM gasket and harness. Definite difference in quality between the old harness that I got from NAPA and the OEM. OEM connector at the gasket is much beefier and robust. Connector at the injector looks similar but the OEM is a 1/16 inch or so longer than NAPA.
Truck back to running normally so far. Will hold final judgment until I’ve got some miles in.
New IH black CPS should arrive today, will be interesting to see if I can tell any difference in how it runs over using the Ford grey one.
Pulled VC and when I disconnected the harness at the injector the reading went to open. So either there is some kind of fault in the connector at the injector or something else is causing it.
Put in new OEM gasket and harness. Definite difference in quality between the old harness that I got from NAPA and the OEM. OEM connector at the gasket is much beefier and robust. Connector at the injector looks similar but the OEM is a 1/16 inch or so longer than NAPA.
Truck back to running normally so far. Will hold final judgment until I’ve got some miles in.
New IH black CPS should arrive today, will be interesting to see if I can tell any difference in how it runs over using the Ford grey one.
Trending Topics
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Put in new OEM gasket and harness. Definite difference in quality between the old harness that I got from NAPA and the OEM. OEM connector at the gasket is much beefier and robust. Connector at the injector looks similar but the OEM is a 1/16 inch or so longer than NAPA.
Truck back to running normally so far. Will hold final judgment until I’ve got some miles in.
New IH black CPS should arrive today, will be interesting to see if I can tell any difference in how it runs over using the Ford grey one.
Truck back to running normally so far. Will hold final judgment until I’ve got some miles in.
New IH black CPS should arrive today, will be interesting to see if I can tell any difference in how it runs over using the Ford grey one.
Good Job!! The black one idles a little smoother... I recently went from grey to black.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Where did you get the black CPS? Do you have a link.
Thread Starter
|
Freshman User
Joined: Sep 2003
Posts: 29
Likes: 0
I got it from Pure Diesel Power.
Improved CPS Cam Position Sensor 7.3L Ford Powerstroke Diesel 1876736C91
Improved CPS Cam Position Sensor 7.3L Ford Powerstroke Diesel 1876736C91
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
I got it from Pure Diesel Power.
Improved CPS Cam Position Sensor 7.3L Ford Powerstroke Diesel 1876736C91
Improved CPS Cam Position Sensor 7.3L Ford Powerstroke Diesel 1876736C91
Just so you know it is described as "Improved International CPS" and the part number 1876736C91 does not match
that of the original black CPS. They don't even mention what color it is, just a picture that suggests it is black.
Original Black CPS:
Thread
Thread Starter
Forum
Replies
Last Post
Tugly
1999 - 2003 7.3L Power Stroke Diesel
11
Dec 6, 2012 07:37 PM
Shade
1999 - 2003 7.3L Power Stroke Diesel
14
Dec 2, 2012 08:07 AM
Tugly
1999 - 2003 7.3L Power Stroke Diesel
23
Nov 9, 2012 07:03 PM
ToMang07
1999 - 2003 7.3L Power Stroke Diesel
6
May 29, 2011 10:43 PM